Professional Partner for Measure &amp; Control

Extended reading: Radar Water Level Sensor Applied To River/Reservoir Monitoring

A water level controller is a device that manages water levels on a variety of systems such as water tanks, pumps and swimming pools. The basic function of a water level controller is to regulate water flow and optimize system performance.

The water level controller is an instrument that can help users solve the waste of water resources. It can efficiently and timely solve the water cutoff and overflow conditions. More importantly, it can solve the problem of artificial water level control for users and realize automatic water level control.

The main functions of the water level controller are as follows:

The display mode of the instrument: it has the functions of -1999~9999 measured value display and set value display, and can also display the working status of the light-emitting diode;
Control mode: 1-4 limit control can be selected, LED indication. The control method is relay ON/OFF; with hysteresis (can be freely set by the user), the control accuracy is ±1 word, and the contact capacity: AC220V/3A, DC24V/6A resistive load.
With alarm function: 1-4 limit alarm can be selected, LED indication. The alarm mode is relay ON/OFF; with hysteresis (user can freely set) alarm accuracy ±1 word, contact capacity: AC220V/3A, DC24V/6A resistive load.
It can monitor the change of water level, according to the set upper and lower limit values of water level and water level alarm value, it can automatically control the opening and closing of the water pump, and can output external alarm signals, which is convenient for users to take timely measures to deal with it.
The instrument consists of three parts: sensor, transmitter and receiver. One transmitter can be configured with multiple receivers, and several receivers monitor the water level of the same water tower and pool at different locations. Provide users with more accurate water level information.

The water level controller has the characteristics of compact structure, economy, reliability, practicality, energy saving and consumption reduction. It is a new type of automatic control device worthy of promotion.

Extended reading: Float Switch Water Level Controller

The function of the liquid level sensor is to detect the liquid level. The liquid level sensor is widely used in electrical appliances and industrial equipment that require water level control. The liquid level sensor can realize the function of water shortage protection.

Principle of water level sensor:
The water level sensor has a sensor. Transform the sensed water level signal into a current signal.

There are many types of water level sensors, so their specific measurement principles are different.
If you need to learn more. You can refer to:
Differential pressure type liquid level measuring instrument;
Float level measuring instrument;
Electric liquid level measuring instrument;
Ultrasonic liquid level measuring instrument;
Radar liquid level measuring instruments, etc.

Extended reading: Capacitive water level sensor

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Sino-Inst offers over 20 Water Tank Level Sensors for Water Level Control.

About 50% of these are liquid level meters, 40% is the tank level sensor.

A wide variety of Water Tank Level Sensors options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of level measurement instrumentation, located in China.

Request a Quote

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Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

Choose the Right Float Switch for Water Tank

Posted on January 24, 2022 by KimGuo11

Float Switch for Water Tank is a switch that can adjust the liquid level status of water tanks, buckets, pools and other fields. It can also be used to control and protect the motor of submersible pumps. The float level switch has the advantages of automatic adjustment, easy installation, reliable quality, stable operation, non-toxic and pollution-free, and affordable price. Therefore, it is widely used in homes, factories, mines and other places.

RFQ More Level Sensors

What Is a Float Switch?

Level switches can be electronic or mechanical. But it serves only one purpose – to alert you if it detects the presence of a product. so that you can act on this alert. A float switch is the switch that does this while floating on water or other liquid in the tank.

The float level switch is operated by magnetic force, without mechanical connection parts, and the operation is simple and reliable. When the float switch is measured medium floating float. The float drives the main body to move. At the same time the magnet on the other end of the float will control the magnet on the switch action lever.

Besides Float Switch, Submersible Level Transducer is also the First Choice for water level measurement and control.

How Does a Float Switch Work?

Use the magnetic float of the float level switch to rise or fall with the liquid level. Activate the reed switch chip at the set position in the sensor detection tube. Sends a contact open (close) switching signal.

One or more reed switches are installed in a closed non-magnetically conductive tube. This tube is then passed through one or more hollow float balls with a ring magnet inside. The rise or fall of the liquid will drive the float to move up and down together. Thereby, the reed switch in the non-magnetically conductive tube can be pulled in or disconnected. to output a switch signal

The Advantages of a Float Switch

Technical advantages of float level switch: The float switch does not contain bellows, springs, seals and other components that cause failures. Instead, a straight float is used to drive the internal magnet of the switch, and the simple lever of the float switch makes the switch act instantly. The float cantilever angle limit design prevents the float from being vertical.

The float level switch is a simple structure, easy to use, safe and reliable level controller. It is faster than the general mechanical switch and has a long working life. Compared with electronic switches, it has the characteristics of strong resistance to load shock, and one product can realize multi-point control. It has been widely used in shipbuilding, papermaking, printing, generator equipment, petrochemical industry, food industry, water treatment, electrician, dye industry, hydraulic machinery and so on.

The float switch is a liquid level control device with simple structure, convenient use, safety and reliability. It has smaller volume, faster speed and longer service life than general mechanical switches. Compared with electronic switches, it has the characteristics of strong resistance to load shock.

Extended reading: Water Tank Level Controller

Types of Float Switches

The flat float level switch is designed using the principles of gravity and buoyancy. The structure is simple and reasonable, mainly including a floating body. A large-capacity micro switch set in the floating body and a driving mechanism that can turn the switch on and off, as well as a connected three-conductor cable.

The distinctive feature of this product is stable and reliable performance. It does not cause malfunction due to the fluctuation of liquid level. At the same time, it also has the characteristics of non-toxicity, corrosion resistance, convenient installation, low price and long service life. This product can be matched with various liquid pumps. It is widely used in water supply, drainage and liquid level automatic control of corrosive liquids.

Mercury float level switch is completely sealed, excellent waterproof, most suitable for water level control of sewage and thick liquids, sewage pools, etc.

Sphere material: ABS, with mercury switch inside.

Cable length: 5M, 10M or can be customized as required.

The mercury switch of the controller is completely installed in the floating ball shell. It is not affected by sewage and debris, and does not cause malfunction. The electrode rod is easily affected by external sewage and debris and has a malfunction. Each unit of the float mercury switch Independent control can cooperate with electrode type liquid level controllers of various brands. It can be controlled by various methods such as drainage and over-water level alarm.

Reed switch float level switch is a simple structure, easy to use, safe and reliable level controller, it is smaller than the general mechanical switch. Compared with electronic switches, it has the characteristics of strong resistance to load shocks.

It is used in shipbuilding, water heaters, testing instruments, humidifiers, washing machines, refrigeration air conditioners, dehumidifiers, water dispensers. Papermaking, printing, generator equipment, petrochemical, food industry, water treatment, electrician, dye industry, hydraulic machinery, etc. have been widely used.

Choosing the Right Float Switch for Water Tank

**SI-U04 Magnetic Float Level Sensor-Reed Switch**

**SI-U05 Cable Float Level Sensor & Swtich**

Choose a float level switch that suits you. It can save costs and ensure a long service life.

Applicable media: clean water, sewage, oil and acid-base liquids below medium concentration. Choose plastic or stainless steel material respectively.
Material. There are two kinds of stainless steel (maximum specification 304) and plastic PVC. According to the different materials, the temperature and pH are also different. It needs to be selected according to the actual environment.
Working principle (the most important point). It is to use micro switch (plastic material) or mercury switch (stainless steel material) as contact parts. When the cable float rises at a certain angle with the weight as the origin, it usually moves slightly The rising angle of the switch is 28°±2°, and the rising angle of the mercury switch is 10°±2°. The switch will have ON or OFF signal output, which acts as an alarm.
Operating temperature: The temperature resistance of conventional plastic cable liquid level switches is within 80 degrees. Stainless steel can be selected from 80 degrees and 120 degrees (depending on the selected wire).
Connection method: direct wire or add flange and junction box.
Outlet material. Generally, the plastic cable float switch is equipped with a low-temperature cable as standard. For stainless steel, you can choose a low-temperature sheathed cable or a high-temperature silicone cable. Special requirements can be customized.
Voltage and current. The withstand voltage is 220V (it must be overloaded by an AC contactor). The rated current is 8A, and the rated heating current is 10A. Please pay attention to the voltage and current not exceeding. Otherwise, the switch will burn out.
Outlet length. The length of the line is proportional to the depth of the liquid level you need to detect. For example, if it is necessary to detect three meters, the switch outlet should be at least four meters above. The lead length is generally: 3m\ 4m\ 5m, etc. If longer, it can be customized.

Extended Reading: 3 inch (3″) Water Flow Meter

Which Level Control Switch Is Better for the Sewage Pool?

Which level switch is better for the sewage pool?

To answer this question, you must first consider the environment. Consider whether it is domestic sewage or industrial sewage. Industrial sewage generally contains heavy metals and the like. General customers will require non-contact measurement. If there are not many impurities in domestic sewage, the input type can be used. If there are too many impurities, it is better to use non-contact type.

Sewage treatment should also have a recycling process. For example, some organic water collection in tanks. Generally, it is sufficient to use the input type. Next, pay attention to the following points:

There are many impurities, non-contact;
Strong corrosiveness, non-contact;
Environmental pressure input type of foam ozone tank;

Extended reading: GWR Corrosive Liquid Chemical Level Sensor

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Sino-Inst offers over 10 Float Switches for Water Tanks.

About 50% of these are liquid level meters, 40% is the tank level sensor.

A wide variety of level meters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of level measurement instrumentation, located in China.

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A New Choice for Boiler Drum Level Measurement – Guided Wave Radar

Posted on January 19, 2022 by KimGuo11

Excessive liquid level will cause the steam-water separation of the steam drum. Increase the moisture carried by the steam. Deteriorating steam quality. It can cause water to enter the turbine, and even damage its blades in severe cases. If the liquid level is too low, there is less water in the drum. Water vaporizes faster. Causes the downpipe to carry steam. Cause the steam drum to burst or explode.

Therefore, it is important to choose a suitable and safe liquid level sensor to measure Boiler Drum Level.

RFQ More Level Sensor

Why is Boiler Drum Level Measurement important?

In the boiler evaporation equipment, the boiler drum is an important part. The natural circulation loop of the boiler is composed of it, the upper header, the lower header, the lead-out pipe, the descending pipe and the water cooling wall. How the boiler drum level is controlled will affect the following aspects.

When the liquid level of the boiler drum is too high. The space where the steam is located is reduced. This results in increased water carryover in the steam. Causes the steam quality to deteriorate. This is one of them. Second, the water level is too high, and the superheater pipe is easy to accumulate salt scale. The tube is overheated and damaged.

The above two situations will occur when the water level is too high. What happens when the steam drum is full of water?

When the steam drum is full of water, there will be a lot of water in the steam. Severe hydraulic shock to steam lines.

The boiler drum water level is too high or too full. So is it too low?
The answer is of course no.

When the water level in the drum is too low, the water circulation will be disrupted. The water wall will exceed the usual temperature and overheat. If the water level is low to a certain extent, there is a serious water shortage. The device is likely to be severely damaged. even lead to accidents.

From the above content, it can be seen that the high and low water level of the boiler drum will have a certain impact on the safe operation of the boiler. In severe cases, it may even affect the safe operation of the unit. Therefore, it is very important to control the liquid level of the boiler drum. The use of liquid level gauges for liquid level measurement is also an inevitable result.

Liquid level data, seemingly unimportant, is actually very important. So no matter what industry, you must understand your own working conditions when choosing a liquid level sensor. Select the liquid level sensor according to the working conditions, so as to choose the appropriate one.

Extended reading: Hydrostatic Level Measurement

Current Situation of Drum Level Measurement

At present, from the basic principle of drum level measurement. The widely used are mainly based on two principles of connecting pipe type (static pressure) and differential pressure type. Drum level measurement instruments mainly include differential pressure level transmitters, Displacer Level Transmitters and guided wave radar level sensors.

The measurement principle of Differential pressure level transmitters is to measure the liquid level by converting the change of liquid level height into the change of differential pressure. This conversion is achieved by balancing the vessel to form a reference water column. The key to its accurate liquid level measurement is the accurate conversion between liquid level and differential pressure.

Using a differential pressure transmitter to measure boiler drum level must take into account certain physical properties of the fluid. The steam drum contains a two-phase mixture of water and steam under saturated conditions. The density of water and steam varies with saturation temperature or pressure. The density of saturated steam on the water surface, as well as the density of saturated water in the drum, must be considered.

Maybe you can refer to: Rosemount-Boiler Drum Level Transmitter Calibration

More about: Use Differential Pressure Transmitter to Measure Liquid Level

The Displacer Level Transmitter works based on the principle of buoyancy.

When the liquid level is at 0, the torsional moment generated by the torsion tube by the gravity of the float is the largest. The rotation angle of the torsion tube is at 0°.

When the liquid level gradually rises to the highest level, the torsion tube is subjected to buoyancy to generate a torque torque and rotates through an angle. The transmitter converts the angle into a 4~20mA DC signal. The signal is proportional to the measured liquid level.

The density change of the medium in this measurement method will affect the measurement accuracy. Mechanical vibration will also cause inaccurate readings.

The electrical contact level sensors belong to the connected tube type level sensors. The principle is to measure the liquid level by using the characteristics that the electrode in the boiler water has a small impedance to the cylinder and the electrode in the steam has a large impedance to the cylinder.

The conductivity of boiler water in high-pressure boilers is generally tens of thousands to hundreds of thousands of times greater than that of saturated steam. Therefore, the indication value of the electric contact level gauge is less affected by changes in the pressure of the steam drum. It can easily transmit liquid level signals remotely. .

However, the reliability of the sampling sensor is poor, the mechanical seal of the motor is easy to leak, the service life of the electrode is short, the indication is discontinuous, and there is a certain amount of maintenance.

Extended Reading: FMCW Radar for High Temperature Level Sensor

To sum up, due to the complexity of the measurement object of the liquid level in the drum, the uncertain factors in the actual operation and the large measurement error, the measurement of the liquid level sensor in the drum often has a large deviation.

Guided wave radar liquid level measurement is a brand-new measurement technology. It overcomes the shortcomings of liquid level measurement instruments such as differential pressure type, float type, and electrical contact. It is a brand-new liquid level measurement device.

Guided Wave Radar Level Transmitter

Guided wave radar level transmitter uses guided wave radar (GWR) technology. Based on the reflection of microwave on the surface medium. Through the probe, continuous level measurement of liquid and solid levels is completed.

A guided wave radar level transmitter is also called a wave-guided radar level sensor. They can measure both levels and the interface between two media. Through probe rod or cable, complete level contact types continuous level measurement. Such as Coaxial Probe Guided Wave Radar Level Transmitter. This is different from ultrasonic level measurement, which is non-contact measurement. A guided wave radar level transmitter is often used for tank level measurement. Including liquid and solid. Output 4～20mA/HART, so as to measure and control the level during production.

Guided Wave Radar Level Transmitter is a liquid level transmitter based on the principle of time domain reflectometry (TDR).

The electromagnetic pulse propagates along the steel cable or probe at the speed of light. When encountering the surface of the measured medium. Part of the pulse of the Guided Wave Radar Level Transmitter is reflected to form an echo and return to the pulse transmitter along the same path. The transmitter and the measured medium The distance from the surface is proportional to the travel time of the pulse in between. The liquid level height is calculated.

The advantages of the Guided wave radar level transmitter are contact measurement. Signal stability. Measurement unaffected by liquid density and electrical properties. Maintenance free, etc.

However, when the guided wave radar level gauge measures high temperature and high pressure liquids, the measured value will have a large deviation due to the polarization of the air. And the greater the distance between the measurement reference point (flange) and the surface of the measurement medium. The resulting The larger the systematic error.

1) The measurement is accurate.

Density and dielectric constant changes of the medium, as well as fog and foam, have no effect on the measurement. At the same time, the deposition and fouling of the medium on the wave guide have little effect on the liquid level measurement. This is because the signal transmission in the waveguide is not affected by liquid level fluctuations and obstacles in the tank, etc. The feedback signal received by the instrument is correspondingly stronger.

Furthermore, the detected interfering spurious signals in the return signal are extremely small. It is only necessary to detect the transit time of the electromagnetic wave. No signal processing and discrimination is required. Therefore, the measurement of the drum level is accurate.

2) It is convenient to measure and adjust.

Because electromagnetic waves are constant. When programming configuration, only need to input relevant parameters such as measuring range on site. No migration is required to change meter ranges and field calibrations. Greatly improve the efficiency of adjusting the instrument.

More about Advantages of Coaxial Probes

3) Low installation cost and easy maintenance.

Guided wave radar level transmitter consumes less energy. The two-wire transmission method greatly saves the installation cost.

At the same time, the quick universal joint between the probe and the transmitter makes the installation easier. It is more conducive to future maintenance.

Extended reading: Float Level Sensors – Single and Multipoint

Guided wave radar level transmitter measures drum level

A new type of Guided wave radar level transmitter is used to measure the liquid level of the steam drum of a certain device. The level gauge is certified as a limiting device for high temperature water (HW) and low temperature water (LW) containers. Complies with EN12952-11 and EN12953-9 (TUV certified) standards.

Guided wave radar level transmitter with GPC function technology. Improve the accuracy and reliability of the Guided wave radar level transmitter in high temperature and high pressure environment.

GPC technology

Under high temperature and high pressure conditions, the propagation speed of electromagnetic wave signals in the vapor above the medium (polarized medium) will decrease. At this time, the liquid level value measured by the radar will decrease.

Use guided wave radar with gas phase automatic compensation. Guided wave radar produces a reference reflection within the distance from the flange (measurement reference point), which varies along the rod probe.

Under normal temperature and pressure. The electromagnetic wave has two reflected echoes at the compensation reference end and the liquid level reflecting surface. The measurement is accurate at this time. At this time, the reference distance (the distance from the measurement reference point to the reference rod) is calibrated.

At high pressure, due to the polarization effect of the gas. At this time, the measured distance (the distance from the measurement reference point to the liquid level) has a large deviation from the actual value of the liquid level. if not compensated. Then there will be a large error in the measurement value.

The measured value is compensated by converting the reference reflection.

The calculation formula is: compensation distance = reference distance × (measured distance/measured distance). An accurate actual liquid level value can be obtained.

Application

The steam drum of the boiler plant is the main part of the steam production system.

Use the high temperature heat in the flue gas section of the reformer and the high temperature waste heat of the reformer gas at the furnace outlet. Produce 10.5MPa high pressure steam.

Part of it participates in the reaction as the steam distribution in the process. The other part is sent to the high-pressure steam pipe network to realize the comprehensive utilization of thermal energy and improve the operation efficiency of the device.

Because the traditional measurement can not meet the measurement requirements well. It is necessary to choose other products to replace.

Due to the importance of the steam drum to the boiler plant. To measure the liquid level of the steam drum, three measuring instruments are designed and used: Guided wave radar level transmitter and differential pressure liquid level level transmitter.

Measured by example. At high temperature, the measurement error of ordinary guided wave radar (without GPC) is as high as 18%. With GPC, the measurement error is only 2%.

The measurement data of the GPC guided wave radar level gauge at high temperature is relatively stable and true.

Therefore, it is a perfect combination of guided wave radar technology with GPC and advanced signal processing technology. This makes the guided wave radar level gauge with GPC an ideal solution for level measurement in steam and turbulent boiling conditions.

Extended reading: Vortex Steam Flow Meter

Featured Guided Wave Radar Level Transmitters

SIRD-702 GWR Corrosive Liquid Chemical Level Sensor

SIRD-703 GWR Bulk Solids & Powder Solid Level Sensor

SIRD-704 Coaxial Probe Guided Wave Radar Level Transmitter

SIRD-705 GWR Level Sensor for High Temperature & High Pressure

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Sino-Inst offers over 10 GWR Corrosive Liquid Chemical Level Sensors for level measurement. About 50% of these are Guided Radar level meters, 40% is the tank level sensor.

A wide variety of GWR Corrosive Liquid Chemical Level Sensors options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Guided Wave radar level measurement instrumentation, located in China.

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Tech Guide for Non-Contact Radar Type Level Transmitters

Posted on January 11, 2022 by KimGuo11

What Is Radar Type Level Transmitter?

The Radar Type Level Transmitter is a kind of instrument that measures the liquid level in the container by microwave. The Radar Type Level Transmitter provides reliable non-contact, maintenance-free continuous measurement of liquids in metal tanks or containers. Not affected by pressure, vacuum or temperature.

Excellent performance under harsh measurement conditions such as flammable, explosive, highly corrosive, high temperature, and viscous. Ideal for corrosive liquids, viscous liquids, slurries, or other applications where direct contact with the medium is not desired. Especially suitable for the measurement of large vertical tanks and spherical tanks. Low dielectric properties allow operation in liquids with a dielectric constant of 2 or greater. It can be used in almost every occasion.

RFQ Level Sensors

Features
Specifications
Industries
Applications
Ordering Information

Features of Radar Type Level Transmitters

Radar Type Level Transmitter can measure liquid and solid media. For example: crude oil, slurry, raw coal, pulverized coal, volatile liquids, etc.;
Can be measured in vacuum can measure all media with a dielectric constant> 1.2. Measuring range up to 150m;
The power supply and output signal pass a two-core cable (loop circuit), using 4…20mA output or digital signal output;
Non-contact measurement and installation are convenient and extremely stable materials are used. It is accurate and reliable with a resolution of up to 1mm;
Not affected by noise, steam, dust, vacuum and other working conditions;
Not subject to changes in medium density and temperature. Process pressure can reach 400bar, medium temperature can reach -200℃ to 800℃;
There are various installation methods to choose from: Top installation. Side installation. Bypass pipe installation. And waveguide installation;
Debugging can be selected in many ways: Using programming module debugging , equal to an analytical processing instrument. SOFT software debugging. HART handheld programmer debugging. Debugging is convenient and fast.

Advantages of radar level measurement

Measurement is not affected by temperature, pressure or dust
User-friendly adjustment saves time
Non-contact, continuous level measurement over larger ranges
Unaffected by sludge and biomass, dust, foam, oil, grease and other coatings, uneven surfaces, turbulence, pressure, and vacuum
Single frequency radar level sensors for liquid sensing, dual frequency radar level sensors for level measurement of aggregates, gravel, sand, coal, asphalt, and other solids
Simple mounting and push-button calibration

Radar Level Transmitters Specifications

– 120GHz

Series	SI-FMF11	SI-FMF12	SI-FMF13	SI-FMF15	SI-FMF21
Applicable medium:	Liquid	Liquid	Liquid	Liquid	Solid
Measuring range:	0.05m~30m	0.05m~35m	0.1m~100m	0.1m~35m	0.3m~150m
Antenna:	32mm lens antenna	42mm lens antenna	78mm lens antenna	78mm lens antenna	78mm lens antenna + purging (or without purging)
Accuracy:	±2mm	±2mm	±2mm (range below 35m) ±5mm (range between 35m-100m)	±2mm	±5mm
Medium temperature:	-40～80℃	-40～110℃	-40～110℃	-40～200℃	-40～110℃
Medium pressure:	-0.1～0.3 MPa	-0.1～1.6MPa	-0.1～0.3MPa	-0.1～2.5MPa	-0.1～0.3MPa
Signal output:	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus
Power supply:	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V
Shell:	Aluminum/plastic/stainless steel	Aluminum/plastic/stainless steel	Aluminum/plastic/stainless steel	Aluminum /Plastic /Stainless steel	Aluminum/plastic/stainless steel
Process connection:	G1½A / 1½NPT thread / flange ≥DN50	G2A thread/flange≥DN65	Flange ≥DN80	Flange ≥DN80	Flange ≥DN80

– 80 GHz

Series	LM78x0	LM78x1	LM78x2
Applicable medium:	For normal solid application	For liquid application	For large range solid application
Measuring range:	0.3 m ~ 60m	0.08m~30m	0.6m ~ 120m
Antenna:	Lens antenna/ anti-corrosive antenna / flange isolated by quartz	Lens antenna/ anti-corrosive antenna / flange isolated by quartz	Lens antenna/ anti-corrosive antenna / flange isolated by quartz
Accuracy:	±1mm	±1mm	±1mm
Medium temperature:	T0:-40~85℃; T1:-40~200℃; T2:-40~500℃; T3:-40~1000℃	T0:-40~85℃; T1:-40~200℃; T2:-40~500℃; T3:-40~1000℃	T0:-40~85℃; T1:-40~200℃; T2:-40~500℃; T3:-40~1000℃
Medium pressure:	-0.1~2MPa	-0.1~2MPa	-0.1~2MPa
Signal output:	4 ~ 20mA or RS-485	4 ~ 20mA or RS-485	4 ~ 20mA or RS-485
Power supply:	15~28VDC	15~28VDC	15~28VDC
Shell:	Aluminum alloy, stainless steel	Aluminum alloy, stainless steel	Aluminum alloy, stainless steel
Process connection:	Thread or flange	Thread or flange	Thread or flange

– 26 GHz

Series	SIRD-901	SIRD-902	SIRD-902T	SIRD-903	SIRD-904	SIRD-905	SIRD-906	SIRD-908	SIRD-909
Applicable medium:	All kinds of corrosive liquid	Slightly corrosive liquid	Corrosive liquids, vapors, volatile liquids	Solid material, Strong dust easy to crystallize, condensation occasion	Solid material, Strong dust, easy to crystallize, condensation occasion	Solid particles, Powder	Hygienic liquid storage, Corrosive container	Rivers, Lakes, Shoal	Rivers, Lakes, Shoal
Measuring range:	10 meters	30 meters	20 meters	70 meters	80 meters	30 meters	20 meters	30 meters	70 meters
Antenna:	Sealing horn / PTEE	Horn Antenna Φ46mm/ Horn Antenna Φ76mm /Horn Antenna Φ96mm / Special Custom	Internal tapered rod antenna PVDF / 78mm Internal tapered rod antenna PFA / 78mm	Horn Antenna Φ76mm / Φ96mm / Φ121mm/Special Custom	Parabolic antenna Φ196mm /Φ242mm	Horn Antenna Φ76mm / Φ96mm / Φ121mm/Special Custom	Viton / (-40~130) ℃	Horn antenna with 76mm/ 96mm	Horn antenna with 76mm/ 96mm/ special custom
Accuracy:	± 5mm	± 3mm	±3mm	±15mm	±15mm	±15mm	± 3mm	± 3mm	± 10mm
Medium temperature:	-40℃~130℃	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃ ~ 130℃	-40℃ ~ 100℃	40℃ ~ 100℃
Medium pressure:	-0.1~0.3 MPa	-0.1 ~ 4.0 MPa	-0.1~2.0 MPa	-0.1~4.0 MPa (Flat flange) -0.1~0.3MPa (Universal flange)	-0.1 ~ 0.3 MPa	-0.1 ~ 4.0 MPa (Flat flange) -0.1 ~ 0.3 MPa (Universal Flange)	-0.1~4.0 MPa	Normal-pressure	Normal-pressure
Signal output:	4… 20mA /HART （2-wire / 4-wire） RS485/ Modbus	4… 20mA /HART（2-wire / 4-wire） RS485/ Modbus	4… 20mA /HART（2-wire / 4-wire） RS485/ Modbus	4… 20mA /HART （2-wire / 4-wire） RS485/ Modbus	4… 20mA / HART (2-wire / 4-wire ) RS485/ Modbus	4… 20mA /HART (2-wire / 4-wire ) RS485/ Modbus	4… 20mA/HART (2-wire / 4-wire ) RS485/ Modbus	RS485 / Modbus ( 6~24V DC) 4~20mA / Hart Two-wire ( 24V DC)	RS485 / Modbus ( 6~24V DC) 4~20mA / Hart Two wire ( 24V DC)
Power supply:	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V ）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	(6 – 24V) DC / Four-wire 24V DC / Two wire	(6 – 24V) DC / Four-wire 24V DC / Two wire
Shell:	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic /Single chamber	Aluminum / Plastic / Single chamber
Process connection:	Thread, Flange	Thread, Flange	Flange	Universal Flange	Thread, Universal Flange	Thread, Flange	Flange	Thread G1½ A″ /Frame /Flange	Thread G1½ A″ /Frame /Flange

– 6 GHz

Series	SIRD-801	SIRD-802	SIRD-803	SIRD-804	SIRD-805	SIRD-806
Applicable medium:	Liquid, slightly corrosive liquid	Liquid, especially for corrosive liquid	Liquid, especially with pressure and Volatile Liquid	Solid particles or block material, And it is not suitable for solid powder	Liquid, especially suitable for low dielectric constant, sticky, with mixing liquid	Solid, especially suitable for high temperature conditions
Measuring range:	20m	20m	35m	35m	20m	15m
Antenna:	The Rod Antenna ( PP/PTFE )	The Rod Antenna (PTFE)	The Horn Antenna	The Horn Antenna	The Horn Antenna	The Horn Antenna
Accuracy:	±10mm	± 10mm	± 10mm	± 20mm	± 10mm	± 20mm
Medium temperature:	(-40 ~ 130) ℃	-40℃~130℃（Standard type） -40℃~180℃（High temperature type）	-40℃~130℃（Standard type） -40℃~250℃（High temperature type）	-40℃~130℃（Standard type） -40℃~250℃（High temperature type）	-40℃~130℃（Standard type） -40℃~250℃（High temperature type）	(-40 ~ 400) ℃
Medium pressure:	(-0.1 ~ 0.3) MPa	(-0.1 ~ 1.6) MPa	(-0.1 ~ 4) MPa	(-0.1 ~ 0.3) MPa	(-0.1 ~ 4) MPa	(-0.1 ~ 0.3) MPa
Signal output:	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART
Power supply:	Two-wire (DC24V) Four-wire（DC24V / AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）
Shell:	Aluminum /Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel
Process connection:	Flange (optional) / Thread	With PTFE plate flange	Flange (optional) / Thread	Universal joint flange	Flange	Flange

Industrial applications of Radar Type Level Transmitters

Radar level sensors have a very wide range of applications. Almost all media can be measured. This is something other types of meters can only look up to.

It can measure not only spherical tanks and horizontal tanks, but also the liquid level measurement of cylindrical tanks, cylindrical cone tanks, etc.

In terms of tank function, the liquid level in storage tanks, buffer tanks, microwave tubes, and bypass pipes can be measured.

As far as the measured medium is concerned, liquid, particle, slurry, etc. can be measured.

Steel industry

Production processes:
Coal coking: coal preparation bunker, coke bunker, gas tank, coal tar and crude benzene tank
Sintering plant: sintered material mixing bin, cold return ore, pelletizing bin
Ironmaking plant: ironmaking intermediate warehouse, blast furnace material level, etc.

Working characteristics:
Solid material measurement, strong dust, low dielectric constant, long range.
Volatile crystallization of tar and crude benzene;
High temperature and dust adhesion of blast furnace material level;

Selection application:
Solid measurement is mainly based on high-frequency pulse radar level meter.
Guided wave radar level meter can be used for crude benzene and coal tar.

Coal industry

Production link: raw coal bunker, pulverized coal bunker, coal gangue storage level, coal washing pool.
Working condition characteristics: typical solid material measurement, strong dust, low dielectric constant. Long range.
Selection and application: high-frequency pulse radar level meter is mainly used.

Cement industry

Production link: raw material warehouse, raw material homogenization warehouse, clinker warehouse, finished product warehouse, fly ash warehouse, raw coal warehouse, gypsum warehouse, cement slag warehouse
Working condition characteristics: Typical solid material measurement, strong dust, low dielectric constant, long range.
Selection application: High-frequency pulse radar level meter is mainly used.

Power industry thermal power, hydropower, biological power generation

Production processes:
(thermal power) raw coal and pulverized coal silo, circulating water pool, low and high water level, limestone powder silo, ash hopper material level, ash silo, slag silo, desulfurization tower liquid level

Working characteristics:
Solid material measurement, strong dust, low dielectric constant, long range.
Low water level, high temperature and high pressure;
Desulfurization tower liquid level foam, water vapor, crystallization, spray interference, side loading

Selection application:
The measurement of solid materials is mainly based on high-frequency pulse radar level meters.
High and low water level application of guided wave radar;
The low frequency radar level gauge is commonly used in the desulfurization tower liquid level;

Non-ferrous metallurgy industry – aluminum, nickel, zinc, and titanium industries

Production processes:
(Aluminum production) slurry tank, dissolution tank, flash tank, post-dissolution tank, flocculation tank, settling tank, decomposition tank, alumina powder silo.

Working characteristics:
Various chemical reaction environments have high temperature, strong water vapor, stirring or corrosion factors

Selection application:
For the influence of high temperature water vapor, refer to factors such as corrosion, measuring range, stirring, and hanging material;
Choose between guided wave radar or low frequency radar level gauge.
High-frequency radar level gauges are still preferred for solids measurements.

Water conservancy industry

Applications: Hydrological monitoring, flood control alarm, farmland irrigation

Characteristics of working conditions: The signal transmission is far away, the power supply voltage is low, and the installation position is affected by the embankment and dam. The radar wave with small beam angle is preferred.

Selection application: choose high-frequency radar level gauge with MODBUS protocol

Food and pharmaceutical industry

Production processes:
Edible oil tank, soybean meal storage tank

Working characteristics:
Simple tank environment, or with precision requirements, antenna hygiene requirements in the pharmaceutical and food industries

Selection application:
The high-frequency radar level meter is preferred for the measurement environment with high precision;
If there are hygienic requirements, an antenna with a sealed material that meets hygienic conditions should be selected;

Industrial petrochemical, coal chemical

Production processes:
Petrochemical: crude oil depot, gasoline tank, diesel tank, natural gas tank, etc.
Coal coke chemical industry: refer to the coal industry
Calcium carbide chemical industry: coal bunker, calcium carbide bunker, etc.

Working characteristics:
Solid material measurement, strong dust, low dielectric constant, long range.
The measurement environment of various oil depots is simple and may have accuracy requirements
There is pressure in the natural gas spherical tank, and the dielectric constant is small
There is oscillating interference echo in gas tank measurement
Various chemical reactor conditions are different

Selection application:
The measurement of solid materials is mainly based on high-frequency pulse radar level meters.
For various oil depots with precision requirements, high-frequency radar is preferred for spherical tanks;
Gas cabinets that are prone to oscillating interference signals also have limited selection of high-frequency radars;
The chemical reactor is selected according to the actual conditions and parameters;

Environmental protection and water treatment industry

Processing link:
Water collecting well, coarse grid, fine grid, biochemical reaction pool, mud flushing pool, sludge pool, well dissolving medicine pool.

Working characteristics:
Except for ultra-long-range and narrow spaces such as water collection wells, other environments are relatively simple.

Selection application:
The water collecting well can choose guided wave radar or high-frequency radar level gauge according to the range requirements. Generally, ultrasonic level gauges are more commonly used in simple environments.

Semiconductor industry

Production link: silicon micropowder warehouse
Working condition characteristics: very low dielectric constant, strong dust
Selection application: high frequency radar level meter

Radar Type Level Transmitters Applications

Liquids with foam, gases (CO2,methane) and other fumes
Highly corrosive liquids such as acids and solvents
High temperature applications up to 350F such as asphalt
Slurries
Acids, Caustics and Solvents
Vacuum applications
Diesel crude oil
Sanitary applications
Oil-water interface monitoring and detection

Extended reading: Hydrostatic Level Measurement

Ordering Information

When ordering Radar Type Level Transmitters, we need to consider the following factors:

Application medium and measuring range:
The physical properties of the liquid medium to be measured have a great influence on the measurement range. Liquids are usually divided into four categories: A, B, C, and D.

Class A: non-conductive liquid, the dielectric constant is less than 1.4, which has a great influence on the measurement distance, and the measurement range is
The circumference is small. such as propane.

Class B: non-conductive liquid, the dielectric constant is about 1.9~4, which has a great influence on the measurement distance.
The volume range is medium. Such as gasoline, oil, etc.

Class C: The dielectric constant is about 4~10, which has little influence on the measurement distance and has a large measurement range. like
Concentrated acid, organic solvent vinegar, ethanol, acetone, oil-water mixture, etc.

Class D: conductive liquid, dielectric constant > 10, little influence on the measurement distance, the most measuring range
big. Such as aqueous solution, diluted acid and alkali, etc. ·

When the liquid surface of the tank is smooth. The measurement range of Class A liquid is 5m. For Class B fluids
The volume measurement range is 10m. Class C liquid 15m. Class D liquids can reach 20m. When the liquid level fluctuates, the corresponding measurement range should be appropriately reduced.

Process temperature and process pressure
Radar Type Level Transmitters are suitable for high temperature and high pressure measurement. However, the temperature and pressure of the tank need to be clearly confirmed.
Antenna style
The radar level gauge consists of electronic components, waveguide connectors, mounting flanges and antennas.
The shape of the antenna determines the thin focus and sensitivity. Therefore, the choice of antenna is particularly important.

3.1 Flare Antenna
The horn antenna is suitable for most occasions and has the advantages of good focusing, stable physical and chemical properties, durability and firmness. But it is not suitable for the measurement of corrosive media.

3.2 Rod Antenna
Rod antennas are chemically stable, easy to clean and insensitive to condensation. Suitable for corrosive media.

3.3 Under-the-flange antenna
The flange-mounted antenna is mainly used for the measurement of strong corrosive media.

3.4 Parabolic Antenna
The parabolic antenna has good focusing and is not affected by heating steam, and is especially suitable for in-tank measurement of large containers with heating steam, such as the measurement of residual oil, asphalt, etc., and the measurement range can reach 40m.

3.5 Antenna with stilling pipe or bypass pipe
Install a casing for the antenna. The casing is equivalent to a wire that transmits radar signals. It is suitable for occasions where the surface of the medium fluctuates greatly or the dielectric constant is small.

Display and output signal requirements.
Our Radar Type Level Transmitters are generally configured with local digital displays. A split display can also be configured if required by the customer.
Support 4-20mA, 485 and other signal output.
Installation method and installation size.
Radar Type Level Transmitters support flanged, threaded, bracket mounts. When ordering Radar Type Level Transmitter, customers need to confirm the size with the manufacturer in advance.
Special requirements.
For example, anti-corrosion, explosion-proof, sanitary and so on.

Extended reading: How to convert a 4-20mA to 0-10V /1-5V signal?

Radar Level Measurement and guide wave radar level measurement Image source: https://instrumentationtools.com/radar-level-measurement/

Very short microwave pulses with very low energy are transmitted and received through the antenna system. The radar wave runs at the speed of light. The operating time can be converted into level signals by electronic components. A special time extension method can ensure stable and accurate measurement in a very short time.

Electromagnetic waves propagate in the air at the speed of light. The distance between the radar level gauge and the surface of the material can be expressed by the following formula: 　　

D = (1/2)*CT

In the formula:

D ———the distance between the radar level gauge and the surface of the material; 　　

C ———Speed of light 　　

T ———Pulse time.

Then the liquid level is: 　　L = E-D

In the formula:

L — liquid level; 　　

E ———The total height of the tank; 　　

D ———Air height.

Even in the presence of false reflections, the new micro-processing technology and the unique ECHOFOX- software can accurately analyze the level echo. By inputting the size of the container, the distance value can be converted into a signal proportional to the level. The instrument can be debugged with empty positions.

Radar Type Level Transmitters have the advantages of high precision, long life, low maintenance, high performance and so on. Widely used in the industry. Continuous measurement can be performed in harsh environments such as high temperature, high pressure, steam, vacuum and high dust. However, different models of Radar Type Level Transmitters are selected in different environments, and the antennas used are also different.

Rod antenna

Insulated rod antennas are usually made of polymer materials such as polytetrafluoroethylene and polypropylene. Good corrosion resistance. Can be used in strong acid, alkali and other media.

However, the microwave emission angle is relatively large (about 30°), and there are many side lobes. For the case where the structure of the tank is more complicated. There will be more interference echoes. The signal-to-noise ratio is small and the precision is low.

But easy to clean. It is often used to measure tanks and corrosive media with good operating conditions, large diameters, and small measuring ranges.

If the measured medium is volatile and condensed, it is better to choose a rod antenna or a water drop antenna.

Flare antenna

At the same frequency, the larger the diameter of the horn, the smaller the emission angle. If it is a high frequency radar level gauge, the emission angle is smaller and the accuracy is higher.

Most economical radar level gauges use microwave frequencies of 5.8GHz or 6.3GHz. Its emission angle is large, and it is easy to generate interference echoes on the container wall or internal components.

Although the horn antenna increases can reduce the emission angle. But the volume increases and the installation is inconvenient. And the improvement is limited.

Using high-frequency radar, the launch angle can reach 8°. This enables high measurement accuracy even when measuring the level of long and narrow tanks.

If it is used in a large-range measurement site, choose a radar level meter with a large horn antenna. Small horn antennas are suitable for small containers.

If the fluidity of the measured medium is poor and there is a phenomenon of hanging material, then choose a horn or a rod radar level gauge.

Parabolic antenna

This is a new type of antenna that has been introduced recently, and is mostly used in radars that transmit at high frequencies. Because its emission angle is only 7°. Ideal for measuring precise targets and measuring around obstacles.

But its antenna size is large. If the X-band is used, the diameter is up to Φ454mm, and the opening size should be larger than 500mm, which is not very convenient for installation and use.

Plane antenna

The planar antenna adopts planar array technology. That is, a multi-point emission source. Compared with a single-point emission source, it is measured on a plane. rather than a definite point.

With the corresponding electronic circuit, the measurement accuracy of the radar level gauge can reach ±1mm. It can be used for precision metering of storage tanks. Mainly used for metrology-grade radar level gauges. Planar antennas are suitable for a variety of working conditions.

Extended Reading: FMCW Radar for High Temperature Level Sensor

Sleeve antenna

When the dielectric constant is small (1.6~3) or the liquid surface produces continuous eddy current or the device in the container causes false reflection, this type of instrument should be selected.

The casing has a focusing effect on the radar wave, and the antenna is installed in the still-pipe or bypass pipe.

The inner diameter of the casing has an effect on the propagation time of the radar wave. Therefore, when setting the parameters, the parameters of the inner diameter of the casing should be set. Compensation for in-travel time.

In addition, this type of antenna requires that the measured medium has good fluidity and is not easy to hang.

If the container under test has a stirring paddle. And the radius of rotation of the blade is almost equal to the diameter of the tank. Then the echo of the radar level gauge will be seriously disturbed. At this time, the still-pipe radar level gauge is used.

Guided wave radar antenna

Sending and receiving electromagnetic waves through guided metal or cables is a contact measurement.

Because it has little effect on dust, steam, and the adhesion medium on the probe. Therefore, it is more widely used in solid material level and liquid level measurement with small dielectric constant.

The dual-cable guided wave radar level gauge uses the change of measuring capacitance to measure the level of the liquid level. The medium between the two electrodes is the liquid and the gas above it. Suitable for level measurement of corrosive and high pressure media.

Fundamentally solve the influence of temperature, humidity, pressure, material conductivity and other factors on the measurement process. Therefore, it has extremely high anti-interference and reliability.

Coaxial tube radar level gauge is a guided wave radar level gauge equipped with a coaxial tube probe. It is used for liquid level measurement and control of liquids with low dielectric constant or surface fluctuations. Such as If the dielectric constant of the measured material is too low, the general type of radar level meter is not suitable.

Extended Reading: Guided-wave radar (GWR) level transmitter working principle

Most of the time, people don’t think of using radar level sensors as level switches.
The output of radar liquid level sensor is mostly 4-20mA.
However, if the customer’s working conditions require output switching. It can also be customized.
For example, we can add a secondary gauge to the output of the radar level sensor. Convert the current signal into a digital signal.

Extended reading: Float Level Sensors – Single and Multipoint

Radar Type Level Transmitters can be used not only in various tanks. It can also be used in various storage tanks.

Extended Reading: Featured Silo Level Sensors

Different storage tanks have different types of Radar Type Level Transmitters.

A spherical tank, also known as a spherical container, has a spherical shell.
This kind of storage tank is mainly used for the storage and transportation of various gases, liquids and liquefied gases. It is widely used in chemical, metallurgy, petroleum and other industries.

Vaulted tank, also known as vaulted storage tank. It refers to the steel container with the top of the storage tank in the shape of a spherical tank and the tank body in the shape of a cylinder.
This type of storage tank is widely used in the fluid industry, such as the most common type C liquids. In addition, refineries also commonly use vaulted tanks to store diesel fuel, fuel oil, and more.

Floating roof tank, also known as floating roof storage tank. It is divided into inner floating roof tank and outer floating roof tank.

An internal floating roof tank is a floating roof tank with a tank top inside. Its top is a combination of a floating roof and a vault. The inside is a floating roof and the outside is a vault.

The floating roof of an external floating roof tank is a floating roof. It floats on the surface of the liquid storage and floats up and down as the liquid flows in and out. In refineries, these two types of storage tanks are often seen.

Horizontal storage tank. It is mainly composed of tank body, accessories and brackets. It is mainly used in the petrochemical industry for the storage of reaction media, crude oil, petroleum products, etc.

Vertical storage tank. It is mainly composed of foundation, tank bottom, tank wall, tank top and accessories. It is often used as a large oil tank for the petroleum industry. If it is divided by the structure of the tank top, vertical storage tanks can be divided into internal floating roof tanks, external floating roof tanks and vaulted roof tanks.

There are not many types of common measurement tanks for Radar Type Level Transmitters. However, different companies will install some auxiliary equipment inside according to the needs of the work, such as the most common heating coils, agitators, and so on. Therefore, when installing the radar level gauge, not only should pay attention to the shape and size of the storage tank, but also pay special attention to the internal structure.

Extended reading: Industrial Tank level indicators and Tank Level Gauges

More Featured Level Transmitters for Sale

LR series Integral flange Magnetostrictive level sensor

LT series Digital Display Magnetostrictive liquid level sensor

**ULT-200A Ultrasonic fuel tank level sensor**

**Portable Ultrasonic Liquid Level Indicator**

**HS-ULC-Pro Ultrasonic Non-contact Liquid Level Controller**

**HS-ULC Ultrasonic Level Switch-External Mounted**

Differential pressure(DP) level transmitte

Remote Seal Differential Pressure Transmitter

Frequently
Asked
Questions

We have two kinds of radar level transmitters:

Noninvasive or Non-contact Systems
Invasive or Contact System

Extended reading: Hydrostatic Level Measurement

The radar transmitter uses a high-frequency oscillator as a microwave generator. The generator produces microwave
shoot down through the antenna. When microwaves encounter obstacles, some of them are reflected back. According to the time difference between the transmitted wave and the reflected wave (ie microwave pulse travel). to calculate the distance to the material surface.

Extended reading: Amazing Solutions for Continuous Liquid Level Measurement

There are 7 main types of level transmitters that Sino-Instrument offers. Each type of transmitter works in a different way, and makes it useful for different types of processes.

For more about: Types of Level Transmitters

Difference 1.
Different measuring ranges Ultrasonic liquid level measuring range: 0-50 meters;
The radar level gauge can measure all media with medium constant >1.2 in vacuum. The measuring range can reach 120 meters.

Difference 2.
The ultrasonic level gauge emits different substances by the sensor (transducer) to emit sound waves. After being reflected by the liquid surface, it is received by the same sensor or ultrasonic receiver.
The radar level gauge emits very short microwave pulses with very low energy, which are transmitted and received through the antenna system. The radar waves travel at the speed of light.

Difference 3.
Ultrasonic level gauges are widely used to measure the height of various liquid and solid materials.
Water and sewage treatment: pump room, water collection well, biochemical reaction tank, sedimentation tank, etc.;
Electric power, mining: mortar pool, coal slurry pool, water treatment, etc.
Radar level gauges can measure liquid and solid media.
For example: crude oil, slurry, raw coal, pulverized coal, volatile liquid, etc.

Extended reading: Ultrasonic liquid level sensors

Extended Reading: Dielectric constant for radar level transmitter

About Non-Contacting Radar, Emerson also has a very comprehensive introduction. You can refer to this.

Sino-Inst offers over 10 Radar level transmitters for level measurement. About 50% of these are Radar level meters, 40% is the tank level sensor.

A wide variety of radar level meters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of radar level measurement instrumentation, located in China.

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Wastewater Level Sensor for Septic Tank-Sewage Holding Tank

Posted on January 3, 2022 by KimGuo11

Wastewater level sensor occupies a large proportion in sewage treatment applications. It is used in almost all aspects of sewage treatment. In sewage treatment, the level of waste water, sludge, chemical solutions, etc. needs to be measured. Sewage lift station and wastewater treatment plant often use radar, ultrasonic, pressure sensor, etc. To monitor the liquid level.

In the sewage treatment system using automatic control. The wastewater level sensor is used to measure the liquid level. Many also involve the start and stop of interlocking pumps and the opening and closing of control valves in automatic control.

The following combined process analysis, the selection of wastewater level sensor.

RFQ More level sensors

Featured Wastewater Level Sensors

Selection of Level Sensors for Wastewater Treatment

Sewage treatment projects involve the measurement of various process parameters such as liquid level (difference), flow, pressure, temperature, concentration (including PH, dissolved oxygen, etc.), turbidity and so on.

Because the process of sewage treatment involves many occasions that need to measure the liquid level. Also because of the characteristics of the process of sewage treatment itself. In the selection process, it is necessary to select a suitable level gauge according to the characteristics of each process and medium. It will have a great impact on the accuracy, reliability and stability of process measurement and economic life.

It is recommended to choose a level gauge with high accuracy, low maintenance, and long service life as far as possible when the budget permits. The liquid level measurement and control of the entire sewage treatment can be operated reliably, stably and safely.

Pay attention to the following points when selecting Level Sensor

Measurement object. Such as the physical and chemical properties of the measured medium. As well as working pressure and temperature, installation conditions, the speed of liquid level changes, etc.;
The sensor must be able to measure sewage. The acid, alkali and small particles in the sewage have no influence on its measurement accuracy and life.
The sensor has high measurement accuracy, easy to install and easy to adjust.
The Level Sensor display is intuitive and has analog output and alarm output functions.
Measurement and control requirements. Such as measuring range. Measurement (or control) accuracy. On-site instructions, remote instructions. The interface with the computer. Safe anti-corrosion. Reliability and ease of construction.

Extended reading: sludge blanket level detector

Wastewater Level Sensors Types

In sewage treatment, the level of waste water, sludge, chemical solutions, etc. needs to be measured. In the sewage treatment system using automatic control. The Level Sensor is used to measure liquid level. Many also involve the start and stop of interlocking pumps and the opening and closing of control valves in automatic control.

Compared with other types of measuring instruments, there are many types of level gauges suitable for sewage treatment projects. There are two types of contact and non-contact measurement.

All of the above must be considered. Pay attention to the physical and chemical properties of different measured liquids according to different types of Level Sensors.

The following will analyze the selection of the sewage treatment Level Sensor according to the combined process.

Magnetic flap Level Sensor works according to the principle of buoyancy and magnetic coupling.

When the liquid level in the measured container rises and falls. The float in the main pipe of the level gauge also rises and falls.

The permanent magnetic steel in the float is transferred to the field indicator through magnetic coupling. The red and white turning columns are driven to turn over 180.

When the liquid level rises. The turning column turns from white to red.
When the liquid level drops, the turning column turns from red to white.

The red and white boundary of the indicator is the actual height of the medium liquid level in the container, so as to realize the indication of the liquid level.

Features:

The structure is simple. The display is clear. The reading is intuitive. Especially suitable for on-site display.
There are few openings in the equipment. Generally, a magnetic flap level gauge with remote output is used. It can be monitored on site and remotely.
According to the condition of the medium. For example, the medium that is easy to be fouled and clogged. The main pipe needs to be cleaned regularly to remove the sediment in the pipe. To ensure the accuracy of the measurement. In the sewage treatment process. Magnetic flap Level Sensor is often used in chemical dissolving tanks. Liquid level measurement of acid tank\alkali tank, etc.

Extended reading: Water Tank Level Controller

The static pressure type liquid level measurement method is based on the principle that the static pressure of the liquid column is proportional to the height of the liquid column.

The liquid level measurement is achieved by measuring the static pressure generated by the height of the liquid column.

Differential pressure Level Sensor is used when the liquid level in the container changes. The static pressure generated by the liquid column also works according to the principle of change.

The static pressure type Level Sensor measures the liquid level by measuring the static pressure generated by the liquid level height.

According to P=pgh,
And the density of the liquid P.
The acceleration of gravity g is known.
As long as the pressure P is measured, the liquid level h can be calculated.

One kind of pressure instrument used for liquid level measurement is Submersible Level Sensor.

That is, put the liquid level measuring instrument into the medium of the liquid level to be measured. As the liquid level changes. Pressure detection elements such as diffused silicon in the pressure transmitter convert the static pressure into a resistance signal for liquid level detection. Submersible Level Sensor can be directly put into the measured medium.

Features of Submersible Level Sensor.

The structure is simple. Adopt solid structure. No moving parts.
It is quite convenient to install and use. long lasting.
The measurement range is relatively wide. It can measure from water and oil to phases with higher viscosity, etc.
It is not affected by blistering, deposition, and electrical durability of the measured medium. No material fatigue and wear. Insensitive to vibration and shock.
The price is cheap. The reliability is relatively high.
When installing, pay attention to choosing a place where the fluid is relatively stable and the fluctuation is small. if
It is inevitable to avoid the impact of water flow, and when friction and vibration, it is necessary to install an isolation tube. Reduce the impact of water flow. Ensure the accuracy and stability of the measurement.
Install the plunger type liquid level timer. It is best to be 100mm to 200mm away from the bottom of the tank or tank. In order to reduce the sedimentation of silt and medium at the bottom of the tank or tank, which affects the accuracy of the measurement.
In an environment with poor water quality. Especially when the medium has a lot of suspended solids and impurities. Allow
Easy to block the pressure tapping hole. Affect measurement accuracy. The level gauge needs to be cleaned regularly and the pressure tapping hole should be cleared. To ensure the accuracy and stability of the measurement.

The pressure type Level Sensor is suitable for use in processes with better water quality. For example, the supernatant collection tank, filter tank. Clear pool, drain pool and SBR pool. By installing isolation pipes to avoid impurities in the sludge at the bottom of the pool, it can also be used in the thickening tank with stirring.

Float level sensor is a kind of continuous liquid level measurement sensor. Also called float level switch, float level gauge, float level transmitter.

Float level sensors are continuous level sensors. It can display the liquid level percentage, 4~20mA current and liquid level value on the spot. Output the switching value signal to conduct liquid Bit switch control. Low-cost. Single-point or multi- point measurement and control optional.

It is suitable for the liquid level measurement of the liquid medium in the container except for the on-site display. It can also be equipped with remote transmitter, liquid level controller and other functions.
The display is intuitive and eye-catching. The display direction can be changed according to user requirements.
Large measuring range. Not limited by the height of the container.
The display component is completely isolated from the measured medium. Therefore, the sealing is good and reliable.
Simple structure, easy installation and easy maintenance.
Corrosion resistance and explosion-proof.

Ultrasonic Level Sensor is a non-contact meter that uses the principle of echo ranging.

The echo ranging principle is also called the travel time or propagation time measurement principle.

It emits energy waves through a device that can emit energy waves (usually pulse signals). The energy wave is reflected by an obstacle. The reflected signal is received by a receiving device.

Determine the level change according to the time difference of the energy wave movement process. The energy wave signal is processed by the electronic device, and finally converted into an electrical signal related to the level.

The level gauge that uses ultrasonic waves as energy waves is the Ultrasonic Level Sensor.

Ultrasound uses gas (in most cases, air is used as the propagation medium. Changes in air pressure (vacuum), temperature, humidity, and airflow will change the propagation speed of ultrasonic waves.

Features of Ultrasonic Level Sensor

Ultrasonic Level Sensor can achieve non-contact measurement. Stable and reliable operation: Ultrasonic Level Sensor is installed above the silo and liquid tank. It does not directly touch the material, which overcomes the disadvantages of other models of Ultrasonic Level Sensor that directly touch the material.
The range that can be measured is large. Liquid, block, powder level can be measured.
It can measure continuously at fixed points. And can conveniently provide remote measurement and remote control measurement signals.
The installation is simple and convenient. And no security protection is required.

The antenna of the radar sensor emits electromagnetic wave signals in the form of beams. The emission wave is being measured
The surface of the material is reflected. The reflected echo signal is still received by the antenna.

Every point in the transmitted and reflected beams is collected by ultrasonic sampling.

The signal is processed by the intelligent processor to get the distance between the medium and the probe. It is sent to the terminal display for display, alarm, operation, etc.

The distance D from the surface of the material is proportional to the time travel T of the pulse:

D=C×T/2

Where C is the speed of light and E is known due to the distance of the empty tank. Then the level L is: L=E-D

Features of Radar Level Sensor:

Radar Level Sensor adopts integrated design. There are no moving parts. There is no mechanical wear. Long service life.
Due to the characteristics of electromagnetic waves, it is not affected by the environment. Therefore, its measurement applications are relatively wide. The probe of Radar Level Sensor has no contact with the surface of the medium. It is a non-contact measurement. It can accurately and quickly measure different media. The probe is hardly affected by temperature, pressure, gas, etc. It can change greatly under bad working conditions. Use in occasions where the ultrasonic level gauges such as water vapor, steam, and foam are not competent.
Radar Level Sensor is also suitable for use in occasions where there is a stirrer and the liquid level changes impermanently.
Radar Level Sensor is relatively expensive, but it can be applied to almost every process level control process of sewage treatment.

About Water Level Sensor Types and how they work. OMEGA Engineering has a good introduction video. Let’s take a look.

Ultrasonic Septic Tank Sensor

Septic tank ultrasonic level meter is used as an instrument to intelligently detect the height of the septic tank. Played a vital role in the maintenance of public toilets.

In the previous toilet maintenance, the manure trucks were cleaned regularly and fixedly. Doing so will inevitably cause some waste of resources.

Install septic tank ultrasonic level gauges in public toilets. The liquid level of the manure tank can be monitored in real time. It will automatically alarm when it reaches a certain height. The transmission system is connected to the control center. The front calls the police and the rear supports.

This can greatly save manpower and material resources. It is of great significance for energy saving, environmental protection and resource saving.

Septic tank ultrasonic level meter needs to be equipped with automatic alarm device or SMS alarm device. Ultrasonic module with 485 communication is used for liquid level monitoring. And through multiple communication modules with 485, the liquid level is monitored uniformly by the unified terminal system. This can not only display in real time. It is also possible to remind the user management personnel through a text message reminder or terminal alarm device when the septic tank is almost full.

Septic Tank Alarm Float Switch

The float level switch is specially used for liquid level detection of various medium and small normal pressure and pressure liquid storage tanks, remote transmission of on-site indicator signals, and liquid level alarm. It can be applied to various sanitary, toxic, corrosive media and explosive gas dangerous places. There are also many types of installation. Suitable for various forms of containers.

External Tank Level Indicator

The external tank level indicator is a new type of non-intrusive ultrasonic level measurement system. This is a real non-invasive, non-contact measurement method.

Just install the measuring probe on the outer wall of the bottom of the tank or container. The reflection and transmission characteristics of ultrasonic waves are used to realize the measurement of the liquid level inside the storage tank.

The calculated liquid level value is displayed locally, and a remote signal is output. The meter can output the measurement result to the control system through 4-20 mA analog signal, HART, RS-485 and other interfaces. At the same time, data can also be sent to the Internet via wireless transmission via WIFI, GPRS and NBIOT.

When the ultrasonic wave emitted by the probe propagates to the inner wall of the bottom of the container. The first reflected echo is generated due to the change of the propagation medium. After that, the ultrasonic wave continues to propagate in the measured liquid medium. When propagating to the gas-liquid interface, the propagation medium changes again. Produce a second reflection echo.

Assume that the time difference between the first reflected echo and the second reflected echo is T. According to the propagation speed c of the ultrasonic wave in the measured liquid. The liquid level value L =c*T/2 can be obtained in the container.

The advantage of this liquid level measurement method is that there is no need to open holes or install flanges for the container to be tested. The internal liquid level information can be obtained directly from the outside of the container. The non-intrusive liquid level measurement is truly realized.

Marine Holding Tank Level Indicator

Portable ultrasonic liquid level indicator is best choice for tanks or pipes level measurement. It is designed to measure the presence or absence of liquid at a certain height position in a tank or in pipelines. Non-contact ultrasonic detection technology. SI-ML works perfect for detection of dangerous toxic or corrosive liquids. Under ordinary conditions, the maximum wall thickness of measurable containers is 30mm. The product is suitable for the detection of various types of liquids. Liquids are non-crystalline or other particulate matter. For example CO2 Tank. Thanks to non-contact detection technology, this level indicator is ideal for detecting hazardous toxic or corrosive liquids.

How to Measure Ground Water Level ?

Dynamic monitoring of groundwater level:

It is advisable to use existing water wells, natural outcrops of groundwater, or drilling and exploratory wells in the project. When the borehole is easy to be blocked, a filter can be installed in the borehole for monitoring.

Deep Well water level sensor is to apply Hydrostatic Level Sensor to deep well. Well water level sensor submerged in deep well work together with submersible water pump. Range within 300m ～ 1000m.

The groundwater level online monitoring system is widely used in underground water deep well water level measurement, mine water level gauge deep well measurement, and geothermal well water level measurement.

The groundwater level online monitoring system is based on the principle of hydrostatic pressure in which the pressure is proportional to the water depth. The water pressure sensitive integrated components are used as the sensor probe of the deep well water level measuring instrument.

When the sensor probe is fixed at a certain measuring point underwater. The height of the water column pressure above the measuring point plus the height of the point. The water level (the distance from the water surface to the wellhead) can be measured indirectly. The direct measurement is above the sensor probe The actual height of the liquid level in the deep well.

FOGRod

The FOGRod is a wastewater level sensor manufactured by Wastewater Level. Unlike most level sensors it has no moving parts, sensors or electronics in the wet well.

The FOGRod hangs in a wet well much like a float switch or ultrasonic transducer and connects to a Level Indicator Transducer (LIT) which mounts in your control panel. The LIT has 10 relays that correspond to 10 contacts on the FOGRod.

Frequently
Asked
Questions

We can install a liquid level sensor or liquid level alarm in the water storage tank.
Through the display of liquid level value or alarm of high and low liquid level. We can know when the tank is full.

Ultrasonic externally attached oil level sensor uses the principle of ultrasonic echo ranging. The sensor is installed outside the bottom of the fuel tank and sends out an ultrasonic signal from the bottom, which is reflected by the oil surface, and then calculates the height of the liquid level according to time and speed. At the same time, combined with digital signal processing technology, it overcomes the influence of the container wall and realizes high-precision non-contact measurement of the liquid level in the container, which can meet the requirements of industrial applications in terms of application.

Including water dispensers, water heaters, toilets, humidifiers, etc., and other atomizers, coffee machines, beverage machines, electric steamers and other household appliances, medical and commercial machines, etc., all have water tanks inside.

Many machines cannot directly see the liquid level of the internal water tank. Therefore, a liquid level sensor is needed to detect the liquid level. Generally, detecting low liquid level can give a signal alarm when it is detected that there is almost no water. When a high liquid level is detected, a signal is given to prevent liquid overflow.

Water level sensors work by using sensor probes to indicate water levels in a storage tank. These probes send information back to the control panel to trigger an alarm or indicator. As mentioned above, the control panel can be programmed to automatically turn on your pump to refill the water again.

Tank level sensors monitor the level of liquids, pellets, powders, and other similar products in tanks and process systems. Available sensors include contact, non-contact and submersible sensors, as well as float and rotating paddle level switches.

Sino-Inst offers over 50 Wastewater Level Sensors/Systems for Sewage-Wastewater. About 50% of these are Radar level meters, 40% is magnetic level sensor.

A wide variety of Wastewater Level Sensors for Sewage-Wastewater options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Wastewater Level Sensor/System for Sewage-Wastewater instrumentation, located in China.

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Extended reading: Radar Water Level Sensor Applied To River/Reservoir Monitoring

Water Level Monitoring Sensor/System for Sewage-Wastewater

Posted on December 8, 2021 by KimGuo11

Water Level Monitoring Sensors can be used to detect changes in water level. The Water Level Monitoring Sensor and other control equipment work together to form the Water Level Monitoring System. The Water Level Monitoring Sensor/System is used to monitor the discharge of industrial wastewater and urban sewage. This is the development direction of smart cities. Let’s talk about Water Level Monitoring Sensor/System for Sewage-Wastewater in detail below.

RFQ More Level Sensors

Level monitoring

By installing a drop-in liquid level monitoring box at the head of the sewage well. Real-time monitoring of liquid level data of sewage wells. The monitoring data is uploaded to the platform through wireless communication. The cloud platform recognizes anomalies based on data statistical algorithms.

When the liquid level exceeds the set alarm threshold, the system will send an over-limit alarm. Notify relevant personnel to start the pump to drain water. When the level detector has equipment failure. Record the fault alarm. Notify relevant personnel to inspect the equipment.

Extended reading: Float Level Sensors – Single and Multipoint

Surface Water Level Monitoring is suitable for the water department to monitor the surface water level. At the same time, it supports remote image monitoring. Provide accurate and timely on-site information to ensure proper water storage and safe flood season.
It is helpful for the Water Affairs Bureau to grasp the current situation of water resources in the region, the use of water resources, strengthen the recovery of water resources fees, and achieve the purpose of correct evaluation, reasonable dispatch, and effective control of water resources.

Remote monitoring function. It can remotely monitor real-time data such as water level, rainfall, field equipment operating status, equipment voltage and so on.
Remote control function. The opening/closing of the reservoir valve can be remotely controlled in the center according to the height of the on-site water level to maintain the normal water level.
Image monitoring function. An external camera can be connected. Live photos can be taken. The photos can be uploaded to the monitoring center. The staff on duty can understand the situation on the spot without leaving home. Support regular and manual photos.
Automatic alarm function. It will automatically alarm if the water level exceeds the limit, the rainfall exceeds the limit, the equipment fails, and the door is opened abnormally.
Automatic statistics function. According to historical data, automatic statistics into daily reports, monthly reports, annual reports, etc.. Generate analysis charts according to customer needs.
Data storage function. The monitoring center and the field terminal can store historical data bidirectionally. It can store not less than 10 years of historical data.

Scope of application:

River water level monitoring. Real-time monitoring of the water level of the river provides a basis for decision-making.
Lake water level monitoring. The required information can be extracted by uploading real-time water level conditions.
Water level monitoring of the reservoir. Real-time monitoring of the water level in the reservoir is convenient for timely water replenishment and does not affect production and life.
The upstream and downstream water level monitoring of the reservoir. The water level changes of the upper and lower water levels can be reflected through the water level gauges of various manufacturers.
Rainfall monitoring in the reservoir area. Rain gauge measurement is used as the basis for rainfall and rainfall intensity in the reservoir area.
On-site picture monitoring of the reservoir. Industrial cameras upload on-site pictures of the reservoir area.
Monitoring of the infiltration line of the dam of the reservoir. Observe the position of the infiltration line of the dam body by embedding a piezometer.
Monitoring the seepage pressure of the dam foundation of the reservoir. The seepage pressure distribution of the dam foundation is reflected by the embedded piezometer.
Reservoir dam displacement monitoring. Accurately understand the horizontal and vertical deformation of the dam surface.

The river water level monitoring system is suitable for the water management department to remotely monitor the water level, rainfall, and other real-time data of the river basin. At the same time, it supports remote image monitoring. It provides accurate and timely on-site information to ensure proper water storage and safety in the river basin.

The river water level monitoring system achieves real-time monitoring of water and rain conditions and realizes the information management of the river. It has played a major role in protecting people’s lives and property safety.

System Overview

The river water level monitoring system is an important method for real-time control of river water regime changes, scientific early warning of flood disasters, improvement of flood control command capabilities, and reduction of rain and flood disaster losses.

System functions

Real-time monitoring of river water level, can expand rainfall, water quality, flow rate monitoring.
Support remote camera or video real-time monitoring (depending on the communication method).
When the water level exceeds the limit, the sensor fails, and the battery voltage of the monitoring terminal is low, the alarm will be immediately alarmed.
Automatically generate water level process curve and data statistics report.
It can be linked with the drainage pump station to automatically control the start and stop of the drainage pump group according to the water level of the river.
Supports docking with other comprehensive monitoring application platforms through OPC, database and other forms.

System Features

Strong compatibility: Compatible with various types of water level gauges such as ultrasonic, radar, float, laser, bubble, and drop-in type.
Flexible form of power supply: According to site conditions, it can be flexibly selected to supply power to the equipment by means of city electricity, solar energy, batteries, etc.
Various communication methods: support GPRS, CDMA, NB-IOT, short message, Beidou satellite, 3G/4G, WIFI, ADSL/optical fiber and other communication methods.

Extended Reading: GWR Level Sensor for High Temperature & High Pressure

The water level control switch is a feedback liquid level position signal. It informs the center console of the duty room whether the water level has reached the specified water level. It can also control the startup or shutdown of related equipment (such as water pumps). The signal voltage is often a safety voltage of 12V or 24V.

Water Level Control Sensor Switch is widely used in industrial boilers, civil construction pools, water towers, water tanks. As well as open or closed storage tanks in petrochemical, paper, food, sewage treatment, and other industries. Level measurement of various liquids in underground tanks. The tested medium can be divided into various conductive and non-conductive liquids such as water, oil, acid, alkali, industrial sewage, and so on. It forms a set of advanced liquid level display and control equipment with the electric valve, which automatically opens and closes the electric valve.

Extended reading: RF Admittance Level Sensor

Tank level sensor is a common sensor for measuring liquid level position. It converts the height of the position into an electrical signal for output. The liquid level sensor is a modular circuit. It has the advantages of acid resistance, moisture resistance, shock resistance, and corrosion resistance. The circuit contains a constant current feedback circuit and an internal protection circuit. The maximum output current can be made to not exceed 28mA. Therefore, the power supply can be reliably protected and the secondary meter is not damaged. In general, it is used in electrical appliances and equipment that require water level control.

We can divide Water Level Sensors into two categories by measuring whether they are in contact with the water level.

One type is contact type. Including single flange static pressure/double flange differential pressure level transmitter, float type level transmitter, magnetic level transmitter, input type level transmitter, electric internal float level transmitter Sensors, electric float level transmitters, capacitive level transmitters, magnetostrictive level transmitters, service level transmitters, etc.

The second category is non-contact. Divided into the ultrasonic level transmitter, radar level transmitter, and so on.

Extended Reading: Chilled Water Flow Meter

Ultrasonic liquid level Sensor adopts an ultrasonic pulse-echo method to realize liquid level measurement. Specifically, the transducer (probe) of the ultrasonic liquid level Sensor sends out high-frequency ultrasonic pulses. When it encounters the surface of the liquid level to be measured, the sound wave is reflected back. Part of the reflected echo is received by the transducer (probe) and converted into an electrical signal. The user can know the water level almost in real-time based on the reflected signal.

When choosing a water level measuring instrument, it is recommended to measure the ultrasonic liquid level Sensor here. It adopts microprocessor program control technology and intelligent signal processing technology. The measurement is efficient and accurate.

The protection level of the whole machine is as high as IP66/IP67, which can effectively prevent dust from inhaling, and can be immersed in water for a short time. At the same time, the probe is made of high explosion-proof grade (Ex d IIC T6 Gb) and PVDF material. It is very suitable for applications in harsh and noisy outdoor environments with corrosive liquids, harsh working conditions, and strong interference.

In addition, the ultrasonic liquid level Sensor has a variety of ranges to choose from. The longest can be measured at 15 meters. Very suitable for long-distance detection and tank level detection.

In addition to the use of ultrasonic level Sensors for water level monitoring. Users can also use radar, depth water level sensors, and other technologies to monitor the water level. Instead, use an ultrasonic liquid level. It is a liquid-level measuring instrument with a low maintenance cost and wide application range at present. Users can accurately obtain all required data. And with high-cost performance, it is favored by the majority of users.

Extended reading: Hydrostatic Level Measurement

Featured Water Level Monitoring Sensors

Wastewater/sewage pipe network flow and liquid level online monitoring solution

The online monitoring system for the flow and liquid level of the drainage/sewage pipe network is an important part of the intelligent drainage construction in Anhui. Through this system, the management department can globally grasp the operating status of the drainage pipe network, effectively identify the silting pipe section, and discover the abnormality of the manhole cover in time. In order to quickly respond to flood prevention and protect residents’ travel safety.

On-site monitoring equipment composition:

Well monitoring RTU: battery-powered, IP68 waterproof RTU
Water level detection equipment: drop-in level gauge (ultrasonic level gauge and other level gauges can also be used)
Manhole cover status detection equipment: travel switch (limit switch)

**Extended Reading: 3 inch (3″) Water Flow Meter**

System implementation instructions

1) The limit switch is installed under the manhole cover. When the manhole cover was closed, it just touched the contact of the travel switch. When the manhole cover is moved, the contact state of the limit switch changes. Such as from “open” to “closed”. And output this state change signal to the manhole monitoring RTU through the cable.

2) The probe of the throw-in water level gauge is installed at the bottom of the manhole and fixed firmly. Real-time detection of water level data in the manhole. And output the data to the manhole monitoring RTU through the cable.

3) Under normal circumstances, the well monitoring RTU regularly (time interval can be set) transmits the status and water level data of the well cover to the monitoring center through the GPRS/CDMA/4G/NB-IoT network. When the state of the manhole cover changes or the water level data exceeds the preset alarm value. The well-monitoring RTU reports alarm information to the monitoring center in real-time.

4) The center’s drainage pipe network monitoring system software dynamically displays the water level data and manhole cover status of each manhole. It provides query, statistics, and analysis functions, and prompts alarm information in various forms such as pop-up windows, prompt sounds, and short messages.

System functions

Monitor the water level of the wells at the important nodes of the pipeline network, and detect the siltation and blockage of the pipeline network in time.
Monitor the status of the manhole cover, and immediately alarm when the manhole cover is lost or displaced.
Provide timely warning information on the operation of the pipeline network to provide a decision-making basis for emergency flood prevention work.
Diagnose the bottleneck pipe section in the drainage pipe network, and provide a basis for the pipe network transformation.
Provide analytical data for evaluating the drainage capacity of low-lying and flood-prone areas.
Trace the historical status of the pipeline network operation to assist in accident analysis.

Extended reading: Radar Level Sensor Working Principle

Water Level Sensor Working Principle

The function of the water level sensor is to detect the water level. The water level sensor is widely used in electrical appliances and industrial equipment that require water level control. The water level sensor can realize the function of water shortage protection.

Principle of water level sensor:
The water level sensor has a sensor. Transform the sensed water level signal into a current signal.

Extended reading: Capacitive water level sensor

Frequently
Asked
Questions

If it is just an ordinary tank or well water level measurement. Then our first choice is the hydrostatic pressure submerged liquid level sensor. Also called hydrostatic level sensors.

Because of its lowest cost. Installation, use and maintenance are very simple.

Extended reading: Float Switch Water Level Controller

There are many kinds of sensors that can measure the water level. Or, it can be said that almost all types of liquid level sensors can be used to measure the water level.

Accurately measure the water level. In turn, the water level can be better controlled within the allowable range. It is of great significance to ensure safety and improve economic efficiency.
for example:
Many types of equipment in thermal power plants need to maintain a normal water level in order to operate safely and economically.
For example, boiler drum water level, deaerator water level, steam turbine condenser water level, high and low-pressure heater water level, etc.

Extended Reading: FMCW Radar for High Temperature Level Sensor

Extended Reading: Wireless Water Meter

Sino-Inst offers over 50 Water Level Monitoring sensors/Systems for Sewage-Wastewater. About 50% of these are Radar level meters, 40% is magnetic level sensor.

A wide variety of Tank Level Gauges & Indicators for Water Level Monitoring sensors/Systems for Sewage-Wastewater options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Water Level Monitoring Sensor/System for Sewage-Wastewater instrumentation, located in China.

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Technical Support Level Sensors

Tank Level Gauges & Indicators

Posted on October 19, 2021 by KimGuo11

Tank level gauges are instruments used to indicate and control the height of the liquid level in the tank. Commonly used in water storage tanks, oil storage tanks, and underground tanks. Tank level gauges are also often called Tank level Indicators or liquid level sensors. They are mainly for the level of liquid in the tank. There are many types of Tank level gauges supplied by Sino-Inst. Including floating ball, magnetic, radar, ultrasonic, and hydrostatic pressure, etc.

You may have heard a lot of sayings, tank level gauges, tank level sensors, and tank level transmitters. Next, we will briefly introduce them.

The tank level gauge is a kind of level meter used to measure the low and high levels of the liquid level. The position of the measured liquid medium in the container (including tanks, storage tanks, and spherical tanks). Liquid level. The meter that measures the liquid level has been changed from a “liquid level gauge” to a “level gauge”. Level gauges include tuning fork level gauges, float level gauges, magnetic flap level gauges, drip level gauges, radar level gauges, and so on.

Extended reading: Industrial Tank level indicators and Tank Level Gauges

Extended reading: Ultrasonic liquid level sensors

The liquid level transmitter has a further function than the liquid level gauge and the liquid level sensor. For example, when the float moves up and down with the liquid level. An electrical signal will be generated in a metal tube. However, this electrical signal is often irregular in size and cannot even be used for future circuits. For this reason, a circuit was installed near the pipe. The purpose is to convert this non-standard electrical signal into a standard electrical signal (such as 4-20MA, 0-10V, etc.). It can be output to other instruments or devices for display or control. This device is called a “level transmitter”.

Extended reading: GWR Corrosive Liquid Chemical Level Sensor

Although, tank level gauge, tank level sensor, and tank level transmitter are essentially different. But people are used to mixing these terms. Therefore, our tank level gauges below also include level sensors and transmitters.

Featured Tank Level Gauges

Tank Level Gauges Types

No.	Gauge type	Main features	Disadvantage	Installation method	Price
1	Ultrasonic level gauge	No direct contact with the medium, only the gas phase part. Read more about: Ultrasonic Tank Level Sensors for Tank Level Monitoring	The accuracy is relatively low. It is not possible to measure pressure vessels. Cannot measure volatile media.	Top installation, the device needs to be cut	Medium
2	Radio Frequency Admittance Level Gauge	Measurable interface	It is not easy to calibrate. The measuring medium must not be vicious. Otherwise, the probe hanging material will affect the measurement accuracy	Hole on the top of the device	Medium
3	Magnetic flap level gauge	Intuitive and easy to install	The magnetic ball gets stuck easily. Make it impossible to transmit instructions remotely	To connect to the device, need to open a hole	Low
4	Differential pressure level gauge	Wide range of popularization, easy to calibrate	It is closely related to the change of medium density. When measuring corrosive media, the material requirements of the instrument diaphragm are very high.	The device needs to be opened	Lower middle class
5	γ-ray level gauge	Non-contact measurement with medium, high accuracy	Nuclear radiation is harmful to the human body and is not suitable for large diameter containers	The device does not need to open holes	Higher
6	Float level gauge	Indirect contact with the medium, the floating ball has strict requirements for sealing	Cannot measure viscous media	Hole on the top of the device	Low
7	Externally attached liquid level gauge	Completely non-contact measurement. It can be used in harsh environments and is easy to install. Easy to maintain.	The viscosity of the medium is less than 10 mpa.s, and the medium cannot contain a lot of bubbles.	The device does not need to open holes	Medium
8	Magnetostrictive level gauge	High-precision measurement. Large range measurement. The liquid level and interface can be measured at the same time. Suitable for oil-water mixing measurement.	If the medium is in direct contact, the floating ball sealing requirements must be strict, and the viscous medium cannot be measured.	The device needs to be opened	Upper middle class
9	Hydrostatic pressure level gauge	High measurement accuracy; easy installation; signals can be transmitted remotely and remotely; It can resist the corrosion of various media by choosing different materials; it is suitable for explosion-proof occasions;	The measurement signal needs to be converted; the density of the measurement medium must be uniform	The device needs to be opened	Low
10	Radar level gauge	The measurement accuracy is high and the application range is wide.	When there are obstacles such as stirrers and pipelines in the storage tank, these obstacles will also reflect electromagnetic wave signals, thereby generating false liquid level signals.	The equipment needs to be opened	Higher
11	Guided wave radar level gauge	Guided wave radar level gauge is not limited by the dielectric constant; the measurement of the fluctuating medium is more stable	Not suitable for measuring corrosive and adhesive liquids, nor suitable for occasions with high food grade requirements	The equipment needs to be opened	Higher

Extended reading: Radar Oil Tank Level Sensor

The float level gauge is designed based on the Archimedes buoyancy principle and magnetic coupling. With its simple structure, easy operation, good reliability, high accuracy, and low consumption. It is commonplace in industrial applications and is quite popular.

It is widely used in the industrial measurement and control of the liquid level of various liquid tanks such as dam (reservoir) water level detection, sewage treatment, petrochemical raw material storage, food and beverage, and underground storage of gas stations.

When using the float level timer, you should choose different materials to adapt to it according to the chemical properties of the liquid.

Depending on the density of the liquid, different floats can be selected to match it to achieve the best measurement accuracy.

A magnetic Level Gauge is also called a magnetic level indicator. Magnetic Level Gauge is developed based on the principle of buoyancy and magnetic effect. The magnetic float in the measuring cylinder drives the two-color turning column on the external display of the measuring cylinder to flip with the increase (decrease) of the liquid level to be measured. As the position of the float changes, the indicator moves up and down the same amount. Supports top-mounted and side-mounted. It can be used for liquid level detection in high temperature, low temperature, high pressure, strong corrosion, highly toxic and dangerous environments.

Extended reading: fuel tank liquid level sensor 4-20ma

The glass tube level gauge is equipped with connecting flanges on the upper and lower valves of the instrument. The flange joint is welded with the container under test to form a communicating device. Therefore, the height of the medium level in the container can be directly displayed on the glass tube.

Safety steel balls are installed in the upper and lower valves of the glass tube level gauge. When the glass tube is broken due to an accident. The steel ball can block the passage under the action of the working pressure of the container. This way the valve will automatically seal. To prevent the medium in the container from continuing to flow out.

The lower end of the glass tube level gauge is equipped with a sewage valve. It is used for sampling, flushing or draining residual liquid by operators during normal production.

The glass tube level gauge is suitable for the measurement of the liquid level in various storage tanks, tanks, towers, and other containers in the petrochemical industry.

The purely mechanical structure has no electronic components. There will be no instability of electronic liquid level products. Therefore, operating costs are lower. At the same time, it is more reliable than the electronic type. Magnetic flap level gauges, glass tube level gauges, glass plate level gauges, buoy level gauges, etc., are all mechanical liquid level display instruments that are currently used in the domestic market. They are widely used in petroleum, metallurgy, chemical, papermaking, and other industries.

Compared with the electronic level gauge, the biggest feature of the mechanical level gauge is that the internal structure is very simple and the counting is intuitive. A variety of materials are available, which can be anti-corrosion and explosion-proof, and can be adapted to various installation environments.

Common Applications of Tank Level Gauges

It can be said that almost all types of level gauges can measure the level of the water storage tank.

You can choose the appropriate level gauge according to your own installation method, accuracy requirements, installation requirements, cost budget, etc.

Read more about Water level sensor Solutions

Diesel fuel tank level gauges for industrial oil storage tanks are very important, for level monitoring. Can be divided into mechanical and electronic.

Diesel tank gauges are installed onto industrial diesel tanks. It is used to directly or indirectly measure the liquid level of oil and other media. for the purpose of monitoring fuel consumption or reserve. They are often combined with a diesel tank alarm. This can effectively detect and control diesel fuel consumption.

Magnetic Level Gauge/Indicator

Posted on October 12, 2021 by KimGuo11

What is a magnetic type level gauge?

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Level Sensors

The parts and components of Magnetic Level Gauge are made of 304, 321, 316L, 1Cr18Ni9Ti, 00Cr17Ni14Mo2, 0Cr18Ni9, 304 or 0Cr18Ni9 lined with PTFE (polytetrafluoroethylene), PVC, PP, and other materials. And imported high-quality electronic components. The product has high reliability, good stability, long-lasting durability, and strong corrosion resistance.

Its characteristics are very significant:

Simple structure, Sturdy and reliable, durable, almost no maintenance workload, can be installed and used outdoors for a long time;
The measured medium is completely isolated from the display part of the level gauge, the level sensor, and the magnetic switch;
Wide working pressure range, withstand pressure from vacuum to 42MPa. The lowest density can reach 0.45g/cm3;
Wide operating temperature range, suitable for -190~+425℃;
Not affected by the physical and chemical state of the measured medium. Such as the medium’s conductivity, dielectric constant, foam, pressure, temperature, evaporation, boiling, bubbles, etc. It is widely used in various strong and weak corrosive, flammable and explosive. Toxicity, strong radioactivity, agitated, dirty liquid level, and interface measurement;
Optional single-pole single-throw (SPST), single-pole double-throw (SPDT) passive bistable magnetic switches. Realize high and low liquid levels, interface control, or alarm. The number of magnetic switches is not limited.
Optional reed pipe liquid level sensor, magnetostrictive liquid level sensor, capacitive two-wire liquid level sensor. Output 4~20mADC (or with HART protocol) signal. Realize remote centralized measurement and control.
The two-wire liquid level sensor can be equipped with LED digital display, which is convenient for night observation.

Installation form content		Side-mounted	Top-mounted
Installation spacing	Stainless steel	500～5000(mm)	500-2500(mm)
(Survey range)	ABS、PP-R	500～4000(mm)
Work pressure		0.6,1.6,2.5,4.0MPa	0.6,1.6,2.5MPa
Media density		＞0。6g/c	＞0.76g/c
Fallan Connection	Stainless steel	Farange 20-40 (DN20 PN1.0-4.0) (GB9119-88)	Farange 200-25 (DN200 PN1.6) (GB9119-88)


	ABS	Farange 20-10 (DN20 PN1.0) (GB9119-88)	Farange 200-6 (DN200 PN0.6) (GB9119-88)


Main material		ICr18Ni9Ti, ABS, PP-R (working pressure of 0.6MPa)
Medium temperature		-40～100℃(ABS、PP-R：-40～80℃)
Environmental temperature		-40～+70℃
Schematic error		±100mm
Medium viscosity		≤1st(10-4 /s)
Upper and lower limits Switch output		1, control sensitivity: 10mm 2, output connector capacity: AC220V 2A 3, connection life: 5 × 104 times 4, explosion-proof characteristics: iaIICT4 essential safety type



Electric teletransmission and continuous display		1, accuracy:±1.5% 2, Output load: 750 Ω 3, output signal: 4~20mA output, 24V DC second-line system 4, explosion-proof characteristics: iaIICT4 essential safety type

In order to meet the needs of different occasions, environments, and functions, Magnetic Level Gauge can add the following options:

Optional single-pole single-throw (SPST), single-pole double-throw (SPDT) passive bistable magnetic switches to achieve high and low liquid level, interface control or alarm. The number of magnetic switches is not limited.
Optional two-wire magnetic liquid level sensor, output 4~20mADC signal, realize remote measurement and control,
Optional two-wire magnetostrictive or capacitive liquid level sensor, output 4 ~ 20mADC, to achieve high-precision, continuous measurement and control. Selection of the technological interface form of the level gauge.
The top and bottom structure of the level gauge are selected. Output 4~20mADC with HART protocol

Image source: https://instrumentationforum.com/t/magnetic-liquid-level-gauges-working-principle/5242

The Magnetic Level Gauge adopts the principle of the communicating device and is connected to the container through the gas-phase and liquid-phase connection flanges. According to the principle of buoyancy and magnetic coupling, the magnetic float in the measuring cylinder (that is, the communicating device) drives the two-color flipping column on the external display of the measuring cylinder to flip with the increase (decrease) of the liquid level to be measured.

When the liquid level rises, the magnetic float drives the turning column to rotate 180°, displaying red or green; when the liquid level drops, the magnetic float drives the turning column to rotate 180° in reverse, displaying white. The height of the red band (or green band) is the height of the measured liquid surface, which realizes the purpose of measuring and displaying the position of the measured liquid (interface) surface.

Each magnetic turning column is a two-color axial symmetric structure. The distance between the two magnetic turning columns is 10mm. White and red (or green) are used to indicate the gas phase and the liquid phase, and the red (or green) and white junctions It is the boundary between the liquid phase and the gas phase.

Magnetic Level Gauge can measure both the liquid level and the interface between two different density media.

Product standards: HG/T2742-1995, HG/T21584-95.
Flange executive standard: HG/T20592~20615—2009 (when the order is not specified)

The working principle of the magnetic level gauge is to communicate with the container, so the liquid level in the measuring chamber will be the same as the liquid level in the container. The measuring chamber is equipped with a float, and there is a magnet in the float.

The float with magnets will float on the medium, and the magnets in the float will rotate the flaps of the indicating rail. The float in the measuring tube is standard, there is no pressure, no magnetism, or mechanical guidance.

This structure makes the risk of the float lower than that of the standard pressurized float. When necessary, pressurized floats can be produced.

With the below-mentioned process conditions, it is possible to select a float that will float on the medium.

Medium
Density
Working pressure
Operating Temperature

Magnetic Level Indicators can be directly used to observe the level of the medium in various containers. It is suitable for liquid level indication in petroleum, chemical, and other industrial fields. The liquid level gauge has a simple structure, intuitive and clear observation, no blockage, no leakage, convenient installation, and simple maintenance.

Extended reading: RF Admittance Level Sensor

Magnetic Level Gauge can be widely used in petroleum, chemical, oil field, medicine, food, wine, and other industries.

Various liquid storage tanks, storage tanks, liquid storage tanks, reaction tanks, fermentation tanks, liquid ammonia storage tanks, ammonia separators, boiler drums, deaerators, drain boxes, return tanks, high and low-pressure heaters, condensers, Evaporator.

Measurement and display of the liquid level of the medium compatible with 304, 321, 316L, OCr18Ni9, 304 or 0Cr18Ni9+PTFE, 00Cr17Ni14Mo21Cr18Ni9Ti, PVC, PP, and other materials in other pressure vessels, and the interface of two different media.

There are a variety of installation forms for you to choose from, to meet the requirements of different occasions and environments.

Magnetic Level Gauge can be reliably used for liquid level detection in high temperature, low temperature, high pressure, strong corrosion, highly toxic, and dangerous environments.

Magnetic Float Level Switches & Sensors with Magnetic Reed Switches for Continuous Level Measurement.

Magnetic Float Level Sensor works with Reed Switch, is a continuous level sensor. SI-U04 Magnetic Float Level Sensor-Reed operates on a direct, simple principle. As the magnetic float rises and falls as liquid levels change. The magnetic field generated from the inside of the float drives the sealed reed switch installed in the stem. The stem is made of non-magnetic metal or strong engineering plastic.

Magnetic Float Level Sensor gets the liquid level signal, transfers it into digital current signal and switching signal. Generally speaking, there are two structures of magnetic floats. Besides, the Magnetic Float Level Sensor supports multiple mounting methods. Such as top-mounted, side-mounted. So SI-U04 Magnetic Float Level Sensor can be applied to a variety of tank level measurements.

Extended reading: Amazing Solutions for Continuous Liquid Level Measurement

Still have questions?

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More Featured Level Gauges/Indicators

Rigid Probe Magnetostrictive Level Transmitter

Integral flange Magnetostrictive level sensor

Digital Display Magnetostrictive liquid level sensor

Based on the product selection, we can determine the price of the level transmitter. Sino-Instrument is a manufacturer of level transmitters, so we offer the best price.
For example: The reference price of a differential pressure level transmitter is around USD 400.

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Get a Quote Radar Level Measurement

List of Radar Level Sensors

Posted on October 6, 2021 by KimGuo11

Non-contact radar level sensor

Radar level sensors are used for continuous non-contact level measurement of liquids or solids. And convert it into electrical signals. The radar level sensor emits high-frequency radio frequency pulses from its antenna. The pulse passes through the air gap. Reflects on a liquid or solid surface and returns to the antenna. The radar level sensor determines the flight pulse time and converts it to level height or distance. It can provide reliable liquid level measurement in difficult tanks with foam, steam, temperature or pressure, or liquid storage tank applications. Or dusty silos, silos, stockpiles, crushers, or transfer station applications. It contains 3-30 meters of grains, granules, powder, or aggregates.

List of Radar Level Sensors

Radar Level Transmitters – 120GHz

Series	SI-FMF11	SI-FMF12	SI-FMF13	SI-FMF15	SI-FMF21
Applicable medium:	Liquid	Liquid	Liquid	Liquid	Solid
Measuring range:	0.05m~30m	0.05m~35m	0.1m~100m	0.1m~35m	0.3m~150m
Antenna:	32mm lens antenna	42mm lens antenna	78mm lens antenna	78mm lens antenna	78mm lens antenna + purging (or without purging)
Accuracy:	±2mm	±2mm	±2mm (range below 35m) ±5mm (range between 35m-100m)	±2mm	±5mm
Medium temperature:	-40～80℃	-40～110℃	-40～110℃	-40～200℃	-40～110℃
Medium pressure:	-0.1～0.3 MPa	-0.1～1.6MPa	-0.1～0.3MPa	-0.1～2.5MPa	-0.1～0.3MPa
Signal output:	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus
Power supply:	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V
Shell:	Aluminum/plastic/stainless steel	Aluminum/plastic/stainless steel	Aluminum/plastic/stainless steel	Aluminum /Plastic /Stainless steel	Aluminum/plastic/stainless steel
Process connection:	G1½A / 1½NPT thread / flange ≥DN50	G2A thread/flange≥DN65	Flange ≥DN80	Flange ≥DN80	Flange ≥DN80

Radar Level Transmitters – 80 GHz

Series	LM78x0	LM78x1	LM78x2
Applicable medium:	For normal solid application	For liquid application	For large range solid application
Measuring range:	0.3 m ~ 60m	0.08m~30m	0.6m ~ 120m
Antenna:	Lens antenna/ anti-corrosive antenna / flange isolated by quartz	Lens antenna/ anti-corrosive antenna / flange isolated by quartz	Lens antenna/ anti-corrosive antenna / flange isolated by quartz
Accuracy:	±1mm	±1mm	±1mm
Medium temperature:	T0:-40~85℃; T1:-40~200℃; T2:-40~500℃; T3:-40~1000℃	T0:-40~85℃; T1:-40~200℃; T2:-40~500℃; T3:-40~1000℃	T0:-40~85℃; T1:-40~200℃; T2:-40~500℃; T3:-40~1000℃
Medium pressure:	-0.1~2MPa	-0.1~2MPa	-0.1~2MPa
Signal output:	4 ~ 20mA or RS-485	4 ~ 20mA or RS-485	4 ~ 20mA or RS-485
Power supply:	15~28VDC	15~28VDC	15~28VDC
Shell:	Aluminum alloy, stainless steel	Aluminum alloy, stainless steel	Aluminum alloy, stainless steel
Process connection:	Thread or flange	Thread or flange	Thread or flange

Radar Level Transmitters – 26 GHz

Series	SIRD-901	SIRD-902	SIRD-902T	SIRD-903	SIRD-904	SIRD-905	SIRD-906	SIRD-908	SIRD-909
Applicable medium:	All kinds of corrosive liquid	Slightly corrosive liquid	Corrosive liquids, vapors, volatile liquids	Solid material, Strong dust easy to crystallize, condensation occasion	Solid material, Strong dust, easy to crystallize, condensation occasion	Solid particles, Powder	Hygienic liquid storage, Corrosive container	Rivers, Lakes, Shoal	Rivers, Lakes, Shoal
Measuring range:	10 meters	30 meters	20 meters	70 meters	80 meters	30 meters	20 meters	30 meters	70 meters
Antenna:	Sealing horn / PTEE	Horn Antenna Φ46mm/ Horn Antenna Φ76mm /Horn Antenna Φ96mm / Special Custom	Internal tapered rod antenna PVDF / 78mm Internal tapered rod antenna PFA / 78mm	Horn Antenna Φ76mm / Φ96mm / Φ121mm/Special Custom	Parabolic antenna Φ196mm /Φ242mm	Horn Antenna Φ76mm / Φ96mm / Φ121mm/Special Custom	Viton / (-40~130) ℃	Horn antenna with 76mm/ 96mm	Horn antenna with 76mm/ 96mm/ special custom
Accuracy:	± 5mm	± 3mm	±3mm	±15mm	±15mm	±15mm	± 3mm	± 3mm	± 10mm
Medium temperature:	-40℃~130℃	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃ ~ 130℃	-40℃ ~ 100℃	40℃ ~ 100℃
Medium pressure:	-0.1~0.3 MPa	-0.1 ~ 4.0 MPa	-0.1~2.0 MPa	-0.1~4.0 MPa (Flat flange) -0.1~0.3MPa (Universal flange)	-0.1 ~ 0.3 MPa	-0.1 ~ 4.0 MPa (Flat flange) -0.1 ~ 0.3 MPa (Universal Flange)	-0.1~4.0 MPa	Normal-pressure	Normal-pressure
Signal output:	4… 20mA /HART （2-wire / 4-wire） RS485/ Modbus	4… 20mA /HART（2-wire / 4-wire） RS485/ Modbus	4… 20mA /HART（2-wire / 4-wire） RS485/ Modbus	4… 20mA /HART （2-wire / 4-wire） RS485/ Modbus	4… 20mA / HART (2-wire / 4-wire ) RS485/ Modbus	4… 20mA /HART (2-wire / 4-wire ) RS485/ Modbus	4… 20mA/HART (2-wire / 4-wire ) RS485/ Modbus	RS485 / Modbus ( 6~24V DC) 4~20mA / Hart Two-wire ( 24V DC)	RS485 / Modbus ( 6~24V DC) 4~20mA / Hart Two wire ( 24V DC)
Power supply:	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V ）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	(6 – 24V) DC / Four-wire 24V DC / Two wire	(6 – 24V) DC / Four-wire 24V DC / Two wire
Shell:	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic /Single chamber	Aluminum / Plastic / Single chamber
Process connection:	Thread, Flange	Thread, Flange	Flange	Universal Flange	Thread, Universal Flange	Thread, Flange	Flange	Thread G1½ A″ /Frame /Flange	Thread G1½ A″ /Frame /Flange

Radar Level Sensors – 6 GHz

Series	SIRD-801	SIRD-802	SIRD-803	SIRD-804	SIRD-805	SIRD-806
Applicable medium:	Liquid, slightly corrosive liquid	Liquid, especially for corrosive liquid	Liquid, especially with pressure and Volatile Liquid	Solid particles or block material, And it is not suitable for solid powder	Liquid, especially suitable for low dielectric constant, sticky, with mixing liquid	Solid, especially suitable for high temperature conditions
Measuring range:	20m	20m	35m	35m	20m	15m
Antenna:	The Rod Antenna ( PP/PTFE )	The Rod Antenna (PTFE)	The Horn Antenna	The Horn Antenna	The Horn Antenna	The Horn Antenna
Accuracy:	±10mm	± 10mm	± 10mm	± 20mm	± 10mm	± 20mm
Medium temperature:	(-40 ~ 130) ℃	-40℃~130℃（Standard type） -40℃~180℃（High temperature type）	-40℃~130℃（Standard type） -40℃~250℃（High temperature type）	-40℃~130℃（Standard type） -40℃~250℃（High temperature type）	-40℃~130℃（Standard type） -40℃~250℃（High temperature type）	(-40 ~ 400) ℃
Medium pressure:	(-0.1 ~ 0.3) MPa	(-0.1 ~ 1.6) MPa	(-0.1 ~ 4) MPa	(-0.1 ~ 0.3) MPa	(-0.1 ~ 4) MPa	(-0.1 ~ 0.3) MPa
Signal output:	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART
Power supply:	Two-wire (DC24V) Four-wire（DC24V / AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）
Shell:	Aluminum /Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel
Process connection:	Flange (optional) / Thread	With PTFE plate flange	Flange (optional) / Thread	Universal joint flange	Flange	Flange

Radar Level Sensor Advantages and Disadvantages

Advantages of radar level measurement

Measurement is not affected by temperature, pressure, or dust
User-friendly adjustment saves time
Non-contact, continuous level measurement over larger ranges
Unaffected by sludge and biomass, dust, foam, oil, grease and other coatings, uneven surfaces, turbulence, pressure, and vacuum
Single-frequency radar level sensors for liquid sensing, dual-frequency radar level sensors for level measurement of aggregates, gravel, sand, coal, asphalt, and other solids
Simple mounting and push-button calibration

Disadvantages of radar level measurement

Very sensitive to build-up on the sensor surface.
They are very expensive. Price increases with accuracy.

Extended reading: Amazing Solutions for Continuous Liquid Level Measurement

Radar Level Sensor Working Principle

Electromagnetic waves propagate in the air at the speed of light. The distance between the radar level gauge and the surface of the material can be expressed by the following formula: 　　

D = (1/2)*CT

In the formula:

D ———the distance between the radar level gauge and the surface of the material; 　　

C ———Speed of light 　　

T ———Pulse time.

Then the liquid level is: 　　L = E-D

In the formula:

L — liquid level; 　　

E ———The total height of the tank; 　　

D ———Air height.

Radar Level Sensor Application

From the shape of the tank, Radar Level Sensor can measure the liquid level of spherical tanks, horizontal tanks, cylindrical tanks and cylindrical cone tanks.
As far as storage tank functions are concerned, Radar Level Sensor can measure the liquid level in storage tanks, buffer tanks, microwave tubes and bypass tubes.
From the measured medium, Radar Level Sensor can measure liquids, particles, slurries, etc.

Radar Level Sensor for Solids

Radar Level Sensor is widely used in the measurement of solid material levels in the industry. It has a good measurement effect for the working conditions of extreme dust and various interference factors that affect the measurement in the silo.

Material storage level detection in the mining industry. Level detection of silos such as coarse broken silos, fine broken silos and fine ore silos.
Storage level detection of materials in the coal industry. Including the level detection of raw coal silos, clean coal silos and other silos.
Material storage level detection in the cement industry. Including clinker warehouse, raw meal homogenization warehouse, raw material mixing warehouse, limestone storage warehouse, raw coal warehouse, cement mixing warehouse and other silo level detection.
Storage level detection of materials in the power industry. Such as the detection of raw coal silos, pulverized coal silos and dry ash silos in thermal power plants.

Radar Water Level Sensor

Radar Level Sensor is a level detection instrument using microwave technology.

It is mainly suitable for detecting the water level of natural waters such as rivers and lakes. It can also be used to detect the water level of large-scale reservoirs, reservoirs, sewers, and other open-air channels.

As a detection terminal, this product can effectively assist in monitoring water level changes and provide accurate water level information for monitoring units.

The product adopts the pulse radar detection method. It can work stably around the clock. The measurement result is accurate and reliable.

The non-contact detection method makes it more widely used. It can even be used in complex water environments with organic pollutants or sediments.

Ultrasonic vs Radar Level Sensor

What is the difference between Ultrasonic Level Sensor and Radar Level Sensor?

Ultrasonic Level Sensor and Radar Level Sensor are non-contact liquid level measuring instruments. As the name suggests, one uses ultrasonic waves and the other uses electromagnetic waves. In addition, what are the differences between ultrasonic level sensors and radar level sensors?

Ultrasonic Level Sensor

Ultrasonic Level Sensor is a digital level meter controlled by a microprocessor. In the measurement, the pulsed ultrasonic wave is emitted by the sensor (transducer). The sound waves are received by the same sensor after being reflected by the surface of the object and converted into electrical signals.

The distance between the sensor and the object to be measured is calculated from the time between the emission and reception of the sound wave.
Because of the non-contact measurement. The measured medium is almost unlimited. It can be widely used to measure the height of various liquid and solid materials.

Radar Level Sensor

Radar Level Sensor adopts the circuit design of a high-frequency microstrip line structure. The internal circuit generates microwave pulse signals.

Based on the design principle of the high-frequency waveguide, the microwave pulse is emitted from the end of the antenna through the PTFE emitter.

When the transmitted pulse hits the surface of the measured medium. Part of the energy is reflected back and received by the same antenna.

Through the principle of time extension technology, the time interval between the transmitted pulse and the received pulse is calculated. So as to further calculate the distance from the antenna to the surface of the measured medium.

Simply put:

The relative price of Radar Level Sensor is relatively high;
Radar Level Sensor has higher accuracy than ultrasonic;
The measuring range of radar is larger than that of ultrasonic;
When using Radar Level Sensor, consider the dielectric constant of the medium.
Radar Level Sensor has horn type, rod type and cable type. Compared with ultrasonic, it can be applied to more complicated working conditions;
Ultrasonic cannot be applied to working conditions such as vacuum, high steam content or foam on the liquid surface.

Extended reading: The Secret of Ultrasonic Level Measurement

Radar Level Transmitter Calibration

How do you calibrate the radar level transmitter?

Set up the guided wave radar level transmitter

HART communicator, power supply, and the multimeter are as below (see below calibration setup Diagram).

Check the configuration of the lower range value (0% level, 4 mA) and high range value (100% level, 20 mA).
Make sure that the inputted data is as per the datasheet.
For example, the lower range value is 10 inch and the high range value is 35 inches (both of it are measured from the bottom of the level transmitter probe)

Fill the level transmitter chamber with water up to the 0% level.
Read the level measurement in the transmitter LCD (or in the HART communicator). Set this condition as 0% level through the HART communicator.

Read the mA output of the transmitter by using a multimeter.
Adjust (if any) through the HART communicator so that the output of the transmitter (on the multimeter) is 4 mA.

Fill the level transmitter chamber with water up to 100% level.
Read the level measurement in the transmitter LCD (or in the HART communicator). Set this condition as 100% level through the HART communicator.

Read the mA output of the transmitter by using a multimeter.
Adjust (if any) through the HART communicator so that the output of the transmitter (on the multimeter) is 20 mA.

Frequently
Asked
Questions

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Radar level instruments measure the distance from the transmitter (located at some high point) to the surface of a process material located farther below in much the same way as ultrasonic transmitters – by measuring the time-of-flight of a traveling wave.

A guided wave radar level transmitter is also called a wave-guided radar level sensor. They can measure both levels and the interface between two media. Through probe rod or cable, complete level contact types continuous level measurement. Such as Coaxial Probe Guided Wave Radar Level Transmitter. This is different from ultrasonic level measurement, which is a non-contact measurement. A guided wave radar level transmitter is often used for tank level measurement. Including liquid and solid. Output 4～20mA/HART, so as to measure and control the level during production.

Extended Reading: Guided-wave radar (GWR) level transmitter working principle

Sino-Inst offers over 50 Radar level sensors for level measurement. About 50% of these are Radar level meters, 40% is the tank level sensor.

A wide variety of radar level meters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of radar level measurement instrumentation, located in China.

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Point Level Measurement Sensors

Posted on September 7, 2021 by KimGuo11

What is Point Level Measurement?

Point Level Measurement refers to the use of a point level sensor to detect the material level in a storage tank or silo. Also called point level Indicators, Controls, and Switches. This type of equipment is used when it is not necessary to measure every possible intermediate level. Just like in the case of continuous level measurement.

The point level sensor measures the preset level of liquid, mud, or solid media. And open or close the electrical contact at the desired set point. In some applications, sensors are also used to trigger pumps, valves, or other controls. To return the media to the preset level. Capacitive, ultrasonic, rotary, and vibrating liquid level switches are suitable for almost all applications from bulk solids to liquids and in between.

What is a point level sensor?

Liquid level measurement usually has two forms: continuous liquid level detection and point liquid level detection. In continuous level detection, the sensor continuously measures the level of liquid or solid in the tank. The point level sensor measures the preset level of liquid, mud or solid media, and opens or closes the electrical contact at the desired set point.

Point level sensor is also called liquid level switch, or liquid level controller. Point level sensor is used for point level detection. The sensor will detect the liquid at a certain point in the tank or chamber. Generally, this applies to processes that need to be managed at a high or low level.

Point level sensor is suitable for liquid, paste, powder, or bulk solid in a silo. You may encounter problems with property changes, turbulence, foam, vibration, or accumulation, but a wide range of sizes, installations and materials make inspection easy.

Common point level sensors, such as photoelectric level switch (SST sensor), horizontal float switch, vertical float switch, ultrasonic level sensor, tuning fork level switch.

Extended reading: Radar level sensor for solids – Dust solid level measurement

What is a continuous level sensor?

The continuous level sensor is designed to provide level detection through every point in the tank or chamber. This means that regardless of the liquid level, it can provide feedback across the entire range of the container. This is very useful for processes where knowing the level is always important and for applications that require increased accuracy.

Common continuous level sensors, such as submersible level sensors, ultrasonic level sensors, capacitive level sensors.

Media type (e.g. bulk, powder, liquid, paste, etc.)
Media properties (e.g. bulk density, conductivity, viscosity, etc.)
Input conditions (e.g. tank material, tank geometry, installation position, installations within the tank, etc.)
Process conditions (e.g. pressure, temperature, ambient conditions, explosion protection, hygiene requirements, etc.)

Extended reading: Applicaitons Of Magnetostrictive Level Transmitters

Point level sensor

A sensor designed for point detection will detect liquid at a certain point in the tank or chamber. Generally, this applies to processes that require high-level or low-level management.

In most cases, they act as switches when the tank level rises or falls to a certain level. This could be an alarm or a bonding device. Essentially, the sensor detects when the liquid has reached the desired point, and it acts as a switch to activate the necessary response.

Continuous level sensor

The continuous level sensor is designed to detect the level through every point in the tank or chamber. This means that it provides feedback regardless of the level and the entire container range. This is great for processes where the level is always important, and for applications that require increased accuracy.

Extended reading: Radar Oil Tank Level Sensor

Looking for a specific type or a custom continuous liquid level sensor? Sino-Inst offers High-quality Liquid level sensors for continuous level measurement.

Level sensors are used in process control in many industries and they fall into two categories. Continuous level measurement sensors and Point level measurement sensors. The point level measurement sensor is used to indicate a single discrete level, that is, to indicate a preset level.

The function of this type of sensor is the upper limit alarm, which indicates the overfill condition, or the lower limit alarm condition. Continuous level sensors are more complex, allowing level monitoring of the entire system. They measure the level of the liquid level in a range, not the level of a point. Continuous level sensors produce an analog output that is directly related to the liquid level in the container. To build a level measurement system, this output signal is transmitted to the process control loop and visual indicators.

Types of Point level measurement

Liquid level measurement is a key link to realize the automated production of industrial processes. According to the difference of its output, it can be divided into Point level measurement and continuous quantity measurement. A wide variety of liquid level switches have caused many obstacles to the correct selection of users. For this reason, the common classifications of liquid level switches are introduced as follows. Hope to be helpful to instrument users.

Extended Reading: What is level transmitter working principle?

After the probe of the capacitive liquid level switch is exposed to liquid, it detects the change of the capacitance value and outputs the contact signal. Generally speaking, capacitive liquid level switches have certain advantages in the measurement of slightly viscous media.

Extended reading: Capacitance level sensor advantages and disadvantages

The electrode type liquid level switch mainly uses the conductivity of the liquid to detect the height of the liquid level. Once the measured medium touches the pole, it will conduct electricity and detect the signal. After the signal is amplified by the controller, it will output a contact signal to realize the control of the liquid level.

The magnetic float of the float level switch rises or falls with the liquid level so that the sensor detects the reed switch chip at the set position in the tube. It sends out contact on/off switch signal. Due to the simple structure of the float level switch, it is economical and practical. It is widely used in the civilian market. But compared with industrial-grade products, its stability is relatively poor.

Extended reading: Oil-water interface measurement-Magtech magnetic level indicator

The photoelectric liquid level switch mainly uses the principle of light refraction and reflection. It is detected by infrared rays. Because the light will reflect or refract at the interface of two different media. When the measured liquid is at a high level, the measured liquid and the photoelectric switch A kind of interface is formed. When the measured liquid is at a low position, the air and the photoelectric switch from another interface. These two interfaces make the reflected light intensity received by the light-receiving crystal inside the photoelectric switch different. That is to say, there are two corresponding interfaces. Different switch states. Generally speaking, the applicability of photoelectric switches is poor compared with other measuring instruments.

Extended reading: Non contact level measurement

The instrument probe of the ultrasonic external liquid level switch emits ultrasonic waves and detects its after-vibration signal in the container wall. When the liquid flows over the probe, the amplitude of the after-vibration signal will become smaller. The instrument will output a signal after detecting the change Switch signal. Because the ultrasonic external liquid level switch is a non-contact measuring instrument, it is mostly used in the scene where it is not easy to open holes and high risk. But relatively speaking, its cost is relatively high.

Extended reading: The Secret of Ultrasonic Level Measurement

The tuning fork liquid level switch mainly outputs a switch signal by detecting the changes in the frequency and amplitude of the fork vibration. Its versatility is strong, but it is necessary to consult the manufacturer for working conditions with high viscosity. For working conditions that are easy to crystallize, it is not recommended.

Extended reading: Solid flow meter | For bulk solids-powder-soybean-cement

Featured Level switches for point level measurement

**Ultrasonic Oil Level Sensor-External Paste-Truck Fuel Tank**

**SI-LT Magnetostrictive level transmitter with Local Digital Display**

Extended reading: Ultrasonic Oil Level Sensor-External Paste-Truck Fuel Tank

Sino-Inst offers over 10 Point Level Measurement Sensors. About 50% of these are liquid level meters, 40% is the tank level sensor.

A wide variety of Point Level Measurement Sensors options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Point Level Measurement Sensors instrumentation, located in China.

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