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

Related Blogs

Choose the Right Float Switch for Water Tank

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…

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

Boiler Drum Level Measurement is very important and necessary in major factories. Drum level is an extremely important control parameter. It is an important guarantee for the production of high-quality…

Tech Guide for Non-Contact Radar Type Level Transmitters

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…

Water Level Monitoring Sensor/System for Sewage-Wastewater

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…

Tank Level Gauges & Indicators

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…

Wastewater Level Sensor for Septic Tank-Sewage Holding Tank

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,…

Magnetic Level Gauge/Indicator

What is a magnetic type level gauge? A magnetic Level Gauge is also called a magnetic level indicator. Magnetic Level Gauge is developed based on the principle of buoyancy and…

List of Radar Level Sensors

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…

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

Please enable JavaScript in your browser to submit the form

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

Related Blogs

List of Radar Level Sensors

Magnetic Level Gauge/Indicator

What is a magnetic type level gauge? A magnetic Level Gauge is also called a magnetic level indicator. Magnetic Level Gauge is developed based on the principle of buoyancy and…

Tank Level Gauges & Indicators

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…

Water Level Monitoring Sensor/System for Sewage-Wastewater

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…

Wastewater Level Sensor for Septic Tank-Sewage Holding Tank

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,…

Tech Guide for Non-Contact Radar Type Level Transmitters

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…

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

Point Level Measurement Sensors

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…

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.

Request a Quote

Please enable JavaScript in your browser to submit the form

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

Related Level Measurement Blogs

PD Flow Meters Selection and Application | Oil-Liquid

What is PD flow meter? PD flow meters (positive displacement flow meters) are the only flow measurement technology that directly…

Tech Guide for Non-Contact Radar Type Level Transmitters

What Is Radar Type Level Transmitter? The Radar Type Level Transmitter is a kind of instrument that measures the liquid…

Wastewater Level Sensor for Septic Tank-Sewage Holding Tank

Wastewater level sensor occupies a large proportion in sewage treatment applications. It is used in almost all aspects of sewage…

Fuel Flow Meter for Boat-Selection & Application

Fuel Flow Meter for Boat refers to a flow meter dedicated to measuring marine fuel. There are many types of…

Guide for Digital Fuel Flow Meter

Digital Fuel Flow Meter is a flow meter dedicated to measuring fuel, diesel, gasoline, and petroleum. Digital Fuel Flow Meter…

Water Level Monitoring Sensor/System for Sewage-Wastewater

Water Level Monitoring Sensors can be used to detect changes in water level. The Water Level Monitoring Sensor and other…

The Myth of Ceramic Pressure Sensor

What is a ceramic pressure sensor? Ceramic pressure sensors are sensor diaphragms made of ceramic alumina (Al2O3). Ceramic is a…

Water Flow Measurement for Pipes and Open Channels

Water flow measurement is common in both industry and life. You may often hear about the use of electromagnetic flowmeters…

Static Pressure/Hydrostatic Pressure Transmitter

The Hydrostatic Pressure Transmitter measures the hydrostatic pressure exerted by a hydrostatic head. Use these hydrostatic pressure transmitters to measure…

Mechanical Water Flow Meters

Mechanical water flow meters refer to a type of flow meter suitable for clean water processes or applications. The working…

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.

Request a Quote

Please enable JavaScript in your browser to submit the form

PD Flow Meters Selection and Application | Oil-Liquid

Posted on January 14, 2022 by KimGuo11

What is PD flow meter?

PD flow meters (positive displacement flow meters) are the only flow measurement technology that directly measures the volume of fluid passing through the flow meter.
Rotating components within a high precision chamber capture the fluid. The rotational speed of the rotor is proportional to the flow rate. Rotation is caused by the flow of fluid. Mechanical flow meters rely on rotation to drive a magnetic coupling or direct gear train connected to a mechanical counter. Under the conditions of a given flow meter, the volume of this metering space is determined. Just measure the number of rotations of the rotor. The cumulative value of the volume of fluid passing through the flowmeter can then be obtained.

RFQ More Flowmeters

PD Flow Meters can be divided into oval gear flowmeters, scraper flowmeters, dual rotor flowmeters, rotary piston flowmeters, reciprocating piston flowmeters, disc flowmeters, liquid-sealed rotary drum flowmeters, etc.

Features of PD Flow Meters

Advantages

High measurement accuracy;
The installation pipeline conditions have no influence on the measurement accuracy;
Can be used for the measurement of high viscosity liquids;
wide range;
The direct-reading instrument can directly obtain the accumulation without external energy, and the total amount is clear and easy to operate.

Disadvantages

The structure is complex and the volume is huge;
The type, caliber, and working state of the medium to be tested are relatively limited;
Not suitable for high and low temperature occasions;
Most instruments are only suitable for clean single-phase fluids;
Generates noise and vibration.

Featured PD Flow Meters

**LCD display Oval Gear High Viscosity Flow Meter**

**High Temperature Oval Gear Flow Meter – Heating oil**

**Thermal insulation Oval Gear flow meter**

**Clamp Filling Oval Gear Positive Displacement Flow Meter**

PD Flow Meters are also known as positive displacement flow meters. It is mainly composed of measuring body and measuring part. The metering body consists of a shell and a movable body (rotor of the rotameter). The core part is the movable body, which is the moving part in the measurement process. Each measuring cavity formed by the movable body and the casing is a standard volume unit, which is used to measure the volume of the fluid to be measured.

Extended reading: Fluid flow meter types

The measuring part is actually a rotational speed or counting sensor. Magnetic material is embedded in the pinion extending out of one of the screws on the screw flowmeter. When the screw rotates, the sensor can identify the rotational speed of the screw through the magnetic effect. And convert it into a standard pulse signal or current signal. In this way, the flow can be directly displayed by the secondary instrument or collected and analyzed by the computer.

There are many types of positive displacement flow meters. They can be classified according to different principles. Usually, according to the structure of the measuring element, it is divided into rotor type, scraper type, rotary piston type, reciprocating piston type and diaphragm type.

Among them, the rotor type is the most commonly used. The common gear type, screw type, waist wheel type and egg wheel type flowmeter belong to the rotor type.

Extended reading: Positive Displacement Flow meter Technology

The interior of the positive displacement flowmeter is designed with a space that constitutes a certain volume. The rotor inside the flowmeter rotates under the action of the pressure of the fluid flowing from the inflow port.

With the rotation of the rotor, the fluid flows from the inflow port to the discharge port. At this time, during the rotation of the rotor, a certain volume space is formed between the rotor and the flowmeter housing. The fluid fills this space with the rotation of the rotor. It is continuously sent to the discharge port.

If the volume of the space is designed, the number of rotations of the rotor is measured. The volume given by the space can be obtained, thereby obtaining the volume of fluid flowing through.

Extended reading: Liquid mass flow controller

This fixed-displacement flow measurement method for positive displacement flowmeters can be traced back to the 18th century. It entered the stage of widespread commercial application in the 1930s.

In recent years, the sales of PD flow meters in some industrialized countries have exceeded 20%. In my country, it also accounts for about 20%. It is mainly used in the metering of petroleum-based media.

But because of its precise metering characteristics. In recent years, it has been rapidly expanded to chemical, food, medical and other sectors to accurately measure the total amount and flow of expensive media.

In the measurement of petroleum, an international standard (ISO/DIS 2714) for measurement systems using positive displacement flowmeters has been developed. Moreover, positive displacement flowmeters with high precision, long-term performance retention and high repeatability are also used as standard instruments for industrial flow measurement, calibrating and calibrating industrial instruments.

In short, due to the high accuracy of positive displacement flowmeters, they are often used to measure the flow of relatively expensive media. High viscosity media can be measured. Therefore, it is generally used for the measurement of high-viscosity liquids in petroleum, chemical, metallurgical and other industries.

Extended reading: How to choose a high viscosity flow meter?

Of course it is also suitable for measuring low viscosity liquid media. In addition, positive displacement flowmeters can also measure gases. At the same time, the installation of positive displacement flowmeter does not require the front and rear straight pipe sections.

Extended Reading: Liquid Turbine Flow Meter

The Sanitary Positive Displacement Flow Meter is made of stainless steel and is quickly connected by Tri-clamp. Can be used to measure viscous liquids in the food industry. Such as sweeteners, edible oil, palm oil, honey, fat, tallow, fat, syrup, molasses, etc.

Extended Reading: Fuel Flow Meters for Diesel-Marine fuel-Industrial oil

Extended Reading: Mechanical oil flow meter

Positive Displacement Flowmeter Selection

The manufacturer generally specifies the flow range according to the type of the measured medium (mainly different viscosity), use characteristics (continuous use or intermittent use) and measurement accuracy.

In order to maintain good performance and long service life of the flowmeter. It is recommended to select 80% of the maximum flow rate of the flow meter when the maximum flow rate is used continuously.

If the manufacturer does not clearly specify the flow range according to the type of medium and the characteristics of use. The maximum flow rate for intermittent use can be 100% of the upper flow limit.

When used continuously, the maximum flow rate of medium viscosity liquid is 80% of the upper flow rate of the flowmeter. The maximum flow rate of low-viscosity and high-viscosity liquids is 50% to 60% of the upper flow rate of the flowmeter.

The fundamental error of most positive displacement flow meters is ±0.5%. The basic error of the higher precision flowmeter is ±(0.1%-0.2%). The oval gear flowmeter can reach ±0.05%. The basic error of the lower precision flowmeter (such as the elastic scraper flowmeter) is ±(1.0%-1.5%).

The accuracy of a positive displacement flowmeter is the fundamental error obtained under laboratory conditions. In actual use, field conditions often deviate from laboratory conditions, resulting in additional errors. The actual error should be the sum of the basic error and the additional error. When selecting and using, measures should be taken according to the on-site situation to ensure the measurement accuracy.

Extended reading: Crude Oil Measurement – Radar Level Meter Measuring Vaulted Buffer Tank

Positive displacement flowmeters rely on the fluid to push the measuring fittings, so the pressure loss is high. The pressure loss of a positive displacement flowmeter is larger than that of other types of flowmeters of the same diameter and flow. The pressure loss of general liquids is 20 to 100 kPa.

When measuring liquids with high vapor pressure, excessive pressure drop will cause cavitation. If cavitation exists for a long time, it will damage the flowmeter accessories. Some flowmeters that allow short-term overflow to 120% of the upper limit of measurement should pay more attention to this problem .

Extended reading: Orifice Plate Flow Meter

Fluid corrosiveness is a major factor in determining flowmeter material.

For various petroleum products, cast steel and cast iron are used.
For slightly corrosive chemical liquids and cold water, it is made of copper alloy.
Made of stainless steel for pure water, high temperature water, crude oil, asphalt, high temperature liquids, chemical liquids, food or food raw materials.

The corrosion resistance of positive displacement flowmeters is generally not strong. In the food and biopharmaceutical industries, due to hygiene requirements, flow meters are frequently sterilized. Fittings that come into contact with fluids must be made of stainless steel and other hygienic materials. They must be easily disassembled.

Generally speaking, the viscosity of various gases is similar. It has no effect on the performance of the flowmeter. The viscosity of liquids is quite different.

In order to adapt to the liquid with high viscosity, the positive displacement flowmeter has a structure with a large gap.

Although the volume-second flowmeter is affected by viscosity, it is less affected than differential pressure and float turbine flowmeters. Viscosity generally affects the measurement error, pressure loss and flow range of positive displacement flowmeters.

Extended reading: Ultrasonic Flow Meters Types & Technical Guide

When the flowmeter is used at higher temperatures, the maximum working pressure rating must be reduced. Sudden valve opening and closing can create water hammer effect. Shock force may exceed operating pressure. Shock force may also cause false readings. Buffer tank may be installed if necessary.

Temperature will not only affect the compressive strength of the flowmeter, but also affect the measurement accuracy. Reduced structural clearance can jam moving parts. Therefore, when used at higher temperatures, a dimensional clearance should be reserved to compensate.

Especially when different materials are used in combination, pay more attention to the difference in thermal expansion coefficient.

Changes in temperature also change the viscosity of the liquid, causing flow changes. It can be corrected by automatic temperature compensation, and there must be a suitable preheating time before use, and observe whether it can operate normally.

Extended reading: Heating Oil Flowmeters

Usually the compressibility of liquids is negligible, however, compressibility should not be neglected when measuring oil with high accuracy.

For example, when the pressure of heavy oil rises from 0.5 MPa to 6 MPa, the volume is compressed by 0.45%. LPG is more compressible.

Gases are highly compressible, and their volume decreases at low pressures in proportion to pressure increases. Most positive displacement flow meters are used for low pressure conditions and can be directly converted.

However, under high pressure conditions, the volume reduction is not proportional to the pressure increase. The gas compressibility factor should be considered.

Extended Reading: Summary Of Crude Oil Flow Measurement Options

Extended Reading: Guide and Selection for Diesel Fuel Flow Meters

Sino-Inst, Manufacuturer for PD Flow Meters. For example: crude oil flowmeter, diesel flowmeter, gasoline flowmeter.

Sino-Inst’s PD Flow Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.

Extended reading: Hydraulic oil flow measurement solutions.

Request a Quote

Please enable JavaScript in your browser to submit the form

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.

Request a Quote

Please enable JavaScript in your browser to submit the form

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.

Request a Quote

Please enable JavaScript in your browser to submit the form