Featured External Tank Level Indicators for Sale

Difficulties Existing in Liquid Level Measurement in Industrial Storage Tank Industry

Most liquid fuels used in industry, such as liquefied petroleum gas, gasoline, diesel, lubricating oil and other refined oils, as well as liquid chemical gases. For example: liquid ammonia, liquid chlorine, are stored in a high-pressure airtight container. In the production process, in order to ensure the safety of production, it is necessary to regularly measure the liquid level of the remaining liquid in the closed container.

Because these liquids are flammable and explosive. Using the traditional liquid level measurement method will cause damage to the tightness of the container. Safety accidents such as liquid leakage are prone to occur. In particular, after the storage tank has been built and put into service. It is hoped that another principle that is different from the existing level gauge will be added, and a level gauge with a different principle will be used. It’s hard for businesses to choose.

Extended reading: What is a capacitive liquid level sensor?

No holes – No damage the tank – External Tank Level Indicator

In response to the above problems, we designed and produced a new type of non-intrusive ultrasonic liquid level measurement system – externally attached liquid level gauge. This enables a truly non-invasive, non-contact measurement method.

Simply mount the measuring probe on the outer wall of the tank or container bottom. The reflection and transmission properties of ultrasonic waves are utilized. 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 measurement results to the control system via 4-20 mA analog signal, HART, RS-485 and other interfaces. At the same time, the data can also be sent to the Internet through wireless transmission via WIFI, GPRS and NBIOT.

Extended reading: Diesel Tank Level Monitoring System

External Tank Level Indicator Applications

External Tank Level Indicator has a wide range of applications. Especially the liquid level measurement application of flammable, explosive, strong corrosive, toxic and harmful pressure vessel storage tanks is more prominent.

Medium:
Liquid chlorine, liquefied gas, liquid ammonia, hydrofluoric acid, propylene, vinyl chloride, ethylene oil, butane, chlorosilane, butadiene, C5, C4, ethylene oxide, butylene oil, silicon tetrachloride, refrigerant , liquid Australia, xylene, hydrochloric acid, nitric acid, lye, isopropanol, ethylene glycol, other media.

Industry :
Chlor-alkali, storage and transportation, petrochemical, refrigeration, coal chemical industry, oil refining, chlorination industry, fertilizer, pesticide, electric power, military, oil depot, liquid storage, and other industries.

Extended reading: level sensors for fuel tanks

Externally Attached Ultrasonic Oil Level Sensor – Trucks

Ultrasonic oil level sensor is an external sensor used to measure the liquid level height in tanks and containers.
The sensor uses the ultrasonic detection principle to measure the oil level（liquid level）, and then converts the measured height value into the oil volume value through intelligent processing, and then transmits the fuel volume data to the background supervision system through GPS to achieve the purpose of real-time monitoring of vehicle fuel consumption.

At present, the products are mainly used in the field of the Internet of Vehicles to monitor the changes in the internal oil level of the tank in real time, so as to realize the detection of fuel volume. It can be used to prevent oil theft, optimize operating costs, optimize driver driving behavior, assist statistical decision-making, etc. At the same time, this product can also be used in fields such as chemical industry, water conservancy, storage tanks and other fields with liquid level detection needs.

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

Related Blogs

Read more about: Common River Water Level Measurement Methods

Sino-Inst offers over 10 External Tank Level Indicators and transmitters for level measurement. About 50% of these are ultrasonic liquid level meters, 40% is the level switches.

A wide variety of External Tank Level Indicators and transmitters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of External Tank Level Indicators and transmitters instrumentation, located in China.

Request a Quote

Unique Technical Advantages of 80GHZ Radar Level Transmitter

80GHZ Radar Level Transmitter refers to frequency modulated continuous wave (FMCW) radar products operating at 76-81GHz. Four-wire and two-wire applications are supported. There are multiple models, the maximum range of the product can reach 120m, and the blind area can reach 8 cm.

Because the 80GHZ Radar Level Transmitter operates at a higher frequency. shorter wavelengths. So it is especially suitable for solid applications. The working method of transmitting and receiving electromagnetic waves through a lens. It has unique advantages in high dust and harsh temperature environment (+200℃).

80GHZ Radar Level Transmitter provides flange or threaded fixing, which makes installation convenient and easy.

The main advantages of 80GHZ Radar Level Transmitter are as follows:

• Based on self-developed CMOS millimeter-wave radio frequency chip. Enables a more compact RF architecture. Higher signal-to-noise ratio, smaller dead zone.
• The 5GHz operating bandwidth enables the product to have higher measurement resolution and measurement accuracy.
• The narrowest 3° antenna beam angle. Disturbances in the installation environment have less impact on the meter. Installation is more convenient.
• Shorter wavelengths and better reflection properties on solid surfaces. Therefore, there is no need for special use of universal flanges for aiming.
• Support remote debugging and remote upgrade. Reduce waiting time. Improve work efficiency.
• Support mobile phone Bluetooth debugging. It is convenient for on-site personnel to maintain work.

Extended reading: Non contact level measurement

Communication and debugging

The instrument can be debugged through the LCD in the field. It can also be debugged on the PC side with the optional host computer software.

The communication between the 80GHZ Radar Level Transmitter and the PC is as follows:

80GHZ Radar Level Transmitter Measurement Principle

The general principle of the FM continuous wave radar level gauge is that the radar emits electromagnetic waves on the top of the tank. And the electromagnetic waves are received by the radar after being reflected by the medium.

The frequency difference δf between the received signal and the transmitted signal is proportional to the distance R from the surface of the medium:

R=C (speed)*δf (frequency difference)/2/K (frequency modulation slope).

Because the speed of light C and the frequency modulation slope K are known.

The frequency difference δf can be estimated to obtain the distance R from the radar installation position to the material surface.

And then through the known total height of the tank. Subtract the spatial distance from the radar to the material surface (referred to as Empty height) to get the height of the material level.

Extended reading: Magnetostrictive Level Transmitter Working Principle

Terminology

Beam angle:
Beamwidth bounded by 3dB below the maximum value. The minimum beam angle of 80GHZ Radar Level Transmitter is 3°, as shown in the figure.

Distance Resolution:
Range resolution refers to the radar’s ability to distinguish between two objects that are very close together.

If the separation between the two objects is less than the range resolution of the level radar. Then the radar can only measure one distance value. This distance value is not equal to the distance value of any of the objects. It is a combination of the distance values ​​of the two objects.

The FM bandwidth of the 80GHZ Radar Level Transmitter is B=5.1GHz. Minimum distance resolution=C/2B≈3cm.

Measurement accuracy (Accuracy):
If there is only one object and this object has moved a small distance. Whether the level radar can detect distance changes. The indicator of how far a single object has moved is called accuracy.

The IF signal of the 80GHZ Radar Level Transmitter is analyzed by its own algorithm, and the measurement accuracy is 0.1mm.

Ambient temperature:
The temperature of the surrounding air in contact with the device enclosure.

Blind spot:
Refers to the measurement limit of the near end of the instrument, and the instrument cannot measure in the blind area.

dB (decibel):
Indicates the unit of signal amplitude.

Dielectric Constant (DK):
The ability of a dielectric to store electrical energy under the induction of an electromagnetic field. Often referred to as the relative permittivity.

The increase in the permittivity is directly proportional to the increase in the echo amplitude. The relative vacuum/dry air dielectric constant is 1.

Echo:
The reflected signal received by the radar.

Emission cone:
The extension of the antenna beam angle.

False echo:
Any echoes that are not generated by the desired target. Generally, false echoes are generated by obstructions in the container.

Multiple echoes:
The multiple reflection echoes appearing at the target echo distance may be 2 or 3 times.

Polarization:
Emitted electromagnetic wave properties, describing the direction and magnitude of the electric field vector that changes over time.

Range:
(1) Refers to the farthest measurement limit of the instrument
(2) Special, refers to the artificially set maximum distance. Outside this distance, the meter does not consider it when processing data.

Repeatability:
In the same test environment, measure the same reflective target multiple times to measure the deviation of the results.

Speed ​​of light:
Symbol C, the speed of electromagnetic waves. Includes electromagnetic waves and light in free space. The speed of light is 299,792,458 meters per second.

Threshold curve:
A time-varying curve that serves as a threshold beyond which echoes are considered valid.

Extended reading: Amazing Solutions for Continuous Liquid Level Measurement

Beam Angle

The beam angle is the beam angle when the radar wave energy density reaches half of its maximum value (3dB width). Microwaves emit signals outside the beam range and can be reflected by interference objects.

Lens antenna diameter	Φ32mmLens antenna	Φ42mmLens antenna	Φ78mmLens antenna
Beam angle	8°	6°	3°

The larger the antenna size, the smaller the beam Angle alpha, the less the interference echo will be generated.

For more accurate measurements, avoid installing any internal devices (such as limit switches, temperature sensors, bases, vacuum rings, heating coils, baffles, etc.) within the signal beam range.

Linear

Extended Reading: What is level transmitter working principle?

80GHZ Radar Level Transmitter Applications

80G high frequency radar level meter has the characteristics of high measurement accuracy, wide application range, non-contact measurement, etc. It can be widely used in material level and liquid level measurement of various highly corrosive and high dust media.

The 80GHz radar level meter can not only measure the liquid level, but also measure the solid material level. Including powder materials. It has a good application in different storage tanks. Process storage tanks (silo), reaction tanks, static storage tanks , Dome tank, flat-top tank, spherical tank, horizontal tank, stilling pipe, bypass pipe, tank with agitator.

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

Extended reading: Hydrostatic Level Measurement

More Featured Non-Contacting Radar Level Measurement

Read More about: List of Differences: Radar vs Ultrasonic Level Measurement

Related Blogs

Sino-Inst offers 80GHZ Radar Level Transmitters for level measurement.

A wide variety of 80GHZ Radar Level Transmitters 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

Material Level Monitoring

Level measuring instruments are industrial automation instruments that measure the liquid level and loading height of liquid and powdery materials. Measure the stacking height or surface position of solid materials such as lumps, granules and powders.

Material Level Monitoring is the measurement of the surface position of solid blocks or powders in a silo to understand the amount of material stored in the silo.

for example:
In thermal power plants, it is necessary to detect the position of coal lumps and pulverized coal in the raw coal hopper and pulverized coal bunker.

Featured Material Level Indicators

Cement Silo Level Measurement

Cement silo seems to be a simple supporting equipment for concrete mixing plant. In fact, it also contains many auxiliary devices. It is not just a simple silo. It also includes auxiliary devices such as dust collector, arch breaking device, pressure safety valve, Level meter, etc.

The material level meter is mainly used for automatic detection and control of the limit material level of various materials such as cement and fly ash. It is indispensable. What does it do?

The material level meter is a sensor used to sense the height change of the material in the container. It can continuously detect the height, volume and other values ​​of the material in real time and convey relevant information to the computer or display instrument.

In the concrete mixing plant, the cement silo is a closed material storage device. The user cannot intuitively understand the amount of powder in it. At this time, a material level meter is needed.

Simply put, the material level meter in the cement silo can accurately record the position of the material in the cement silo, which is convenient for management.

After understanding the function of the level meter, what are the characteristics of the level meter?

1. Anti-interference, ready to use:

Because there are no complicated electronic components and their amplifying circuit parts inside. Therefore, the level gauge is not subject to any electromagnetic wave interference. After installation, it can be used for a long time without any debugging and maintenance.

2. Super anti-shake performance design:

There are no false signals even when the material is flowing.

3. Shock resistance and anti-loosening structure design. Effectively avoid loosening and slipping of parts. High-quality stainless steel material is used to make it have excellent corrosion resistance and wear resistance.
4. The material level meter adopts contact measurement. The result is real, accurate and reliable. It can be installed horizontally, inclined and vertically. It is easy to install and use.
5. Material level display function:

Adopt long-life high-brightness indicator light. The material level display is intuitive and convenient.

6. Excellent measurement reproducibility and adaptability to environmental conditions:

That is, it is not affected by changes in material particle size, shape, specific gravity, medium, wall scale, adhesion, temperature, humidity, dust concentration, etc.

7. Double protection function:

The overload protection function prevents the blades from being damaged by excessive external force. The automatic protection function enables the material level device to be powered off when the rotation of the material blades is blocked in the silo, which protects the motor and effectively prolongs its service life.

Extended Reading: Silo/Bin material level measurement system

The Difference Between Material Level Indicator and Level Switch

First of all, the concept of Material Level Indicator and Level Switch is different.

Broadly speaking, Material Level Indicator is divided into two types: switch type and continuous type. It means that Material Level Indicator includes level switch.

In a narrow sense, the Material Level Indicator can detect the material level change in the container in real time, and can achieve continuous measurement. The material level switch only has the function of switching value, which can only monitor and control the point position, and cannot achieve continuous measurement.

Of course, in general, the instruments for continuous measurement use the naming method of Material Level Indicator. Most of the instruments for switching values use the naming method for level switches.

Secondly, the products covered by Level Switch and Material Level Indicator are different.

Divide from a narrow concept.

The material level switch mainly includes vibrating rod material level switch, resistance rotary material level switch, tuning fork material level switch, radio frequency admittance material level switch, etc.

Material Level Indicator mainly includes Ultrasonic Material Level Indicator, Radar Material Level Indicator, Ray Level Indicator, etc.

Related Blogs

Sino-Inst offers over 20 Material Level Indicators for level measurement. For detecting high, intermediate, or low levels of liquids, powders and free flowing granular solids stored in tanks, bins, silos or other containers. About 50% of these are Radar level meters, 40% is other tank level sensor.

A wide variety of Material Level Indicators options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Material Level Indicators instrumentation, located in China.

Request a Quote

Types of water level controllers

• Floating ball controller
• Reed water level controller
• Cable water level controller
• Electronic water level controller
• Capacitive water level controller
• Tuning fork water level controller
• Electrode water level controller
• Photoelectric water level controller

Extended Reading: Procurement Guide for Ultrasonic liquid level sensors

Featured Water level Control and Sensors

Related Blogs

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

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.

Read more about: Condensate Flow Meter-Steam Condensate Flow Meter|Types & Selection Guide

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

Related Level Measurement Blogs

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

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

More Featured Level Transmitters for Sale

Read more about: Working Principle Of High Temperature And High Pressure Capacitive Level

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

Featured Water Level Monitoring Sensors

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

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

On-site monitoring equipment composition:

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

System implementation instructions

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

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

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

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

System functions

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

Extended reading: Radar Level Sensor Working Principle

Water Level Sensor Working Principle

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

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

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

More level measurement solutions

Extended Reading: Wireless Water Meter

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

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

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

Request a Quote

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

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

Featured Tank Level Gauges

Tank Level Gauges Types

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

Read more about: How to Choose the Right Diesel Fuel Level Sensor ?

Sino-Inst offers over 50 Tank Level Gauges & Indicators for level measurement. About 50% of these are Radar level meters, 40% is the magnetic level sensor.

A wide variety of Tank Level Gauges & Indicators for level measurement options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Tank Level Gauges & Indicators instrumentation, located in China.

Request a Quote

List of Radar Level Sensors

Radar Level Transmitters – 120GHz

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

Radar Level Transmitters – 80 GHz

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

Radar Level Transmitters – 26 GHz

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

Radar Level Sensors – 6 GHz

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

Radar Level Sensor Advantages and Disadvantages

Radar Level Sensor Working Principle

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 Level Sensor Application

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

Radar Level Sensor for Solids

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

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

Radar Water Level Sensor

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

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

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

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

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

Ultrasonic vs Radar Level Sensor

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

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

Simply put:

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

Extended reading: The Secret of Ultrasonic Level Measurement

Radar Level Transmitter Calibration

How do you calibrate the radar level transmitter?

Set up the guided wave radar level transmitter

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

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

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

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

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

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

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

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

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

Request a Quote

What is a point level sensor?

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

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

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

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

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

What is a continuous level sensor?

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

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

Types of Point level measurement

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

Extended Reading: What is level transmitter working principle?

Featured Level switches for point level measurement

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

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

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

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

Request a Quote