SIRD-902T Microwave Radar Liquid Level Sensor

SIRD-902T Microwave Radar Liquid Level Sensor

Radar Liquid Level Sensor is an instrument that measures the height of a liquid and converts it into an electrical signal. Using time-domain reflectometry (TDR) sensing technology, Radar Liquid Level Sensor emits and receives high-frequency radio waves (microwaves) to measure the distance to the surface of liquid-based substances. Different from the ultrasonic and guided wave radar transmitter. SIRD-902T Microwave Radar Liquid Level Sensor is a self-heating microwave level sensor. Low-temperature resistance, heat tracing type, non-icing, and anti-crystallization. Suitable for corrosive liquids, steam, and volatile liquids.

Features of SIRD-902T Microwave Radar Liquid Level Sensor

  • The level sensor can be heated. It is resistant to low temperature, self-heating, does not freeze, and prevents crystallization.
  • Almost unaffected by corrosion and foam. Almost unaffected by atmospheric water vapor, temperature, and pressure changes.
  • The severe dust environment has little effect on the work of the high-frequency level meter.
  • The wavelength is shorter. It has a better reflection on the inclined solid surface.
  • The beam angle is small, the energy is concentrated, and the echo ability is enhanced, but it is also beneficial to avoid interference.
  • The measurement blind zone is smaller. Good results can also be obtained for small tank measurements.
  • High signal-to-noise ratio. Better performance can be obtained even under fluctuating conditions.
  • High frequency. It is a better choice for measuring solid and low dielectric constant medium.

Specifications of SIRD-902T Microwave Radar Liquid Level Sensor

Application:Temperature, pressure, slightly corrosive liquid
Measuring Range:20 meters
Process Connection:Thread, flange
Process  Temperature:-40~130℃(standard type) / -40~250℃(high temperature type)
Process Pressure:-0.1~2.0MPa
Protection Grade:IP67
Frequency Range:26GHz
Supply:Two-wire system (DC24V) / Four-wire system (DC24V/AC220V)
Signal Output:Exia ⅡC T6 Ga / Exd IIC T6 Gb
Outer Covering:Aluminum Single Chamber / Aluminum Dual Chamber / Plastic / Stainless Steel Single Chamber
Explosion-proof Grade:4…20mA/HART (two-wire/four-wire) / RS485 Mod bus
Antenna MaterialStainless Steel  /  PTFE

Radar Level Sensor Application

The measurable conditions of the 902T Radar Liquid Level Sensor are as follows:

  • Application: corrosive liquid, steam, volatile liquid
  • Measuring range: 20 meters
  • Process connection: flange
  • Medium temperature: -40~130℃ (standard type)/ -40~230℃ (high temperature type)
  • Process pressure: -0.1~2.0MPa

Read more about List of Radar Level Sensors

Radar Liquid Level Sensor Working Principle

The radar-level antenna emits narrow microwave pulses. Downward transmission via the antenna. After the microwave touches the surface of the measured medium, it is reflected back. It is received by the antenna system again and transmitted to the electronic circuit part to automatically convert it into a level signal.

Because microwaves travel so fast, the time it takes for electromagnetic waves to reach the target and return to the receiver by reflection is almost instantaneous.

A range setting
B Low adjustment
C high adjustment
D Blind zone range

The reference plane of the measurement is:
The bottom surface of the thread or the sealing surface of the flange

Note: When using radar level timing, make sure that the highest material level cannot enter the blind area of the measurement (the area shown in D in the figure).

Know more about Level measurement using radar technology

Radar Level Sensor Advantages and Disadvantages

Advantages of radar level measurement

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

Disadvantages of radar level measurement

  • Very sensitive to build-up on the sensor surface.
  • They are very expensive. Price increases with accuracy.
  • Foaming, splashing, vapor, and humidity can affect measurement performance.
  • Top mounting only
  • Minimal blocking distance limits operation when in proximity to liquid level
  • Longer blocking distance than ultrasonic
  • Radar passes through low dielectric constant fluids

Radar Level Sensor for Solids

SI-FMF15 FMCW Radar High-Temperature Level Sensor

Measuring medium: liquid and Solids
Measuring range: 0.1m~120m
Process connection: flange≥DN80
Process temperature: -40~200℃; -60~1200℃
Process pressure: -0.1~2.5MPa
Antenna size: 78mm lens antenna
Antenna material: PTFE/full filling

SI-FMF21 FMCW Radar Silo Level Sensor

Measuring medium: solid
Measuring range: 0.3m~150m
Process connection: flange≥DN80
Process temperature: -40~110℃
Process pressure: -0.1~0.3MPa
Antenna size: 78mm lens antenna + purging (or without purging)
Antenna material: PTFE

SIRD-903 26 GHz Radar level Sensor -Dust solid level measurement

Application: solid materials, strong dust, easy to crystallize, condensation occasions
Measuring range: 70 meters
Process connection: universal flange
Process temperature: -40~130℃ (standard type) / -40~250℃ (high temperature type)
Process pressure: -0.1~4.0 MPa (flat flange) -0.1~0.3 MPa (universal flange)
Accuracy: ±15mm
Protection level: IP67

SIRD-904 Radar Level Gauge with Parabolic Antenna

Application: solid materials, strong dust, easy to crystallize, condensation occasions
Measuring range: 80 meters
Process connection: threaded, universal flange
Process temperature: -40~130℃ (standard type) / -40~250℃ (high temperature type)
Process pressure: -0.1~0.3MPa
Accuracy: ±15mm
Protection level: IP67

SIRD-905 Horn Antenna Radar Tank Level Sensor

Application: solid particles, powder
Measuring range: liquid 35 meters / solid block 20 meters / solid powder 15 meters
Process connection: thread, flange
Process temperature: -40~130℃ (standard type) / -40~250℃ (high temperature type)
Process pressure: -0.1~4.0 MPa (flat flange) -0.1~0.3 MPa (universal flange)
Accuracy: ±15mm
Protection level: IP67

SIRD-804 Radar Solid Level Sensor

Applicable medium: solid particles or blocks, not suitable for solid powder
Application: Lime block measurement; raw coal measurement
Explosion-proof certification: Exia IIC T6 Ga/ Exd IIC T6 Gb
Measuring range: 35m
Antenna: Horn antenna
Frequency: 6 GHz
Process temperature: -40~130℃(standard type)/-40~250℃(high-temperature type)

SIRD-806 Radar High Temperature Level Sensor

Applicable medium: solid, especially medium measurement in a high-temperature environment
Application: Blast furnace level measurement
Explosion-proof certification: Exia IIC T6 Ga/Exd IIC T6 Gb
Measuring range: 15m
Antenna: Horn antenna
Frequency: 6 GHz
Process temperature: (-40~400)℃

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: FMCW Radar for High Temperature Level Sensor

Ultrasonic liquid level sensors are non contact level measurement devices. In the measurement, the ultrasonic pulse is sent by the sensor (transducer). The sound wave is reflected by the liquid surface and received by the same sensor or ultrasonic receiver. It is converted into an electrical signal by a piezoelectric crystal or a magnetostrictive device. It is transmitted and received by the sound wave. The time between the sensor and the surface of the liquid being measured. Due to non-contact measurement, the measured medium is almost unlimited. It can be widely used for measuring the height of various liquid and solid materials. Like: water level, fuel level, oil level, petrol tank level, and so on.

Extended reading: GWR Solid Level Sensor-Cement silo-Ash powder measure

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 a non-contact measurement. A guided wave radar level transmitter is often used for tank level measurement. Including liquid and solid. Output 4~20mA/HART, so as to measure and control the level during production.

Extended reading: GWR Solid Level Sensor-for Cement silo-Ash powder measure

Radar Level Sensor Price

The price of the radar level sensor is related to the medium, installation method, and pressure level.

  1. The medium is divided into ordinary type and anti-corrosion type. The cost of the ordinary type is relatively low, and the price of the anti-corrosion type is relatively expensive.
  2. The pressure levels are divided into 1.0MPA, 1.6MPA, 2.5MPA, 4.0MPA, 25MPA. The greater the pressure, the more expensive the price. So the pressure is directly proportional to the price.
  3. Every customer who has bought a radar level sensor knows that the installation method is different. Top-mounted and side-mounted. Because of the different structure, the top-mounted type is more expensive than the side-mounted type.

Sino-Inst provides customers with the most reasonable prices on the basis of ensuring product quality. Radar Level Sensor Price reference range: USD500-1500.00/pc

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

Featured Radar Water Level Sensors


Radar level measurement adopts the transmitting-reflection-receiving working mode. The antenna of the radar level sensor emits electromagnetic waves. These waves are reflected by the surface of the measured object. It is received by the antenna. The time from emission to reception of electromagnetic waves is proportional to the distance to the liquid surface. The radar level gauge records the elapsed time of the pulse wave. The transmission speed of electromagnetic waves is constant. The distance from the liquid surface to the radar antenna can be calculated. Thereby know the liquid level of the liquid surface.

A liquid level sensor is an instrument for measuring the height of a liquid and converting it to an electrical signal. The liquid level signal output can then be utilized by other instrumentation to display, monitor, log or control the liquid level.

The Water level sensor mainly has contact type and non-contact type. Different water level sensors have different working principles.
1. The first type is contact. Including single flange static pressure / double flange differential pressure liquid level transmitter, float type liquid level transmitter, magnetic liquid level transmitter, input type liquid level transmitter, electric inner float level transmission Devices, electric float level transmitters, capacitive level transmitters, magnetostrictive level transmitters, service level transmitters, etc.
2. The second type is non-contact. Divided into ultrasonic liquid level transmitter, radar liquid level transmitter, etc.

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

A wide variety of Microwave Radar Liquid Level Sensors options are available to you, such as free samples, paid samples.

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

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This entry was posted in Radar Level, Level Transmitters by KimGuo11. Bookmark the permalink.

About KimGuo11

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.