801 Radar Level Sensor

Radar level measurement

Radar Level Sensor also called radar level transmitter,

are the indicating transmitter for liquid level.

Non-contact Continuous level measurement in liquids and solids with free space radar sensors

In continuous non-contact level measurement with radar,

the sensor sends microwave signals towards the medium from above.

Non-contact radar continuously measures the level of powders, granules, solids, or liquids in a vessel.

The surface of the medium reflects the signals back in the direction of the sensor.

Using the received microwave signals, the sensor determines the distance to the product surface

and calculates the level from it.

Pulse radar transmitters using a lower frequency are more commonly used in liquids,

and perform in diverse tank shapes and environmental conditions.

For usage in a wide range of applications,

be it in the simple water tank, in corrosive or aggressive media,

or high accuracy liquid level applications.

Radar Level Sensor Features

  • 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 sensor advantages and disadvantages

The advantages:

  • 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

The disadvantages

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

Sino-Instrument can offer you a better price for all kinds of Radar Level Sensor, for level measurement.

1. Working Principle of Non-Contacting Radar Level Sensors/Gauges (Unguided Wave)

Antenna system to launch and microwave receiving energy is a very low, very short pulse.

Radar waves travel with the speed of light.  

The running time can be through the electronic components are converted into a signal.

Measurement of this special time extension method can realize stable,

accurate in a very short period of time.

Even if the condition is very complex, the presence of false echo,

with the latest micro-processing technology and debugging software,

also can analyze the level echo accurately.

Operating Principle of Non-Contacting Radar Level Sensors/Gauges (Unguided Wave)
Operating Principle of Non-Contacting Radar Level Sensors/Gauges (Unguided Wave)

Microwave antenna to receive the reflected pulse,

and transmitted to the electronic circuit, a microprocessor to signal to process

to identify the micropulse generated on the material surface echo.

Echo recognition is completed by the pulse system,

the accuracy can reach the millimeter level.

From the material surface distance between D and T pulse is proportional to the time travel:

D=C×T/2

Where C is the speed of light

Because of the air tank is a known distance E, L:

L=E-D

By setting the empty tank height E (= zero),

the full height of F (= full scale) and some application parameters,

application parameters automatically make the instrument to measure the environment.

4 – 20mA with corresponding output.

2. Level measurement with Radar- Applications

6GHz radar level gauge is suitable for liquid, paste,

granule and block material level and non-contact measurement,

suitable for changes in temperature, pressure big;

there is an inert gas and volatile.

The measurement method of microwave pulse can work normally in the industrial frequency band range.

The beam energy is low, can be installed on all kinds of metal,

non-metallic container or pipe, no harm to human body and environment.

3. SI-80 series Radar Level Sensors

  • 801 Radar Level Sensor
801 Radar Level Sensor
801 Radar Level Sensor
  • Suitable for Medium: Liquid, slightly corrosive liquid
  • Suitable for Medium: Liquid, slightly corrosive liquid
  • Explosion-proof Grade: Exia IIC T6 Ga/ Exd IIC T6 Gb
  • Measuring Range: 20m
  • Frequency: 6 GHz
  • Temperature: (-40 ~ 130) ℃
  • Measurement Accuracy:  ±10mm
  • Process Pressure: (-0.1 ~ 0.3) MPa
  • The signal Output: (4 ~ 20) mA/HART
  • The Scene Display: Four LCD /Can be programmed
  • Power Source: Two-wire (DC24V)
  • Four-wire(DC24V / AC220V)
  • Repeatability: ± 1mm
  • Outer Covering: Aluminum /Plastic / Stainless steel
  • Connection: Flange (optional) / Thread
  • 802 Radar Level Sensor
802 radar level sensor
802 radar level sensor
  • Suitable for Medium: Liquid, especially for corrosive liquid
  • Explosion-proof Grade: Exia IIC T6 Ga/ Exd  IIC T6 Gb
  • Measuring Range: 20m
  • Aerials: The Rod Antenna (PTFE)
  • Frequency: 6 GHz
  • Temperature: -40℃~130℃(Standard type)
  • -40℃~180℃(High temperature type)
  • Measurement Precision: ± 10mm
  • Process Pressure: (-0.1 ~ 1.6) MPa
  • The Signal Output: (4 ~ 20) mA/HART
  • The Scene Display: Four LCD /Can be programmed
  • Power Source: Two-wire (DC24V)
  • Four-wire(DC24V/AC220V)
  • Repeatability: ± 1mm 
  • Outer Covering: Aluminum / Plastic / Stainless steel
  • Connection: With PTFE plate flange

  • 803 Radar Level Sensor
803 Radar Level Sensor
803 Radar Level Sensor
  • Suitable for Medium: Liquid, especially with pressure and Volatile Liquid
  • Explosion-proof Grade: Exia IIC T6 Ga/ Exd IIC T6 Gb
  • Measuring range: 35m                       
  • Aerials: The Horn Antenna
  • Frequency: 6 GHz                   
  • Temperature: -40℃~130℃(Standard type)
  • -40℃~250℃(High temperature type)
  • Measurement Precision: ± 10mm    
  • Process Pressure: (-0.1 ~ 4) MPa
  • The Signal Output: (4 ~ 20) mA/HART         
  • The Scene Display: Four LCD /Can be programmed
  • Power Source: Two-wire (DC24V)
  • Four-wire(DC24V/AC220V)
  • Repeatability: ± 1mm
  • Outer Covering: Aluminum / Plastic / Stainless steel
  • Connection: Flange (optional) / Thread
  • 804 Radar Level Sensor
804 Radar Level Sensor
804 Radar Level Sensor
  • Suitable for Medium: Solid particles or block material,
  • And it is not suitable for solid powder
  • Explosion-proof Grade: Exia IIC T6 Ga/ Exd IIC T6 Gb
  • Measuring Range: 35m
  • Aerials: The Horn Antenna
  • Frequency: 6 GHz
  • Temperature: -40℃~130℃(Standard type)
  • -40℃~250℃(High temperature type)
  • Measurement Precision: ± 20mm   
  • Process Pressure: (-0.1 ~ 0.3) MPa
  • The Signal Output: (4 ~ 20) mA/HART
  • The Scene Display: Four LCD /Can be programmed
  • Power Source: Two-wire (DC24V)
  • Four-wire(DC24V/AC220V)
  • Repeatability: ± 1mm
  • Outer Covering: Aluminum / Plastic / Stainless steel
  • Connection: Universal joint flange
  • 805 Radar Level Sensor
805 Radar Level Sensor
805 Radar Level Sensor
  • Suitable for Medium: Liquid, especially suitable for low dielectric constant, sticky, with mixing the liquid
  • Explosion-proof Grade: Exia IIC T6 Ga/ Exd IIC T6 G
  • Measuring Range: 20m
  • Aerials: The Horn Antenna
  • Frequency: 6GHz 
  • Temperature:  -40℃~130℃(Standard type)
  • -40℃~250℃(High temperature type)
  • Measurement Precision: ± 10mm    
  • Process Pressure: (-0.1 ~ 4) MPa
  • The Signal Output: (4 ~ 20) mA/HART        
  • The Scene Display: Four LCD /Can be programmed
  • Power Source: Two-wire (DC24V)
  • Four-wire(DC24V/AC220V)
  • Repeatability: ± 1mm                              
  • Outer Covering: Aluminum / Plastic / Stainless steel       
  • Connection: Flange
  • 806 Radar Level Sensor
806 Radar Level Sensor
806 Radar Level Sensor
  • Suitable for Medium: Solid, especially suitable for high-temperature conditions
  • Explosion-proof Grade: Exia IIC T6 Ga/ Exd IIC T6 G
  • Measuring Range: 15m
  • Aerials: The Horn Antenna
  • Frequency: 6GHz 
  • Temperature:  (-40 ~ 400) ℃
  • Measurement Precision: ± 20mm    
  • Process Pressure: (-0.1 ~ 0.3) MPa
  • The Signal Output: (4 ~ 20) mA/HART        
  • The Scene Display: Four LCD /Can be programmed
  • Power Source: Two-wire (DC24V)
  • Four-wire(DC24V/AC220V)
  • Repeatability: ± 1mm                              
  • Outer Covering: Aluminum / Plastic / Stainless steel       
  • Connection: Flange

3. Installation Guide of SI-80 Radar Level Sensors

3.1 SI-80 Radar Level Sensors Installation instructions:

Installation Guide of SI-80 Radar Level Sensors
Installation Guide of SI-80 Radar Level Sensors

The recommended position (2), the outer wall of the tank wall to install pipe shall meet the following,

from the tank wall best distance to tank diameter of 1/4 or 1/6,

the minimum distance from the installation of the tank wall as the measurement range of 1/10.

For example, the liquid level of storage tank 10m,

and the tank wall installs the minimum distance of 1m.

  • Cannot be installed above the feeding port (4).
  • Cannot be installed in the central position (3), if installed in the central, yield multiple false echoes, clutter echo will lead to real signal loss.
  • If you can’t keep the instrument and the tank wall of the tank wall distance, the medium will adhesion caused by false echo, when debugging instrument should be false echo storage.

Installation Guide of SI-80 Radar Level Sensors
Installation Guide of SI-80 Radar Level Sensors

The top conical tank level, can be installed at the top of the tank is intermediate, can guarantee the measurement to the conical bottom.

Installation Guide of SI-80 Radar Level Sensors
Installation Guide of SI-80 Radar Level Sensors

A feed antenna to the vertical alignment surface. 

If the surface is rough, the stack angle must be used to adjust the angle of Universal joint flange of the antenna to the alignment surface.

 (Due to the solid surface tilt will cause the echo attenuation, even Loss of signal.)

3.2 Tank installation instructions FOR
SI-80 Radar Level Sensors

Tank installation instructionsTank installation instructions
Tank installation instructions
  • In the signal beam, should avoid the following installation: Such as (1) the limit switch, temperature sensor.
  • Symmetric devices such as (2): vacuum ring, a heating coil, Baffle plate, etc.
  • If the tank (1) (2) interference object, should be
  • guided wave tube measurement.

Best installation options:

  • Antenna size: larger antenna, beam angle smaller, interfering echoes will be weaker.
  • Antenna adjustment: the antenna to adjust to the best measurement position.
  • Guided wave radar takes over: The installation of the waveguide is used to avoid disturbing the echo.

Tank installation ( 801, 802 )

A standard installation

Tank installation ( 801, 802 )
Tank installation ( 801, 802 )
  • The radar antenna cannot tilt to the tank wall.
  • In order to minimize temperature effect, at the junction of the butt joint flange must use the spring washer.
  • The rod antenna launching point must reach out to install the pipe.
  • The vertical placement of the rod antenna beam direction, don’t let the tank wall.

Tank installation ( 803 )

Tank installation ( 803 )
Tank installation ( 803 )

A standard installation

  • Horn antenna must be installed pipe
  • extends out, otherwise, should use the
  • antenna extension tube.
  • Horn antenna must be adjusted to the Vertical, don’t let the radar beam pointed to the tank wall.

Install short long antenna extension tube

Install short long antenna extension tube
Install short long antenna extension tube
  • When the horn length is less than the installation of tube length, tube using an antenna.
  • If the diameter of the horn tube diameter
  • greater than the installation, you will need
  • to increase meter elevation, extension tube.
  • The antenna and the extension tube needs to to be installed from inside the container.
  • Select the extension tube makes the instrument at least elevation 100mm.

3.3 SI-80 Radar Level Sensors Measurement of Wave Guide Tube

If there is an obstacle, such as a ladder, limit switches, heating equipment,

such as a stent within the range of the microwave beam emitted radiation will lead to measurement errors.

If affected, the need to add another waveguide measured.

Measurement of Wave Guide Tube
Measurement of Wave Guide Tube

Then measure the waveguide tube (or Bypass pipe) installed inside the container to avoid obstacles,

foam, liquid surface fluctuations and large impact on the measurement.

Note: 

Isobaric pore diameter 5 ~ 10mm.

Waveguide diameter of at least 50mm and the inner walls must be smooth.

Measuring only good mobility media, viscous media cannot be measured with a waveguide.

3.4 The bypass pipe installation FOR
SI-80 Radar Level Sensors

Installation of bypass pipe
Installation of the bypass pipe

If the sensor is installed in the bypass pipe, need to install the communication the part is higher than that of the by-pass pipe and the upper part of the container ≥ 500mm;

Bypass pipe at the bottom to be lower than the connecting part of the by-pass pipe and the bottom of the container  ≥300mm.

Radar installation site display unit and connected component parallel.

Schematic diagram of the bottom refraction board
Schematic diagram of the bottom refraction board

If the dielectric constant of the medium-small (< 4), part of the radar signal can penetrate the dielectric constant constant dielectric.

Echo signal when the tank bottom reflection signals when compared to the dielectric reflection of strong, at this time,

measurement error. In this case, can be at the bottom of the tank to install the refraction board will signal refraction.

3.5 Typical installation errors OF
SI-80 Radar Level Sensors

3.5.1 The conical tank cannot be installed above the feed port.

Note: outdoor installation should adopt sunshade.

Typical installation errors
Typical installation errors

① Correct

② Error rainproof measures   

3.5.2 The instrument cannot be installed in the arched or domed roof intermediate.

In addition, producing indirect echo is also affected by the echoes.

Multiple echoes can be larger than the real value of signal echo because through the top can concentrate multiple echoes.

So cannot be installed in a central location.

① Correct

② Error

3.5.3 There are obstacles affecting measurement needed reflection plate.

① Correct

② Error

3.6 Below is a schematic diagram of the echo signal:



Sino-Instrument also offer

Ultrasonic level sensor:

Ultrasonic Level Transmitters3
Ultrasonic Level Transmitters

Explosion-Proof, Mapping Software, 3″ (76.2 mm) Measuring Column

Series ULT Ultrasonic Level Transmitter provides reliable, accurate, non-contact measurement of liquid levels.

Radar level transmitter

Radar Level Transmitters, Non-Contact
Radar Level Transmitters, Non-Contact

Level measurement with radar;
radar type level transmitter, also called Radar level gauge.

Non-contacting radar is based on microwave technology,

which detects only surfaces that reflect energy.

Guided wave radar level transmitter
Guided wave radar level transmitter

Guided wave radar devices, also called wave guided radar level transmitter,

have no moving parts and require minimum maintenance.

They can measure both the level and the interface between two media.

Pressure level sensors

SI-PCM261 Submersible Pressure Transducer
SI-PCM261 Submersible Pressure Transducer

Submersible pressure transducer with 4-20mA output,

is normal submersible pressure transmitter for level measurement.

Sino-Instrument Hydrostatic submersed level transducers are sensors,

with an electrical transmission output for indication of liquid level.

SI-10 Liquid pressure sensor
SI-10 Liquid pressure sensor

The liquid level sensor also called a water pressure sensor, or water pressure transducer.

The SI-10 series pressure sensor provides exceptional levels of stability,

and other performance specifications,

in a wide variety of enclosures from submersible to differential styles.

Sino-Instrument offers over 50 Radar Level Sensors products.

About 50% of these are Submersible level Transmitter measurement, 40% are water meters,

and 40% are liquid level meters.

and ultrasonic level sensor.

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

Sino-Instrument is a globally recognized supplier and manufacturer of 
Radar Level Sensors , located in China.

The top supplying country is China (Mainland), which supply 100% of 
Radar Level Sensors respectively. 

Sino-Instrument sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.

Radar Level Sensors products are most popular in Domestic Market, Southeast Asia, and Mid East. 

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

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Radar Level Sensors
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