Radar Level Transmitter

Radar level measurement can be perfectly suited for applications in all industries, both for measuring liquids and solids. Radar level transmitters are not only suitable for simple tanks, corrosive or aggressive media, but even for high-precision tank metering applications.

Apure is a leading manufacturer of radar level sensors, offering a wide range of models and options. Products range from guided wave radar level transmitters to non-contact radar level transmitters (both pulsed and FMCW). Transmitting frequencies range from 26 GHz to 81 GHz.

Working principle of radar level transmitter

There are two different principles of radar level meters.

Guided wave radar level transmitter

Guided wave radar level transmitter is based on the principle of time-domain reflection (TDR) as the basis of the radar level sensor, radar level meter electromagnetic pulse to the speed of light along the cable or probe propagation, when encountered on the surface of the medium to be measured, the radar level meter part of the pulse is reflected to form an echo and along the same path back to the pulse transmitting device, the transmitting device and the surface of the medium to be measured the distance between the pulse and the propagation time of the pulse proportional to the calculation of the height of the liquid level.

Non-contact radar level sensor

Non-contact radar level sensors are measuring instruments based on the time travel principle. The radar probe emits high frequency pulses and propagates them along the cable. When the pulses meet the material surface they are reflected back and received by the receiver inside the instrument and the distance signal is converted into a level signal.


  • Chemical
  • Petroleum
  • Pharmaceuticals
  • Papermaking

Radar level transmitter calibration

Firstly, the calibration of radar level transmitters needs to be carried out in real industrial environments, because environmental factors such as temperature, pressure, medium, etc. at industrial sites can affect the measurement results of radar level meters. Secondly, calibration of radar level meters requires the use of standardized equipment, such as standard liquid level meters or standard measuring drums. Before calibration, it is necessary to check whether the installation position and angle of the radar level meter are correct, and whether the antenna of the radar level meter covers the liquid surface.

Next are the specific steps for commissioning calibration. First, adjust the liquid level in the standard liquid level meter or measuring drum to a predetermined height and record the standard height value. Then, the radar level meter is aligned with the standard liquid level meter or measuring bucket for measurement, the measured value is recorded, and the standard height value is compared and analyzed. If the deviation between the measured value and the standard height value is large, it is necessary to recalibrate or adjust the installation position or angle of the radar level meter. Finally, through several measurements, comparative analysis and adjustments, accurate and reliable radar level meter weight measurement results are obtained.

Radar level sensor advantages and disadvantages


  1. Radar level meter is mainly composed of electronic control unit and antenna, no moving parts, no mechanical wear and tear, compared with the mechanical parts of the level measuring instrument has a longer service life. Truly maintenance-free.
  2. Radar level meter can be used for most of the level measurement of liquid level, the microwave emitted can pass through the vacuum, no need for transmission medium, by the atmosphere, steam, volatile fog in the tank of the influence of small.
  3. Adopting non-contact measurement, it is not affected by physical characteristics such as density and concentration of liquid level in the tank. Large measuring range, strong corrosion resistance.
  4. Convenient installation, low failure rate, easy maintenance, high precision, high reliability and other advantages.
  5. Adopting digital and analog two output modes, it can be configured as single or multiple units according to the bus type, and can be easily connected with the upper monitoring computer.
  6. Low radiation rate of the instrument, basically no harm to the surrounding environment and personnel.


  1. Compared with other liquid level measurement instruments, the price of radar level meter is higher
  2. Radar level meter can not measure the liquid level of metal, concrete and other materials made of containers
  3. The measurement range of radar level meter is limited by antenna size and process conditions.


  1. Different principles
    Ultrasonic level meter with sound waves, frequency of about 40KHZ or so; radar level meter with electromagnetic waves, frequency up to about 26GHZ.
  2. The use of different media temperature and pressure
    Ultrasonic level gauge can only be used for atmospheric pressure containers, the probe at the temperature can not be more than 80 ℃, the speed of sound waves by the temperature and pressure have a great impact. Radar level meter is electromagnetic The radar level gauge is electromagnetic wave, not affected by the vacuum, the medium temperature and pressure of the applicable range is also very wide.

Radar level transmitters use advanced radar pulse technology to provide accurate and reliable level measurement over a wide range of 25cm-15m. It can measure a variety of media such as water and powder.

±1 mm

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