Radar Water Level Sensor | 4-20mA | RS485| 15m- 35m -85m -150m

Radar Water Level Sensor

Radar water level sensor is a commonly used water level monitoring device. By using radar beams to measure the distance between the water surface and the radar sensor, accurate monitoring of river water levels is achieved.

Our Sino-Inst radar water level sensors can be customized with 4-20mA or RS485 signal output. The measuring range is 15m-35m-85m-150m optional. It is widely used in various functional scenarios such as river, lake, water conservancy detection, drainage pipe network, hydrological station, agricultural irrigation, tide and so on.


  • Millimeter-wave radar has a maximum measurement accuracy of ±2mm and a minimum measurement blind zone of 0.1m;
  • Smaller antenna size satisfies measurements in more working conditions;
  • It has stronger penetrability and can be used normally even in the presence of adhesion and condensation;
  • The dynamic signal range is larger and the measurement of low dielectric constant media is more stable;
  • Multiple measurement modes, radar response time is less than 1S in fast measurement mode;
  • Upload alarm information when the water level exceeds the upper and lower limits (configurable);
  • Millimeter wave RF chips achieve a more compact RF architecture, higher signal-to-noise ratio, and smaller blind areas;
  • 5GHz working bandwidth enables the product to have higher measurement resolution and measurement accuracy;
  • Integrated lens design, compact size;
  • Low power consumption operation, life span is more than 3 years;
  • Supports Bluetooth debugging on mobile phones to facilitate maintenance work by on-site personnel;

Radar Water Level Sensor Technical Parameters

Measuring medium:Liquid (river water, sewage, etc.)
Transmission frequency:76GHz~81GHz
Measuring range:0.1 m ~15m~35m~65m~85m~150m
measurement accuracy:±1mm, ±2mm,
Beam angle:8°, 6°,3°
Power supply range:18-28 VDC
output method:4-20mA,RS485
Operating temperature:-40~85℃
shell material:PP/aluminum alloy/stainless steel
Antenna type:lens antenna
Protection level:IP67
Installation method:Bracket/thread
Center frequency:80GHz
Process pressure:-0.1~0.3MPa
Process connection:Default thread, flange ≥DN80/gantry frame

radar water level sensor working principle

Radar water level sensor series products refer to frequency modulated continuous wave (FMCW) radar products working at 76-81GHz. They are non-contact measuring instruments. It calculates the distance and position between objects by emitting radar signals and receiving reflected signals, and measuring the propagation time and wavelength of the signals.

radar water level sensor working principle

The general principle of frequency modulated continuous wave radar level meter is that the radar emits electromagnetic waves on the top of the tank. The electromagnetic waves are reflected by the medium and are received by the radar. The frequency difference δf between the received signal and the transmitted signal is in a certain proportion to the distance R from the medium surface: R=C (speed)*δf (frequency difference)/2/K (frequency modulation slope).

Since the speed of light C and frequency modulation slope K are known, the frequency difference δf can be estimated, and the distance R to the material surface at the radar installation location can be obtained. Then from the known total height, subtract the spatial distance from the radar to the water surface to the material surface (referred to as empty height), the height of water level-material level is obtained.

radar water level sensor Applications

  • Wastewater treatment: Wastewater treatment plants require constant monitoring of water levels to ensure proper operation, and radar water level gauges can play a role in this area.
  • Hydrographic measurement: Hydrographic measurement of rivers, lakes and other waters requires high-precision water level meters to monitor water levels, and radar water level meters have become a viable option.
  • Agricultural irrigation: Agricultural irrigation requires constant monitoring of water levels to regulate water flow. Radar water level meters can meet its needs for high accuracy, high range and anti-interference capabilities.
radar water level sensor Applications

Traditional Water Level Monitoring Technologies

Manual measurement:

Automatic water level monitoring cannot be achieved. Measurements are also not accurate and timely enough.

Ultrasonic water level meter:

Using ultrasonic measurement technology, it is a non-contact measurement and outputs analog signals or digital signals. This technology is non-contact measurement, easy to install, and is almost not restricted by external temperature, humidity and other environmental conditions. However, the measurement accuracy is low and is limited by environmental conditions such as external temperature and humidity. There must be no foreign matter between the object and the object to be measured.

Hydrostatic water level transmitter:

The input pressure water level gauge mostly adopts silicon piezoresistive core and outputs analog or digital signals to the outside. This technology was developed early, is mature, and has high measurement accuracy. However, the water level meter needs to be fixed underwater, making installation and subsequent maintenance troublesome.

Taken together, traditional water level monitoring technology will encounter problems such as low accuracy, difficulty in integration, complex installation, and vulnerability to external environmental influences in actual work.

Radar water level gauge is a new type of liquid level measuring instrument. It has many technical advantages that are incomparable with traditional water level measurement technology.


  • High-precision and remote non-contact measurement: Using radar water level gauges to achieve accurate measurement of river water levels avoids the manpower and safety risks involved in traditional water level gauge measurements.
  • Rich product forms: Users can customize the shell design in the module product form, and users can use it directly in the complete product form. Different product forms can meet the diverse needs of users.
  • Real-time monitoring and data collection: Real-time monitoring and remote data collection of water level and rainfall data are realized through data collectors and data transmission systems.
  • Remote monitoring and data sharing: industrial application standard 4-20mA, RS485 signal and other configurations. Through the data transmission system, remote monitoring and data sharing of river water levels and rainfall conditions are achieved, improving work efficiency and data processing capabilities.

More Featured Level Measurement

Radar Water Level Sensor uses radar beam technology to measure the distance from the water surface to the radar antenna by transmitting and receiving radar beams, thereby achieving accurate measurement of water level. Radar Water Level Sensor adopts a non-contact measurement principle and is not affected by water quality. It can achieve high-precision water level measurement and meet the needs of hydrological monitoring.

We at Sino-Inst supply Radar Water Level Sensors in various configurations. We support customization of the measuring range, and the output signal is 4-20mA | RS485 optional. Plastic material, stainless steel material optional. Effectively reduce the price of Radar Water Level Sensor. If you need to purchase Radar Water Level Sensor or have related technical questions, please feel free to contact us.

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    Radar Water Level Sensor|4-20mA|RS485| 15m- 35m -85m -150m

    Radar water level sensor is a commonly used water level monitoring device. By using radar beams to measure the distance between the water surface and the radar sensor, accurate monitoring of river water levels is achieved.

    Product SKU: Radar Water Level Sensor |4-20mA | RS485| 15m- 35m -85m -150m

    Product Brand: Sino-Inst

    Product Currency: USD

    Product Price: 289

    Price Valid Until: 2029-09-09

    Product In-Stock: InStock

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