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Home / Computer Hardware, Monitors & Peripherals / Hi-Link 79G Water Level Sensor LD7901B Millimeter Wave Radar Module Non-Contact

Attributes

Brand -
Category Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals
Origin -
Frequency Band 79 GHz Millimeter-Wave
Measurement Range 0.3 to 10 Meters
Accuracy Level ±3 Millimeters
Beam Angle 8 Degrees Narrow Beam
Communication Protocol RS485 Modbus RTU
Power Input 9-36V DC Wide Voltage
Ingress Protection IP68 Waterproof Rating
Operating Temperature -40°C to +85°C
Housing Material Corrosion-Resistant Aluminum
Mounting Type Flange or Bracket Mount

5 reviews

A

Anonymous

Apr 15, 2026

Rating: 4/5

Good sensor, setup takes time

Performance is great once configured. Documentation could be clearer regarding the Modbus address mapping, but support helped us out.

A

Anonymous

Mar 30, 2026

Rating: 5/5

Robust industrial grade

Withstood harsh weather conditions outdoors without any issues. The IP68 rating is legitimate. Highly recommend for outdoor water level projects.

A

Anonymous

Mar 11, 2026

Rating: 5/5

Highly accurate reading

Compared to our old ultrasonic sensor, this radar module is much more stable. Temperature changes do not seem to affect the measurement accuracy.

A

Anonymous

Feb 05, 2026

Rating: 5/5

Excellent integration

Connected easily to our PLC system via Modbus. Very satisfied with the response time and data reliability. Worth the investment.

A

Anonymous

Jan 30, 2026

Rating: 5/5

Perfect for tank monitoring

Installed this on our chemical storage tanks. The non-contact feature is a huge plus for safety and maintenance. Readings are consistent even with vapor presence.

5 FAQ

Q: What is the warranty period for this module?

A: We offer a standard 12-month warranty on all sensor modules covering manufacturing defects and performance issues.

Q: Is calibration required out of the box?

A: Minimal calibration is needed. The sensor is mostly plug and play, but you may need to set the tank height parameter for your specific application.

Q: Can it measure corrosive liquids safely?

A: Yes, since it is a non-contact sensor, the module does not touch the liquid, making it safe for corrosive or hazardous materials.

Q: What is the maximum cable length supported?

A: The standard cable is 5 meters, but it can be extended up to 20 meters without signal loss using proper shielded wiring.

Q: Does this work with foam on the water surface?

A: Yes, the 79GHz radar frequency penetrates foam effectively, ensuring accurate level measurement even in challenging conditions.

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