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80GHz Mmwave Sensor 0.1-40m Water & Liquid Level Gauge

LDRR04B millimeter-wave radar is a radar specifically designed for hydrological detection.

This radar adopts FMCW mode, features a non-contact installation design, is compact in size, has a tight structure, high precision, low power consumption and strong anti-interference ability.

1. High Precision Measurement

  • Accuracy: ±3mm

  • Resolution: 1mm

  • Range: 0.1 ~ 40m

2. Narrow Beam for Precise Targeting

  • Beam width: ±3° (horizontal & vertical)

  • Lens antenna provides superior focusing and minimizes interference

3. Ultra-Low Power Consumption

  • Operating current: 25mA @ 12V

  • Wide voltage range: 9–24V DC

4. Fast Startup & Configurable Output

  • Startup time: 100ms (fastest)

  • Refresh rate: 0.1 ~ 25 Fps (adjustable)

5. Robust Environmental Protection

  • Operating temperature: -45°C to +85°C

  • Waterproof rating: IP67 (default), IP68 (upgradeable with full potting)

Main Parameters

Part number LDRR04B
Measuring range
0.1~40m
Resolution 1mm
Beam width (-3dB) Horizontal ±3°, Vertical ±3°
Measurement accuracy ±3mm
Set-up time 100ms
Weight 212g
External dimensions (diameter x height) 66×96 mm
Refresh rate 0.1-25Fps
Emission Frequency 77-81 GHz
Mains power supply 9 V-24 V DC, typical 12V
Operating average current 25 mA
Output Power (EIRP) 13-20 dBm
Operating temperature range -45℃~+85℃
Output RS485
Baud rate 115200
Protocol ASCII/Modbus

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Application

It is applicable to water level monitoring in lakes, rivers, mountain flood warnings, reservoirs, sewage networks, etc.

  • Lake & river water level monitoring

  • Flash flood warning systems

  • Reservoir & dam water level measurement

  • Sewage network water level monitoring

  • Industrial liquid level measurement (tanks, containers)

  • Agricultural irrigation canal water level monitoring

  • Bridge & tunnel drainage monitoring

  • Underground pipe network water level detection

What is the measurement range and accuracy?
Range: 0.1 to 40 meters. Accuracy: ±3mm. Resolution: 1mm.
What is the main application of this radar?
Hydrological monitoring – lakes, rivers, flood warning, reservoirs, sewage networks, and water level monitoring.
What is the beam angle?
±3° in both horizontal and vertical directions (-3dB beamwidth).
What communication interface and protocols does it support?
RS485 with default baud rate 115200. Supports both ASCII and MODBUS protocols – freely switchable.
What are the power requirements?
9–24V DC, typical current 25mA.
What is the refresh rate?
Configurable from 0.1 to 25 Fps.
Is it waterproof?
Default IP67, upgradeable to IP68 with full potting for underground pipe network or long-term submersion applications.
What are the dimensions and weight?
Diameter: 66mm, Height: 96mm. Weight: 212g.

Technical Support & Custom Solution

We provide datasheet, dimension drawing, interface protocol, demo code and technical support.

Support sample test, ODM/OEM customized service, welcome global customers to inquire and cooperate.

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