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80GHz Mmwave Sensor Water Sensor Radar Sensor 0.1-40m

The LDRR04M radar module is specifically designed for hydrological detection. This radar module adopts the FMCW mode, features a non-contact installation design, and is compact in size and structure.

1. High Precision Measurement

  • Accuracy: ±3mm

  • Resolution: 1mm

  • Range: 0.1 ~ 40m

2. Ultra-Compact & Lightweight

  • Dimensions: 45.2mm × 45.2mm × 1.3mm

  • Weight: 7g – easy to integrate into space-constrained systems

3. Ultra-Low Power Consumption

  • Operating current: 20mA @ 12V

  • Wide voltage range: 9–24V DC

4. Fast Startup & Flexible Output

  • Startup time: 100ms (fastest)

  • Refresh rate: 0.1 ~ 25 Fps (adjustable)

5. Robust Environmental Performance

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

  • Suitable for harsh outdoor and industrial environments

Main Parameters

Part number LDRR04M
Transmission frequency 77-81GHz
Output power 13-20dBm
Beam width (-3dB) Horizontal ±7°, Vertical ±5°
Working voltage 9-24V, typical 12V
Working current 20mA
Communication RS485
Baud rate 115200
Protocol ASCII/Modbus
Working temperature -45℃~+85℃
Refresh rate 0.1-25Fps
Overall dimensions (diameter x height) 45.2 x45.2 x 1.3mm
Weight Weight : 7g
Ranging range 0.1-40m
Measurement accuracy ±3mm
Resolution 1mm
Start-up time 100ms

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Application

It features high precision, low power consumption and strong anti-interference ability, and is suitable for water level monitoring in lakes, rivers, mountain floods, reservoirs, sewage networks, etc.

Can this module be used for solid material level measurement?
Yes. It can measure both liquid and solid levels, such as grain, powder, or aggregate in silos and hoppers.
Does it require a separate antenna or housing?
No. The module integrates a microstrip antenna and can be embedded directly into your own housing or radome.
How do I integrate this module into my existing system?
The module provides standard RS485 interface with ASCII/MODBUS protocols. Simply connect power (9–24V) and 485A/485B lines.
What happens if the module gets wet?
The module itself is not fully potted. It should be installed inside a waterproof enclosure for outdoor or high-humidity environments.
Can I adjust the measurement speed?
Yes. The refresh rate is configurable from 0.1 to 25 Fps via software commands.
Does it work through glass or plastic windows?
Yes, but signal attenuation will occur. Test with your specific material and thickness. Acrylic (PMMA) and polycarbonate work best.
What is the minimum detectable distance?
0.1 meters. There is a small blind zone very close to the antenna.
Can multiple modules operate near each other?
Yes. However, avoid pointing them directly at each other. Separate mounting locations or staggered timing can reduce interference.
Is there any configuration software available?
Yes. Contact us for the PC configuration tool and protocol documentation.
What is the typical lead time for samples?
Please contact our sales team for current sample availability and lead time.

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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