DG-RPLM-L20 radar and hydrostatic composite level transmitter

The product employs a dual‑mode measurement system combining radar and hydrostatic sensing. At medium and low water levels, it leverages the radar’s non‑contact ranging capability to measure water level, effectively handling conditions involving water quality, particulates, and floating debris. At high water levels, it automatically switches to a hydrostatic sensor mounted at a higher position, using pressure to sense the water level and thereby addressing the issue of measurements falling into the radar’s blind zone. This composite sensor configuration simultaneously overcomes both the radar’s blind zone and the hydrostatic sensor’s susceptibility to clogging and atmospheric pressure effects, making it one of the most reliable measurement approaches available today. Moreover, the two sensor systems can cross‑calibrate each other, enhancing measurement stability. In particular, it performs exceptionally well in urban manhole‑level monitoring applications.

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Urban Underground Pipeline Monitoring Instrument

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产品描述

- Commodity name: DG-RPLM-L20 radar and hydrostatic composite level transmitter
Measurement principle

The product employs a dual‑mode measurement system combining radar and hydrostatic pressure. At medium and low water levels, it leverages the radar’s non‑contact ranging capability to measure water level, effectively handling conditions involving water quality, suspended solids, and floating debris. At high water levels, it automatically switches to a hydrostatic sensor mounted at a higher position, using pressure to sense the water level and thereby resolving the issue of measurements falling into the radar’s blind zone. This composite sensor design simultaneously addresses both the radar’s blind‑zone problem and the hydrostatic sensor’s susceptibility to clogging and atmospheric pressure effects, making it one of the most reliable measurement approaches available today. Moreover, the two sensor systems can cross‑calibrate each other, enhancing measurement stability. In particular, it performs exceptionally well in urban manhole‑level monitoring applications.

Key Features

Integrated design, suitable for rapid installation and maintenance of manholes.
It has good cost-effectiveness.
Three types of sensors: radar, static pressure, and electrical conductivity.
The host features an ABS housing, offering excellent corrosion and water resistance.
Atmospheric pressure self‑balancing algorithm, addressing the influence of atmospheric pressure on hydrostatic pressure measurements.
Equipped with horizontal beads for convenient on-site installation.
Built-in digital attitude sensor
Antenna: Available in standard and underground models.
Low self-discharge batteries enable devices to achieve longer battery life.

Application scenarios

Measurement of manhole water levels, river channel water levels, and canal water levels is employed in situations where external power supply is unavailable—for example, when connection to the municipal grid or a solar‑powered system is not feasible. Data are transmitted wirelessly to a server.

Technical Specifications

Water level accuracy: 0.2% FS ± 0.001 m
Water level resolution: 0.001 m
120G Radar: Range: 0.02–20 meters, customizable
Hydrostatic type: Measurement range: 0–5 meters, customizable.
Radar operating mode: FMCW
Host housing: ABS

Operating temperature: -10~70℃

Battery: Built-in lithium‑ion battery, non‑rechargeable, 76 Ah / 3.6 V DC, with a self‑discharge rate of no more than 5% per year.
Refresh: Factory default: measure once every 5 minutes and upload once; configurable.
NB-IoT battery life: 4 years under a test-and-transmit cycle of once every 5 minutes.
4G battery life: 4 years under the “5-minute test-and-transmit” operating condition.
Wireless breakpoint resumption: When the base station signal is interrupted, data is automatically saved and, once the wireless signal is restored, the timestamped data is resent.
Bluetooth (optional): BLE Low Energy 5.1, 150 meters in open space, sensitivity: -90 dBm, transmit power: +6 dBm,
Standby: 50 µA, Battery Life: -2%