DG-APLM-R-L10L5 Ultrasonic–Hydrostatic Composite Level Transmitter

The product employs a dual‑mode measurement approach combining ultrasonic and hydrostatic sensing. At medium and low water levels, it leverages the non‑contact ranging capability of ultrasound to detect 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 measure the water level and thereby overcoming the ultrasonic blind zone that arises under elevated conditions. This composite sensor design simultaneously addresses both the ultrasonic blind zone and the issues of clogging and atmospheric pressure influence inherent in hydrostatic measurements, making it one of the most reliable measurement solutions available today. Moreover, the two sensor systems can cross‑calibrate each other, further enhancing measurement stability. In particular, this system excels 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-APLM-R-L10L5 Ultrasonic–Hydrostatic Composite Level Transmitter
Measurement principle

The product employs a dual‑mode measurement approach, combining ultrasonic and hydrostatic sensing. At medium and low water levels, it leverages the non‑contact ranging capability of ultrasound to detect 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 measure the water level and thereby overcoming the ultrasonic blind zone that occurs at elevated levels. This composite sensor design simultaneously addresses both the ultrasonic blind zone and the issues of clogging and atmospheric pressure interference inherent in hydrostatic measurements, making it one of the most reliable measurement solutions 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

The hydrostatic sensor employs a weighted‑pendulum mounting, making it suitable for rapid installation and maintenance in manholes.
The host unit is equipped with an expansion bolt kit, enabling rapid installation at the wellhead.
The host features a stainless steel housing, offering excellent corrosion resistance, water resistance, and impact resistance.
Rigid sealing, unaffected by temperature fluctuations.
Supports multiple lid openings without compromising waterproofing, making on-site battery replacement convenient.
A color local display unit accessory can be optionally added.
Anti-condensation and backflow‑preventing breathing system
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 carried out 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: 0.5% FS ± 0.001 m
Water level resolution: 0.001 m
Ultrasonic sensors: 100 kHz / 0.150–1.500 m, 64 kHz / 0.250–3.000 m, 40 kHz / 0.350–10.000 m; operating frequency / dead zone – maximum range
Static pressure sensor: 100 kPa, 10 meters; customizable.
Host housing: 304 stainless steel
Battery: Built-in lithium‑ion battery, 76 Ah / 133 Ah at 3.6 VDC; self‑discharge rate not exceeding 5% per year.
Refresh: Factory default: measure once every 5 minutes and upload once; configurable.
NB‑IoT battery life: Under a 5‑minute measurement‑and‑transmission cycle, a 76 Ah battery lasts 4 years, while a 133 Ah battery lasts 7 years.
4G battery life: Under the 5-minute test-and-transmit operating condition, a 76 Ah battery lasts 4 years, while a 133 Ah battery lasts 7 years.

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.