1. Overview

The HQP-80 bubble water level gauge is suitable for environments requiring continuous and precise water level measurement. As it does not require the construction of a water level well, it is one of the most ideal water level monitoring instruments for monitoring water levels at hydrological stations, reservoir water levels, dam piezometric tubes, and upstream and downstream water levels. It features convenient installation and maintenance, flexible operation, stable and reliable performance, and high accuracy.

The water level gauge uses a core unit as a high-precision pressure detection component. The pressure measurement accuracy is 0.05%, with advantages such as low power consumption, corrosion resistance, radiation resistance, interference resistance, and the ability to withstand long-term pressurization.

2, Working Principle

When collection is required, the air pump operates to generate compressed air, which enters the buffer air chamber inside the water level gauge, flows through a dedicated airflow pipeline, and enters the underwater air chamber. When the air pressure exceeds the water pressure, the air in the underwater chamber flows out, achieving a balance between air pressure and water pressure. The air pump then stops pumping, and after the pressure stabilizes, the air pressure at the core unit inside the water level gauge equals the water pressure. This is converted into liquid level height based on the specific liquid density.

3. Product Features

◆ Power supply, communication, and other ports feature lightning protection.

◆ No need to build a measuring well; the air tube connector uses a barbed fitting for convenience, reliability, and easy installation, use, and maintenance.

◆ Dual-stage one-way air valve automatically maintains constant air pressure.

◆ Two-stage air chamber (buffer): one inside the water level gauge and one at the end of the underwater air tube to buffer instantaneous air pressure.

◆ Automatic fault detection for core unit failure, air tube blockage, air leakage, overpressure timeout, high water level, low water level, low power supply voltage, etc., with automatic detection and upload.

◆ High-precision core unit selected for the sensor.

◆ Ultra-low power consumption: static current less than 3.2mA.

◆ Wide voltage range: 10VDC~14VDC. Customizable 8-30V input available.

◆ Wide measuring range: 0~20m, 0~40m optional, or other specifications.

◆ Multiple communication methods: standard digital output: 485 (MODBUS_RTU protocol); analog output (optional): 4~20mA.

◆ Multiple working modes: Mode 0 for timed collection, enabling ultra-low power consumption by setting the air pump operation interval and duration to ensure data real-time while minimizing power consumption; Mode 2 for button or host command collection, facilitating on-site debugging.

◆ Embedded clock module.

◆ 2.5M bytes of solid-state storage can store 20,480 sets of time-stamped data. If storing twice a day, it can last for 28 years. Cyclic storage.

◆ Software and button settings for working mode, liquid density, collection timing, trigger interval, air pump time limit, stabilization time, monitoring time limit, monitoring amplitude, 485 communication address, etc. All parameters can be set via software or buttons. Button operation is disabled during data collection.

◆ Chinese LCD display: automatically lights up during collection; press any key to turn the display on or off. The display automatically turns off after 5 seconds of inactivity when lit. Button setting process exits after 1 second of inactivity, and the screen turns off.