Product Introduction

The KH.WQX Pneumatic Bubble Water Level Sensor is a high-precision water level monitoring instrument independently developed by KEHAO. It measures water level by using a miniature piston pump to inject air into the measuring tube and bubble chamber. The static water pressure at the submerged point is converted into gas pressure, which is transmitted through the tube to above the water surface. A pressure sensor detects and processes the pressure signal to calculate the actual water level with excellent accuracy and stability.

The sensor uses imported three-way solenoid valves to eliminate zero drift, with an intelligent control unit periodically switching the valve for automatic zero point calibration. Level 1 accuracy is verified within the 0–10 m range, meeting national standard requirements.

Key Features

• Long-Term Stability: Measures compressed air pressure without direct contact with water, ensuring highly stable readings.

• Easy Installation: No need for constructing measurement wells; unaffected by floating debris.

• Automatic Zero Calibration: Midnight automatic zero correction eliminates zero drift errors completely.

• Lightning Protection: Submerged components contain no electronic parts or cables, ensuring safety during storms.

• Temperature Compensation: Optional external temperature sensor compensates for liquid density changes caused by temperature.

• Flexible Output: Provides analog output and digital communication interfaces (RS485/SDI-12).

• Wide Voltage Protection: Supports reverse polarity, overvoltage, overcurrent, and lightning surge absorption.

• User-Friendly Display: LCD screen and input keypad for intuitive real-time water level display and operation.

• Automatic Tube Cleaning: Ensures the air tube remains unobstructed.

• Data Storage: Cyclic storage of up to 10,000 measurements.

• Modbus Communication: Compatible with various data acquisition systems.

• Replaceable Air Tube: Simplifies maintenance and prolongs device life.

Application Scenarios

• Continuous monitoring of rivers, reservoirs, streams, and channels

• Hydrological and oceanographic stations

• Pumping stations and hydropower plants

• Environmental monitoring in flood-prone areas and water resource management

Technical Specifications