Here is the working principle: Ambient air is filtered and purified before entering the air pump. The pump compresses the air to generate air pressure, which flows rapidly through a check valve into the air chamber. The air splits into two paths, one leading to the pressure sensor inside the pressure control unit and the other flowing through the air tube underwater. When the air pump stops running, the check valve closes, and the underwater tube outlet is sealed by air. This forms a sealed cavity connecting the pressure sensor and the underwater tube outlet. Since the pressure remains uniform throughout the sealed air chamber, the pressure at the tube bottom equals that detected by the sensor in the pressure control unit. Subtract the atmospheric pressure from the measured pressure to obtain the net water head pressure, and the water level can be calculated and calibrated accordingly.

The AN-BSR01 Bubble Water Level Gauge is a high-precision water level sensor independently developed and manufactured by Annaien. It adopts a micro piston pump as the air blowing and pressure guiding device. The device converts the hydrostatic pressure at the underwater measuring point into air pressure, which is transmitted above the water surface via the tube. The pressure sensor then detects and processes the pressure signal to complete water level measurement. As the pressure sensor only measures compressed air pressure without coming into contact with the measured liquid, the product delivers excellent long-term stability.

The AN-BSR01 bubble water level gauge features high precision, high reliability and intelligent functions. It requires no air cylinders or measuring wells and is maintenance-free. With good vibration resistance and long service life, it is ideal for scenarios where building measuring wells is impractical or costly, including flowing water bodies, rivers of all sizes and reservoirs. It is also applicable to heavily polluted and highly corrosive industrial wastewater. Typical application scenarios cover water conservancy and hydrology, upstream and downstream of dams, ocean water level monitoring, groundwater level monitoring, petroleum, chemical industry, sewage treatment plants and urban drainage pump stations.