ShenZhen StarWSN Science & Technology Co.,Ltd

1.Introduction

•  The bubble water level gauge adopts a micro piston pump as the air-blowing pressure guiding device, which draws water through the measuring tube above the water surface. The pressure sensor then detects and processes the signal to achieve water level measurement. Since the pressure sensor measures the compressed air pressure without direct contact with the liquid, it ensures extremely high stability.

•  This device features high precision, advanced intelligence, no need for gas cylinders or measuring wells, maintenance-free operation, vibration resistance, and a long service life. It is particularly suitable for monitoring flowing water bodies, rivers, reservoirs, sewage, and corrosive industrial wastewater.

2.Measurement principle
•  External air is purified through an air filter before entering the air pump. The pump compresses the air to generate pressure, which is then rapidly directed through a one-way valve into the air chamber. The gas splits into two paths—one leading to the pressure sensor in the pressure control unit, and the other flowing into the submerged bubble tube.

•  When the air pump stops operating, the one-way valve closes, sealing the submerged tube opening with trapped gas. This creates an enclosed cavity connecting the pressure sensor and the submerged tube outlet. Since pressure remains uniform within a sealed gas chamber, the pressure at the bottom of the tube equals that measured by the pressure sensor. By subtracting atmospheric pressure from this value, the net hydrostatic pressure (water head) is obtained. Through calculation and calibration, accurate water level data is derived.

1. Non-contact measurement with high accuracy, excellent stability, and easy maintenance.
2. Simple installation—no measurement well required, unaffected by floating debris on water surfaces.
3. Features automatic zero calibration to completely eliminate zero drift issues.
4. External temperature sensor enables effective compensation for liquid density variations caused by temperature changes.
5. Equipped with analog output and digital communication interfaces for user convenience.
6. Wide-voltage design with reverse-connection protection, overvoltage protection, and overcurrent protection.
7. Includes an automatic cleaning function to ensure smooth airflow in the guide tube.
8. Supports storage of up to 200,000 historical data records.

No	Name	Parameter
1	Measurement principle	Static pressure
2	Measurement range	0-50m
3	Measurement precision	±0.03%FS
4	Communication method	4G/NB-IOT
5	Communication protocol	MODBUS-RTU/AN-UNION
6	Power	Solar energy
7	Voltage	12～24VDC
8	Storage temperature	-20～80°
9	Working temperature	-20～70°
10	Measurement interval	Default 1 minute, configurable of 1-60 minutes
11	Display screen	4.3 inch IPS LCD touch screen
12	Display screen resolution	800*800
13	Data storage	Built-in 16M storage chip, capable of storing 200,000 historical data records.
14	Data interface	USB2.0*1
15	Data output	USB
16	Data clearing	One-click clearing
17	Device status collection	Real-time monitoring of device voltage, current, internal temperature, and humidity values.
18	Real-time data viewing	Display of water level,temperature,humidity,voltage,system time,and working status

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