Working principle and precautions of bubble water level gauge

When encountering continuous strong storm weather , lakes 、 The water level of the reservoir rises rapidly , Whether to discharge flood 、 It is difficult to decide when to discharge the flood . And the city is full of tall buildings 、 Heavy traffic on the street , Violent storms will cause serious urban waterlogging , Threaten the safety of human life . In the face of floods and other critical situations , Water level gauge comes in handy . Water level gauge is mainly used for ocean 、 Measurement of water levels in rivers and lakes . For ten years , The device has carried out the verification of various forms of water level gauges 、 Calibration work , It meets the needs of this kind of instrument .

The working principle of bubble type water level gauge is that the external air is filtered through the air filter 、 After purification , Enter the air pump . Compressed by air pump , Generate air pressure , Flow quickly to the air chamber through the check valve , The gas diffuses into the pressure sensor in the pressure control unit and the vent pipe under the water in two ways . When the air pump stops working , The check valve is closed , The mouth of the underwater vent pipe is sealed by gas , Thus, a closed cavity connecting the pressure sensor and the underwater vent nozzle is formed . Because the pressure is equal everywhere in the closed gas container , The pressure at the bottom of the gas tube is equal to the pressure at the sensor of the pressure control unit , Subtract atmospheric pressure from this pressure , You can get the net pressure of the head , The measured water level can be obtained through conversion and correction .
Bubble type water level gauge has many advantages . First of all, the instrument is easy to install 、 High precision 、 High reliability and non-contact measurement 、 High compatibility 、 A variety of communication interfaces . Suitable for China's water quality and water regime , Especially the water level monitoring of medium and small rivers , The water level of the surge shaft of the power plant 、 Measurement of water level upstream and downstream of the dam ; ocean 、 Measurement of groundwater level ; chemical 、 coal mine 、 Sewage treatment 、 Water level and liquid level monitoring of waterworks, etc ; It is suitable for areas where logging is inconvenient or expensive .

Secondly, the instrument can every 6 Automatically start the cleaning function once every hour , Effectively prevent pipeline blockage . At the same time 6 It can automatically replenish high-pressure gas once every hour , It is mainly used to remove blocking and replace hot air in the air circuit .
More Than This , The instrument has three communication functions , The three interfaces can work at the same time . And it has powerful storage function , It can be stored no less than 50 Ten thousand records , The time is no less than 3 year . stay 5 min/ At the sampling interval of times , Can save offline at least 3 Years of data , The exported data can be used as the raw material for historical compilation .

In terms of practical operation , We should pay attention to the following points .
First of all , Installation of water level gauge requires φ50 mm Galvanized steel pipe or national standard PVC Management and protection , The corners of the protective tube should not be too sharp , Turning should be greater than 90°, Bury and fix the protective pipe with soil or fix it on the existing stable building .

second , When installing the air volume, the opening direction should be vertically downward , The air volume cannot vibrate with the current and waves , It must be completely fixed . Install the front and rear ferrules at the air pipe joint , Tighten with a wrench , Do not use your bare hands , Prevent air leakage . in addition , The gas outlet of the gas pipe is generally installed below the historical water level 0.5 m It's about .

Third , The bubble water level gauge is prohibited from RTU Direct power supply , Because the air pump will produce a short-term high current when it works , The separate power supply mode is to better protect the normal operation of their respective instruments .