To know the working principle of the bubble water level gauge and installation precautions Kunke will not have errors here

How much do you know about the working principle of bubble water level gauges? The editor has a few knowledge points here, hoping to effectively help you solve practical problems. Let us understand the working principle of the bubble water level gauge and the precautions for installation. How to avoid errors?

1. Working principle of bubble water level gauge

The pressure sensor of the bubble-type water level gauge is placed on the shore, and only one blowing pipe enters the water. The nozzle of the blowing pipe is fixed somewhere underwater, and the other end of the blowing pipe is connected to the shore-side instrument. The inside of the instrument is equipped with an air bag. Connect the air pump. Its working principle is that in a sealed gas container, the pressure at each point is equal. If the gas at the outlet of the blowpipe does not flow, then the gas pressure at the outlet is equal to the hydrostatic pressure at that point, and is also equal to the pressure inside the blowpipe. To make the gas pressure at the outlet of the blowpipe equal to the hydrostatic pressure at this point, the following two schemes can be used: One is to install an automatic pressure-regulating and constant-current device inside the instrument to automatically adapt to changes in hydrostatic pressure.

As long as the instrument releases gas slowly and uniformly, it can achieve the purpose that the gas pressure is equal to the hydrostatic pressure of the gas outlet. This scheme is called constant flow bubble water level gauge; When measuring the water level, the instrument starts to make the gas pressure exceed the hydrostatic pressure at the air outlet of the air blowing pipe, and then the air pump stops working. The air out of the air outlet slowly decreases until the air out stops, which means that the pressure at the air outlet is equal to the hydrostatic pressure. This scheme is called a non-constant flow bubble level gauge. By comparing the two schemes, in order to intuitively understand the current water level dynamics of the reservoir at any time, and combined with the actual situation of Tanghe Reservoir, the first constant-flow bubble water level gauge equipped with an automatic pressure-regulating and constant-current device was selected. After the pressure sensor measures the pressure in the pipe, the water level corresponding to the position of the gas outlet of the blowing pipe can be obtained by conversion.

2. Precautions for installation of bubble water level gauge

When installing the air blowing pipe, the installation position of the air bubble water level gauge is very important, which is related to the water level measurement accuracy, stability, and durability of the system. The gas pipe must be protected by galvanized stainless steel pipe, buried underground as much as possible, the gas line must be along the downward slope, the bending degree of the protection pipe should not be too sharp to ensure a smooth passage of gas, and the key parts of the gas pipe should be concrete Fix or fix the trachea on the existing stable building to prevent collapse in the event of floods and affect the normal operation of the water level gauge.

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