The issue of measuring pressure in pipelines
Thread Content
In the air conditioning room, the height of the water inlet pipe is 4 meters. The pressure in the pipe is measured using a differential pressure transmitter, which is installed at a height of 1.2 meters. The pipe and the differential pressure transmitter are connected through pressure transfer pipes. Is the pressure displayed by the transmitter the actual pressure in the pipe? There is still the issue of zero-point drift.
Is what is being measured the differential pressure or the pressure itself? ? Why are differential pressure transmitters used for measuring pressure? ?
To measure the pressure in a pipeline, the low-pressure side of the differential pressure transmitter is connected to the atmosphere, and the transmitter is used as a pressure transmitter.
The pressure tapping pipes have vertical height differences and need to be repositioned; furthermore, for pipes that are 4 meters high, the pressure at different heights also varies due to the effect of gravity
How is this zero-point migration calculated?
The vertical height from the pressure tapping point where measurement is taken to the pressure tap tube of the transmitter; P = density * g * h – this is the amount of migration. In the negative-pressure type, it affects the atmosphere; in the positive-pressure chamber, this effect has to be subtracted in order to obtain the pressure at the measurement point – this amount represents the difference due to gravity.
Why not simply install a mechanical pressure gauge for pipeline pressure? Using a pressure transducer turns what is a simple issue into something complicated~~~ Besides, you said it’s for an air conditioning room where control is based on temperature levels; pressure levels aren’t necessary. So why install a pressure difference sensor for use in conjunction with the water pump room? ? ?
1: If you use a differential pressure transmitter to measure pressure, it is sufficient to leave the high-pressure side open and connect the low-pressure side to the pressure gauge tube. 2: If you are measuring liquid level, an incorrect installation height is used; the transmitter needs to be repositioned using the correct installation height
The low-pressure side should be connected to the atmosphere, while the high-pressure side should be connected to the pressure guide tube.
In the eighth grade, there’s a formula: P=ρgh. All liquids have pressure, so this pressure can be converted into h. You’re not in the instrumentation field!
10 meters of water column is approximately equal to 0.1 MPa; just remember that~