There are three commonly used pressure measuring methods for pressure check side meters.
Liquid column manometry
According to the principle of hydrostatics, the measured pressure is converted into the liquid column height for measurement. For example, U-tube pressure gauge, single-tube pressure gauge, inclined tube pressure gauge, etc. The pressure gauge has a simple structure and is convenient to use. However, its accuracy is affected by factors such as capillary action, density and parallax of the working fluid, and the measurement range is narrow. Only local indications can be made, generally used to measure the minimum pressure or vacuum.
2. Electrical side pressure method
The measured pressure signal is converted into an electrical signal (voltage, current, frequency, etc.) by mechanical or electrical components for location and transmission, such as capacitive, resistive, inductive, strain gauge and Hall-plate pressure sensors. Pressure Transmitters. This type of instrument has a simple structure, wide measuring range, small static pressure error, high precision, convenient adjustment and use. It is often used to measure rapid changes, pulsating pressure and the need to transmit pressure signals over long distances.
3. Elastic manometry
According to the principle of the elastic deformation of the elastic element, the displacement of the measured pressure is converted into the displacement of the elastic element for measurement. Such as spring tube pressure gauge, bellows pressure gauge and diaphragm pressure gauge. This type of pressure gauge has a simple structure, low price, reliable operation, convenient use, and is often used in applications where the accuracy is not high and the signal does not need to be transmitted far. As the local inspection side and monitoring device for pressure.
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