A pressure gauge is an instrument that measures fluid pressure. Usually the measured pressure is compared with some reference pressure (such as atmospheric pressure or other given pressure), so the relative pressure or pressure difference is measured.

Pressure gauge still plays an important role in formation testing due to its high precision, large measuring range, low maintenance cost and good vibration resistance. Especially in the process of measuring and shooting, pressure gauge is the first choice measuring instrument because of its good vibration resistance. At present, 2(X)-Jpressure gauges are in use in all oilfields in our country. Therefore, the best way to relieve the main faults of pressure gauges is instrument repair.

Various pressure gauges can be miniaturized, more accurate and fast to measure, especially can measure dynamic pressure, realize multi-point patrol detection, signal conversion, long-distance transmission, connection with computer, timely processing, etc., so it has been rapidly developed and widely used. .