After the pressure gauge is used, what causes the pressure gauge pointer to go to the zero?

After the pressure gauge is used, what causes the pressure gauge pointer to go to zero?

In this case, the pressure gauge is qualified. After installation, the pressure gauge pointer is close to the disc stop nail, but the pressure gauge is used for a period of time. When the pressure gauge is removed or the pressure gauge is sent to the inspection timing, the pointer will leave zero.

There are many reasons for this:

1. Due to the large elasticity of the spring tube in the pressure gauge, which causes the pointer to go to zero after using the pressure gauge for a period of time. When this happens, pressure gauges with a large range of 10MPA or more generally occupy a large proportion.

2. Due to improper operation of the user of the pressure gauge, the pressure is suddenly increased to more than twice the range of the pressure gauge, which causes the pressure gauge spring tube to deform (not be elastically deformed) or the tooth of the pressure gauge movement to be dislodged, making the pressure gauge pointer Off to zero, this situation is generally called "hit the pressure gauge", that is, the pressure gauge is damaged due to excessive pressure in the user's use, causing the pressure gauge pointer to go to zero.

3. If the pressure gauge is working, if there is a certain vibration in the field environment, due to the individual screws of the pressure gauge not being tightened, misalignment of the pressure gauge dial, loosening of the lever, movement of the movement, etc. may cause the pointer of the pressure gauge to go to zero. That is, after the pressure gauge is adjusted by the worker, the rod screws are not tightened. The pressure gauge is repeatedly pressed during the pressure test, and the rod is loosened, causing the pressure gauge pointer to go to zero.