Failure judgment and online verification of spring tube pressure gauge
1. There is no indication or no change in pressure.
Pressure gauges often have sampling valve or pressure guiding tube blockage failure. When the blockage is serious, the pressure gauge will have no indication, which is a very dangerous failure. Overpressure accidents may occur if the process is careless. The sampling valve or pressure guiding tube is slightly blocked, and the pressure The pointer of the meter will appear slow or insensitive, the process pressure will change but the pressure indication will not change, and the sampling valve and pressure guiding tube can be flushed.
If the pointer of the pressure gauge and the central axis are loose or the pointer is stuck, there will be no indication of the pressure gauge or the indication does not change. You can tap the pressure gauge shell and observe the change of the pointer to judge the fault.
2, the pointer of the pressure gauge does not go down.
It is common that the pressure of the measured medium pressure pressure gauge increases instantaneously, and the pointer of the pressure gauge cannot be lowered when the pointer of the pressure gauge is flushed under the stop pin. The reasons for not returning to the lower are: loose pointer, problem with hairspring, insufficient torque of hairspring, deformation of hairspring, The sector gear is worn and the gauge joint is blocked by dirt. After the pressure can be removed, observe whether the pointer of the pressure gauge can return to the lower level, and still do not return to the lower level. Remove for repair and calibration.
The measured medium is liquid or condensate. The installation position of the pressure gauge is lower than the pressure measuring point. The static pressure of the liquid or condensate in the pressure guiding tube will prevent the pressure gauge pointer from returning to low. This is a normal phenomenon. Back to low, there is a barrier fluid that can not be drained.
3, the pressure gauge pointer is beating or stagnating.
The possible reasons are: the needle of the diaphragm pressure gauge is loose, the pointer is rubbed against the glass or the dial, the sector gear rubs against the central shaft, or there is dirt, the pressure gauge pointer is loose, vibrates off, the sector gear and the shaft in the watch Gear disengagement is mostly caused by installation on equipment with high vibration. Vibration reduction measures cannot be taken, and it can be replaced with a vibration-resistant pressure gauge.
