The pressure gauge is widely used in instrumentation industry, almost every field can be applied to different products, with the expansion of the market, we produced is also a wide range of products, types of products our customers need we all will be one of the research, thereby increasing the types of products and customers demand, with the increase of product categories, using the instrument will always appear some small fault, today we analysis is pressure gauge common fault and its main causes.
One, the pressure gauge is not allowed
1, the impact of the temperature is not installed with a water pipe, high temperature steam or high temperature liquid directly into the spring tube, in addition to the pressure, the temperature is due to elongation, resulting in spring action to increase, the error becomes large.
2, the effect of vibration is to be measured by gas, liquid or vibration of the test body, one is the internal mechanism of the vibration of the pressure gauge. Vibration of the pressure gauge gear deformation wear, gossamer disorder, loose pointer, bearing damage and so on, so that the pressure meter accuracy is lost, damaged, or even.
3, the impact of overload pressure gauge is often in the range of the dial 2 / 3 above the position, after long-term use, resulting in the spring tube elasticity is insufficient or produce permanent deformation, so that the impact of accuracy.
4, other effects of the pressure gauge into the dirt and impurities; not for adjustment and calibration; poor management or touch.
Two, pointer does not refer to zero
1, the spring pipe to lose flexibility (Shen Zhi).
2, the gossamer lose elasticity and fall off.
3, three pass through the channel, the pressure meter connected to the pipe or water pipe blockage.
4, pointer bending or stuck.
Three, pressure table pointer jitter
With the bolt 1, hairspring damage, connecting rod and gear sector inactive.
2, both ends of the central shaft bending, rotation of the shaft at both ends of the rotation of the rotation.
3, the pressure gauge three through the plug or the water pipe elbow channel is partially blocked or covered by the lining.
Four, the pressure gauge pointer does not move
Three, 1 way cock is not open or position is not correct.
2, three through the plug, pressure gauge or water storage pipe blockage.
3, the pointer and the central axis of the binding site may be loose or pointer stuck.
4, the spring tube and the table seat leakage.
5, the sector gear shaft may be loose, and not to the small gear drive off.
Five, the pressure surface appear blurred or drops
1, the pressure gauge spring elbow has leakage place.
2, spring elbow and bearing poor welding, there is leakage phenomenon.
3, the case with the glass plate with no rubber gasket or rubber pad aging, the case and the glass plate seal is not good.
