1. The pressure gauge
has no indication.
Reason: 1. The shut-off valve on the pressure guiding pipe is not opened;
2. The pressure guiding pipe is blocked;
3. Too much dirt accumulates in the spring pipe joint and is blocked;
4. The spring tube is cracked; 5. The center tooth and the fan tooth are worn too much, so that they cannot mesh.
Second, the pointer jitters greatly.
Reasons: 1. The pressure of the measured medium is large;
2. The installation position of the pressure gauge
3. The pointer of the pressure gauge
is beating or sluggish.
Reasons: 1. There is friction between the pointer and the surface glass or scale;
2. The central gear shaft is bent;
3. There is dirt in the meshing of the two gears;
4. The movable screw between the connecting rod and the fan gear is not flexible.
4. After the pressure is removed, the pointer cannot return to the low point.
Reasons: 1. The pointer is bent; 2. The hairspring is short and insufficient; 3. The pointer is loose; 4. The transmission gear has friction.
5. The pressure indication error is uneven.
Reasons: 1. The spring tube is deformed and fails;
2. The free end of the spring tube and the sector gear, the connecting rod transmission ratio is not adjusted properly.
6. The transmission ratio is out of balance.
7. The indication is low.
Reasons: 1. The transmission ratio is out of balance; 2. The spring tube has leakage; 3. The pointer or the transmission mechanism has friction; 4. The pressure guiding pipeline has leakage.
8. The pointer cannot indicate to the upper limit scale.
Reasons: 1. The transmission ratio is small; 2. The movement is fixed in the wrong position on the base; 3. The welding position of the spring tube is improper.