Common faults and adjustment methods of stainless steel seismic resistance meter

1. The pointer does not return to zero.

(1) If the pointer is bent or loose, it can be corrected with tweezers, and it can be tightened after verification.

(2) If the hairspring torque is insufficient, you can disengage the meshing between the central gear and the sector gear, and turn the central gear shaft counterclockwise to increase the hairspring reaction torque.

2. The pressure gauge pointer is jumping or sluggish and does not rotate.

(1) There is friction between the pointer and the surface glass or dial. At this time, you can correct the pointer, thicken the washer under the glass or wring the shaft hole of the pointer bigger.

(2) The central gear shaft is bent, and the shaft diameters are not concentric and do not match. The gear can be removed and straightened with a wooden hammer or straightened with flat pliers.

(3) There is dirt at the meshing position of the two gears, and the two gears can be removed for cleaning.

Stainless steel earthquake-resistant table

3. A verification point is out of tolerance. According to the requirements of verification regulations, the indicated value verification of pressure gauge should be carried out according to the graduation line marked with numbers. So stop at the scale where the out-of-tolerance is found. Check the coordination of all parts on the scale point and whether the transmission shaft hole is blocked; Whether the connecting rod is flexible; Whether there is any damage or foreign body at the meshing point of the teeth is excluded. If there is an error at a certain point, it is often due to dirt and burr at the meshing point of the teeth; When there is a negative error, it is mostly due to the shape damage or injury of the teeth, which should be repaired or replaced.

4. The indication is unstable and the pressure drops obviously. At this time, first check whether the joint between the pressure gauge and the pressure gauge calibrator leaks oil. If there is no oil leakage and the calibrator is in good condition, it means that there is leakage inside the spring tube, and the scale plate should be removed for further inspection.

(1) The frame itself has sand holes, which gradually leak after long-term use. The frame of the same specification needs to be replaced, and the welding can be repaired by measuring the low pressure.

(2) Under the action of pulse pressure for a long time, the spring tube is fatigued or the sealing parts at both ends are leaking. The sealing parts at both ends can be repaired or re-tightened, and the pressure gauge will be scrapped directly if it breaks.

5. The error of pressure indication value is uneven.

(1) The deformation of the spring tube fails, and the displacement is not directly proportional to the pressure, so the spring tube needs to be replaced.

(2) The transmission ratio between the free end of the spring tube and the sector gear and wheel rod is not properly adjusted, so it needs to be re-inspected.

(3) The combination position of the gear splint and the bottom plate is wrong. The combination screw should be loosened to drive the splint counterclockwise.

6. The pressure gauge pointer does not rotate. When the applied pressure reaches the upper limit calibration value of the pressure gauge, the pointer of the pressure gauge still does not move or rarely moves, indicating that the pressure has not been transmitted to the spring tube. At this time, check whether the sealing gasket connected with the pressure gauge calibrator blocks the channel at the joint. If there is no problem at the joint, it proves that the pressure gauge is blocked internally, and it should be disassembled and cleaned before verification.

Difference between diaphragm pressure gauge and diaphragm pressure gauge

First, the working principle

Diaphragm pressure gauge: When the diaphragm pressure gauge is used for pressure measurement, the measuring medium will directly act on the isolation diaphragm, and generate upward pressure perpendicular to the diaphragm, so that the diaphragm will deform, and the deformation will occupy the space and urge the filling liquid in the spring tube to transfer the medium pressure to the spring tube, so that the end of the spring tube will be elastically deformed, and the gear shaft of the movement will be driven to rotate by the linkage mechanism, so that the pointer can indicate the measured pressure value on the dial.

Diaphragm pressure gauge: Under the action of pressure, the working medium to be measured directly acts on the elastic diaphragm, and the diaphragm elastically deforms upward (measuring positive pressure) or downward (measuring negative pressure), and the gear shaft of the movement is driven to rotate by the connecting rod mechanism fixed in the center of the diaphragm, so that the pointer indicates the measured pressure value on the dial.

Second, the elastic element

Diaphragm pressure gauge: the elastic element is a spring tube, and the diaphragm only plays an isolation role.

Diaphragm pressure gauge: The elastic element of diaphragm pressure gauge is corrugated diaphragm. The measured pressure acts on the diaphragm, which generates upward (or downward) elastic deformation, and the pressure value is indicated by the connecting rod mechanism welded on the diaphragm.

Third, the accuracy level

Diaphragm pressure gauge: the general accuracy level is 1.6.

Diaphragm pressure gauge: the accuracy grade is 2.5.

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