Common pressure gauge failure causes analysis and elimination methods


1. The pointer returns to zero and fails, and the zero error is large

The pressure gauge often does not return to zero in the process of use, that is, in the absence of external negative pressure, the pressure gauge pointer will point to a pressure value reading. If the deviation value measurement is allowed, it will cause a greater impact on the measurement results. Interfere, affect production or life, and even lead to potential safety hazards. The reasons for the non-zero failure of the pressure gauge and the methods for troubleshooting are as follows:

(1) The load pressure of the pressure gauge is too large, causing the deformation of the spring tube to exceed the allowable value of the elastic coefficient, resulting in non-rebound deformation. The solution to this kind of fault is: remove the pointer, re-install it with the pointer pointing to the zero position, and conduct a test. If the performance still fails to meet the requirements of use after calibration, the spring tube needs to be replaced;

(2) The pressure gauge shakes. Generally, it is due to the loosening of the fixing screws of the pressure gauge. Use professional tools to fasten the mounting screws;

(3) The inner gear of the pressure gauge is dislodged. It is generally caused by too few meshing teeth between the pressure gauge sector gear and the gear shaft. It is necessary to disassemble the pressure gauge to replace the gear, and adjust the meshing number of teeth between the gear and the gear shaft;

(4) The pointer indicating end is deformed. The fault is mainly caused by the excessive change of the load pressure of the pressure gauge, and the pressure gauge needs to be disassembled to replace the pointer;

(5) After working for a period of time, the internal cavity is blocked, and the channel needs to be cleaned.

2. The indicating end of the pointer is behind the zero stop pin

After the pressure gauge has been working for a period of time, it will occasionally happen that the pointer indicating end is located behind the zero stop pin in the dial. The fault is mainly due to the excessive distance between the pointer of the pressure gauge and the dial or the insufficient strength of the pointer. When the pressure gauge vibrates violently, the pointer jumps over the stop pin, and cannot reset by itself after jumping to the stop pin. The solution is: gently disassemble the protective cover of the pressure gauge, lift the pointer to the zero stop pin, and adjust the distance between the pointer and the dial to avoid the recurrence of the same failure.

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