Thread Content
The following are some of the more common faults in Bourdon tube pressure gauges along with methods for troubleshooting them. It is hoped that this information will be useful to those working in the field of measurement. Common faults, causes of these faults, and methods for fixing them: Pointer does not move – (1) There is a valve between the pressure gauge and the trap; the valve is closed. (2) The position of the three-way valve is incorrect. (3) The three-way valve or the trap is blocked. (4) There are cracks in the welds connecting the Bourdon tube to its support, causing leaks. (5) Defects in the pressure gauge itself: The pointer is loose relative to the central axis； Pointer stuck ； The sector gear has separated from the pinion. (1) Remove the valve and replace it with a tee valve. (2) Open the tee valve to the correct position. (3) Blow out the passage with steam; if that doesn’t work, remove it for cleaning. (4) Take off the pressure gauge for repair and replace it with a new one. The pointer does not return to zero. (1) The position of the tee valve is incorrect. (2) The trap or tee valve is blocked. (3) The spring element has lost its elasticity. (4) The balance wire of the pressure gauge has lost its elasticity or has come loose. (5) The pointer is bent or stuck. (6) The adjustment screw of the pressure gauge is loose. (1) Adjust it to the correct position. (2) Blow it out with steam; if that doesn’t work, replace it. (3)(4)(5)(6) Replace the pressure gauge. The pointer jumps around. (1) The balance wire is damaged or misaligned. (2) Both ends of the central shaft are bent. (3) The hinge connecting the Bourdon tube and the rod is not moving properly. (4) There is obstruction in the gear mechanism inside the pressure gauge. (5) High-frequency vibrations are affecting it. (6) The trap or tee valve is partially blocked. (1)(2)(3)(4) Replace the pressure gauge. (5) Eliminate the source of vibration. (6) Blow it out and check whether the gaskets are in the correct position. Internal leakage in the gauge. (1) Cracks in the Bourdon tube cause leakage. (2) Poor welding between the Bourdon tube and the support base leads to leakage. (3) The seal between the gauge case and the glass panel is compromised. (1)(2)(3) Replace the pressure gauge