For diaphragm pressure gauges, can they be used normally just by replacing the dial on top?
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For a diaphragm pressure gauge, if only the dial on the top is damaged while the diaphragm below is still in good condition, can it be used normally by simply replacing the dial? Just unscrew it from here at the thread and replace the dial? No need to evacuate, right?
Replacing a diaphragm pressure gauge is not simply a matter of replacing the dial; it requires judgment based on specific circumstances. If only the dial is damaged while the diaphragm and other parts are fine, then it is possible to try replacing only the dial. During actual operation, be sure to turn off the pressure source and release any remaining pressure to ensure safety. However, this process requires certain skills and experience; simply unscrewing it at the thread to replace it may cause the pressure gauge to fail to measure accurately or lead to other problems. In particular, the interior of the vast majority of pressure gauges is under vacuum conditions; without specialized equipment and experience, it is generally not recommended to attempt to open them on one’s own, as this could damage the pressure gauge or affect its accuracy. Therefore, it is recommended that you have the replacement done under the guidance of a professional, or seek help from a specialized agency. .
All the silicone oil inside will be released by you
It can be used only after replacement, oiling, and calibration are completed successfully
If the diaphragm is in good condition, it is incorrect to unscrew it from the location indicated in the diagram; to remove it, vacuuming and oiling must be done again, followed by re-calibration to ensure proper function. If the pressure gauge allows for the isolation of the pressure source, it can be unscrewed from the threads located beneath the diaphragm in the diagram in order to replace the gauge face.
Some manufacturers will indicate that disassembly is prohibited; if it is removed, the pressure-transmitting silicone oil inside will leak out, rendering it unusable. We haven’t done tasks like vacuuming and oiling ourselves; we hand them over to the manufacturer or buy a new watch.
A new set of diaphragm pressure gauges costs around 200, while those made of stainless steel cost about 500. This process of changing the table headers is not only time-consuming and labor-intensive, but it also does not guarantee a successful verification. Moreover, since those who are not involved in the production or calibration of pressure gauges do not have specialized tools and accessories on hand, it is more cost-effective to replace them with new ones.
It’s better to replace it entirely; otherwise it probably won’t work properly