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Regarding the calibration steps for the pressure switch, could you please check if my modifications are correct?

2018-12-10View Original

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In my opinion, the description of the calibration steps for the pressure switch in the picture is extremely difficult to understand. I have revised it as follows; please help check if there are any further improvements that can be made 1 Verification of low-pressure switch alarm (following the fail-safe principle; taking the case of an alarm triggered by contact disconnection as an example, with the wiring connected to the normally open contacts). Slowly increase the pressure using a hand pump until it exceeds the set value, thereby causing the normally open contacts of the pressure switch to close; then slowly reduce the pressure back to the set value, at which point the contacts will disconnect. Record the pressure value at which the contacts disconnect (the operating value) ; Then continue to reduce the pressure to 95% of the alarm pressure, hold it for 1 minute, and then slowly increase the pressure. When the contacts of the pressure switch close again, record the pressure value at that moment (the recovery value) and make a note of it. 2 Verification of high-pressure switch alarm (following the fail-safe principle; taking the case of an alarm triggered by contact disconnection as an example, with the wiring connected to the normally closed contact). Using a hand pump, increase the pressure gradually to the set value until the normally closed contact of the pressure switch disconnects; record the pressure value at the moment the contact disconnects (the operating value) ; Then, continue to increase the pressure to 105% of the alarm pressure and hold it for 1 minute; after that, slowly start reducing the pressure. When the contacts of the pressure switch close again, record the pressure value at that moment (the recovery value) and make a note of it.
Reply #22018-12-10
It should first be checked whether the pressure switch operates properly when there is no pressure
Reply #32018-12-11
Strive for accuracy in wording and choice of words, aiming to make it easy for readers to understand. Welcome to all experts for your comments and suggestions.

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