Solve a problem related to a differential pressure transmitter!
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1. Open the main valve, close the balance valve; the drain function is not reset to zero. 2. Close the main valve, open the drain valve, open the balance valve – the system resets to zero. What could be the reason for this? Is it related to the five-valve assembly? I’ve gotten rid of all the waste and stuff like that
In my opinion, the main valve should be closed completely, then the drain valve should be opened to empty it and closed again. After that, the balance valve should be opened to check – it should read zero. If it doesn’t read zero, then it needs to be adjusted
Can’t I do it that way? Please solve it
1. Close the positive and negative pressure tapping valves on the five-valve assembly, open the balance valve, and let the instrument readings return to zero； 2. Alternatively, close the positive and negative pressure tapping valves on the five-valve assembly, open the drain valve to connect it to the atmosphere, and the instrument readings will return to zero ； This premise holds when the pressure guide tube is in direct contact with the medium or when there is no migration.
Your 1 does not reset to zero. 2 reset to zero. Why is this?
Seeking help from kind people{:3_63:}
Strive to understand the function of each valve on your own
This can be understood as zero drift under normal pressure and under pressurized conditions; the pressure diaphragm exhibits deviations in pressure transmission
Young man, are you dreaming? By opening the main valve do you think you can balance the positive and negative pressure differences using a balance valve? There is a differential pressure when the main valve is open; the balance valve does not equalize the pressure as quickly. So generally, one has to close the root valve.
Is that so! I just turned off the main valve and turned on the balance valve, and the reading indeed returned to zero. If both the high and low pressures are 10 kilograms, could there be a pressure difference due to variations in the diaphragms for high and low pressure?