How to calibrate the zero point of a differential pressure flow meter?
Thread Content
Should the three-valve block be turned off or on?
All three valves should be either open or all closed, and then the built-in exhaust device of the instrument should be turned on
Close the two pressure tapping valves of the three-valve assembly, open the balance valve, and zero it out.
Typically, differential pressure flowmeters are equipped with a low signal cut-off point; this point must be disabled first before performing the zeroing operation.
First, close the valve on the positive pressure side and open the balance valve; then close the valve on the negative pressure side to zero the setting； After completion, open the valve on the positive pressure side, close the balance valve, then open the valve on the negative pressure side for normal operation.