Honeywell 51400926-100 PDG Control Board

Honeywell 51400926-100 PDG Control Board

Brand: Honeywell

Module: 51400926-100

Description: PDG Control Board

Product Orgin: USA

Honeywell 51400926-100 PDG Control Board. Negative deviation fault: When judging the measurement accuracy of the differential pressure transmitter in the positive migration state, two parts are generally carried out: First, the positive and negative pressure measurement of the three valve groups of the differential pressure transmitter should be closed, and then the balance valve should be opened and the instrument plug should be empty. At this time, 20mA should be the output value of the instrument; After the pressure point of the positive pressure chamber and the vent switch are closed and opened in turn, 4mA should be the output value of the instrument. After two operations, if the output value of the instrument is inconsistent with the actual value, then the problem may occur in the following aspects: (1) isolation fluid leakage; ② Positive and negative pressure chamber leads do not flow; ③ Zero is not found accurately; ④ The amount of migration changes.
Accurate control of liquid level is the prerequisite for stable operation of production equipment. Only by mastering the principle of liquid level migration of differential pressure transmitter can it be flexibly used in practical application, timely and accurately deal with the faults of field instruments, and improve the control scheme.

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