Publish Time: 2022-06-03 Origin: Site
(1) When the indication value of the flow control instrument system reaches the minimum, first check the on-site detection instrument. If it is normal, the fault is in the display instrument. When the indication of the field detection instrument is also the smallest, check the opening of the regulating valve. If the opening of the regulating valve is zero, it is often a fault between the regulating valve and the regulator.
When the indication of the on-site detection instrument is minimum and the opening of the regulating valve is normal, the fault reason is likely to be caused by insufficient system pressure, blocked system pipeline, insufficient pump capacity, medium crystallization, improper operation and other reasons. If the instrument fails, the reasons are as follows: the orifice differential pressure flowmeter may be blocked by the positive pressure impulse conduit; Leakage in positive pressure chamber of differential pressure transmitter; Mechanical flowmeter refers to gear jamming or filter screen blockage, etc.
(2) When the indication value of the flow control instrument system reaches the maximum, the detection instrument will often indicate the maximum. At this time, the manual remote control regulating valve can be opened or closed. If the flow can be reduced, it is generally caused by process operation. If the flow value cannot drop, it is caused by the instrument system. Check whether the regulating valve of the flow control instrument system acts; Check whether the instrument measurement pressure system is normal; Check whether the instrument signal transmission system is normal.
(3) The indicated value of the flow control instrument system fluctuates frequently, so the control can be changed to manual. If the fluctuation decreases, it is due to the instrument or the inappropriate PID of the instrument control parameter. If the fluctuation is still frequent, it is due to the process operation.