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Fault Analysis of Differential Pressure Transmitter

If the micro differential pressure transmitter encounters problems during use, we can use the following three methods to solve them:

1. Detection method:

(1) Replacement detection: replace the parts suspected to be faulty and judge the fault position. For example, if it is suspected that the circuit board of micro differential pressure transmitter is faulty, one can be replaced temporarily to determine the cause.

(2) Divisional detection: divide the measuring circuit into several parts, such as power supply, signal output, signal transmission and signal detection. Check by parts, from simple to complex, from outside to inside, narrow the range and find out the fault location.

(3) Open circuit detection: separate the suspected fault part from other parts to check whether the fault disappears. If it disappears, determine the fault, otherwise you can find it in the next step. For example, if the intelligent micro differential pressure transmitter cannot communicate with Hart remotely, you can disconnect the power supply from the body and energize the transmitter with additional power supply on site for communication, to check whether the cable is superimposed with an electromagnetic signal of about 2kHz to interfere with communication.

(4) Short circuit detection: under the condition of ensuring safety, directly short circuit relevant circuits. For example, if the output value of the micro differential pressure transmitter is too small, disconnect the impulse pipe, directly lead the differential pressure signal from outside the primary pressure tapping valve to both sides of the micro differential pressure transmitter, and observe the transmitter output to judge the connectivity of blockage and leakage of the impulse pipeline.

2. Investigation method:

Review the ignition, smoke, peculiar smell, power supply change, lightning stroke, humidity, mis-operation and maintenance before the failure.

3. Visual method:

Observe the external damage of the circuit, leakage of the impulse pipe, overheating of the circuit, power supply switch status and so on.

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