Micro differential pressure transmitter measures the pressure difference of the medium in the process pipeline or tank, and converts the measured differential pressure value into a current signal output through data conversion and square root transformation. Choosing a differential pressure transmitter requires knowledge of the differential pressure value, medium, working pressure of the medium, working temperature of the medium, and whether it is intelligent or analog.

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

1. Detection method:

1.1 Replacement detection: Replace the suspected faulty parts and determine the faulty location. For example, if there is suspicion of a malfunction in the transmitter circuit board, a temporary replacement can be made to determine the cause.

1.2 Division detection: Divide the measurement circuit into several parts, such as power supply, signal output, signal transmission, and signal detection. Check by division, from simple to complex, from surface to interior, narrow down the scope, and identify the fault location

1.3 Circuit detection: Separate the suspected faulty part from other parts and check if the fault disappears. If it disappears, determine the location of the fault. Otherwise, proceed to the next step of the search. For example, if the intelligent differential pressure transmitter cannot communicate with Hart remotely, disconnect the power supply from the body and use an additional power supply on site to power on the transmitter for communication, in order to check if the cable is overlapped with electromagnetic signals of about 2kHz and interferes with communication.

1.4 Short circuit detection: Under the premise of ensuring safety, directly short-circuit the relevant circuits. For example, if the output value of the differential pressure transmitter is too small, the pressure pipe can be disconnected, and the differential pressure signal can be directly led to both sides of the differential pressure transmitter from outside the primary pressure valve. Observe the transmitter output to determine the connectivity of blockage or leakage in the pressure pipe.

2. Investigation method:

Review the ignition, smoking, odor, power supply changes, lightning strikes, humidity, misoperation, and incorrect maintenance before the occurrence of the fault.

3. Intuitive method:

Observe external damage to the circuit, leakage of the pressure tube, overheating of the circuit, and the status of the power switch.

Micro differential pressure transmitter is a new type of transmitter produced by introducing foreign technology and equipment. Differential pressure transmitters are usually divided into three types: intelligent differential pressure transmitters, high static pressure differential pressure transmitters, and micro differential pressure transmitters