The effect of differential pressure transmitter and fault detection method1

Differential pressure transmitter is a commonly used transmitter products, mainly used for measuring the liquid, gas, and the liquid level, density and pressure of steam, with stable performance, high reliability and measuring precision, convenient maintenance, etc. Today, engineering is mainly to introduce the effect of differential pressure transmitter and fault detection method, hope you can help to you.

differential pressure transducer fault detection method

1 survey method:

review fault occurred in front of the lighter, smoke, odor, power supply change, lightning, damp, wrong operation, and maintenance.

2 intuitive method:

observation circuit of external injury, guide of pressure pipe leaking, overheating in the circuit and power supply switch state, etc.

3 tests:

1) Open circuit detection: separately from the rest parts of the suspected fault and to see whether the fault disappear, if lost, then determine the malfunction, or step into the next search, such as: smart differential pressure transmitter can't normal Hart, telecommunication, power supply can be disconnected from the table body, the method of field plus a power transmitter power to communicate, to see if the cable stack 2 KHZ electromagnetic signals interfere with communication.

2) Short circuit test: in the case of security, the related part of the loop short directly, such as: small differential pressure transmitter output values, guide pressure pipe can be disconnected, from a valve directly to the outside differential pressure signal directly led to the differential pressure transmitter, on both sides to observe the transmitter output, to determine the pipeline wall, leakage of connectivity.

3) Replace detection: will doubt defective parts replacement, judge fault position. Such as: suspected transmitter circuit board failure, can be temporary replacement, to determine the reason.

4) Segment detection: will measure circuit of divided into several parts, such as: power supply, signal output, signal transmitting, signal detection, according to the points of inspection, by Jane to numerous, situated, narrow range, find out the fault location.

the role of the differential pressure transmitter

differential pressure transducer is used to the pressure, flow, liquid level measurement is converted into standard parameters, such as signal, pressure transmitter and signal transmission unified instructions, recording instrument or regulator, in order to achieve the above parameters, according to the records and adjustments. In the recent 20 years, has a rapid development, has experienced the double pole type, vector type, micro displacement ( Capacitance, and inductance type silicon diffusion, etc. ) Intelligent, phase. The structure and force balance and the working principle of capacitive differential pressure transmitter are introduced. And the structure of pressure transmitter and pressure transmitter are basically the same.

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