1. Differential Pressure Transmitter Operation Principle The differential pressure from the double sided pressure pipe acts directly on the diaphragms of the transmitter's sensors. It is conducted through the sealing liquid in the diaphragm to the measuring element. The measuring elements will be measured. The differential pressure signal is converted to its corresponding electrical signal and passed to the converter. After amplification and other processing, it becomes the standard electrical signal output. Differential pressure transmitter several application measurement methods:
(1) In conjunction with the throttling element, the liquid flow rate is measured using the differential pressure value generated before and after the throttling element.
(2) Measure the height of the liquid using the pressure difference generated by the liquid itself.
(3) Directly measure the pressure difference of liquids in different pipes and tanks.
The installation of differential pressure transmitters includes the laying of pressure guiding tubes, the laying of electrical signal cables, and the installation of differential pressure transmitters.
2. Differential Pressure Transmitter Fault Diagnosis During the measurement process of the transmitter, some faults often occur, and the timely judgment and analysis of the faults are crucial to the ongoing production. Based on our experience in routine maintenance, we summarized some judgment analysis methods and analysis procedures.
(1) Investigation method. Review the fire, smoke, odor, power supply changes, lightning, wetness, misoperation, and mishandling before the failure.
(2) Intuitive method. Observe the external damage of the circuit, the leakage of the pressure guiding pipe, the overheating of the circuit, and the status of the power switch.
(3) Test method.
Disconnection detection: Separate the suspected faulty part from other parts to see if the fault disappears. If it disappears, determine the fault. If not, proceed to the next step. For example: The smart differential pressure transmitter can not communicate with Hart remotely. Disconnect the power from the meter body and use the on-site power supply method to power the transmitter for communication to see if the cable is overlaid with an electromagnetic signal of about 2 kHz to interfere with the communication.
Short-circuit detection: In the case of ensuring safety, the relevant part of the circuit is directly shorted, such as: the output value of the differential transmitter is too small, the pressure tube can be disconnected, and the differential pressure signal is directly induced from the pressure-receiving valve at a time. To the two sides of the differential pressure transmitter, observe the output of the transmitter to determine the plugging and leakage connectivity of the pressure-conducting pipeline.
Replacement detection: Replace the suspected defective part and determine the fault location. For example, if you suspect that the transmitter circuit board has failed, replace it temporarily to determine the cause.
Branch detection: The measurement loop is divided into several parts, such as: power supply, signal output, signal transmission, signal detection, according to sub-section inspection, from simple to complex, from the table and in, narrow the scope, to find the fault location.
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