Transmitter Compression Principle

- Aug 07, 2017 -

The seal of the transmitter is compressed into the sensor pressure port inside the plug the sensor, the pressure medium can not enter the pressure, but the pressure suddenly opened the seal, the pressure sensor is subject to pressure changes, and the pressure is reduced again, Seal and back to block the pressure port, the residual pressure can not be released, so the sensor zero and not come down. The best way to troubleshoot this is to remove the sensor and see if the zero is normal.

The transmitter is conveyed through the packing and the filling fluid in the component to both sides of the measuring diaphragm. The diaphragm and the electrodes on both sides of the insulating sheet each form a capacitor. When the pressure on both sides of the inconsistency, resulting in displacement of the measurement diaphragm, the displacement and pressure difference is proportional to, so the capacity on both sides of the range, through the oscillation and demodulation links, converted into a signal proportional to the pressure. Pressure transmitters and absolute pressure transmitters operate in the same way as differential pressure transmitters, except that the low pressure chamber pressure is atmospheric or vacuum.

Transmitter to check the sensitive parts of the diaphragm with or without deformation, damage and oil leakage occurred. Remove the compensation plate, do not remove the sensitive parts, check the pin on the shell of the insulation resistance, the voltage does not exceed 100V in the case of insulation resistance should not be less than 100MΩ. When the pressure signal is the upper limit of the range, turn off the air supply, the output voltage and the reading value should be stable. If the output voltage drops, then the transmitter leaks, you can use soap and water to check out the leak site.

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