First, the selection of differential pressure transmitter principle Differential pressure transmitter is to measure the pressure difference of the medium in the process pipeline or tank, and convert the measured differential pressure value into current signal output through data conversion and pre-processing. To select the differential pressure transmitter, you need to know the following parameters: 1. Differential pressure value 2, medium 3, medium working pressure 4, medium working temperature 5, intelligent or analog 2. Differential pressure transmitter use precautions 1. Do not apply voltage higher than 36V to the transmitter, causing damage to the transmitter; 2. Do not touch the diaphragm with a hard object, resulting in damage to the isolation diaphragm; 3. The measured medium is not allowed to freeze, otherwise it will Damage to the sensor element isolation diaphragm, resulting in damage to the differential pressure transmitter, if necessary, temperature protection of the transmitter to prevent icing; 4, when measuring steam or other high temperature medium, its temperature should not exceed the transmitter The limit temperature in use must be higher than the limit temperature used by the differential pressure transmitter. 5. When measuring steam or other high temperature media, use a heat pipe to connect the transmitter and the pipe together and use the pipe. The pressure on the transformer is transmitted to the transformer. When the measured medium is water vapor, an appropriate amount of water should be injected into the heat pipe to prevent the superheated steam from directly contacting the transmitter and damaging the sensor. 3. During the pressure transmission process, the differential pressure transmitter should pay attention to the following points. 1. Connect the transmitter to the heat pipe. Do not leak air. 2. If the valve is closed before starting use, the valve should be opened very carefully and slowly to prevent the measured medium from directly impacting the sensor diaphragm. , thus damaging the sensor diaphragm; 3, the pipeline must remain unblocked, the deposits in the pipeline will pop up, and damage the sensor diaphragm; http://
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