Since the failure of the differential pressure sensor is mostly zero drift and conduit clogging, the differential pressure sensor scale is seldom calibrated point by point in the field, but the zero point of the differential pressure sensor and the trend of change is checked. 1、Check of conduit liquid blockage or solidification This situation can be observed for a longer period of time to determine the changes in the output value of the instrument. Differential pressure sensor in normal operation, the pipeline fluid through the throttle, its downstream will produce a large number of high-frequency amplitude vortex. Expressed in the negative pressure value of high-frequency, with different amplitude pressure fluctuations, reflected in the output of the pressure sensor is also at a certain point up and down fluctuations. If the differential pressure sensor output display value does not change for a long time (the recorder draws a straight line), it can be basically determined that the liquid in the pressure conduit is blocked or solidified. To further determine, you can quickly open the balance valve and immediately close, if the differential pressure sensor output value declines and restores, that is, you can be sure that the differential pressure sensor is not a circuit problem, and further judgment is the pressure conduit liquid blockage or condensation of the problem. 2、Zero drift check Close the positive pressure valve, open the balance valve, close the negative pressure valve, at this time the output current value of 4mA, otherwise adjust the zero screw, so that the output current value of 4mA. adjust the zero point, restart the instrument. Star Instruments Sensor Manufacturing Co., Ltd. is a collection of research and development, production, sales as one of the high-tech enterprises. Specializing in the production of pressure transmitters, level transmitters, temperature transmitters, temperature and humidity transmitters, differential pressure transmitters, soil moisture transmitters, 3051 transmitters and related instrumentation accessories. Many products under the brand of Star Instruments have obtained a number of patents issued by the state, such as CE certification, IS9001 certification, SGS certification, TüV SüD certification, explosion-proof certification and so on. For product consultation, product customization, agency, technical inquiries, quotes, etc., please contact Star Meter: 400-600-4496 !