The pressure sensor changes the pressure signal into a current signal, and the received pressure signal remains constant, while the actual pressure is constantly changing
The sensor is out of order
The current that reflects the magnitude of the pressure should be at 4~20mA. Is your current within this range? Beyond this range, be sure your sensor is out of order.If the current is fixed within this range, check that the pressure is applied to the sensor diaphragm Have you ever been blocked? If these are normal, you still think the sensor is broken.
Hello!The pressure sensor (transmitter) has measuring range, and should output linear 4 ~ 20mA signals to the measuring range.You can solve the problem through the following steps to determine the fault point.1, if you are reading data unchanged from the internal PC or PLC (thus suspected pressure sensor output current signal is constant), should check the procedure, or PLC will reset reset after the start, then go to observation.2 、 if you check the current value of the pressure sensor with a multimeter, it is found that the output has no change,A, the output is 0mA, first of all should determine the line problems, or wiring terminal, safety problems. Followed by instrument failure.If the B and the output are not changed by 4mA, you should first check whether the pressure source is really added to the pressure sensor and check that the hand valve is open. Second, check whether the pressure sensor is faulty or zero.C, the output if there is no change for 20mA, there may be two cases, one is smaller instrument range, the measured pressure range. Second, instrument failure (many instruments are to output 22mA as instrument fault alarm).D, the output is between 4 and 20mA within a certain value without change, first of all, the instrument power failure reset and restart, and if the fault is still the case, you should use the pressure check table to determine this instrument.In addition, in engineering practice, individual instrument anti condensation is relatively poor, used in low temperature measured medium, the internal will produce condensation water, resulting in abnormal output, and after the demolition of dry, and can be used. In this case, it should be replaced with an anti condensation meter, or with a condenser bend.
