Common pressure transmitter failures and solutions, the main faults are: 1 pressure goes up, the transmitter can not go up In this case, first check whether the pressure port is leaking or blocked. If it is not confirmed, check the wiring method. If the wiring is correct, check the power supply. If the power supply is normal, check whether the sensor zero has output, or simply pressurize. Whether the output changes, there is a change to prove that the sensor is not damaged, and if it is not changed, the sensor is damaged. Other reasons for this may be instrument damage, or problems with other parts of the system. 2 The output of the pressurized transmitter does not change, and the output of the pressurized transmitter suddenly changes, and the pressure relief transmitter will not return. The cause of this phenomenon is most likely caused by the pressure sensor seal, which has been encountered several times in our customers' use. Generally, it is because of the sealing ring specification (too soft or too thick). When the sensor is tightened, the sealing ring is compressed into the sensor pressure port to block the sensor. When the pressure is pressurized, the pressure medium cannot enter, but when the pressure is large, it suddenly opens. The sealing ring, the pressure sensor is changed by the pressure, and when the pressure is lowered again, the sealing ring is returned to block the pressure guiding port, and the residual pressure is not released, so the sensor zero position can not be lowered. The *** method to eliminate this cause is to remove the sensor and directly check whether the zero position is normal. If the seal is replaced normally, try again. 3 transmitter output signal is unstable The reasons for the signal instability are as follows A. The pressure source itself is an unstable pressure B. Instrument or pressure sensor is not strong in anti-interference ability C. Sensor wiring is not strong D. The sensor itself is very vibrating E. Sensor failure 4 transmitter is powered without output Possible reasons are: A. Connect the wrong line (check both meter and sensor) B. Open or short circuit of the wire itself C. The power supply has no output or the power supply does not match. D. Instrument damage or meter mismatch E. Sensor damage 5 Transmitter and pointer pressure gauge have large deviation *** First, the deviation is a normal phenomenon. Secondly, confirm the normal deviation range to confirm the normal error range: Calculate the error value of the pressure gauge. For example, the pressure gauge has a range of 30 bar, the accuracy is 1.5%, and the small scale is 0.2 bar. The normal error is: 30 bar * 1.5% + 0.2 * 0.5 (visual error) = 0.55 bar 6 Pressure transmitter error value For example: the pressure sensor has a range of 20 bar, the accuracy is 0.5%, the accuracy of the meter is 0.2%, and the normal error is: 20bar*0.5%+20bar*0.2%=0.18bar. The possibility of error in the overall comparison should be a device with a large error value. The error range is correct. In the above example, the sensor and transmitter deviation value can be regarded as normal within 0.55 bar. If the deviation is very large, use a high-precision meter (at least this meter is higher than the pressure gauge and sensor) for reference. 7 Influence of the installation position of the differential pressure transmitter on the zero output Due to the small measuring range of the differential pressure transmitter, the self-weight of the sensing element in the transmitter will affect the output of the differential pressure transmitter, so the zero position change occurred in the installation of the differential pressure transmitter. It is normal. The pressure sensitive component of the transmitter should be axially perpendicular to the direction of gravity during installation. If the installation conditions are limited, the transmitter zero position should be adjusted to the standard value after installation.
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