The first is a pressure, the transmitter also couldn't get on. The situation, should first check whether the pressure interface is a flat or clogged, if confirmation is not, check the connection mode and check the power supply, such as power supply is normal for a simple pressure to see if the output changes, or review the sensor zero output, if no change the sensor has been damaged, can be the instrument damage or other aspects of the system as a whole。
The second is pressure transmitter output does not change, then sudden changes in pressure transmitter output pressure transducer zero return not to go, is likely to be pressure sensor seal problem. Common is due to seal specifications, sensor tighten sealing ring is compressed to sensor pressure inside the mouth after blocking sensors, pressure pressure medium into not to go, but suddenly flung wide when pressure seal, pressure sensor and change of stress. Rule out the failure is the best way to remove the sensor, direct look at zero is normal, if zero normal can replace the sealing ring to try again。
The third is unstable transmitter output signal. This failure is probably the pressure source of the problem. Pressure source itself is an unstable, is likely to be the instrument or the pressure sensor anti-interference ability is not strong, itself vibration is very severe and sensor fault; The fourth is the transmitter and pointer type pressure gauge control deviation. Appear deviation is normal phenomenon, confirmed the normal range of deviation。
Finally a kind of trouble is the differential pressure transmitter installation position of zero output. Differential pressure transmitter because of its measuring range is small, the transmitter in the sensing element can affect the output of the differential pressure transmitter. When installation should keep transducer pressure sensitive axis perpendicular to the direction of gravity, adjust the transducer zero after installation fixed to the standard values.
