For example: the range of the pressure sensor is 20bar, the accuracy is 0.5%, the accuracy of the instrument is 0.2%, and the normal error is: 20bar*0.5%+20bar*0.2%=0.18bar. The possible error range should be based on the error range of the device with a large error value. In the above example, the deviation value of the sensor and the transmitter within 0.55 bar can be regarded as normal.The transmitter has no output when connected to power. The possible reasons are:1. The error value of the pressure transmitter.2. The output signal of the transmitter is unstable. There are several reasons for the unstable signal: (1) wrong wiring (check both the instrument and sensor) (2) the wire itself is open or short circuit (3) the power supply has no output or power supply Mismatch (4) The meter is damaged or the meter does not match (5) The sensor is damaged. Because of 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. Therefore, the zero position change that occurs when the differential pressure transmitter is installed The situation is normal.3. The influence of the installation position of the differential pressure transmitter on the zero output: (1) The pressure source itself is a stable pressure (2) The anti-interference ability of the instrument or pressure sensor is not strong (3) The sensor wiring is not strong ( 4) The sensor itself vibrates very badly (5) The sensor is faulty.During installation, the pressure-sensitive part of the transmitter should be made perpendicular to the direction of gravity. If the installation conditions are restricted, the zero position of the transmitter should be adjusted to the scale value after installation and fixation.
Post time: 21-09-21