Pressure Sensor FAQs

• Categories:Industry information
• Time of issue:2024-09-30 15:18

(Summary description) 1、After pressurization, the transmitter output does not change?   A: In this case, you should first check whether the pressure interface leakage or blocked, if it is not confirmed, check the wiring, such as wiring and then check the power supply, such as the power supply is normal and then look at the sensor zero output, or simply pressurized to see whether the output changes, there is a change to prove that the sensor is not damaged, if there is no change in the sensor that has been damaged. Other reasons for this situation may also be damaged instrumentation, or other parts of the system.     2, pressurized transmitter output does not change, and then pressurized transmitter output suddenly change, the pressure relief transmitter zero can not go back?   A: The cause of this phenomenon is very likely to be caused by the pressure sensor seal, generally because of the seal specifications (too soft or too thick), the sensor is tightened, the seal is compressed to the sensor inside the pressure port to block the sensor, pressurized pressure medium can not enter, but the pressure is very large when a sudden rush to open the seal, the pressure sensor by the pressure and the change, and the pressure is reduced again, the seal is back to block the pressure port, and the residual pressure is not able to change the output of the pressurized transmitter. When the pressure is lowered again, the sealing ring will return to block the pressure-inducing port, and the residual pressure will not be released, so the sensor will not be able to come down to the zero position. The best way to rule out this reason is to remove the sensor, directly see if the zero position is normal, if normal, replace the sealing ring and try again.     3, the transmitter output signal is not stable?     A: The output signal is not stable for the following reasons:        A, the pressure source itself is an unstable pressure;        B, the instrument or pressure sensor anti-interference ability is not strong (to confirm whether there is a source of interference around, such as motors, inverters, etc.);        C, the sensor wiring is not secure (poor or broken cable wiring, need to be rewired);        D, check the equipment grounding (induced voltage will make the sensor or instrument shell charged);        E, sensor failure;     4, the transmitter is connected to the power no output?   A: The possible reasons are:        A, connected to the wrong line (instrumentation and sensors should be checked);        B, the wire itself is broken or short-circuited;        C, no output from the power supply or power mismatch (check whether the input power supply meets the power supply range);        D, meter damage or meter mismatch;        E. Sensor damage;     5、Sensor connected to the meter, no output display?      A: Sensor connected to the instrument, no output display, you can test the sensor and the instrument to confirm which part of the fault;           Disconnect the sensor and instrument signal output line, first check whether the sensor output is normal;                 Current signal and voltage signal output can be tested according to the above chart, if the zero position is normal, slowly pressurize the sensor to see if the output value changes, if the output value changes, that is, the sensor is normal, can be judged as a meter failure. (For mV signal output sensor, can also be used in this way). Sensor power supply can be used separately external power supply or instrument power supply to see if the sensor output is normal.   6、Differential pressure transmitter installation position on the zero output of the impact?   A: Differential pressure transmitter due to its small measuring range, the self weight of the sensing element in the transmitter that will affect the output of the differential pressure transmitter, so the installation of differential pressure transmitter zero change is a normal situation. When installing the transmitter, the axial direction of the pressure sensitive parts should be perpendicular to the direction of gravity. If the installation conditions are limited, the transmitter zero position should be adjusted to the standard value after installation and fixation.       7, the transmitter output ≥ 20mA?   A: The possible reasons are:        A. Check whether the actual pressure exceeds the selected range of the pressure transmitter;        B, sensor overload caused by (serious overload sometimes damage the isolation diaphragm);        C, sensor failure;