Pressure transmitters are widely used in industries such as petroleum, chemical, metallurgical, power, food, papermaking, pharmaceuticals, and machinery manufacturing. Pressure transmitters have advantages such as reliable operation, stable performance, easy installation and use, small size, light weight, and high cost-effectiveness. They can be widely used in various positive and negative pressure measurements.

1. If the pressure goes up and the transmitter output cannot go up: In this case, the pressure interface should be checked first to see if there is any leakage or blockage, if it is normal. Check the wiring method, if the wiring is correct. Next, check the power supply, if it is normal. Please check if the sensor zero position has an output, or perform a simple pressurization to see if the output changes. If there are changes, it proves that the sensor is not damaged. If there are no changes, the sensor is confirmed to be damaged. Other reasons for this situation may also be instrument damage (such as PLC range setting issues, etc.).

2. The output of the pressure transmitter does not change, and if the output of the pressure transmitter suddenly changes, the zero position of the pressure relief transmitter cannot return. The reason for this phenomenon may be caused by the sealing ring of the pressure sensor, which has been encountered multiple times by our customers during use. Usually, it is due to the specifications of the sealing ring (too soft or too thick). When the sensor is tightened, the sealing ring is compressed into the sensor pressure port, blocking the sensor. When the pressure is high, the pressure medium cannot enter. However, when the pressure is very high, the sealing ring suddenly opens, and the pressure sensor changes due to the pressure. When the pressure drops again, the sealing ring returns to its original position and blocks the pressure port. The remaining pressure cannot be released, so the zero position of the sensor cannot be lowered. The * method to eliminate this cause is to remove the sensor and directly check if the zero position is normal. If it is normal, replace the appropriate sealing ring and try again.

3. The output signal of the pressure transmitter is unstable, and the cause of the fault is as follows:

(1) Due to vibration in the installation position, the sensor vibrates severely

(2) The resistance of instruments or pressure sensors is not strong

(3) The source of stress itself is an unstable pressure

(4) The sensor wiring is not secure

(5) Sensor malfunction

4. The transmitter has no output when powered on, and the cause of the fault is as follows:

(1) Wrong wiring (secondary instrument and sensor need to be checked simultaneously)

(2) Power supply has no output or power supply mismatch

(3) The open or short circuit of the wire itself

(4) Damaged or mismatched instruments

(5) Sensor damage

5. The deviation between the transmitter and the pointer pressure gauge is large. Firstly, the deviation is a normal phenomenon. Secondly, confirm the normal deviation range. The method to confirm the normal error range is as follows:

Calculate the error value of the pressure gauge. For example, if the pressure gauge has a range of 30 bar, an accuracy of 1.5%, and a minimum scale of 0.2 bar, the normal error is 30 bar * 1.5%+0.2 * 0.5 (visual error)=0.55 bar