Jiangsu Shangrun Shares Pressure Transmitter Common Faults and Solutions

Pressure transmitters are widely used in petroleum, chemical, metallurgy, electric power, food, paper, medicine, machinery manufacturing and other industries. Pressure transmitter has reliable operation, stable performance, easy installation and use, small size, light weight, high performance-cost ratio, and can be widely used in various positive and negative pressure measurements.

1, pressure up the transmitter output can not go: this situation, you should first check the pressure interface is leaking or blocked, as normal. Check the wiring method, if the wiring is correct. Next check the power supply, if the power supply is normal. Check if there is output from sensor zero, or simply pressurize to see if the output changes. There is a change to prove that the sensor is not damaged, if no change sensor confirms damage. Other reasons for this may be damage to the instrument (such as PLC volume setting issues, etc.).

2, pressure transmitter output does not change, and then pressurize the transmitter output suddenly changes, pressure transmitter zero can not go back. The reason for this phenomenon may be caused by the pressure sensor seal, which has been encountered many times in our customers' use. Normally because of the sealing ring specification (too soft or too thick), when the sensor is tightened, the sealing ring is compressed to the inside of the sensor pressure port to block the sensor. When the pressure is applied, the pressure medium cannot enter, but when the pressure is high, it suddenly bursts open. In the seal ring, the pressure sensor is changed by the pressure, and when the pressure is reduced again, the seal ring is returned to block the pressure-reducing port, and the remaining pressure is not released, so the sensor zero position cannot be reached again. The best way to eliminate this reason is to remove the sensor and see if the zero position is normal. If the proper seal is properly replaced, try again.

3, pressure transmitter output signal instability, the cause of the failure is as follows:

(1) The sensor vibrates due to vibration at the mounting position

(2) The instrument or pressure sensor does not have strong anti-interference ability

(3) The pressure source itself is an unstable pressure

(4) The sensor wiring is not strong

(5), sensor failure

4. There is no output from the transmitter and the cause of the fault is as follows:

(1) Connect the wrong line (need to check the secondary instrument and sensor at the same time)

(2) No power output or power mismatch

(3) Breakage or short circuit of the wire itself

(4) The meter is damaged or the meter does not match

(5) The sensor is damaged

5. There is a large deviation between the transmitter and the pointer pressure gauge. First, the deviation is a normal phenomenon. Secondly, confirm the normal deviation range and confirm the normal error range:

Calculate the error value of the pressure gauge. For example: pressure gauge span 30 bar, accuracy 1.5%, minimum scale 0.2 bar normal error: 30 bar*1.5%+0.2*0.5 (visual error)=0.55 bar

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Posted on January 17, 2020