Pressure Sensor Failure Solution

Pressure sensors often occurred in failure during use due to some reasons. The reasons may be the user' s own use method is inappropriate, or the external environmental factors have changed, or the quality of the sensor production is not enough, etc., which may cause the pressure sensor to failure. Here are some of the most common failures and solutions for the pressure sensor, so that everyone can find the problem rapidly.

The pressure sensor has no output

Cause of failure	Solution
Wether the power supply of the pressure sensor is reversed?	Connect the polarity of the power supply correctly.
The sensor has no power supply with 24V DC voltage and the voltage supplied to the sensor is ≥12V (Voltage at the input of the sensor power supply≥12V)	Detect the circuit of power supply and check if the instrument is selected incorrectly (the input impedance should be ≤250Ω).
If it is with a meter head, check whether the meter head is damaged. (You can short the two wires of the meter first. If it is still normal after the short circuit, it means the header is damaged).	If the meter head is damaged, you need to change the header.
Connect the ammeter to the 24V power supply circuit and check if the current is normal.	If it is normal, the sensor is normal. In this case, check if other instruments in the loop are normal.
If the power supply connected to the power input of the sensor?	Connect the power cord to the power terminal block.

The pressure sensor output≥ 20mA

Cause of failure	Solution
The sensor's power supply is abnormal.	If it is less than 12VDC, check if there is a large load in the circuit. The input impedance that the sensor load should meet RL≤(sensor supply voltage -12V)/( 0.02A) Ω.
Actual pressure exceeds the selected range of the pressure sensor.	Re-select the pressure sensor with appropriate range.
Severe overload damage the isolation diaphragm.	It’s need to be sent back to the manufacturer for repair or scrapping.
If the wiring is loose.	Connect the wire and tighten it.
Is the power cord connected correctly?	The power cord should be connected to the corresponding terminal.

The pressure sensor output≤ 4mA

Cause of failure	Solution
If the sensor's power supply is normal?	If it is less than 12VDC, check if there is a large load in the circuit. The input impedance that the sensor load should meet RL≤(sensor supply voltage -12V)/( 0.02A) Ω.
Actual pressure exceeds the selected range of the pressure sensor.	Re-select the pressure sensor with appropriate range.
Whether the pressure sensor is damaged, because severe overload sometimes damages the isolation diaphragm.	It’s need to be sent back to the manufacturer for repair.

The pressure sensor output signal is unstable

Cause of failure	Solution
The pressure source itself is an unstable pressure.	Find the cause of pressure fluctuations, usually caused by the process.
The anti-interference ability of the meter or pressure sensor is not strong.	Change the damping coefficient or view the instrument shield ground.
Wiring of the sensor is not strong.	Tighten the wiring.
The sensor itself is very vibrating.	Find the vibration source or change the installation location.
The sensor itself is faulty.	Change the sensor.

The pressure sensor indication is incorrect

Cause of failure	Solution
If the reference pressure value is correct?	Make further confirmation of the process with the process personnel.
The measuring range of the pressure indicating meter is inconsistent with the range of the pressure sensor.	Change the measuring range of the pressure indication meter or the pressure sensor.
The pressure pipe or the pressure receiving part is blocked by sand, impurities, etc.	Clean up the impurities and add a filter before the pressure interface.
The operating temperature of the sensor is -25 to 85 °C, but the temperature of the surrounding environment may exceed this range during actual use, causing the instrument to overheat and cause failure.	Add buffer tubes to dissipate heat. It is best to add some cold water to the buffer tube before use to prevent the sensor from directly impacting by the superheated steam.
Due to long-term use, the performance of the meter is degraded, resulting in zero drift.	Recalibrate the zero point of the sensor.

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