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What are the common faults of Thinfilm Flush Pressure Transmitter? How to troubleshoot?

Publish Time: 2024-07-10
The common faults of Thinfilm Flush Pressure Transmitter and their troubleshooting methods mainly include the following aspects:

1. Common faults

Abnormal pressure display value

Cause: It may be caused by various factors such as zero drift, range migration, component damage, sensor failure, line failure, electromagnetic interference, pressure pipe/capillary problem, etc.

Troubleshooting method: It is necessary to check each item, including whether the diaphragm of the sensor is deformed or damaged, whether the line is in good contact, whether the electromagnetic environment is interfered, etc. For the pressure pipe and capillary, regular cleaning and maintenance are required to prevent blockage and leakage.

Component damage

Cause: It may be caused by short circuit or open circuit caused by lightning strike, excessive voltage, wrong line connection or cable damage. In addition, water inflow into the instrument may also cause corrosion of internal electronic components.

Troubleshooting method: Replace damaged components or cables in time, and check whether there is a problem with the instrument grounding system. If the damage is caused by water inflow, the transmitter needs to be sealed.

Sensor failure

Cause: The diaphragm of the diaphragm pressure transmitter may be deformed and damaged due to crystallization of the medium or the presence of blocky solids.

Troubleshooting: Replace the diaphragm in time, and consider adding purge or adding filters at the front end according to the actual working conditions.

Line failure

Cause: Internal wiring problems may cause poor signal transmission.

Troubleshooting: Use multimeters and other tools to measure resistance, voltage, etc. to check and ensure the correct connection of the line.

Electromagnetic interference

Cause: When the signal cable of the instrument is close to and parallel to the electrical high-voltage signal cable, signal interference is prone to occur.

Troubleshooting: Ensure that the signal cable is kept at a certain distance from the electrical high-voltage signal cable and take shielding measures. At the same time, the installation location of the transmitter should also avoid strong magnetic/electric fields or strong vibration sources.

No output or abnormal output

Cause: It may be that the power supply is connected in reverse, the power supply voltage is insufficient, the meter head is damaged, the wiring is loose, or the power cord is connected incorrectly.

Troubleshooting: Check whether the power supply polarity and power supply voltage meet the requirements, check whether the meter head is damaged, and whether the wiring is firm. If the problem still exists, it may be necessary to further check the internal circuit of the transmitter.

2. Troubleshooting steps

Check the power supply

Confirm whether the power supply polarity is correct and whether the power supply voltage meets the requirements (usually ≥12VDC).

Check the sensor

Observe whether the sensor diaphragm is deformed or damaged, and replace it in time if necessary.

Check the circuit

Use tools such as a multimeter to check whether the circuit is in good contact and there is no short circuit or open circuit.

Check the electromagnetic environment

Ensure that the signal cable is kept at a certain distance from the electrical high-voltage signal cable and take shielding measures.

Check the pressure lead pipe and capillary

Regularly clean and maintain the pressure lead pipe and capillary to prevent blockage and leakage.

Other inspections

Problems such as damaged meter head and loose wiring also need to be checked and handled one by one.

Through the above steps, common faults of Thinfilm Flush Pressure Transmitter can be systematically checked and solved. If the problem is more complicated or difficult to solve, it is recommended to contact professional maintenance personnel for processing.
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