Differential Pressure Transmitter Common Faults and Solutions:
The differential pressure transmitter is a remote pressure measuring instrument that converts the pressure difference into a DC standard signal. It is widely used in industrial production and scientific research and is a hardware for acquiring, processing, and transmitting various kinds of information. In the measurement process, there are often some failures that need to be solved in time so as not to affect the normal operation of production (equipment) . The following lists some common faults and their solutions. We hope to help everyone.
One, line failure
When the value displayed on the computer is abnormal, first open the differential pressure transmitter's junction box, check whether the line is virtual, short or disconnected. You can determine the fault by measuring the power, measuring resistance, and shaking insulation. deal with.
Second, the acquisition module or differential pressure sensor failure
When troubleshooting the line, it depends on whether the acquisition module or differential pressure sensor is faulty. Use a multimeter to check whether the differential pressure transmitter operating power is normal, and at the same time, measure whether the output voltage of the differential pressure transmitter is within 4mA to 20mA (if the output voltage value is measured, whether the measurement is in the range of 0-5V), and confirm whether the output value is normal. If there is no output value, the differential pressure transmitter is damaged and the differential pressure transmitter needs to be replaced. If the on-site measured value conversion matches the actual experience value, there will be no problem with the field instrument and the measuring point, the module is damaged, and the module needs to be replaced. When the field measured value conversion is the same as the computer display value, there is a problem with the pressure tube or differential pressure transmitter.
Third, the pressure tube failure
1, pressure tube plugging
In the actual production and use and maintenance, due to the timeliness of the discharge, or the medium is dirty, sticky, or with particles, powders, etc., it takes a long time, and some will solidify, causing the pressure tube to be clogged and the measurement cannot be performed normally. Therefore, in order to ensure the normal operation of the transmitter, it is necessary to periodically try to clear the pressure tube.
2, the pressure pipe leakage
Due to the fact that the differential pressure transmitter contact, stop valve and other accessories are compared duo, the leakage point increases duo, and the maintenance workload increases. Therefore, it is necessary to reasonably do a good job of anti-corrosion of the pressure pipe and reduce the occurrence of trachoma in the pressure pipe. The screws on the interface of the pressure pipe should be tightened to prevent loosening.
3, pressure tube effusion
Because the pressure of the gas flow is not taken or the installation of the pressure tube is not in compliance with the requirements, the phenomenon of liquid accumulation inside the pressure tube is often caused. The appearance of this phenomenon will often result in inaccurate measurements. If the transmitter's range is very small, it may even cause some fluctuation in the output of the transmitter. Some literatures have pointed out that the correct installation of the pressure tube should be continuous with the gradient with the level not less than 1:12, there is a height difference between the measurement point and the installation point, and the pressure taking point should be perpendicular to the wall of the device under test. In order to make the measurement more accurate, several pressure measuring heads can be set. All the pressure measuring heads are connected together to form a pressure equalizing pipe, which is then led out through the pressure guiding pipe. A discharge valve is arranged at the lowest point of the pressure equalizing pipe.
In addition, during the actual production and use of the site, there will also be problems such as the heat-supply of the pressure pipe and the reverse of the pressure pipe.
4, frequency conversion interference
In the process of field installation and wiring, various signal cables are bundled together or take the same multi-core cable, and the signal will be disturbed. In particular, the signal line and the power line will interfere with one another in a long pipeline. In this case, the differential pressure transmitter will appear on the scene without communication, or even misinformation. Therefore, similar misoperations should be avoided during installation, and the distance between the instrument cable and the power cable tray should be increased.
5, electrical signal transmission failure
Because there are certain differences in the level of installation, use, and maintenance personnel, in order to save manpower, material resources, financial resources, or consider other factors, the differential pressure transmitter is often placed near the device under test, causing the transmission distance of the electrical signal to be too far, making There is a phenomenon of interference and attenuation of electrical signals. Therefore, it is necessary to appropriately increase the cross-sectional area of ​​the cable to solve this problem.
 
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