Wuxi level transmitters, as the core equipment for measuring liquid levels in industrial production, are widely used in fields such as chemical engineering, water treatment, and power. Its operational stability directly affects production efficiency and safety, but in long-term use, various faults are prone to occur due to factors such as medium characteristics, installation environment, and improper maintenance. This article summarizes six common faults and corresponding solutions based on practical application scenarios, providing reference for industry practitioners.
1、 No output signal fault
No output signal is one of the most common faults of transmitters, often caused by abnormal power supply, line faults, or equipment damage. Firstly, the power supply should be checked to confirm whether the 24V DC power supply is stable. If the voltage is lower than 22V, the power module should be repaired or the power supply line should be replaced in a timely manner. Next, check the signal circuit to see if there are any broken or short circuited cables, and if the wiring terminals are loose or oxidized. It is recommended to re tighten the terminals and seal them with waterproof tape. If there are no problems with the above inspection, it may be due to damage to the internal circuit of the transmitter. It is necessary to contact the Wuxi manufacturer for factory repair or replacement of the sensor core.
2、 Large measurement accuracy deviation
Accuracy deviation can lead to distortion of liquid level data, affecting production control. The main causes of this malfunction include calibration failure, improper installation position, and media interference. When solving the problem, first perform zero calibration and range calibration again, compare and debug with a standard level gauge to ensure that the error is within the allowable range (usually ≤± 0.5% FS). In terms of installation, it is necessary to avoid the transmitter probe being close to the container wall or in turbulent areas. It is recommended to install it in the middle of the container with a stable liquid level and maintain a distance of more than 30cm from the bottom of the container. For viscous and easily crystallizable media, the attachments on the surface of the probe should be regularly cleaned to prevent the medium from wrapping and affecting the detection accuracy.
3、 Frequent fluctuations in the output signal
Signal fluctuations are often related to environmental interference, loose installation, or medium characteristics. In industrial sites, electromagnetic interference generated by equipment such as frequency converters and motors can affect the transmission of transmitter signals. Therefore, signal cables need to be shielded and separately wired away from power cables, with the shielding layer grounded at one end. If the installation is not secure, equipment vibration can cause probe displacement. The installation bracket should be reinforced to ensure a tight connection between the transmitter and the container. For media that are prone to foaming and boiling, a transmitter with damping adjustment function can be used to stabilize the output signal by adjusting the damping parameters (usually 0.1-10 seconds).
4、 Range drift fault
Range drift is common in equipment that has not been calibrated for a long time or is used in high temperature and high humidity environments. When solving the problem, first restore the transmitter to its factory settings, and then perform zero and range calibration. During the calibration process, it is necessary to simulate the actual working conditions of the medium temperature and pressure. If the drift is frequent, it is necessary to check the sealing performance of the equipment, replace the aging sealing ring, and prevent water vapor from entering the internal circuit. For transmitters that have been in use for more than 3 years, it is recommended to regularly send them to a professional testing institution in Wuxi for accuracy calibration, and replace the sensing elements if necessary.
5、 Probe corrosion damage fault
In some industrial scenarios in Wuxi, the medium contains acidic and alkaline components, which can easily cause probe corrosion. To prevent such malfunctions, corrosion-resistant materials (such as 316L stainless steel, PTFE) should be selected for the transmitter, and the appropriate probe type should be chosen based on the characteristics of the medium. In daily maintenance, regularly check the surface of the probe for corrosion spots and damage, and replace it promptly if any problems are found. For strongly corrosive media, an isolated installation method can be used to avoid direct contact of the probe with the medium.
6、 Display abnormal faults
Displaying garbled characters or no display is often caused by power failure or damage to the display module. Firstly, check if the power supply voltage is normal. If the power supply is normal, it may be due to a loose connection between the display panel and the motherboard. Disassemble the device and re plug the connection plug. If the problem still cannot be solved, it may be due to damage to the display module. Contact the Wuxi manufacturer to replace the parts. In addition, when used in harsh environments, equipment protection should be taken to prevent dust and water vapor from entering the display module.