How to properly repair the radar level gauge when the radar level gauge fails, a liquid level measuring instrument in the chemical industry. The radar level gauge is a radar level gauge based on the time domain reflection principle (TDR). The electromagnetic pulse of the radar level gauge propagates along the cable or probe at the speed of light. When encountering the surface of the measured medium, the radar level Part of the pulse is reflected to form an echo and return to the pulse transmitting device along the same path. The distance between the transmitting device and the surface of the measured medium is proportional to the propagation time of the pulse therebetween, and the liquid level is calculated.
1. First check whether the tank top radar level gauge oil level full set value is consistent with the liquid level set value in the PLC program. A common phenomenon is that the parameters set by the two are different, resulting in inaccurate interface display.
2. Check that the radar level gauge itself shows a problem. The method is as follows: the liquid crystal display on the radar level gauge is used to check the current level of the tank and the current output value under the instantaneous liquid level, and the ratio of the full current value of the corresponding level is set by the radar liquid level meter full level value. Relationship, calculate, check whether the instantaneous current value output by the tank's instantaneous liquid level value is accurate. If there is an error, the radar level gauge itself has a problem and further inspection of other internal parameter settings is required. If there is no problem in checking the setting of each parameter, the radar liquid temperature gauge maintenance department should be contacted to solve the related problems. The radar level gauge is a valuable precision instrument. When the cause of the fault is judged, it is forbidden to disassemble it.
3. Check the signal transmission line for any problems. When the radar level gauge oil level full set value is consistent with the liquid level set value in the PLC program, if the signal transmission line works normally, you should see that the liquid level instantaneous height value on the radar level gauge should be the same as the PLC interface. The displayed values ​​are consistent; otherwise, it indicates that there is a fault in the signal transmission line, and the fault detection of the radar level gauge to the on-site PLC module twisted-pair shielded wires, connectors and related ControlNet network should be performed one by one.
4. When the radar level gauge and the PLC interface display values ​​are the same, but there is always a difference with the commodity inspection scale value, then after eliminating the above various faults, the radar level gauge internal parameter empty height value can be adjusted to solve. Because the air level of the radar level gauge is a fixed value, if the original input data is measured incorrectly.
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