Radar level gauge, a level measuring instrument in the chemical industry. The radar level gauge is a radar level gauge based on the principle of time domain reflection (TDR). The electromagnetic pulse of the radar level gauge propagates along the steel cable or probe at the speed of light. When it encounters the surface of the measured medium, the radar level Part of the pulse of the meter is reflected to form an echo and returns to the pulse transmitter along the same path. The distance between the transmitter and the surface of the measured medium is proportional to the propagation time of the pulse between them, and the liquid level height is calculated.1. First check whether the full high setting value of the tank top radar level gauge is consistent with the setting value of the liquid level in the PLC program. A common phenomenon is that the parameters set by the two are different, causing the interface to display inaccurately.2. Check whether there is a problem with the display of the radar level gauge itself. The method is: observe the real-time liquid level of the oil tank and the current output value under the real-time liquid level through the liquid crystal display on the radar level gauge, and set the corresponding current full value output ratio through the radar level gauge full high level value Relations, calculate, check whether the real-time current value output by the real-time liquid level value of the oil tank is accurate. If it is wrong, it means that there is a problem with the radar level gauge itself, and it needs to be further checked for other internal parameter settings. If there is no problem in checking the settings of each parameter, you should contact the radar liquid temperature meter maintenance department to solve the related problems. The radar level gauge is a precious and precise instrument. When the cause of the fault is not judged, it must not be disassembled without authorization.3. Check whether there is any problem with the signal transmission line. When the full height setting value of the radar level gauge is consistent with the setting value of the liquid level in the PLC program, if the signal transmission line is working normally, you should see that the real-time height value of the liquid level 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. The twisted-pair shielded wires, connectors and related ControlNet network of the radar level gauge to the on-site PLC module should be checked one by one.4. When the radar level gauge and the PLC interface display value are the same, but there is always a difference with the commercial inspection ruler value, at this time, after eliminating the above faults, you can adjust the internal parameter of the radar level gauge to solve the problem. Because although the air height value of the radar level gauge is a fixed measurement value, if the original input data is measured incorrectly.
Post time: 21-09-21