How to deal with the liquid level displayed in the DCS control room being higher than the actual liquid level

What should I do if the DCS liquid level display is higher than the actual liquid level? DCS is also called decentralized control system, centralized management, decentralized control. There is a liquid level transmitter for on-site measurement of liquid level, which outputs a 4-20mA signal. Since the display is inconsistent, and it is high. The transmitter problem can be solved first. The signal output is directly measured on the spot, and then converted into the liquid level height according to the range of the transmitter. One is to compare with the displayed value of the transmitter. If the display is consistent, the analog signal output of the transmitter is normal. The signal transmitted from the field is then compared with the previous measurement in the DCS cabinet. If the display is consistent, it means that the signal transmission line is normal. At this time, the signal from the field to the analog input module of the DCS cabinet is normal, you can connect this point to other analog input points, and try the replacement method. If it is normal, it may be related to the configuration of this channel or change point of the analog input module. For the convenience of checking the configuration of the point change first, call up the point change screen on the monitoring screen, and record the range. Then, change the point in the analog input module of the DCS cabinet to communicate with the transmitter, and check whether the range of the transmitter is consistent with the range of the DCS. If they are consistent, it may be that there is a problem with changing the channel of the analog input module. On the contrary, the range setting is wrong. The liquid level in the DCS room is higher than the scene, it is likely that the configuration range of the DCS is too high, causing the value in the control room to be higher than the scene. If the liquid level transmitter adopts a double flange isolation diaphragm box transmitter, the height of the container is 100cm, the medium is water, and there is no migration. ΔP=10 kPa. Therefore, the transmitter sets the range of 0-10Kpa, corresponding to 0-100cm, and the output signal is 4-20mA. Assuming the site height is 50cm, the output signal is 12mA. At this time, since the range set by the DCS is 0-120cm higher, the DCS displays 60cm at this time. It can be seen that when the range of the DCS end is set high, the display must be higher than the scene.

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