The normal operation of the instrument is inseparable from the on-site maintenance relationship, especially some important process links, once there is a leak, it will greatly affect the quality of the product, resulting in heavy losses.
First of all, the important tank will generally be installed at the same time remote and field indication type of level gauge, in this case to check and judge the failure of the liquid level gauge *** intuitive way is to compare with the field local level gauge, because the structure of the local level gauge is purely mechanical, the reliability is extremely high, so observe whether the display value of the instrument and the trend of the liquid level change is consistent with the grounding level gauge can basically judge whether the radar level gauge is operating normally.
Continue to observe the historical data chart of the instrument, check its fluctuations, when the number of indicators suddenly increases, fluctuates violently or remains dead for a long time, you can adjust the process parameters according to the situation to detect whether the instrument function is normal, and you can roughly judge whether there is a failure.
If the liquid level display value remains at the alarm value, *** large value or *** small value, check the transmitter first. If the transmitter is normal, it can be judged that the display meter is faulty. When the output of the transmitter is basically the same as the display of the DCS, the liquid level control system can be changed to manual operation, the opening of the regulating valve can be changed, and the change of liquid level can be observed.
When the process liquid level changes, the instrument has no output, the liquid level display is small, and the liquid level display is large, the connection between the transmitter and the display instrument or DCS card should be checked. At the same time, the balance container is inspected. Check that the condensate and isolation fluid have not been washed away. Check the radar level gauge transmitting antenna and its surroundings for scale, water droplets, etc. This phenomenon prevents microwaves from actually transmitting to the actual level. Interference can usually be eliminated by a simple wipe.
When the liquid level display or recording curve fluctuates greatly and quickly, it may be caused by improper PID parameter setting. Improper damping setting of the transmitter and leakage of sampling valve and pressure pipe will cause fluctuation of liquid level display curve.
At the same time, the state of the instrument can be judged according to the data change rate of the level gauge, but it should be noted that the radar level gauge belongs to the liquid level instrument with the principle of echo difference ranging, and the change rate of its parameters is related to the actual situation of the measurement environment, which needs to be judged according to certain experience, such as the level of the boiler steam drum changes quickly, and the level change of the liquid storage tank is relatively slow. Sudden large changes and fluctuations in the liquid level display, *** large or *** small display, the possibility of instrument failure is high.
Level Measurement*** is afraid of the appearance of false liquid levels. When there is a suspicion of a false liquid level phenomenon, it must be judged calmly; Switch the control system to manual operation, inspect or calibrate transmitters and systems, and check pressure lines and valves for problems until a problem is found.
When the liquid level is low, the float level gauge should check whether there is sediment in the main pipe, otherwise it should be purged with blowdown. The buoy level gauge can be used to flush the buildup on the buoy by draining it and check for blockages. The blowing level gauge should check whether there is any leakage in the air source line.
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