Instrument failure
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How can operators determine if instruments are malfunctioning? Such as false readings from the level gauge, malfunctioning flow meters and thermometers?
Based on the actual operating conditions, if the readings seem inaccurate, it is advisable to install an on-site standard gauge for comparison if possible. Without any conditions, check the nearby tables for comparison. I just couldn’t believe it, so I had the gauge sent for inspection.
Generally, there is a form of comparison: for liquid level, comparison is made using the flap gauge on site (for open containers, manual measurement can be used for comparison); for temperature, a bimetallic thermometer on site is used for comparison (thermistors and thermocouples can also be used to obtain accurate values for comparison); for pressure, a Bourdon tube pressure gauge on site is used for comparison, and so on
Personally, I think it’s quite intuitive to check whether there are any sudden changes or extreme values in the trend
There are many related parameters; with careful comparison, they will definitely be found
To determine whether a gauge is malfunctioning, first check if it shows any abnormal readings, and then make a comprehensive judgment by taking into account fluctuations in other process parameters as well.
Check whether there are any abnormal readings on the gauge, and compare them with other measurement devices on site, such as magnetic flip switches and manual gauging methods. Based on the relevant experience of process engineers, check the instrument trends for reference