beanpole_ecc
Member
I was wanting to pick the forum's collective brains here to see what other people have done. Using a ControlLogix processor.
I have a pair of flow meters both measuring the same fluid. They are paired for redundancy. Obviously if either one full scale either high or low you can tell the meter is bad and alarm accordingly. But how do you determine if the meter is gunked up or not reading correctly? I've looked on google a bit and am considering using a sort of standard deviation calculation. If the deviation gets too high I know there is a problem. There is also the method of simply taking a difference of the two. If that gets too high there is a problem. Has anyone come across this conundrum and, if so, what have you typically used in this scenario?
On an alarm, I would allow the operator to choose which meter to follow until the faulty meter could be looked at after the process is completed.
I have a pair of flow meters both measuring the same fluid. They are paired for redundancy. Obviously if either one full scale either high or low you can tell the meter is bad and alarm accordingly. But how do you determine if the meter is gunked up or not reading correctly? I've looked on google a bit and am considering using a sort of standard deviation calculation. If the deviation gets too high I know there is a problem. There is also the method of simply taking a difference of the two. If that gets too high there is a problem. Has anyone come across this conundrum and, if so, what have you typically used in this scenario?
On an alarm, I would allow the operator to choose which meter to follow until the faulty meter could be looked at after the process is completed.