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|We do have a problem in the company that is one PT connected to PlC which is mean 1 out of 1 in PLC system we do have the PAHH is 55 mbar and PALL 8 mbar with a timer of 15 sec for the PAHH the problem started when PAHH goes more than the set point which is 55 it reached up to 71 but due to timer doesn't trip . We force it and we checked everything nothing there . We replaced the transmitter problem still there the reading goes more than the 55 bar the range for transmitte is 0- 60 mbar . So we did loop check , aculaizing valve , wiring all are okay . What the possible causes for this ???
|how can we measure the level measurement with the help of
|please explain clearly in PID controller if We increase P
only what will be action of the contrlere.
|wht is mean by dpt(differential pressure transmitter)
|why we cant transmit the dc current easily
|what is meant by calibration
|when the operation engineer told you that he gives the
control valve order to open but there is no response !
what will you do ?
and if you found that there is astuck , what will you do ?
(note : it is apanumatic valve )
|what is thermocouple output
|why the discharge pressure of ID fan showing negative at fan
running condition.(boiler operating condition.)
|Regarding MOS (maintenance override switch), I want to know
its function and its state ( 1 or 0 when not activated ).
An example will be very helpful..thank you.
|Explain the difference between the types of input variables plc?
|what are the on/off valve precaution?
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