Answer / ranjan

DPT means differential pressure Transmitter.
As name says it measure difference in pressure between two different points. So, say for example if an action is to be taken depending upon the pressure difference between these two areas (delta P), DPT only can be used not PT.
PT only measures live pressure.

Answer / rs

If we use PT then we have to use two PT at both the points
and then calculate the difference.

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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 ???

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