Answer / qamar_alam

close loop means there is feedback.

what is the significance of hook up

3 Answers  

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WHAT IS THE DIFFERENCE B/W PLC and DCS

10 Answers   Bhel,

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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 ???

2 Answers   National Petrochemical Company,

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any thing about plcs?

4 Answers  

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What are the different modes of a contollogix family processor? How they work?

3 Answers   Honeywell, Siemens,

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what is difference between Floating D.C.Voltage and Fixed D.C.Voltage?

2 Answers  

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what is the reason for flow fluctuations happen on differential flow transmitter during in service

2 Answers  

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what is meant by control valve sizing?

3 Answers  

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Tell about your IFFCO plant visit.

0 Answers   L&T,

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can we use flow transmitter instead of level transmitter?

7 Answers  

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NPN transistor, SCR, Zener diode, LED, Varactor diode, Vortex meter, RTD, Resistor, Crystal

0 Answers   CCIE, RTD,

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What's the Installtion procedure of DP Transmitter for Gas,steam and water?

2 Answers  

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