why the output sugnal is 4-20 ma and not 4-25 ma?

5 Answers  

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what is difference between wheatstone bridge, pirani gauge and strain gauge ??? explain its principle and working

4 Answers  

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What is Cavitation in a control valve?

0 Answers   CCIE, KN,

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Can any body help me,The GE Mark V control system is windows based or Dos based?

3 Answers  

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If fire would be inside the plant which fire detector is to detected the fire.

0 Answers   KOC,

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1. What is the main differences between GE Mark IV and Mark V Turbine Control System? 2. what is the main differences between GE Mark V and Mark VI?

2 Answers   GE,

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I have installed a RTD whose length is 2250mm(RTD stem length), but it's upper 200 -250mm is out of the reactor, and this upper 200mm stem is surrounded by atmospheric temp. And the lower portion i.e. 2000mm is in contact with the measuring fluid, then does the final measuring temp. Gonna change as the upper 200mm RTD stem is out of reactor?

1 Answers   Process Control Technologies,

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Why do we floating DC in DC system.

0 Answers  

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what is vfd(variable frequency drive)?type of vfd.

2 Answers  

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How to Calibrate Penumatic Transmitter.LRV= -60 URV= -20.Can u give me Answer.

9 Answers   ABB,

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there are two candidates p and q in an election.During the campaign,40% of the voters promised to vote for P ,and rest for Q.however, on the day of election 15% of the voter went back on their promise to vote for P and instead voted for Q. 25% of the voters went back on their promise to vote for Q and instead voted for P.suppose,P lost by two votes,then what was the total no. of voters.

4 Answers   GATE,

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Good Evening all.My question is - For a feed water line to an equipment if i need to measure the flow we will use orifice /magnetic/vortex depend on cost/spec.If i need to measure a ''Alarm''signal and ''Interlock'' from one point i think we can use orifice type in one location with 2 different tapping points - one for alarm and one for an interlock to flow valve..If in case i need to have both these signals(Alarm & interlock) from magnetic flow meter,is it possible??will 2 seperate sensors will be located inbuilt r we can program it ??..i thk we can have one transmitter with these 2 signals...need to know any technical issues are there?pls clarify

3 Answers  

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