Answer / jeff hawley

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why we use 4-20 mA for calibration of the instruments.why we cant use 0-20 mA?

5 Answers  

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what is lead lag compensator and for wat v using that???

3 Answers  

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What is the maximum distance limit of 4-20mA and 0-10V DC standard signal transmission ?

3 Answers   BARC, ME,

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whats the abbreviation of IOP? is it instrument of power or input open problem?

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Specify ideal accuracy of flow element like orifice plate, Ventury, Annubar. Ultrasonic flow meter etc.

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How we are blocking 40 kg or more pressure through only 6 kg instrument air in control valve 

3 Answers  

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what is the difference between Digital output DO signals /Commands for start/stop and Solenoid valves ??

1 Answers  

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Explain working principle of lvdt?

0 Answers  

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In control valve there are two type of valve seat we can use metal to metal seat & soft seat.On this valve seat i have following doubt. 1)I have never seen practically the internal assembly of valve so my doubt is that basically weather the seat is soft seat or metal its basic MOC is same as valve body(SS or CS) only in soft seat we are using PTFE ring & place on valve seat & in metal this PTFE ring is not threr am i correct??????? 2)what are the common general rule for using metal to metal seat & soft seat,means its depend on process parameter like liquid,gas, steam & on valve leakage class.

1 Answers  

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role of electrical engineer in the instrumentation industry

1 Answers  

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What is furnace draft control?

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what are the documents(Construction point of view for a process plant) submitted by contactor initially entering in to new site for client?

0 Answers   NTPC, PSU,

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