canu tell me why 4-20 ma and why not this 3-25ma?please give reason of this value.

6 Answers  

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While giving Power Supply of 24 VDC to a Transmitter,why Shield Terminal is connected either at Transmitter or at ISB.Why not Shield Terminal connected at both ends.If the Reason is to avoid Noise interference,which type of noice that is interfering.Is the Noice from the 24 VDC supply terminals or from any external source.

1 Answers  

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what is temperature compensation?

1 Answers  

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how the presure switches are calibrated? and what happen inside?

1 Answers  

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What is the formula to convert mv to temperature in k type thermocouple?pls simply elaborate? I got one ans.it is Temp=mv×25°+atmospheric temp,but here what is 25°,i confusef ,so pls????

2 Answers   HPCL,

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Is it possible to convert 4 wire transmitter to convert to 2 wire with additional relay.Please send detial with drawing,i will appreciate.

2 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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what is the function of a zener diode ?

2 Answers   Honeywell,

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What is the difference between fire detector and smoke detector?

5 Answers  

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what is the difference about HART, and 4-20mA signal?

8 Answers  

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in the construction field why hook up s.s.tubing for transmitter using upto 6mtrs of closed loop, but y not open loop nomore restriction

5 Answers   Sabic,

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1.In which princeple DP transmeter works? 2.Why UPS system is use for DCS? 3.How drum lvel controller works? 4.What is the difference between glob valve and gate valve? 5.How axial shift probe work & in which princeple it works?

1 Answers   Luberef, Qatar Gas, Reliance,

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