Why we use 4 to 20 mA, (This is International Standard) instaed of this can we

Why we use 4 to 20 mA, (This is International Standard)
instaed of this can we use 4-16, or 4-24 or 3- 15 or any
other range

Question Posted / abi.inst

13 Answers
33382 Views
ONGC, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

Why we use 4 to 20 mA, (This is International Standard) instaed of this can we use 4-16, or 4-24 o..

Answer / amit kr jain

We use 4-20 mA range as a standard bcoz we know very well
when there is no input i.e. output must be 4 mA otherwise
instrument is giving wrong output(i.e. instrument not
having proper calibration).
-Amit

Is This Answer Correct ?

14 Yes

32 No

Why we use 4 to 20 mA, (This is International Standard) instaed of this can we use 4-16, or 4-24 o..

Answer / elayaraja

We use 4-20 mA range as a standard bcoz we know very well
when there is no input i.e. output must be 4 mA otherwise
instrument is giving wrong output

Is This Answer Correct ?

1 Yes

22 No

Why we use 4 to 20 mA, (This is International Standard) instaed of this can we use 4-16, or 4-24 o..

Answer / r natarajan

4-20 mA signals are possible to divide equally, 0-4 mA as
close loop checking.

Is This Answer Correct ?

3 Yes

37 No

Post New Answer

More Instrumentation Interview Questions

the whole paper was based on Transducers..questions like define repeatability, error,accuracy,precision..den there were many q. on the conversion of Pa to mmHg and other units.. also..der wer few Q. on some level sensors(with diagram)

0 Answers GNFC,

where proximity sensor installed on tank in loading arm application

0 Answers

What is the principle of a Pressure gauge?

2 Answers CCIE,

Working principle capacitance type level transmitter

3 Answers

what is sequence table in DCS . make a logic in sequence table for tripping of ID fan in Boiler(in YOKOGAWA CS 3000 DCS).

1 Answers Yokogawa,

If the on Of the DO module is off in the System cabinet, then what is the Procedure to check weather the Module is working or not.

2 Answers Honeywell,

what do we mean by hook up drawing. what r the information we get from it?

7 Answers Reliance,

What is the absolute temperature

2 Answers

How it the difference between force balance system and dispalacement balance system?

0 Answers

what is the difference between attemperator and desuperheater ?

0 Answers

what is the equation for gas flowmetering? whic includes gas flow, pressure, and temperature.

2 Answers

while stroke checking of a linear control valve ,found its travel is in non linear ,what can be possible reason ? ( please answer send in mannanali65@gmail.com) pls pls pls if any body know

2 Answers JAL International,

For more Instrumentation Interview Questions Click Here