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
33923 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

TEMPERATURE VARIATION FOR FREQUENTLY.

0 Answers TVS,

what is control valve and how is work

5 Answers Descon,

Why Differential pressure transmitter is located below the tappings points for steam & condensible vapor flow measurement application?

2 Answers

Identify and use the ANSI/ISA-S5.1 consensus industrial standard process symbols.

0 Answers GAIL, Olympia,

What is the standard height for stancion supports?

4 Answers

when the operation engineer told you that he gives the control valve order to open but there is no response ! what will you do ? and if you found that there is astuck , what will you do ? (note : it is apanumatic valve )

5 Answers

give some question relative instrument fitter?

0 Answers Armco,

What are the two states of a controller

3 Answers

what is difference between profibus and field bus?

1 Answers

what difeerent between HART and BRAIN?

3 Answers

in transmiters(rose mount) how to check output 4-20ma ? and input 24v? i need exact explanation?

2 Answers Adhunik,

if drum level is low what is interlock? i mean we put interlock to fd fan or id fan ?