Interested to Buy Any Domain ? << Click Here >> for more details...
why 4 to 20 ma ,why not 0 to 20 or 3 to 15 or anything
- 19 Answers
- 47303 Views
- Honeywell, TCS, TN, I also Faced
- E-Mail Answers
Answer Posted / wilson
Most people has got the answer correct for "why 4-20mA and
not 0-20mA". Yes, it is to prevent undetected failure of
circuit or instrument.
As for "why not 3 to 15 or anything". I assumed the
question is not "why not 3-15mA" because not one use 3-
15 "mA", if really you have to ask that, you might as well
ask why not 2.314 to 33.776 mA.
3 to 15 is used, but in pneumatic system and the unit is in
PSI. i.e. 0.2 to 1.0 bar. The reason for 3PSI (or 0.2bar)
is the same as 4mA, to prevent undetected failure.
| Is This Answer Correct ? | 17 Yes | 10 No |
Post New Answer View All Answers
which type of zones used for boiler? & why ?
Why thermo wells are used? What materials are used in thermo wells?
where are following valves are applicable to install. can any valve be installed any line. globe valve butterfly valve boll valve gate valve
There are many type of control cable like pair,core,tried, What are defination each one
why would you like to join our company
How many are the types of instrument cables in terms of No. of pair.
pls provide me syllabus and old question paper of instrumentation engineering for GET(JSPL)
How can i test procedure grounding for CAT-7 cable? Or How can we test procedure CAT-7 Cable Electrically safe?
Identification of control valve parts.
Where are oxygen analysers installed in cfbc boilers? What are their usual readings?
Can anyone convert a 5/2 way or 3/2 way valve into an ISO valve?
Hi, Is there any smart plant instrumentation design training institute in Bangalore?
What is the exact differences between HART,FOUNDATION FIELDBUS,PROFIBUS?
What do you know about gail?
What is 1:1 redundancy ?
