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
- 48125 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
Whatis the reset ofset and control system in instrumentation
anybody having Qatar Petroleum questions for instrument Technician offshore ....please send me
how to work MIL contol valve posistioner ?
WHAT IS TMXT IN TEMPERATURE FOUNDATION FIELDBUS.
principle of automatic votage regulator
Is there any relation between Artificial Intelligence and Instrumentation?
Explain types of valves?
where i can get training in INTOOLS and PDMS in Delhi-NCR OR north part of India. please reply with ur ans. at arunsamkaria@ymail.com
how many pulses are required by a ac induction servo motor of 4 poles with 50 Hz frequency to rotate by 1 degree?
Which Signal hart communicator work? If there any signal change when hart connect while transmitter in line ?
How d.p. Transmitter can be applied to open tank?
Turbidity analyzer working principle ?
Using your own examples solve a problem involving normal table. (experimental method and analysis)
Specify ideal accuracy of flow element like orifice plate, Ventury, Annubar. Ultrasonic flow meter etc.
How will you calibrate an Absolute Pr.Transmitter of range 400mmHg absolute ?
