Interested to Buy Any Domain ? << Click Here >> for more details...
why do we use 4-20mA as o/p and why don't use 0-20mA or 5-
21mA?
- 3 Answers
- 9061 Views
- I also Faced
- E-Mail Answers
Answer Posted / ahmed eid
Ohm's law voltage = current * resistance
of the standerd voltage in the dcs from 1 to 5 voltge
and the standerd resistance of loop 250 oums
so
V=I*R
the first in the low signal 1 volt
1(v)=I*250(r) =.004 A
.004*1000 = 4 MA
the sacand in the high signal 5 volt
5(v)=I*250(r) = 020 A
.020*250 = 20 MA
| Is This Answer Correct ? | 19 Yes | 0 No |
Post New Answer View All Answers
How to calibration coriolis flow meter?
what is 24vdc live and dry supply
OBJECTIVE TYPE QUESTIONS OF ANALYTICAL INSTRUMENTATION
A valve in series with an orifice plate (DP transmitter), is aligned for constant pressure in the pipeline, if there is an error dx, How to align it in process.
how to convert MA in to measuring values..and how mwasuring values into MA ?..plz ansr.i have intervw
How to Calibrate Temperature Switch in field
What is the difference between uv and ir scanners? and what is the workig principle of both
can any one explain in which term we are flow flow is it volumetric r is it mass? and y
what is scale factor of proximitor & unit of the vibration.
I have got a call of IOCL interview for projects having 2yrs experience. What sort of questions should I expect in the interview?
If a warning lamp will operate with the ground circuit is bypassed with a jumper wire to ground, what should you check?
this site is owned by an nonsense
Is it ok, to use non-contact type Radar type LT, on a tank that is half circular from the bottom side? If yes the, isn't the waves gonna bent in other directions?
I have a Control VAlve having size of 2 ".Only the known parameter is Pressure drop . Its 2 Kg. Then How to calculate control valve sizing means Cv.
How do you identify an orifice in the pipeline?
