why we use 4-20 mA to do calibration of the instruments.why
we cant use 0-20 mA?
- 8 Answers
- 21503 Views
- Emerson, IEM, I also Faced
- E-Mail Answers
Answer Posted / naresh yadav
Module require 1-5 v for further processing thats why we
use 4 - 20 mA because with 250 ohms resistance we can
easily convert 4 - 20 mA into 1 - 5 V
.04 A x 250 ohms = 1 V
.2 A x 250 ohms = 5 V
if we use 0 - 20 mA it converts 0 - 5 v but we required 1 -
5 v for further processing in module.
| Is This Answer Correct ? | 21 Yes | 35 No |
Post New Answer View All Answers
How to calibrate capillary type level transmitter
what is droop in governer ,type of droop ,how it work
How to regulate the flow of Air in 4" line, with max flow of 330 nm3/hr and Pressure of 0.5 bar? please suggest the type of instrument required.
WHY THE DEGREE OF VALVE PLUG AND VALVE SEAT IS SLIGTLY DIFFERENT I CONTROL VALVE TRIM DESIGN
Explain why use mmwc unit?
in natural gas indirect water bath heater,how to prevent the problem of backfire from firetube during ignition...becoz of this backfire performance of wbh is going low.
what is the vital subject for scoring bhel exam&what is the question pattern
our kks tagging is crossing more than 12 character please suggest how to take tags in the DCS
We Have Two Field bus Pressure Transmitters of Different Sensor Range (I.E One is of Lower range and Another is of Higher Range).Is same Process Line. My Question is Can i provide Saturation Limit to my field Bus Transmitter as We can provide Saturation current limit to HART Instruments. As During Low Pressure Both Working OK ,But During High Pressure, transmitter with Lower sensor range Goes to Fault mode as Beyond its Sensor Limit it can Measure, So may I provide Saturation point Some where to Suppress This Fault during High Pressure.
what is thermo coupler and how it works
Why we are using DPT(Differential Pressure Transmitter) in separator instead of level trasmitter?
What are the different types of thermistors used in industries? How to the operation of typical thermistor?
How to calibration coriolis flow meter?
how to check earthing,what is minum ohms for proper earthing
installation process of orifice,a question asked for confusion creation in interview by BARC 1.if orifice is tightly fitted with pipe ,it will act like venturi 2.if orifice is left hanging in between liquid it will not create the pressure difference exactly,
