why using 4-20ma not using 0-20or why not using 1-
20ma???????
Answer Posted / srinivasan narayanan
Most of the Transmitters output used 4 -20mA. This is because to identify whether the transmitters are live or not
if the Transmitter shows 4 mA it's a live Zero
if the Transmitter Shows 0 mA it's a Dead Zero
Is This Answer Correct ? | 6 Yes | 1 No |
Post New Answer View All Answers
plz tell me clearly about PID.."when v have to change I value,D value,GAIN??
I want to measure and control level in tank of size 10*5 filled with gasoline, so plz give me the solution with clear details. how to select transmitter and sensors.
Define the difference between a stable versus an unstable controlled system and some of the tools you might use to be able to detect when this is happening and assumptions used for control system application design that could contribute to instability
Decibel.
Why the ammonia and Nitric Acid level indicators is with millimeter ? and What is the conversion form millimeters that level indicator indicate to weight ?
What materials are used in thermo wells?
Working principle of magnetic flow meter ......and calibration procedure of e+h magnetic flowmeter...
What is loop1 and loop2 in MTS LT?
What is the calibration procedure of Drum level transmitter if range is 0 to -400 mmh2o in lab?
How works weighfeeders in cement industry? what is the working principle?
what is exact time to study dcs and plc cources
what is the input to be given in digital flow meter during the the calibration time?
why we use the ac supply load cell>?can we use the dc supply load cell?advantages and disadvantage of the ac supply load cell?
which type inter lock use in petrochemical refinery,and oil & gas?
what is the imbustion control loop