Answer / amit kr jain

We use 4-20 mA range as a standard bcoz we know very well
when there is no input i.e. output must be 4 mA otherwise
instrument is giving wrong output(i.e. instrument not
having proper calibration).
-Amit

Answer / elayaraja

We use 4-20 mA range as a standard bcoz we know very well
when there is no input i.e. output must be 4 mA otherwise
instrument is giving wrong output

Answer / r natarajan

4-20 mA signals are possible to divide equally, 0-4 mA as
close loop checking.

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