Answer Posted / vivek jain

why not 0 to 3 mA becoz the output is nonlinear.(also live
zero(if it is a process variable)and dead zero(if there is
wire break))
4-20mA the output is linear.
also 20 is a multiple of 4 i.e why 20mA!
IF THE OUTPUT GOES ABOVE 20 mA THEN THERE IS UPPER LIMIT
VIOLATION I.E THE OUTPUT WILL REMAIN CONSTANT AT 20.5mA.

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