Answer / b. nani babu

At 0 mamp we can't identify the transmitter is working or not properly. So we are using 4-20 mamp signal used in transmitters.

Answer / siddhesh

4-20 signal is Intrinsically safe vale of current. also it dose not get affected with EMI. 

Answer / deepakrajasekaran.r

From 4ma to 20ma only we could got linear output before 4ma we will received non linear output

Answer / hossam nasr

From 4to20 ma is linear curve and it's suitable to calculate all values from zero to span

Answer / amar.sm

NO LOSSES IN 4-20 milli amps or no drop

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