Why Are Using 4ma To 20ma For Signal Transfer. Why Not 0 To 20ma?

1.	Why Are Using 4ma To 20ma For Signal Transfer. Why Not 0 To 20ma?
Answer» Because we cannot DETECT OPEN LOOP if 0-20 is USED. Because we cannot detect open loop if 0-20 is used.

Answer»

Because we cannot DETECT OPEN LOOP if 0-20 is USED.

Because we cannot detect open loop if 0-20 is used.

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