any body tell me why 4-20 ma use as a current any reason for this amount why n

any body tell me why 4-20 ma use as a current any reason
for this amount why not 3-25 ma?

Question Posted / nstailor810

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any body tell me why 4-20 ma use as a current any reason for this amount why not 3-25 ma? ..

Answer / kiran

Normally all field instruments have 250 ohm resistance,
& operated this instruments on 1-5 volt.
Sothat @ 4mA the volt = 1 volt &
@ 20mA volt = 5V.

Hence it expressed in 4-20mA.

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