why 4 to 20 ma ,why not 0 to 20 or 3 to 15 or anything
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Answer Posted / subash
from field to control room we use lengthy cables.due to the
resistance of the cable may voltage drop occur.hence we
always choose 4-20 ma over a 0 to 10v....if we select 0-20
ma then we can'n distingush between faut condition and
minimum scale....hence we choose 4-20 ma....
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