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why 4 to 20 ma ,why not 0 to 20 or 3 to 15 or anything
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Answer Posted / rabindra ojha
main purpose is for live zero.in system voltage is 1 to 5
volt. used resistance is 250 ohm. at 1 volt and 250 ohm
resistance current is 4ma.like that when 5volt and 250ohm
resistance current is 20ma.so 4 to 20ma.
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