why we used for range in pnumatic 3-15 psi and current 4-20 ma?

why we used for range in pnumatic 3-15 psi and current 4-20
ma?

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why we used for range in pnumatic 3-15 psi and current 4-20 ma?..

Answer / rajeev

4-20ma is bcoz in older transmiter ckt 3ma is use for it self to ckt operation & 20ma is for saftey purpose bcoz 30ma is dangerous for life.

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