why we used for range in pnumatic 3-15 psi and current 4-20
ma?
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Answer Posted / pankaj kumar
because in b/n 3 to 15 psi the responce of actuator & control
valve is linear.before this hunting problem occurs.
we use 4 to 20 ma signal as standard signal because during
confurigation of hart 250ohm resistance or connected that is
easly converted in to voltage signal.(1v to 5v )......
instead of voltage signal current signal use because voltage
is pickup noise more as compare to current.
and in case of voltage signal chance of voltage
droff...............
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