why we are called the 4-20ma transducer,not 0-20 ma
transducer??
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Answer Posted / raja
There is a long tradition dating from the early pneumatic
instruments for a control range from 25% to 100%. If you
want to know why, look at the pressure vs travel curve for a
flapper-nozzle. The early electronic instruments used the
same force-balance approach (many with a 10-50 mA range -
easier to get a higher force with the higher current) which
was eventually translated over into the pure electronic format.
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