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Answer Posted / alfred t jose
4-20ma is the standard value,because any small changes
occurs we can simply identify when we use 4-20ma. if any
zero error occur we can identify it by using 4-20ma.
according to pneumatic 3-15psi is used.same reson for that.
when 4ma applied corresponding 3psi optain and 20ma is
applied then we get 15psi.
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