WHY WE NOT USE 2-20mA,1-20mA,3-20mA or 10-50mA SIGNAL?
INSTEAD OF 4-20mA.
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Answer Posted / ravi vaya
Because 4 mA is called live zero of transmeter
If we set 0 mA at 0 pressure ya any ,we can`t deside inst.
is working ok .
And also mA is be a linear from 4 mA
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