Answer Posted / abdulbasit137@hotmail.com

this is the one of the best formula for this situation
measuring value (1) - low ranmeasge value (1)/span
=
measuring value (2) - low range value (2)/span
u know span high value - low value 4 to 20 span is =16
3 to 15 span is = 12
simple
mv1 - lrv1 = mv2 - lrv2
span span
4.6-4/16= ?-3/12 = 4.3psi ans

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