Control systems and automation

A 5 to 20 bar reverse acting proportional pressure controller has an output

of 4 to 20 mA. The set point is 11 bar. Determine:

(a) the measured value pressure which gives an output of 15 mA when

the proportional band setting of the controller is 40%

(b) the proportional band setting which will give an output of 8 mA when

the measured value is 14 bar and the desired value is 11 bar.