why we used for range in pnumatic 3-15 psi and current 4-20
ma?
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Answer Posted / saravanamurthy
Justification Steps:
1. Interpolate the coordinates of % opening and Current in Y-axis and X-axis Respectively
2.Connect the coordinates , you will get a straight line
3.Since it is with slope , it's our responsiblity to calculate the slope so that we can project it in normal plane
Slope Calculation:
a.Equation of straight line : Y=mX+C
where,
Y- Current in mA
X-%opening of full scale
m-Slope of the straight line
C- constant (calculated from Y intercept )
b.Calculate Slope using the formula:
m=(X2 - X1)/(Y2 - Y1 )
4.In this range of current , the value of slope is found to be constant , ie.m=0.16, but when we go for some other ranges slope changes as it ascends so its non linear for other ranges.
5.finally straight line equation for the above range is Y=0.16*X+4
6.This constant slope means that the line is linear
Regards,
S.I.Saravanamurthy
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