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If you are talking about 4 mA = 0% and 20 mA = 100% then the formula would be a linear equation:
y=mx + b
y=6.25(x) - 25
y= percentage
x=mA ouput
So for example put 4 mA in place of x and you get 0% for y and if you use 20 mA in place of x you get 100% for y.
You can rewrite the equation if only Percent input is known to find mA output it would be
X= (Y + 25)/6.25 this way you input the percent in for (Y) and you have the mA output for X
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