To Calculate:
Object distance (D) from inner window edge using 4-20mA analog, indirect type sensor.

Given:
IOUT = output in milli-Amps WW = window width in inches

Formula:
((IOUT-4) x WW) / 16 = D inches

Example:
IOUT = 15mA WW = 4.625 inches

Calculation:
((15-4) x 4.625) / 16 = 3.18 inches from the inside window edge