APG IRU-9400 user manual - Manual (Page 26)

IRU Series
Rev. B1 3/10
26
Automation Products Group, Inc.
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• Analog Scaling
To scale the analog output, simply enter the desired distance, beginning at the
sensor face, to each of the two end points of the analog signal using the 4 mA/0
V Set Point and 20 mA/2.5/5 V Set Point parameters. The analog output will be
scaled between the two distance values entered in these settings. The output can
be scaled in either direction; signal rising or falling as the distance increases (see
diagram below). If the detected target is outside the scaled range, the sensor will
output either full scale or minimum scale depending on which end of the analog
scale the target resides.
• Analog Calibration
(No adjustments required in most applications)
Calibration of the analog signal is accomplished using the 4 mA Calibration
and 20 mA Calibration or the 2.5/5 Volt Calibration parameters. To calibrate
the output, the sensor must be outputting the analog endpoint value that you
wish to calibrate (i.e, full scale or minimum scale). Increasing or decreasing the
value in the calibration parameter will increase or decrease the corresponding
output signal value. For example, decreasing the 20 mA Calibration value will
decrease the 20 mA signal output value. These parameters are factory set and
normally should not require adjustment. The default values (shown below) will
bring the output to within a few mirco-amps or micro-volts of an exact analog
signal value.
4 mA Calibrate = 8200
20 mA Calibrate = 41000
2.5 Volt or 5 Volt Calibrate = 4095
4 mA
20 mA 20 mA
4 mA
Increasing Distance
0 V
2.5/5 V 2.5/5 V
0 V