PGC, Inc. Appendix B; SmartPad version 0.503 Steady State & Programmable
November 2005 B-18
After the auxiliary RTD zero adjustment it is necessary to adjust the span or scaling factor for
the input. This adjustment will determine the slope of the calibration curve. This value should
be as close as practical to the maximum operating temperature.
ACTUAL VALUE: will indicate the current water temperature, as it is measured by the input
circuit. This value will change to indicate the calibration offset, after the CAL key is pressed.
REF. VALUE will indicate the reference value entered in the water RTD calibration screen
AUX RTD SPAN CALIB
ACTUAL VALUE 3.9°C
REF. ACTUAL 04.0°C
CAL DONE
Key for function keys action
F1 = CAL: instructs the A/D converter to
accept the new span value.
F2 = no function
F3 = no function
F4 = DONE: allows the user to exit the
screen after the offset value has been
accepted. Returns to the auxillary
RTD calibration screen
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