PGC, Inc
500-1000 CFM Air Handler
May 2006
Appendix A
A-23
Water RTD Calibration Procedure with Precision Resistors:
1.)
Zero Offset, or Single Point Offset.
a.
Place the low temperature precision resistor in the RTD circuit.
b.
Access the RTD calibration screens in the SmartPad™:
•
On the Process Variables screen, press MORE (F4), then PREF (F2), and
enter the access code(factory setting: 0000) to access the Area modification
screen.
•
Press CAL (F3) to access the Water Calibration screen.
b.
Enter the temperature measured by the reference standard and press ZERO (F1).
c.
Press “CAL” (F1); after a few seconds, observe the Actual Value matches the
Reference Value.
c.
Press “DONE”.
2.)
Span (Gain) Adjustment:
a.
Place the high temperature precision resistor in the RTD circuit.
b.
Access the RTD calibration screens in the SmartPad™:
•
On the Process Variables screen, press MORE (F4), then PREF (F2), and
enter the access code(factory setting: 0000) to access the Area modification
screen.
•
Press CAL (F3) to access the Water Calibration screen.
c.
Enter the temperature represented by the precision resistor and press SPAN (F2)
d.
Press “CAL” (F1); after a few seconds, observe the Actual Value matches the
Reference Value.
e.
Press “DONE”.
Summary of Contents for 9354-4250
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Page 42: ...PGC Inc Appendix B SmartPad version 0 503 Steady State Programmable November 2005 B 1 ...
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