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Once the scaling adjustment has been made, change to the low-value parameter end of the
range and make the offset adjustment (for an NTC resistance sensor, this is a high-temperature
point). Again, this should be a small adjustment. As these adjustments are not independent, re-
check the high-value parameter point after the offset has been adjusted. A few iterations of
these adjustments may be required to achieve the desired accuracy.
4.10.2 Adjusting a generic calibration file
You need a method of maintaining the temperature sensor at two known temperatures (T1 and
T2) to perform this calibration. This procedure calibrates the sensor for temperatures between
these two known values by applying scale and offset corrections. The calculated correction
parameters will be applied to every reading of this sensor but will not be applied to any other
sensor in the system, even sensors of the same type using the same generic calibration curve.
For this procedure, T1 produces a lower sensor-resistance than T2:
• For a PTC sensor, T1<T2
• For an NTC sensor, T1>T2
1 Tap a configured widget on the home page. The Sensor Details page is displayed.
2 Tap Calibration and from the drop-down list select the generic file corresponding to the
sensor. This example selects RP51.dat for a PT100.
3 Tap Cal Adj to open the Generic Sensor Adjustment page.
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