Adaptive® JUNIOR – Technical and HMI User Guide
REV 1.04
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4.8.3.
Optional Calibration
The firmware provides an optional calibration facility which can be used to either improve the accuracy of the
temperature sensors being used or adjust for thermal offsets present in the system. For example, a thermistor will
be specified over a given temperature range for a specified accuracy, but this may be much larger than the required
operating range. By calibrating it over a smaller range the accuracy can be increased. The calibration can also be
used to minimise errors when a temperature offset exists such as when the temperature sensor is not located close
to the energy source.
The gain and offset values are used to apply a straight-line adjustment to the temperature measurement. The values
are typically calculated by taking two measurements of both the indicated temperature on the controller and that
from a separate calibrated temperature indicator at the two extremes of the range being used. These four values are
then used to calculate the gain and offset to apply, minimising the error across the range.
Each sensor has a set of Gain and Offset parameters that can be entered in the boxes shown in Figure 23 above.
