Temperature compensation correction curve
Valmet MCA compensates for the effect of temperature
on the measurement based on Pt-100 sensor measure-
ment results. If, however, temperature dependency still
exists in the measurement result, it can be eliminated
by using the temperature compensation correction
function. The temperature dependency must first be
determined via laboratory monitoring. To ensure that
the temperature dependency is accurately defined, the
temperature area must be sufficiently broad.
The results of the laboratory monitoring are shown
on an MCA Laboratory vs. Temperature graph. MCA -
Lab graph points that are horizontal indicate that there
is no temperature dependency in the measurement
results. If the graph points are in a horizontal position
at a level other than zero, you must perform offset
correction on the calibration as explained in chapter
7.3.
MCA - Lab graph points that are in a position other
than the horizontal indicate that there is temperature
dependency in the measurement (figure 1). Temperat-
ure dependency is eliminated by entering into MCA the
temperature compensation correction curve. To go to
the Temperature Compensation menu, Select Special
Functions/Temperature Comp. The following display
appears:
Press the Edit button. Then enter the correction
curve as pairs of points. Valmet MCA then performs
the correction based on lines drawn through these
points. You can enter up to six pairs of points. In the
example in Figure 1, two pairs of points are sufficient.
The pairs of points can be selected based on the results
as in the following example:
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