Datcon DT1310 Series, Руководство по эксплуатации, Страница: 28 / 52

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7.10. Pt correction values
Function The real Pt characteristics may differ from the theoretical
R-°C curve. The difference will cause a measurement error
on temperature measurement. When you are capable to
calibrate the Pt sensor on minimum 3 points you will know
the resistance difference of the theoretical and real
characteristics. Using this resistance values, the instrument
will correct the measurement error on this points exactly by
adding the correction values and - using interpolation
method - on all other points of the whole characteristics.
For the best curve fitting it is recommended to choose the
correction points at about 20%; 50%; 80% of the
measurement range.
Note: The accuracy of this correction method depends on
the accuracy of the calibrating device.
Sequence of operations Example:
The measurement range is 50-150 °C.
Calibrate the Pt100 sensor on the following temperatures:
70 °C; 100 °C; 130 °C.
1. Make a table according this:
Temperature
(°C) R n ominal
(ohm)
R m easured
(ohm)
Rn - Rm
(ohm)
70 127.08 126.76 0.32
100 138.51 138.49 0.02
130 149.83 149.91 -0.08
Use the bold resistance values for correction according the
following figures: