DT1310 xx xx
28
20220128-V0
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:
Summary of Contents for DT1310 Series
Page 1: ...DT1310 xx xx Intrinsically Safe Temperature Resistance Transmitter Operating Instructions...
Page 41: ...DT1310 xx xx 20220128 V0 41 10 2 Application example...
Page 42: ...DT1310 xx xx 42 20220128 V0 10 3 ATEX Tan s tv ny...
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