ABB i-bus KNX Product Manual page 17

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ABB i-bus KNX
Device technology
PT100
The PT100 is precise and exchangeable but subject to faults in the cables (cable resistance and heating of
the cables). A terminal resistance of just 200 milliohms causes a temperature error of 0.5 °C.
PT1000
The PT1000 responds just like the PT100, but the influences of cable errors are lower by a factor of 10.
Use of this sensor is preferred.
KT/KTY
The KT/KTY has a low level of accuracy, can only be exchanged under certain circumstances and can
only be used for very simple applications.
Please note that there are different tolerance classes for the sensors in the versions PT100 and PT1000.
The table indicates the individual classes according to IEC 60 751 (date: 2008):
Description
Class AA
Class A
Class B
Class C
t = Current temperature
Example for class B:
At 100 °C, the deviations of the measurement value are reliable up to
Tolerance
0.10 °C + (0.0017 x t)
0.15 °C + (0.002 x t)
0.30 °C + (0.005 x t)
0.60 °C + (0.01 x t)
0.8 °C
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