2.2 Functions in the channel menu
Temperature module TED8xxx / page 37
2.2.7 Calibration of the Pt-1000 sensor (Kryo option)
The Pt-1000 sensor itself is factory calibrated and does not need any further
calibration. The calculation of the temperature by means of the sensor-resistance is
done according to DIN IEC 751. At very low temperatures however (below 200K),
there are small differences between the DIN IEC 751 model and the real sensor
resistance / temperature.
The following graphics shows the corrections which have to be applied by the
customer to the displayed temperature values to obtain physically correct
temperatures.
Temperature difference
-1,5
-1
-0,5
0
0,5
1
1,5
0
100
200
300
Temperature in Kelvin
Deviation (K)
Figure 12
PT1000 temperature correction at low temperatures
Deviation = T
sensor
- T
Display
Example: Desired temperature 100K, Figure 12 gives a deviation of +1.4K =>
T
SET
= T
display
= T
sensor
– Deviation = 98.6K
