Operating Manual Owner manual

7 ATEX
77
2013-04-01
Example:
A thermocouple is to be used in temperature class T4 (maximum temperature 135 °C, limit is to be reduced 5 K for safety);
T
s
Highest admissable temperature at the probe tip
T
s
= 130 °C – 0.9 °C
T
s
= 129.1 °C
The maximum temperature (measured or medium temperature) at the probe tip must therefore not exceed a value of 129.1 °C.
The following table presents a summary of the calculations for all temperature classes:
Table 18:
Media and ambient temperature for applications re-
quiring devices of category 2
Media and ambient temperature for applications re-
quiring devices of category 1
Sensor with PT100 Sensor with thermocouple Sensor with PT100 Sensor with thermocouple
T1 439.1 °C 432.5 °C 349.1 °C 342.5 °C
T2 289.1 °C 282.5 °C 229.1 °C 222.5 °C
T3 194.1 °C 187.5 °C 154.1 °C 147.5 °C
T4 129.1 °C 122.5 °C 102.1 °C 95.5 °C
T5 94.1°C 87.5°C 74.1°C 67.5°C
T6 79.1°C 72.5°C 62.1°C 55.5°C