7 atex – JUMO 14597 safetyM STB/STW Ex - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual User Manual

Page 83

7 ATEX

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

Highest admissable temperature at the probe tip

= 130 °C – 0.9 °C

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

439.1 °C

432.5 °C

349.1 °C

342.5 °C

289.1 °C

282.5 °C

229.1 °C

222.5 °C

194.1 °C

187.5 °C

154.1 °C

147.5 °C

129.1 °C

122.5 °C

102.1 °C

95.5 °C

94.1 °C

87.5 °C

74.1 °C

67.5 °C

79.1 °C

72.5 °C

62.1 °C

55.5 °C