Siemens SITRANS F Series Operating Instructions Manual page 20

Safety notes
2.4 Use in hazardous areas
Additionally, the maximum surface temperature of the overall device shall be:
● If Tprocess ≤ 85°C, maximum surface temperature = 85°C.
● If Tprocess > 85°C, maximum surface temperature = process temperature.
For installation in environment with max 500 mm dust, the maximum process temperature shall
be as follows:
Additionally, the maximum surface temperature of the overall device shall be:
● If Tprocess ≤ 85°C, maximum surface temperature = 85°C.
● If Tprocess > 85°C, maximum surface temperature = Tprocess.
20
Ta (°C)
35
30
Ta (°C)
60
55
50
45
40
35
30
Maximum Process Temperature per Temperature
Class (°C)
200
200
Maximum Process Temperature per Temperature
Class (°C)
-40
-10
20
50
80
110
140
Operating Instructions, 06/2018, A5E44036384-AA
FC310 (From firmware 4.0)