User Manual

Section 1 – Main safety-relevant characteristics
10/2001
BM 100 A ATEX
7
1.4 Allowable temperatures
1.4.1 Process temperature
For applications requiring Category
1/2 G
or
1/2 D
equipment, the following process
temperatures are allowed as a function of the Temperature Class:
Temperature Class Process temperature
T6 -20…+85°C
T5 -20…+100°C
T4 -20…+135°C
T3 -20…+150°C
-20…+200°C at flange temperatures
≤
150°C
and probes with distance piece
For applications requiring Category
2 G
or
2 D
equipment, the following process temperatures
are allowed as a function of the Temperature Class:
Temperature Class Process temperature
T6 -50…+85°C
T5 -50…+100°C
T4 -50…+135°C
T3 -50…+150°C
-50…+200°C at flange temperatures
≤
150°C
and probes with distance piece
1.4.2 Ambient temperature
The minimum and maximum ambient temperatures (-20…+50°C) for the electronic equipment
are independent of Temperature Class and Category.
1.4.3 Surface temperature
For applications requiring Category
1/2 D
or
2 D
equipment,
- with a dust layer of
≤
5 mm,
- an ambient temperature of
≤
50°C, and
- a flange temperature of
≤
150°C,
the maximum surface temperature at any point of the measuring device shall be equal to the
process temperature, but at least 75°C.