Brochure/Catalogue

IEC (group II)
Classication
Max. surface
temperature
Comment
T1 450 °C (842 °F)
The temperature is relevant to all parts
of the devices that can come into contact with
potentially explosive materials.
T2 300 °C (572 °F)
T3 200 °C (392 °F)
T4 135 °C (275 °F)
T5 100 °C (212 °F)
T6 85 °C (185 °F)
Tx
Max. surface temperature
undened
Valid for the closed tank systems used
on container ships where the individual
contents cannot be monitored in event
of a re. It is the responsibility of the
operator to assess each temperature
class.
What labelling is considered proper?
An example of device labelling:
CE 0539
T
II 2 G Ex ia IIA T4
Certication
authority
ex. DEMKO
European
Commission
mark for Ex
devices
Device group
“Surface“
Device
category
zone 1
Gas
Protection
explosion type:
intrinsically safe
category <ia>
Gas group Surface
temperature:
max 135 °C
EX basics
W
Technical appendix/Glossary
W.172729490000