Каталог Weidmuller: Electronics - Analogue Signal Conditioning

EX basics
Technical appendix/Glossary
IEC (group II)
Classification
T1
T2
T3
T4
T5
T6
Tx
Max. surface
temperature
450 ºC (842 ºF)
300 ºC (572 ºF)
200 ºC (392 ºF)
135 ºC (275 ºF)
100 ºC (212 ºF)
85 ºC (185 ºF)
Max. surface temperature
undefined
Comment
The temperature is relevant to all parts
of the devices that can come into contact
with potentially explosive materials.
Valid for the closed tank systems used
on container ships where the individual
contents cannot be monitored in event
of a fire. 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
Certification
authority
ex. DEMKO
European
Commission
mark for Ex
devices
Device group
"Surface"
Device category
zone 1
Gas
Protection
explosion type:
intrinsically safe
category
Gas group
Surface temperature:
max
135 °C
W
W.15