WIKA 55 - Page 7

EN
11583747.07 12/2021 EN/DE/FR/ES
WIKA additional operating instructions model 55 (ATEX) 7
Ex marking
II 2G Ex h IIC T6 ... T1 Gb X
II 2D Ex h IIIC T85 °C ... T450 °C Db X
Marking Designation Meaning
CE marking European conformity
Specic marking for
explosion protection
Ex symbol
II Symbol of the
equipment group
Equipment intended for use in other
places than underground parts of mines,
and in those parts of surface installations
of such mines, liable to be endangered by
redamp and/or combustible dust and an
explosive atmosphere.
2 Symbol of the
equipment category
High safety, approved for zone 1 and 21
G Ex atmosphere Concerning explosive atmospheres
caused by gases, vapours or mists
D Ex atmosphere Concerning explosive atmospheres
caused by dust
Ex Ex marking Standards ISO 80079-36 and
ISO 80079-37 applied
h Ignition protection
type
Non-electrical equipment for explosive
atmospheres
An ignition protection type is not applied
to the letter “h”.
IIC Suitable atmosphere Gas atmosphere group IIC
IIIC Suitable atmosphere Combustible yings, non-conductive dust
and conductive dust
T6 ... T1 Maximum surface
temperature
Symbol indicating the temperature class
The actual maximum surface temperature
depends not on the equipment itself, but
mainly on the operating conditions.
1. Safety