WIKA R74.100 Mode D'emploi page 7

1. Safety
Marking Designation
2 Symbol of the
equipment category
G Ex atmosphere
D Ex atmosphere
Ex Ex marking
h Ignition protection type Non-electrical equipment for explosive
IIC Suitable atmosphere
IIIC Suitable atmosphere
T6 ... T1 Maximum surface
temperature
T85 °C ... Maximum surface
T450 °C temperature
Gb Equipment Protection
Level (EPL)
Db
X Specific conditions
of use see operating
instructions
WIKA additional information models 73, 74 (ATEX)
Meaning
High safety, approved for zone 1 and 21
Concerning explosive atmospheres caused
by gases, vapours or mists
Concerning explosive atmospheres caused
by dust
Standards ISO 80079-36 and ISO 80079-37
applied
atmospheres
An ignition protection type is not applied to
the letter "h".
Gas atmosphere group IIC
Combustible flyings, non-conductive dust
and conductive dust
Symbol indicating the temperature class
The actual maximum surface temperature
depends not on the equipment itself, but
mainly on the operating conditions.
Maximum surface temperature
The actual maximum surface temperature
depends not on the equipment itself, but
mainly on the operating conditions.
Potential ignition sources that are effective
or may become effective during normal
operation and expected malfunction
Ambient temperature with special range
Specific conditions of use apply.
Before mounting and commissioning the instrument,
ensure you read the operating instructions!
EN
7