19
Symbol
Designation
Meaning
CE marking
Manufacturer's confirmation that the product complies with the product-specific
European directives in force
Ex-symbol
Explosion protection markings for equipment and protective systems intended
for use in explosive atmospheres, in accordance with Directive 2014/34/EU
II
Equipment group
Equipment group "II" /Equipment for use in explosive atmospheres outside the
mining industry above ground
2
3
Category
For use in zone 1 (gas) and zone 21 (dust)
For use in zone 2 (gas) and zone 22 (dust)
G
D
Explosive atmosphere
Atmosphere gas "G"/Ex-atmosphere of gas/air
Atmosphere gas "D"/Ex-atmosphere of dust/air
Ex
Standard
Explosion protection standard DIN EN ISO 80079-36; -37
h
c
k
(b1)
Ignition protection type
Non-electrical devices that meet the requirements of the DIN EN ISO 80079-37
standard must be marked with "h" in accordance with ISO 80079-36 in addition
to those of ISO 80079-36, i.e., with regard to the degree of protection applied
without additional marking.
"c" protection class "Constructional safety"
"k" protection class "Liquid encapsulation"
"(b1)" Control of ignition sources
IIA
IIB
IIC
Gas explosion group
Group II equipment is classified according to the type of explosive gas
atmosphere for which it is intended.
IIA, a typical gas is propane;
IIB, a typical gas is ethylene;
IIC, a typical gas is hydrogen.
IIIA
IIIB
IIIC
Dust explosion group
Group II equipment is classified according to the type of explosive dust
atmosphere for which it is intended.
IIIA: suitable for flammable suspended solids;
IIIB: suitable for flammable suspended solids and non-conductive dust;
IIIC: suitable for flammable suspended particles and non-conductive dust and
conductive dust.
T1
– T6
Temperature class
Temperature class
Maximum permissible surface temperature
T1
T2
T3
T4
T5
T6
450 °C
300 °C
200 °C
135 °C
100 °C
85 °C
T 135 °C
Temperature limit value
In the case of an explosive dust atmosphere, the maximum permissible surface
temperature is specified as "D" as the temperature limit value in "°C".
TX
Temperature
class/Temperature limit
value
The maximum surface temperature mainly depends on the operating
conditions and not on the pump, i.e. on the pumping media temperature.
Ga / Da
Gb / Db
Gc / Dc
Equipment protection
level
Equipment protection level (
EPL= Equipment Protection Level
) according to
DIN EN ISO 80079-36
X
Additional marking: Important conditions for safe use must be observed and adhered to (see order-related
documents in addition to the additional operator's manual).
Table 9: Designation legend according to Directives 2014/34/EU and DIN EN ISO 80079-36
