Atex Specification; Gas Group; Atex Category; Temperature Class - VERDER VERDERFLEX Dura D7 Instruction Manual

4 ATEX Specification
1. The ATEX code consists of the group, category, ignition
protection marking and temperature class.
2. ATEX rating of Verderflex Dura pumps is to the following
standard which is explained below:
EX h IIB T4 Gb / Db for T ambient -5°C to 40°C
Item Example
Ignition Pro-
h
tection

Gas Group

IIB
Temperature
T4
Class
ATEX
Gb/Db
Category
Ambient
for T ambient
Temperature
-5°C to 40°C
Range *
Table 4 ATEX Classification
*The ambient temperature range depends on the pump type.
(g refer to 3.1 ATEX Name Plate)
4.1 Gas Group
Gases are classified according to type of hazardous
environment and ignitability of the gas/air mixture as
defined in EN/IEC 60079-21-1.
I
II
Gas Group
III
A
Gas Sub
B
Group
C
Table 5 Gas Group Classification
ATEX Instruction Manual
Dura 05-55
Explanation
Non-Electrical Equipment
meeting the requirements of
EN ISO 80079-36:2016 is
marked with "h".
Gas Group II - Ethylene
Maximum surface tempera-
ture < 135 °C
Equipment Protection level:
Gb: Gas zone 1
Db: Dust zone 21
Maximum ambient tempera-
ture for operating the pump
-5°C to 40°C
Mines
Surface above ground with
gas hazard
Surface above ground with
dust hazard
Less easily ignited gases
e.g. propane
Easily ignited gases e.g
ethylene
Most easily ignited e.g.
hydrogen or acetylene
Version 1.0v-07/2019

4.2 ATEX Category

Zones are decided by the site based on a risk assessment
of the likelihood of a potentially explosive atmosphere be-
ing present.
Gas Zone
Zone 0 Ga
Zone 1 Gb
Zone 2 Gc
Table 6 ATEX Category - Gas Zone
Dust Zone
Zone 20 Da
Zone 21 Db
Zone 22 Dc
Table 7 ATEX Category - Dust Zone

4.3 Temperature Class

The Temperature Class rating of T1, T2, T3, T4, T5 or T6
for gases, indicates the classification for the maximum sur-
face temperature for the device and therefore the the dis-
tance to the potential ignition temperature for a particular
gas.
T Class Maximum Surface Temperature
T1
T2
T3
T4
T5
T6
Table 8 Temperature Classification
ATEX Category
Explosive atmosphere pre-
sent continuously or for long
periods, frequently
Explosive atmosphere is
likely to occur under normal
conditions, occasionally
Explosive atmosphere is
unlikely to occur under nor-
mal conditions, short periods
ATEX Category
Explosive atmosphere pre-
sent continuously or for long
periods, frequently
Explosive atmosphere is
likely to occur under normal
conditions, occasionally
Explosive atmosphere is un-
likely to occur under normal
conditions, short periods
450°C
300°C
200°C
135°C
100°C
85°C
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