ATEX
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GA03107_002_A4 - 09/2015 - © Oerlikon Leybold Vacuum
If only the inside of the pump (process side) has been certified for use in
explosive atmospheres, then the pump itself must not be installed and
operated within explosion hazard areas.
Outside of the pump: Zone definitions
Areas in which explosive atmospheres (gases, vapors or mists) in the air can
occur are classified in three zones according to the frequency and the dura-
tion of the occurrence of an explosive atmosphere. These zones are desig-
nated as Zone 0, 1 and 2.
The definitions for these zones are described in the Annex I of the «Atex
Directives (Directive 99/92/EG) for the improvement of health protection and
safety of staff which might be endangered by explosive atmospheres».
Notes relating to the definitions for the three zones relating to areas with
explosive atmospheres are given in the Directive 99/92/EG and the corre-
sponding guide (COM (2003) 515), together with the European standard EN
60079-10 (Electrical apparatus for explosive gas atmospheres. - Part 10
Classification of hazardous areas). Additionally further information on the
avoid ance of explosions and on the topic of explosion protection can be
found in the Directive 99/92/EG and the corresponding guide.
This information can be downloaded from the EU Internet site.
Ignition Temperatures of Gases/Vapors
The pumps are suited only for applications in which potentially explosive gas
or vapor mixtures have an ignition temperature of over 200 °C (T3) or 135 °C
for T4.
The ignition temperatures of gases or vapors, sometimes also termed auto-
ignition temperature can be taken from the material safety data sheets.
The pump is not suited for operation in potentially explosive gas mixtures in
which the oxygen concentration is over 21% or if reactive, aggressive or cor-
rosive gases are present.
CAUTION
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