ATEX
11
GA03107_002_A4 - 09/2015 - © Oerlikon Leybold Vacuum
Explanation of the Symbols
II
Equipment Group II applies to all equipment for use in areas which can be
endangered by an explosive atmosphere except in underground mining oper-
ations and their related above ground systems which can be endangered by
mine gas and/or combustible dust.
Inside/outside
Specifies the category/conditions according to which the
inside (i)
(i.e. sec-
tions of the equipment in contact with the process gas flow) and the
outside
(o)
of the equipment are classified provided these differ.
3
Category 3 comprises equipment which is designed such that it can be oper-
ated in agreement with the characteristic quantities (operating parameters)
specified by the manufacturer and which ensure a normal level of protection.
Equipment belonging to this category is intended for use in areas where it
needs not to be expected that an explosive atmosphere occurs due to
gases, vapors, mists or raised dust but, in case such an atmosphere should
occur in spite of this then according to all probability only rarely and briefly.
Equipment belonging to this category ensures during normal operation the
required degree of safety.
G
For areas with an explosive atmosphere caused by gases, vapors or mists in
the air.
The pump is not suited for areas with an explosive atmosphere caused by
explosive dusts.
II, IIA, IIB or IIC
Explosion Groups: these are subdivisions for equipment belonging to Group II
which is employed in connection with some protection types. This subdivision
is based on the concept of the maximum permitted gap and the minimum
ignition current of the explosive mixture. Refer to Annex A of the European
Standard EN 50014. (EN 50014 electrical apparatus for potentially explosive
atmospheres — General requirements).
Equipment marked with IIB is suited for applications which require equipment
with the marking IIA. Correspondingly equipment marked with IIC is suited for
applications which require equipment belonging to Explosion Group IIA or IIB.
Equipment which is suited for all types of application can be marked by II or
not marked at all.
Summary of Contents for RUVAC WA
Page 67: ...Notes 67 GA03107_002_A4 09 2015 Oerlikon Leybold Vacuum ...
Page 68: ...68 GA03107_002_A4 09 2015 Oerlikon Leybold Vacuum EC Declaration of Conformity ...
Page 69: ...69 GA03107_002_A4 09 2015 Oerlikon Leybold Vacuum EC Incorporation Declaration ...
Page 71: ...Index 71 GA03107_002_A4 09 2015 Oerlikon Leybold Vacuum ...