Homa CHRS.../4 series, Original Instruction Manual, Page: 42 / 76

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8.1. General information
Application validity
The validity of these operating instructions apply exclu-
sively to HOMA explosion protected submersible
motor pumps. The general operating instructions are to be
observed together with these operating instructions.
Area of application
The information in these additional operating instruc-
tions apply only for HOMA equipment that are used in
potentially explosive zones.
Caution! Non-adherence to the instructions can lead
to explosions!
8.2. Intended use according to RL94/9/EG
Definition of terminology
Explosion-protected submersible motor pumps are prima-
rily intended for waste waters with slimes, solids, fibers,
feces as well as soiled waters of all types. The atmo-
spheres of the areas where the units are used may be
explosive due to the local operational circumstances.
Conditions for use
Caution! The intended use of the explosion-protec-
ted submersible motor pumps always assumes a co-
ver of fluids of the pump hydraulics in order to ensure
a primary explosion protection of the mechanical
part in normal operation!
Caution! The machines must never be run in idle. This
must be ensured by a level control as described in
4.3.
Caution! The machines must only be operated in the
power range between the input power P1max and
P1min in order to effectively prevent a critical tempe-
rature at the outside motor surface. For data of the
power limits see Appendix Table 1, electrical data or
the information in the respective type examination
certificate. Due to its model testing design, the elec-
trical part (submersible motor) may be used in poten-
tially explosive regions of the zones 1 and 2. HOMA
ex-protected submersible motors model AM satisfy
the requirements for electrical equipment for poten-
tially explosive areas according to DIRECTIVE 94/9/
EG OF THE EUROPEAN COUNCIL OF MARCH 23, 2014
for intended use in potentially explosive areas of the:
Equipment group II Category 2 application conditions
for Zones 1 and 2.
Devices in this category are only intended for use in areas
in which it can be expected that an explosive atmosphere
of gases, condensates, mists or dust/air mixture could oc-
casionally occur. The following standards are decisive for
ex-relevant implementation for ex-protected submersible
motors for the electrical and mechanical part.
EN 60079-0:2006 „General determinations“
EN 60079-1:2007 Flameproof enclosures „d“
EN 60079-7:2007 Enhanced security „e“
EN 60079-11:2007 Intrinsic safety „i“
EN 1127-1:2007 Potentially explosive atmospheres -
explosion protection
Part 1 - Fundamentals and methods
EN 13463-1:2009 Part 1:Non-electrical equipment for use
in potentially explosive areas
Fundamentals and requirements.
EN 13463-5:2003 Protection by constructional safety „c“
Definition of the ignition protection type
The design direction for ex protection of the HOMA-
produced explosion-protected equipment is achieved by
means of
Ignition protection type: pressure-tight enclosure „d“.
In this, the parts that can ignite a potentially explosive at-
mosphere are arranged in a housing that, in the explosion
of a potentially explosive mixture inside it, withstands the
pressure and thus prevents a transfer of the explosion
to the potentially explosive atmosphere surrounding the
housing. Equipments that possesses a separate connec-
tion chamber, additionally satisfy the requirements of the
ignition protection type. Enhanced security „e“.
In the case that instrument lines are fed for connection
from simple electrical equipment corresponding to EN
60079-11 PARA. 5.4 through the pressure-tight enclosed
chamber (conductance measurement, float switch as leak
monitoring, etc.), then these satisfy the requirements
of ignition protection type. Intrinsic safety „i“. The igni-
tion type of safety „c“ is applied in order to adhere to
the device protection in explosive- endangered areas for
non-electrical equipment (mechanical ex-protection). For
this purpose it is possible to make use of structural mea-
sures, which, by means of sufficient dimensions of the
components, provide protection against possible ignition
by moving parts, generated heated surfaces, sparks and
adiabatic compression.