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6000 Series Purge/Pressurization System
General instructions regarding ATEX
1. The guidelines
The guideline 2014/34/EU determines the essential
health and safety requirements relating to the design
and construction of equipment and protective systems
intended for use in potentially explosive atmospheres,
given in Annex II of the directive.
The guideline 1999/92/EG is addressed to the operator/
user of facilities in explosive areas and governs the
safety regulations of persons during installation, handling,
and maintenance.
Furthermore, local laws and rules for electrical
installations and accident prevention have to be
observed.
2. General information for this manual
Preconditions for handling and operating the series
6000 controller safely are basic knowledge of safety
regulations and additional training and experience in
explosion protection.
This user manual contains important information and
instructions to handle the series 6000 controller in
explosive areas safely and to operate it according to
guideline 2014/34/EU.
This user manual, in particular the safety instructions,
has to be observed by everybody who works with the
components.
3. Responsibilities of users and installers
This equipment shall only be used within its
intended purpose. Refer to the manual for proper
Warning
usage.
The user and/or the installer is obligated to let only
competent, trained persons work at the 6000 Control Unit
who
• are familiar with the regulations about safety and
accident prevention and briefed in handling of the
component.
• are trained to work on explosion protection
equipment.
• know the appropriate instructions and rules for
the installation, handling, and maintenance of
explosion protected equipment.
2
4. General information about pressurized enclosures
The pressurized enclosure is one of the most
multifunctional applicable types of protection. It is based
on a first flush operation which removes potential,
ignitable gas mixtures of the local environment from
the enclosure. After the flush, the overpressure will
be maintained by adding as much pressurized air as
necessary to compensate for the leaks of the enclosure
or components. This constant overpressure status
protects against the diffusion of potentially explosive
atmospheres.
During the flush, the internal pressure will be up to
10-12 mbar. In the operation phase, it is reduced to
2-3 mbar. Hot spots at single components inside the
enclosure are monitored by temperature sensors
(optional) and if required turned off. This assures that no
unacceptable surface temperature will occur.
For applications with hazardous dust, the purge process
is omitted because purging would raise explosive dust.
Instead of pre-purging, the interior of the housing is
inspected for dust and cleaned manually if dust is
present.
For this reason, the pressurized enclosure is especially
suited for the use of non-Ex certified equipment in Ex-
areas.
The enclosure has to be prepared specially for the use of
Ex p:
• all walls have to be additionally armed
• the doors have to be specially constructed
• tested for mechanical stability
• tested for overpressure resistance
When using an inert gas like nitrogen, an
asphyxiation hazard can exist.
Warning
EN 60079-2 and IEC 60079-2 do not cover both gas
and dust hazard atmospheres. The 6000 system
Note
provides a solution for both at the same time but
would have to be evaluated by the certification
bodies for approval.
I/O Manual
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