A1.2 Special conditions for safe use in dust
atmospheres.
The BA367NE ATEX Type Examination Certificate
has an 'X' suffix to show that special conditions for
safe use are specified by the BA367NE Ex ic tc
certificate indicated by the certificate number's 'X'
suffix. These state that the BA367NE Counter
should be:
a. Mounted such that the instrument terminals
are protected by at least an IP54 enclosure
certified to IEC 60079-15 or IEC 60079-0 as
appropriate.
Note:
An Ex t, Ex n, Ex e or Ex p certified
enclosure satisfies this requirement.
b. Instrument terminals must be supplied from
limited energy circuits.
Note:
This means that the BA367NE should
only be connected to circuits with output
parameters in normal operation equal to, or
less than the instruments input parameters
which are the same as the Ex nA input
parameters specified in section 3 of this
manual.
A1.3 Maintenance
The IEC guidance on maintenance procedures
EN 60079-17 permits live maintenance in Zone 22 if
a risk analysis demonstrates that this does not
introduce an unacceptable risk. The removal of
covers [opening of Ex tc enclosure] is permitted if
this can be done without contaminating the interior of
the enclosure and instrument with dust or moisture.
Some end-users may prefer not to permit live
maintenance to minimise risk.
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
Live maintenance within the hazardous
area should only be performed when it is
permitted by risk analysis or when there is
no risk of a flammable atmosphere being
present.
Before closing the Ex tc enclosure ensure
that the sealing gaskets are undamaged
and free from dirt and foreign bodies.
Inspection of
t
he Counters mechanical condition and
removal of accumulated dust from the front of the
instrument and the outside of the panel enclosure
should be regularly performed. The interval between
inspections depends upon environmental conditions.
Removal of flammable dust should be performed
with care to avoid creating a dust cloud.
Appendix 2 IECEx certification
Appendix 2 IECEx certification
A2.0 The IECEx Certification Scheme
IECEx is a global certification scheme for explosion
protected products which aims to harmonise
international certification standards. For additional
information about the IECEx certification scheme
and to view the BEKA associate certificates, please
visit www.iecex.com
A2.1 IECEx Certificate of Conformity
The BA367NE Counter has been issued with an
IECEx Certificate of Conformity number
IECEx ITS 16.0005X which specifies the following
certification code:
Ex nA ic IIC T5 Gc
Ex ic tc IIIC T80ºC Dc IP66
-40ºC
≤
Ta
≤
60°C
The IECEx certificate may be downloaded from
www.beka.co.uk, www.iecex.com or requested from
the BEKA sales office.
The Counter's front panel push button contacts are
non incendive and have been certified intrinsically
safe Ex ic, without the need for an external Zener
barrier or galvanic isolator, as shown on the IECEx
certificate. This allows the Counter to be adjusted
and configured live when installed in a Ex n panel
enclosure located in Zone 2.
A2.2 Installation
The IECEx safety parameters are identical to the
ATEX safety parameters described in the main
section of this manual and both refer to equivalent
standards. Therefore the ATEX installation
requirements specified in the main sections and in
Appendix 1 of this manual, also apply for IECEx
installations, but the local code of practice should
also be consulted.
For ATEX installations self certified Category 3GD
equipment, such as enclosures, may be installed in
Zone 2 or 22, but self certified equipment is not
permitted for IECEx installations.
A2.3
Special conditions for safe use
The IECEx certificate number has an ‘X’ suffix
indicating that special conditions apply for safe use.
These conditions are identical to the ATEX special
conditions for safe use specified in the main sections
and in Appendix 1 of this manual.
39
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