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Appendix 2
ATEX dust certification
A2.0 ATEX dust certification
In addition to ATEX certification permitting
installation in explosive gas atmospheres which is
described in the main section of this instruction
manual, the BA304D is available ATEX certified for
use in the presence of combustible dusts. If
ATEX dust certification is required it must be
specified when the BA304D indicator is purchased.
WARNING
Before installing a BA304D indicator in
the presence of a combustible dust,
ensure that the certification information
label which is located on the top of the
instrument specifies dust certification -
see section A2.2
A2.1
Zones and Maximum Surface
Temperature
The BA304D has been ATEX certified as Group II,
Category 1 GD apparatus Tamb = -20 to 60°C,
with a Maximum Surface Temperature of 80°C.
When installed as specified by EN 61241-14
‘Selection, installation and maintenance of
electrical apparatus protected by enclosures’, the
indicator may be installed in:
Zone 20
explosive atmosphere in the form of
a cloud of combustible dust in air is
continuously present, or for long
periods or frequently.
Zone 21
explosive atmosphere in the form of
a cloud of combustible dust in air is
likely to occur occasionally in normal
operation.
Zone 22
explosive atmosphere in the form of
a cloud of combustible dust in air is
not likely to occur in normal
operation, but if it does occur, will
only persist for a short period.
Be used with dusts having a Minimum Ignition
Temperature of:
Dust cloud
120°C
Dust layer on BA304D
155
°
C
up to 5mm thick
Dust layer on BA304D
Refer to
over 5mm thick.
EN 61241-14
At an ambient temperature between -20 and
+60°C
A2.2 Certification Label Information
The certification label is fitted in a recess on the
top outer surface of the enclosure. It shows the
ATEX dust certification information including the
maximum surface temperature and ingress
protection, plus the ATEX gas certification
information. Non European information may also
be shown.
The instrument serial number and date of
manufacture are recorded on a separate label
inside the terminal compartment.
A2.3 Calibration & maintenance
The ATEX dust certification relies on the indicator
enclosure being dust-tight. Therefore the control
and terminal covers should only be removed when
dust can not enter the instrument enclosure.
Before replacing the control and terminal covers
ensure that the sealing gaskets are undamaged
and are free from foreign bodies.
