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Appendix 1
ATEX dust
certification
A1.0 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 BA334D is available
ATEX certified for use in the presence of
combustible dusts. If ATEX dust certification
is required it must be requested when the
BA334D totaliser is purchased.
WARNING
Before installing a BA334D totaliser
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 A1.2
A1.1 Zones and Maximum Surface
Temperature
The BA334D has been ATEX certified as
Group II, Category 1 GD apparatus Tamb =
-20 to 60
o
C, with a Maximum Surface
Temperature of 80
o
C. When installed as
specified by EN 50281 Part 1-2 ‘Selection,
installation and maintenance of electrical
apparatus protected by enclosures’, the
totaliser 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
o
C
Dust layer on BA334D
155
o
C
up to 5mm thick
Dust layer on BA334D
Refer to
over 5mm thick.
EN500281
part 1-2
At an ambient temperature between -20 and
+60
o
C
A1.2 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.
A1.3 Calibration & maintenance
The ATEX dust certification relies on the
instrument 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.
Summary of Contents for BA334D
Page 12: ...12 Fig 7 Dimensions and terminal connections ...
Page 14: ...14 ...
