BEKA BA364E, Manual

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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
BA364G Couinter also has ATEX dust certification.
A1.1 Zones, and Maximum Surface
Temperature.
The BA364G has been certified
Group II Category 1D Ex ia IIIC T80°C Da,
Ta = -40º to 60ºC. When connected to a suitable
system it 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 dust in subdivisions:
IIIA combustible flyings
IIIB non-conductive dust
IIIC conductive dust
Having a Minimum Ignition Temperature of:
Dust cloud 120°C
Dust layer on Rate 155°C
Totaliser up to 5mm thick
Dust layer on Rate Refer to
Totaliser over 5mm thick. EN 60079-14
At an ambient temperature between -40 and +60°C
A1.2 Installation and maintenance
The installation requirement described in the main
sections of this manual for use in a gas explosive
atmospheres also apply when the Counter is
installed in a dust potentially explosive atmosphere.
The instrument assembly should only be removed
from the enclosure back-box when dust can not
enter the instrument enclosure. Before replacing the
instrument assembly the sealing gasket should be
inspected to ensure that it is undamaged and free
from foreign bodies.
It is good practice to prevent dust accumulating on
the Counter enclosure.
If this can not be avoided,
care should be taken to ensure that the layer
thickness does not exceed 5mm for dusts having a
minimum ignition temperature of 155°C.
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