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04.06.2019
explosion-proof roof fan
WPA-D-N/Ex
2.
Application
WPA-D-N/Ex
explosion
-
proof roof fans
are intended for use in areas of explosion
risk, where
explosive atmosphere, (i.e. mixture of flammable substances in form of gas and vapour with
the air, whereby after ignition
– in atmospheric conditions
– the burning mass would expand
within the whole non-burning mixture)
is likely to occur. The fans have been constructed for
application within temperature range -20 up to 40
C. The forwarded air must be dry, of dus-
tiness not exceeding 0,3 g/m
3
, without viscous, aggressive contaminants and of maximum
tempe60
C.
Increased fan pressure guarantees their application in systems with local exhausts and filte-
ring units, and additionally in ventilation ductings of significant flow resistances.
According to
the 2014/34/EC ATEX Directive and
EN ISO 80079-36 the
device carries the
level
of
protection
:
“
HIGH
” –
as a device classified
for
Group
II,
Category
2,
and it can
work in areas where explosive atmospheres are likely to occur.
The fan
can be applied
in zones 1
,
2
(
G
).
The appliance is marked on the nominal data plate:
II 2 G c Ex e II T3
Marking
of
the
operational
conditions
of
the device
:
group / category / hazard / class
.
marking for explosion proof properties of the appliance,
group II
– the device
is
designed
for
on-ground work,
in factories,
in areas
of
explosion
hazard,
but this cannot be methane
(
firedamp
)
hazard
neither carbon dust occurrence,
category 2
– the device is designed
for application in areas where
explosive atmosphe-
res are likely to occur
,
gas hazard G
,
“
c
” – a sort of protection against ignition – constructional protection,
Ex
– mark of the electrical device –
constructed
and
tested according
to the European Stan-
dards for work in areas of explosion hazard,
execution
“
e
” – type of construction of the motor (a motor of increased safety)
gas explosion
group
II
–
occurring
in on-ground factories
– the fans are constructed accor-
ding to
the PN-EN 14986:2009
, whereby they can be applied for gases in explosion groups
IIA
and
IIB
and
hydrogen
,
temperature
class T3
–
the surface
temperature
of any
part
of the
appliance should
not
ex-
ceed
200ºC
(during the normal operation). The device can be used safely
in explosive at-
mospheres
belonging to temperature classes
T1
,
T2
,
T3
.
3.
Reservations of Producer
A
.
Manufacturer accepts no liability
for any consequences following from the operational use
that is in contradiction to the purpose of application.
B
.
Installing of
any additional elements not belonging to the normal device structure (
or acces
-
sory set) is not acceptable.
C
.
Do not undertake
any structural changes or constructional modifications on the device on
one
’s own.
D
.
Protect the appliance’s housing from mechanical damage.
E
.
Prior to
installing
check the load carrying capacity
of the building structure
where the device
will be mounted. Unsure mounting could cause hazard to personnel/people in vicinity and
effect in damage of the device.
F
.
Do not use
the fan
for
conveying
the air
containing viscous impurities that
could deposit
(
build up
)
on the device surface, especially on the impeller.
G
.
Neither use it for forwarding the air with aggressive pollutants which will
destructively effect the device structure.
