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Technical details
Use of Ex fans
Explosion-proof, fully adjustable, low-pressure, centrifugal
fans RP * - * / * - ** Ex (hereinafter only RP Ex) they can
be used universally, from simple ventilation to complex air
conditioners for complex air treatment. Due to the special
construction preventing the formation of mechanical spark
sparks according to the standards ČSN EN ISO 80079-
36, ČSN EN ISO 80079-37, ČSN EN IEC 60079-0 and the
secured design "e" with the level of protection "eb" of the
electric motor according to ČSN EN 60079-7 the fans are
intended for use in environments with a risk of explosion of
gases and vapors.
Operating conditions, location
RP Ex fans are approved by the Notified Body No. NB 1026,
Physical-Technical Testing Institute, sp, Ostrava- Radvanice.
The fans are designed for indoor and outdoor use. It is used
for air transport without solid, fibrous, sticky, aggressive
admixtures. The air must not contain chemicals that cause
corrosion of zinc, copper and aluminum. The permissible
supply air temperature is in the range of -20 to + 40 ° C.
From the point of view of the classification of areas with a
risk of explosion according to ČSN EN 60079-10-1, the fans
are designed for the environment and for the extraction of
air from the environment.zone 1 or zone 2. Explosion-proof
electric motors of RP Ex fans are in the secured design "eb"
according to the standard ČSN EN 60079-7 and belong to
the group II according to the standard ČSN EN IEC 60079-0
and are markedby sign of non-explosiveness:
II 2G Ex eb IIC T3 Gb.
RP Ex fans are marked with a non-explosive symbol
II 2 / 2 G Ex h IIB+H
Figure 1 –
legend of RP Ex fan explosion mark
Marking according to Directive No. 2014/34 / EU
explosion proof symbol
II
equipment group - equipment for surface
applications in explosive atmospheres
2/2 G
equipment category - fan extracting from zone 1,
located in zone 1
Marking according to standard ČSN EN ISO 80079-36: 2016
Ex h
non-electrical equipment:
– protection by safe construction "c"
– air distance between parts, IP
IIB+H
subgroup of gases according to the properties of
2
an explosive gas atmosphere
T3
temperature class, maximum surface temperature
of the device T ≤ 200 °C
Gb/Gb
equipment protection level (EPL) for the interior
and exterior of the equipment
The fans can work in any position.
When placing RP Ex fans under the ceiling, it is advisable
to mount the fan with the motor cup facing downwards for
better access to the terminal box and the motor.
If the air is saturated with moisture or there is a risk of in-
tense inside the fan steam condensation, we recommend
T3 Gb / Gb
.
2
RP fans * - * / * - ** Ex
mounting the fan with the motor cup facing upwards.
To achieve lower pressure losses in the assembly, we reco-
mmend designing a straight pipe with a length of 1 ÷ 1.5 m
for the fan discharge.
Dimensional range
Figure 2 – dimensional range
A x B [mm]
400-200
40-20
50-25
500-250
600-300
60-30
600-350
60-35
700-400
70-40
800-500
80-50
of hot - dip galvanized (Zn 275 g / m2) of steel or stainless
steel sheet. Impeller blades are made of galvanized sheet
steel, copper diffusers, electric motor housing made of alu-
minum alloys. The internal construction of electric motors
consists of steel, copper and plastic parts. All materials are
carefully inspected, inspected and guarantee a long service
life and reliability of the fans.
Impellers
The impellers of RP Ex fans have forward curved blades.
The direction of rotation must be checked after connecting
the electric motor. The impellers must always be turned to
the left, counterclockwise (from the point of view of the in-
spection hole on the pan). The inspection hole on the motor
bowl is closed with a rubber seal. The impellers, together
with the motor, are perfectly statically and dynamically ba-
lanced.
Motors
Figure 3
during operation. women with flowing air. High-quality en-
capsulated ball bearings with permanently lubricated mo-
tors enable a fan life of more than 40,000 operating hours
to be achieved without maintenance.
RP Ex fans
are produced in six
sizes, referred to in
according to size
A x B [cm] connecting
flanges, see Figure 2.
Manufactured as stan-
dard dimensional and
performance
many non-explosive
fans allows designers
optimize use all para-
meters nozzles for air
flow up to 5,800 m
/h.
3
Materials
The outer casing of RP
Ex fans and the conne-
cting flanges are made
Compact asynchronous
ones are used for the drive
three-phase motors with
external rotor and resistan-
ce armature, correspon-
ding to the power and spe-
ed approved according to
Directive 2014/34 / EU
(ATEX 114), see Figure 2.
The electric motors are
housed inside the impeller
and are optimally cooled
3
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