COLASIT AG
Plastic construction
CH-3700 Spiez
Phone +41 (0)33 655 61 61 Fax +41 (0)33 654 81 61
TD-000 675-E
Edition 10/2019, Subject to alteration
Copyright by COLASIT AG Spiez
Page 8
On ATEX certified fans, the external grounding terminal of the motor and fan
must be connected to a potential equalization system.
Motors with protection type "e" are standard for using in the explosion-proof design of our fans. The
standard version of the motors used complies with temperature class T3 (maximum surface temperature
200ºC). As special-purpose design, motors with protection type "d" or motors with temperature class T4
(maximum surface temperature 135°C) are also available.
The user must define a suitable temperature class for his application that does
not reach the ignition temperature of his conveyed medium.
Please also observe the specifications in the operating instructions of the motor
manufacturer.
The thermal motor protection must be connected in compliance with the
manufacturer's specifications (operating instructions).
If a frequency converter is fitted, we recommend using pressure-proof enclosed
motors. In addition, a certified PTC resistor releasing device must be fitted.
The following specifications must be included on the motor rating plate: min and
max frequencies, min and max speeds, min and max torque or output, limit
temperature PTC and PTC release time.
2.1
Fan Ex marking
The Ex marking is located on the rating plate of each ATEX fan. On a fan of Equipment Category 2
(Zone 1), it looks like this
II 2/3G
Ex h
II
B+H
2
T3
Gb/Gc
CE-marking
Marking denoting prevention of explosions
II
Equipment Category II, for all Ex applications which do not
fall in Class I (mines and surface workings).
2/3G
Equipment Category inside/outside the fan
Equipment Category 2 is the equivalent of Zone 1 and
Equipment Category 3 is the equivalent of Zone 2
“G“ fan fort he conveyance of explosive gases
Ex h
Protection type „design safety“
IIB+H
2
Equipment Category (gases)
T3
Temperature class T3: Max. surface temp. 200 °C
T4: Max. surface temp. 135 °C
Gb/Gc
Equipment Protection Level (EPL)
2.2
Correct installation of ATEX fan
The fan must be installed properly to guarantee trouble-free operation. To document proper installation, you
will find a form on the last pages of this operating manual. The fitter must confirm the proper installation item
for item on this form.
The signed form must be kept by the safety officer or operating company.
COLASIT also offers a comprehensive installation service for fans.
