COLASIT AG
Plastic construction
CH-3700 Spiez
Phone +41 (0)33 655 61 61 Fax +41 (0)33 654 81 61
Editione 2010 / Subject of alteration
Copyright by COLASIT AG Spiez
Page 8
2 Explosion
protection
COLASIT plastic fans are suitable for the conveyance of gases in Zone 1 or 2 (Equipment Category
1 or 2) depending on the model. COLASIT plastic fans are not suitable for the conveyance of gases
in Zone 0 (Equipment Category 1).
The zone classification of the conveyed medium and the site of installation must be made known by
the fan operator so that COLASIT can take the necessary measures to prevent the risk of ignition.
The explosion-proof COLASIT fans are not suitable for the conveyance of
explosive dusts.
No modifications may be made to ATEX-certified fans. All work on the fan may
only be carried out by ATEX-trained skilled personnel.
Otherwise the ATEX Certificate will lose its validity.
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.