S&P CE ATEX Mode D'emploi page 27

• Inadequate maintenance. Maintenance must be carried out by quali ed and experienced
personnel and must be in accordance with the manufacturer's instructions given in this
manual.
• Fans of the TD and TH ranges must not be installed or used in unclean or unsupervised
environments.
SPECIFIC RISKS IN EXPLOSIVE ATMOSPHERES. IMPROPER USE
During use of a fan in an explosive atmosphere and/or with explosive gases, the
following potentially dangerous ignition sources must be taken into account:
• Improper use. The fan must not be used outside the ATEX application limits indicated on
the name plate.
• Environmental considerations: The following parameters must be observed:
a) Ambient temperature
b) Ambient humidity
c) Environmental corrosiveness
d) Environmental pollution
• Formation of sparks through friction or impact between rotating parts (propeller, impeller,
etc.) and xed parts (casing, mouth, volute, etc.).
• Formation of sparks through friction or impact of foreign bodies or residue sucked into
the fan.
• Formation of sparks due to the discharge of electrostatically charged components.
• Formation of sparks due to dust deposits forming clouds or thick layers.
• Hot surfaces due to excess strain or heat produced by friction between rotating and sta-
tionary parts.
• Excessive vibration (e.g. due to unbalance) which can cause some components to overheat
or cause rotating and stationary parts to come into contact with each other.
• Zone transfer. Depending on their use, some fans may leak between the internal and ex-
ternal parts, or vice versa, and this must be taken into account. These leaks occur mainly in
the area of the shaft passage, at the junction between the different parts of the fan casing
and between the fan and the installation.
• Lightning. If lightning strikes in an explosive atmosphere, ignition will always occur. There
is also the possibility of ignition due to the high temperatures, which may occur in the me-
tal parts conducting the shock. For this reason, installations must be equipped with surge
protection systems in suitable locations.
• Electromagnetic and radio frequency waves. All systems that produce and use high-fre-
quency electrical energy, laser radiation or solar radiation may cause the ignition of an
explosive atmosphere. Appropriate measures must be taken to prevent this.
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