page 22 of 91 USB-QFLCII-14804/0
The classifications of hazardous areas is the responsibility of the owner
or the designated design team of the company.
Possible additional classifications shall be defined if explosive
gases are involved.
3.8.3 Avoiding sources of ignition
Access to areas presenting a fire and explosion hazard shall be
marked with a prohibition sign, “fire, open flame and smoking
prohibited” and clearly visible.
Measures to
avoid ignition
sources
Please adhere to the following measures to avoid ignition sources and reduce the
fire and explosion hazard
•
Ensure that objects which may create sparks (hard objects such as metal
parts) cannot be sucked in by the system. A spark pre-separator can
reduce this ignition hazard.
•
Do not throw cigarette butts or other smoldering objects into the
operating area of the system (smoking ban). Otherwise these objects
may be sucked in.
•
In addition, objects, which can get caught in a fan that is installed at the
inlet side and create frictional heat, must not be exhausted.
•
Do not use working material which is unsuitable within the explosion
protection zone.
•
In hazardous areas, no tools can be used which may create showers of
sparks.
•
Install lightening protectors on systems that are situated outdoors.
•
Maintain rotating parts/bearings to avoid frictional heat (lubricate according to maintenance
instructions).
Potential equalization
The inlet isolation device is equipped with continuous grounding to avoid spark
discharge
.
Grounding points are labeled with the symbol to the left.
Operator must connect the inlet isolation device via the ductwork to the protective system
provided by the customer.
If plastic hoses are used, they must be bridged via grounding wires or by
inserting wire spirals. Plastic material must be dissipative.
If grounding cables were removed during servicing, they must be properly
reattached before restarting the unit.
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