A potentially explosive atmosphere may contain gases, mists, vapours or dust that form in factories or other areas in which flammable substances are continuously or occasionally present.
An explosion can occur when flammable substances and a source of ignition are present simultaneously in a potentially explosive atmosphere.
A source of ignition can be:
Products subject to approval are all those which, during normal use or due to a malfunction, present
one or more sources of ignition for potentially explosive atmospheres.
Responsibility lies both with the manufacturer of the device and whoever installs it in equipment that is to operate in a hazardous atmosphere.
This requires co-operation between the parties to ensure correspondence between the category of device and the hazardous area in which it is to operate.
The manufacturer of the device must comply with the specifications and classify the product according to directive 94/9/EC. The manufacturer of the equipment, who knows the area in which the device will be operating, must select a suitable device according to the category, pursuant to directive 99/92/EC.
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