Pfannenberg Catalogue
Pfannenberg Catalogue
Pfannenberg Catalogue
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ATEX guarantees your safety<br />
ELECTRO-TECHNOLOGY FOR INDUSTRY<br />
Types of protection systems<br />
The European standards describe eight different explosion<br />
protection methods that can be applied in order to make<br />
electrical equipment suitable for use in the various ex zones.<br />
The different types of protection vary widely with regard to the<br />
degree of complexity and some of them are not usable with<br />
mobile equipment, for example. The type of ignition protection<br />
is selected with the greatest of care for <strong>Pfannenberg</strong> devices<br />
in order to guarantee the best possible cost-benefit ratio.<br />
<strong>Pfannenberg</strong> uses the following protection systems for its<br />
alarm equipment:<br />
Flame proof enclosure ‘d’<br />
In the case of pressure-resistant encapsulation, the actual<br />
operating equipment is built into a pressure-resistant housing.<br />
In the event of an explosion inside, the housing prevents an<br />
ignition breakthrough into the surrounding area. The explosion<br />
is therefore restricted to the interior of the device. On account of<br />
the necessary wall thickness, devices in this protection system<br />
are of a very sturdy construction and thus also often very well<br />
suited for adverse environmental conditions.<br />
Enhanced safety ‘e’<br />
This type of enhanced protection is usable with only a few types<br />
of equipment/components (e.g. terminals). This type of protection<br />
is conveniently often combined with pressure-resistant<br />
encapsulation. In alarm products, this means that all essential<br />
components are housed in the pressure-resistant housing and<br />
only the connection terminals are accessible in the increased<br />
safety housing. For this reason <strong>Pfannenberg</strong> also offers most<br />
devices with an ‘e connection box’ in order to enable simple and<br />
safe electrical connections to be made. The sensitive electronic<br />
components are therefore protected against accidental damage<br />
during mounting.<br />
Technology<br />
Intrinsically safety ‘i’<br />
In the ignition protection type ‘i‘, the current and voltage of all<br />
energy storage devices as well as the complete device are<br />
limited to the extent that no ignition sparks and no excessively<br />
hot surfaces can be generated. An explosive atmosphere can<br />
develop, but it will not be ignited.<br />
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