Heylo ComPact 1500 EX, User Manual

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(4) Information on explosion-proof applications
(1) Zones - Explosion groups - Temperature classes
(2) Explosion protection | Classification
(3) Division into temperature classes
Zones - Explosion groups - Temperature classes
Introduction
Explosive areas are divided into zones; the apparatuses into device groups and device categories.
Given a certified unit, the marking on the type plate reveals, for which zone the explosion-proof
apparatus may be used.
Division into device groups
The device groups are divided up into group I and II, whereby group I deals with underground mining,
and group II covers gas and dust explosion protection in all other applications.
Division into zones
Explosive areas are divided up into six zones whereby the division depends on the probability of how
frequently and for how long it has to be calculated that a hazardous explosive atmosphere occurs. A
differentiation is made between combustible gases, mists, steams and combustible dusts.
For gases, mists, vapours zones 0, 1 and 2 apply whereby the demands on the apparatuses used
there increase from zone 2 to 0. Apparatuses for zone 0 have to be built in such a way that “a
sufficient explosion protection is ensured even when an ignition protection type fails or when two
failures occur”. For example, a potential-free sensor passively installed in zone 0, which is operated in
an intrinsically safe current circuit (II2(1)G [EEx ia] IIC), has an additional own approval.
For dusts zones 20, 21 and 22 apply whereby the demands on the apparatuses used there increase
from zone 22 to 20. Equipment for zone 20 and 21 have to be approved especially for this use.
PV4200 EX is not suitable for explosive dusts.
Explosion protection | Classification
Zone 0