The units have been tested to EN 60079 – 15 and are approved for use in Class 1 Zone 2 Category 3G explosive atmospheres.  PULS says no electrical changes were necessary to achieve the approval and that the Standard had been met in essence by dual conformal coating the internal components of the units.  

An explosive atmosphere is created when dust, mist or gases become mixed with the air and produce a flammable substance.  Many industrial environments may contain, or have the potential to produce, an explosive atmosphere. Examples include places where production activities create or release flammable gases or vapour, such as paint spraying, or in factories handling fine organic dusts such as grain flour or wood.

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