Checking the Usage in Potentially Explosive Atmospheres
Marking
Use as follows
• Class I: Flammable gases or vapors may be present.
• Division 1: Ignitable concentrations of hazards exist under normal operation conditions
and/or where the hazard is caused by frequent maintenance or repair work or frequent
equipment failure.
• Group D/ IIA: Explosion group for gases (acetone, ammonia, benzene, butane, ethanol,
gasoline, hexane, methane, methanol, methane, naphtha, natural gas, propane and toluene).
• T1: maximal surface temperature (842°F).
• Ta: Ambient temperature.
• Zone 0: The device may be used in a place in which an explosive atmosphere is continually
present.
• Ex: Explosion protection.
• AEx: Explosion protection approved to US standards.
• ia: Type of ignition protection: intrinsic safety for zone 0.
• Ga: Equipment protection level for zone 0.
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