The 30-2021-24 and 30-2021E-24 Ultraviolet Flame Detectors are highly sensitive to the ultraviolet radiation given off by all types of flames, including those produced by flammable liquids and gases.
Model 30-2021-24 is contained in a general purpose enclosure and is intended for indoor use only. It mounts on a standard 4" (10.16 cm) octagonal electrical junction box (not included)
Model 30-2021E-24 is intended for indoor use and is contained in an explosion-proof enclosure that meets all requirements for NEC Class I Groups C and D; Class II Groups E, F, and G; and Class III hazardous locations
Specifications
NEC Class I Groups C and D
Class II Groups E, F, and G
Class III Hazardous Locations