The SS4 is a hazardous area certified flame detector for the detection of hydrocarbon (SS4-A2) and nonhydrocarbon fires (SS4-AS2). This multispectrum detector senses radiant energy in the ultraviolet (UV), visible and wideband infrared (IR) spectrum. The radiant energy from all types of flaming fires will alert the detector to their presence. The field of view is the widest in the industry with 120 degree cone of vision with a range of 60 feet. This means more hazard can be covered by each detector.