Quick response rate-compensated design. Combining the best features of both fixed temperature and rate-of-rise thermal detection, these units accurately sense the surrounding air temperature regardless of the fire growth rate. Designed with a rugged outer shell, these units can withstand various shock and vibration conditions. Easy-to-install and self-resetting, various units are available for specific applications including intrinsically safe (with listed barriers), explosion-proof, corrosive and high-temperature/humidity environments. Temperature rating 140°F-725°F.