The invention discloses an
infrared multiparameter fire and
gas detector which comprises a shell and an optical window
assembly, a
detector element array, a fire alarm indicator light and a main
control circuit board installed inside a cavity of the shell, wherein the
detector element array is a composite
fire detector; the optical window
assembly comprises an optical lens and a fastening and locating
assembly thereof, and the fastening and locating assembly is used for fastening and locating the optical lens in an elastic soft touch manner; and the
detector element array at least comprises three
pyroelectric detectors with center wavelengths of 3.8 mum, 4.3 mum and 5.0 mum respectively. A plurality of
pyroelectric detectors with different bands are used for detecting flames and environment background signals, a
signal collected by an intelligent
infrared CO / CO2
gas detector is combined, a temperature
signal detected by
lead sulfide can also be used as an aid, the fusion of information from multiple sensors is realized, and the purposes of alarming in advance and reducing false alarms are better reached. The fire and
gas detector provided by the invention has compact structure, small size, high reliability and high sensitivity to early
fire detection and is not influenced by
sunlight and visible light, and the total design conforms to the explosion proof requirements in national standards.