The SIEMENS QRI2B2.B180B is an infrared (IR) flame detector designed for use in industrial burners. It features both side and frontal (90°) viewing and is suitable for continuous or intermittent operation in burners of any capacity. It includes an integrated, self-checking flame signal amplifier and is secured to the burner with a flange and clamp. The detector is sensitive to infrared radiation up to a maximum of 2 µm, covering flames from gas, oil, and coal as well as other IR sources.