Flame Sensor, Infrared (Lead Sulfide). Overview The C7915 Flame Detectors include a lead sulfide photocell that is sensitive to the infrared radiation emitted by the combustion of fuels such as natural gas, oil, and coal. Features Used for combination or dual-fuel applications. Detects pilot and main flame. Mounts quickly and easily on a standard 3/4 in. sighting pipe. Works where flame rod or rectifying photocell mounts are difficult to apply. The C7915 includes 50019469-001 Bushing with magnifying lens. The C7915 uses photoconductive lead sulfide cells 32007255-001. Product Specifications Application Used for combination or dual-fuel applications Dimensions (in.) 1 1/4 in. diameter x 2 1/4 in. long Dimensions (mm) 32 mm diameter x 58 mm long Includes With magnifying lens, 32007255-001 Cell Used With Flame Amplifiers: R7852 Comments Infrared (Lead Sulfide) Flame Detector Mounting 3/4 in. NPT Approvals, Underwriters Laboratories Inc. Listed: File No. MP268, Guide No. MCCZ Approvals, Canadian Standards Association Certified: Master Report LR95329-1 Electrical Connections Two no.18 AWG wires Approvals, Swiss RE Acceptable Approvals, Factory Mutual Approved: Report No. 24181.03 Type Infrared (Lead Sulfide) Ambient Temperature Range (F) -20F to 125F operating range Ambient Temperature Range (C) -18C to 52 operating range Lead Length (in.) 30 in. Lead Length (mm) 762 mm