How do you select and apply flame detectors for fire protection?

Flame detector selection: UV (ultraviolet) - fast response to hydrocarbon flames, can have false alarms from welding/lightning; IR (infrared) - detects CO2 emission, single-frequency can false alarm from hot objects; UV/IR combination - reduces false alarms by requiring both spectra; Multi-IR (triple IR) - highest false alarm immunity, works through smoke; Video-based - wide coverage, analytics for verification. Selection factors: fuel type, environmental conditions (sun exposure, rain, steam), response time requirements, coverage area, and false alarm tolerance. Placement considers cone of vision, distance, and potential obstructions. Outdoor applications often use UV/IR or triple-IR. SIL rating required for automatic suppression activation.