Features • Unique optical sensing chamber • Superior single-to-noise ratio • Built-in signal processing • 3.0% nominal sensitivity • Built-in test capability • Low stand by current • Designed for direct surface or electrical box mounting • Insect resistant screening The 2400 Series photoelectric detectors are specifically designed to meet the stringent performance requirements of industrial and municipal fire detection/alarm systems. The design of these detectors emphasizes ease of installation and field maintenance.