Features • Factory preset at 1.5% nominal sensitivity • Removable cover for field cleaning • Visible LED "blinks" in stand-by • Sealed against dirt, insects and back pressure • 8.5-35 VDC operating range The 1400 Series ionization type smoke detectors are specially designed to meet the stringent perform-ance requirements of industrial and municipal fire detection/alarm systems. The design of these detectors emphasizes ease of installation and field maintenance.