Designed for FS-250 Control Panels, the two-wire, plug-in HFPO-11/HFP-11 Intelligent Smoke Detector Intelligent Smoke Detectors provide the most reliable detection system available with state-of-the-art microprocessor circuitry with error check, detector self-diagnostics, and supervision programs. The HFPO-11 intelligent fire detector is compatible with the DPU field device programmer/tester unit, which is a compact, portable, menu-driven accessory for electronically programming and testing detectors, easily and reliably. The DPU eliminates the need for cumbersome, unreliable mechanical programming methods and reduces installation and service costs by electronically programming and testing the detector prior to installation. The HFPO-11 fire detector has a dust resistant, field-cleanable photo-electric chamber, and micro-processor based electronics with a low-profile plastic housing. The HFPO-11 utilizes state-of-the-art ASIC circuitry and surface mount technology for maximum reliability. Shipped with a protective dust cover.