In general, the ESL 711U photoelectric smoke detector is an interchangeable head and base detector with a light-scattering optical sensor. Also, a pulsed infrared LED light source and a high-speed photodiode sensing element are housed in an omnidirectional sensing chamber protected by an insect screen. The chamber is not affected by ambient light. Besides, the detector features a field-replaceable optical chamber to simplify cleaning. The 721UT photoelectric detector includes integrally fixed temperature heat detectors.
The ESL 711U smoke detector is suitable for use in commercial as well as industrial environments. If the detector drifts out of its UL Listed sensitivity range or fails internal diagnostics, the alarm LED flashes once a second to indicate trouble. This meets NFPA 72 field sensitivity testing requirements without the need for external meters.
Furthermore, applying a magnet near the detector’s integral reed switch activates a self-diagnostic routine that provides a visual indication of sensitivity level, or if service is require. Built-in drift compensation allows the detector to automatically adjust its sensitivity over time as it wbecomes dirty.
Features / Specifications
- Self-diagnostic capability continually
- Built-in drift compensation
- Field-replaceable optical chamber
- Low-profile design blends into the ceiling
- Advanced nuisance alarm immunity
- Operating temperature range: 32°F to 120°F (0°C to 49°C)