Kidde Fenwal Smoke Detectors

The 700 Series conventional photoelectric smoke detector is an interchangeable head and base detector with a lightscattering optical sensor that provides outstanding stability and excellent response to a wide range of fires.

Model 721UT photoelectric detectors include integral fixed temperature and rate-of-rise heat detectors. The 721UT provides remote alarm and trouble LED driver outputs.

The 700 Series smoke detectors were the industry's first conventional self-diagnostic detectors specifically designed for the demands of commercial and 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 a trouble condition. This meets NFPA 72 field sensitivity testing requirements without the need for external meters.

Additional diagnostic information is activated by applying a magnet near the detector's integral reed switch. This initiates a self-diagnostic routine and provides visual indication of sensitivity level, or if service is required. The magnet test causes the LED to blink. The number of blink counts corresponds to a smoke detector sensitivity range. And, if they become dirty over time, the 700 Series detectors automatically adjust the alarm threshold through builtin drift compensation. If the detector ever does need to be cleaned, the patented field replaceable optical chamber makes cleaning a snap.


  • Self-diagnostic capability continually monitors operation
  • Head and terminal base design (base sold separately)
  • Low-profile design blends into the ceiling
  • Advanced alarm verification feature reduces chance of nuisance alarms
  • Compatible with most Kidde, Fenwal and Chemetron Conventional Control Panels

Technical Specifications

  • Meets NFPA 72 sensitivity test requirements
  • Automatic drift compensation
  • Normal sensing occurs every 9 seconds.
  • Optical sensing chamber is field replaceable, allowing quick and easy cleaning and maintenance.
Listing & Approvals
  • FM Approved
  • UL Listed
  • CSFM Approved