Gentex S1209


Photoelectric Smoke Alarm, 120 VAC

Availability: In Stock

Condition: New
Brand: Gentex
Status: Active
SKU: 71553
Manufacturer Part #: S1209
Secondary Part #: 917-0059-002


The S1209 Series photoelectric smoke alarms are for use as an evacuation device in all dwelling units, including but not limited to homes, apartments, hospitals, hotels and motels. Available in two models, the S1209 Series is engineered to virtually eliminate nuisance alarms and deliver outstanding performance wherever reliable smoke detection is required. The S1209 Series is provided with a 9V alkaline battery for back-up in the event building power is lost. The battery drawer provides easy replacement without removing the unit from the wall or ceiling.

The Gentex S1209 Series is provided with a push button self-test and functionality test feature. The push button self-test verifies power operation and tests battery levels. The push and hold button functionality test analyzes the photoelectric sensing chamber for proper operation of smoke alarm. The self and functionality tests are in compliance with NFPA 72 and ANSI/UL Standards. Features of the smoke alarm series include DUALINK® tandem capabilities with Gentex tandem interconnect capable alarms products. Options include Form A/Form C dry contacts for remote annunciation.

Additional information

Weight 0.2 lbs
Dimensions 6.25 × 6.25 × 1.80 in







Detectable Medium


Detection Method


Production Status



  • 120 VAC with 9V battery back-up
  • Photoelectric smoke sensing technology
  • Horn frequency 3100 Hz (nominal)
  • Temporal 3 evacuation piezo horn
  • Nominal 2.5% sensitivity
  • Push button self-test feature, verifies power sources/operation
  • Push and hold button functional test feature, analyzes sensing chamber
  • Optional Auxiliary Form A/Form C relay contacts (F model)
  • Relay contacts operate when on battery back-up
  • Quick-disconnect wiring harness
  • DUALINK® – tandem with all Gentex tandem capable alarms
  • Non-latching (self-restoring) alarm
  • LED for AC power on
  • Red LED pulses every 30 seconds, green
  • Solid state red LED to indicate smoke presence
  • Smoke sensing chamber is fully insect screened
  • Mounting hardware adapts to standard junction boxes
  • Dust cover to prevent particle contamination during installation
  • Low or missing battery indicator


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Photoelectric Smoke Alarm; S1209 Series


Gentex - Data Sheet