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Due to Component and Supply Shortages World Wide Due to Component and Supply Shortages World Wide
Gentex 7139CS-C, 120V AC P/E Smoke with Strobe & Temporal 3 Sounder, Contacts, 9V Backup, Ceiling
Gentex 7139CS-C, 120V AC P/E Smoke with Strobe & Temporal 3 Sounder, Contacts, 9V Backup, Ceiling

Gentex 7139CS-C, 120V AC P/E Smoke with Strobe & Temporal 3 Sounder, Contacts, 9V Backup, Ceiling

Manufacturer Part#:917-0020-002
Our Part#:917-0020-002
Stock Status: Call for Availability
Retail Price:$187.26
Your Savings:$55.39(30%)
Your Price:$131.87









Feature 5


Feature 7

Product Type:Smoke Detector|Input Voltage:120VAC|Detection Type:Photoelectric|Connection Type:Hardwired|Intended Use:Residential,Commercial|Battery Backup:Yes|Interconnect:Yes
All Gentex items will ship directly to our warehouse and then to the customer causing extended lead time


  • 177 candela rating (UL 1971)
  • Solid-state, non-latching 90 dB Horn
  • Patented, three-position test switch
  • 9 VDC battery backup (7109CS & 7109LS) w/audible low battery chirp
  • Nominal 2.5% sensitivity
  • 5:1 signal-to-noise ratio
  • Pulsing LED sensing chamber
  • Fully insect screened
  • Solid State LED condition indicator
  • Form "C" auxiliary relay contacts for remote annunciation (CS models)
  • Tandem connection up to 6 detectors per system (CS models)
  • 9 Foot linecord (LS models)
  • Mounting hardware adapts to standard junction boxes
  • On-site maintenance washing program
  • Temporal 3 Evacuation Sounding Device (713/7139)


The 710/713CS/LS and 7109/7139CS/LS photoelectric single/multiplestation smoke alarms are designed to give reliable early warning of the presence of smoke where both audible and visual alarms are required. The series features a 90dBA solid state piezo signal and a 177 Candela strobe with “FIRE” lettering. The strobe is listed per UL 1971.

The smoke alarm operates on the light scattering principle, a superior method of detection in smoldering fires, utilizing a pulsing LED lightsource and a photo diode sensor in a fully screened sensing chamber.

Every 4 to 5 seconds the pulsing LED emits an infrared beam that bypasses the photo diode under normal conditions. However, when smoke enters the sensing chamber, the infrared beam is deflected onto the sensor by the smoke particles. The LED pulse rate increases to 8 times the normal rate, and after the photo diode confirms that smoke is present for 2 consecutive pulses, it will produce the signal necessary to trip an alarm.

Upon activation, the alarm will emit a 90dBA local audible signal and activate the high intensity strobe. During the alarm period the strobe will flash at a brightness of 177 candela 60 times per minute. After the smoke has cleared from the detector, the unit will revert to the normal stand-by condition.

Electrical Specifications

Operating Voltage 120 VAC, 60Hz
Operating Current 0.400 amps (Peak)
Operating Ambient Temp Range 40F to 100F
Alarm Horn Rating

90 dB at 10 ft

Nominal Sensitivity 2.5% Obscuration
Auxiliary Relay (Standard) 1 Form C (0.6 amp) (710/713CS and 7109/7139CS)
Size 5.5" Square x 4.75" Overall Depth
Secondary Power Source Alkaline 9VDC Battery (Supplied) - 7109CS/LS and 7138CS/LS

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