Key Features

  • Responds well to slow-burning, smouldering fires
  • Well-suited to bedrooms and escape routes
  • Unaffected by wind or atmospheric pressure
  • Flashing LED and magnet operated test switch options
  • Uses light sensing technology


The Apollo Series 65 Optical Smoke Detector uses light sensing technology to detect smoke entering its detection chamber. 

It is housed in a moulded, self-extinguishing white polycarbonate enclosure with wind-resistant smoke inlets. The sensing chambers design prevents penetration of ambient light and has an insect resistant cover.

In the detection chamber, an infrared LED is positioned at an obtuse angle to a photo-diode. The LED emits a burst of collimated light that, under normal conditions, does not reach the diode. When smoke enters the chamber, the light from the LED is scattered onto the photo-diode. When this happens, the detector verifies the alarm by emitting two more bursts of light. If the light is still scattered, an alarm is triggered.

An external LED turns red when the detector is in an alarm state.



Tech Specs

Sensor configurationHorizontal optical bench housing infra-red emitter and sensor, arranged radially to detect forward scattered light.
Materials housingPolycarbonate
Materials terminalsNickel plated stainless steel
Product length42mm
Product diameter100mm
Chamber typeChevron
Power-up surge current0.115mA
Supply voltage (Vmin-Vmax)9 to 33V dc
Alarm load420Ω in series with 2V drop
Humidity0% to 95% (no condensation or icing)
Operating temperature-20 to 60°C
Storage temperature-30 to 80°C



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Apollo Optical Smoke Detector

Series 65 Optical Smoke Detector

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