Types of smoke alarms
There are two main types of smoke alarm for home use: ionisation and photoelectric alarms.
These contain a very small amount of radioactive material, which reacts to particles emitted in a fire and sets off the alarm. Ionisation alarms are best at detecting fast-flaming fires that don't emit much visible smoke. But many house fires tend to be smoky and smouldering long before they flare into flame, and ionisation alarms aren't as quick at detecting these. They can also be prone to nuisance alarms from cooking and steam, so shouldn't be located near your kitchen or bathroom.
These contain a photo cell and a light beam shining away from the cell. When smoke enters the test chamber, some of the light is scattered by the smoke particles and hits the cell, triggering the alarm. Photoelectric alarms are best at detecting smoky and smouldering fires, which is a common type of house fire. Dust or insects entering the unit can cause false alarms, so they have to be cleaned occasionally.
- $50.47Trader Gsm Bear Photoelectric Smoke Alarm 240V~ AC - BESMOKEY
Photoelectric Smoke Alarm Surface Mount 240V AC 9V Battery Back Up Single or InterconnectableLearn More
- $42.00Cavius Thermal Heat Alarm Sensor Detector - Worlds Smallest 10 YEAR Battery
Cavius Thermal Heat Alarm Sensor Detector - Worlds Smallest 10 YEAR BatteryLearn More
- $42.00Clipsal PhotoElectric Smoke Detector Alarm Fire 755PSMA4 Photo Electric 240v
The 755PSMA4 smoke alarm is a photoelectric smoke alarm that can be used as a single mains powered, battery backed alarm or can be interconnected with other 755 series smoke alarms to give whole home protection. It is designed to be surface mounted on the ceiling.Learn More
- $49.00Cavius Photoelectric Smoke Alarm Worlds Smallest - 10 YEAR BatteryThe Cavius photoelectric smoke alarm combines state of the art electronics and superior product design.The aesthetically pleasing Cavius photoelectric smoke detector has a 10 year long life battery included, a penetrating sound at 85db(A) siren at 3 metres.Learn More