There are a variety of smoke detectors available on the market, let’s take a look at the most common types we use in a fire alarm system installation:
Ionisation alarms are the most common type of fire sensor. They use a small radioactive source to generate a current. When smoke is present this causes the current inside the unit to change, sounding the alarm. Their sensitivity doesn’t make them suitable for kitchens.
Optical alarms use infrared beams to detect smoke. They’re more expensive than ionisation alarms but can be used in most of the house.
Combination smoke detectors use one of the methods above with a heat sensor. The information is taken from both sources then combined using a complex algorithm to compute if fire has been detected.