They contain an infra-red LED which, every few seconds, pulses a beam of light into the sensor chamber to check for smoke particles.Īs smoke enters, the infrared light is scattered onto the photodiode light receptor, triggering an alarm. Optical (or photoelectric) alarms are light sensors. Pros: Can suit dustier areas, such as lofts, the area near your bathroom or rooms where people smoke.Ĭons: They shouldn’t be placed too near to kitchens because of false alarms. These alarms are more sensitive to smaller particles of smoke produced by the flaming stage of fires than optical alarms, and more easily triggered by cooking – causing false alarms. When this happens a signal is sent to the integrated circuit and the alarm sounds. Smoke particles change the balance of the current. These are positively and negatively charged, creating a small current inside the chamber. Ionisation alarms ionise the air between two electrodes. What's the best type of smoke alarm for my home? Ionisation smoke alarms In our reviews of interlinked alarms, we note which smoke alarms will work with which heat alarms. When buying interlinked smoke and heat alarms, look for deals on packs of alarms, including two or three smoke alarms and a heat alarm as this will help to keep costs down when upgrading the alarms in your home. Now that the alarms law has changed in Scotland, you'll need to install interlinked heat and smoke alarms in your home.Īll of the major manufacturers (Aico, FireAngel and Kidde) make smoke and heat alarms that will work in combination with one another and we have tested pairs of smoke and heat alarms from each of them. What kind of smoke alarms and heat alarms will I need in Scotland now that the law has changed?
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