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How Do Smoke Alarms Work? An Overview of Smoke Alarm Sensors

Smoke alarms are available with many types of sensor, each one detecting smoke or fire using a different method. This guide is designed to help highlight the differences between each sensor type, show how each sensor works, show the advantages and disadvantages of each sensor type and also highlight where each type of sensor is best suited throughout your home.

How Heat Alarms Work

More info about How Heat Alarms Work Heat alarms are ideal for smokey and dusty environments, they react to heat instead of smoke so are less likely to give false alarms.

How Ionisation Smoke Alarms Work

How Ionisation Smoke Alarms Work Ionisation smoke alarms react quickly to fast flaming fires by detecting the change in ionised properties of air through smoke.

How Optical Smoke Alarms Work

How Optical Smoke Alarms Work Optical smoke alarms are particularly good at detecting slow smouldering fires such as soft furnishings or electrical wiring.

Benefits of Combined Sensor Alarms

What are the Benefits of Combined Sensor Alarms Combined alarms with multiple sensors contain two separate sensing elements - optical and heat allowing them to monitor two different by-products of fire


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