Installing a dual sensor smoke alarm is one way to be sure that no type of fire goes unnoticed in your home. Whereas most smoke alarms possess a single photoelectric or ionization sensor, dual sensor smoke alarms feature both types. Photoelectric sensors are more likely to detect thick, visible smoke particles such as from a burning mattress, while ionization sensors are capable of detecting nearly invisible particles when less smoke is present.
Smoke Alarm Specifications
Dual sensor smoke alarms are often rated for both residential and commercial use. Battery-powered models can install anywhere and can run off of long-life, lithium 9-volt batteries. Plug-in, AC-powered and hardwired smoke alarms possess a backup battery in case the power should go out. Smoke alarms are equipped with a test/reset button, allowing you to periodically check the operation and battery level of the unit. In addition, the smoke alarm may feature a flashing LED to indicate operational ability, while a continual chirp is emitted when the battery needs replacing.
Combination Smoke Alarms
Another type of dual sensor smoke alarm combines a smoke detector with a carbon monoxide detector, providing an additional level of safety for your home. Essential for homes with a natural gas line, combination alarms include an electrochemical sensor to pick up present CO levels, as well as the smoke sensor.