Ionization - This is the most commonly available smoke alarm. This kind of technology detects fast burning, rapidly moving fires.
Photoelectric - Many smoke alarms also contain this kind of technology. These sensors detect slow, smoldering fires.
Dual-sensing - One alarm that contains both technologies of ionization and photoelectric.
BOTH KINDS OF FIRES CAN KILL YOU IF YOU DON’T ESCAPE IN TIME!
Most smoke alarms are battery operated. Many older alarms use 9 volt batteries. Even if a battery is hardwired in to the home’s electrical system, a battery is usually included as a “back-up” in case of power failure.
Some of the newer smoke alarms can use lithium batteries. While lithium batteries usually cost more, they last much longer - as much as five to seven years longer than a 9 volt battery.
Currently, smoke alarms are produced that use both ionization and photoelectric sensors. These “dual sensing” alarms offer better protection for your family. Several of the dual sensing models can also use long-life lithium batteries.
Using a dual sensing smoke alarm with a lithium battery offers the safest protection for you and your family.
Phoenix city ordinance G-5898-2014 specifies that a smoke alarm cannot remain in service longer than 10 years from the date of manufacture. Smoke alarms are permitted to be solely battery-operated in existing buildings where no construction is taking place, provided the smoke alarm is UL-listed with a sealed 10-year lithium battery.