Photoelectric smoke detectors therefore use light in a different way. Inside the smoke detector there is a light and a sensor, but they are positioned at 90-degree angles to one another. In the normal case, the light from the light source shoots straight across and misses the sensor. When smoke enters the chamber, however, the smoke particles scatter the light and some amount of light hits the sensor. This will cause the alarm to go off.

Ionization smoke detectors use an ionization chamber and a source of ionizing radiation to detect smoke. This type of smoke detector is more common because it is inexpensive and better at detecting the smaller amounts of smoke produced by flaming fires. Smoke detectors can run off of a 9-volt battery or 120-volt house current.

You probably already have a battery-operated smoke detector. Do you need one installed as part of my security system?  Smoke detectors are highly effective in preventing loss of life and property. However, there are differences between the “stand alone” or battery-operated smoke detector you would buy at your local hardware store and one installed as part of your home security system.  “Stand alone” detectors are not connected to other detectors or warning devices. A smoke detector connected to your security system offers more protection when it is monitored by a central station. If fire strikes, the detector sets off an alarm and sends a signal to the control panel. The control panel dials the central station, where the operator notifies the fire department. Only central station monitored smoke detectors provide automatic notification of authorities when you or your family are asleep, not at home or unable to get to the phone. Protect your pets too from fire while you’re at work!

The 7497R HARDWIRED SMOKE & HEAT SENSOR comes with 2 sensors to provide triple the protection against fire and with its small size, it can be placed anywhere.

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1. Why Are Smoke Detectors Important?
2. Motion sensors for home security systems
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