Initially, motion sensors have been designed only for use in intruder alarm systems. They reacted to the emergence in the protected zone of the moving object and transmit an alarm signal to a special control panel. But manufacturers have gone further and developed a model that can include spotlights, sirens, street lighting, additional signaling and power supplies.
To date, motion sensors to turn lights are available in two types – this ceiling and wall. Although the principle of operation they have the same, but they are selected individually, depending on the installation location.
When choosing the most important motion sensors to understand how and how they work.
Principle of operation of their simple – upon entering the protected area of a moving object, the sensor goes into alarm mode and its relay contact collects the electrical circuit, which included load, such as an incandescent lamp.
In wall sensors wider scope. They are installed in the indoor and outdoor. They, as well as the ceiling, creating multipath barrier crossing which sensor goes into alarm mode and its relay contact closes the circuit.