Most recently, sensors that react to human movement, is considered a rare thing, and used only for special purposes (most often - to protect perimeter). Today, these sensitive devices are widely used in a domestic environment, making human life more comfortable. They help enable and disable the light in doorways, toilets and other public places. In addition to the convenience of using these modern devices allow you to save on electricity.
types of sensors
In the domestic market there are many fine examples of motion sensors that allow you to control the lighting switched networks remotely. All of these models are classified according to two main features, one of which is associated with the mounting means, and the second - the physical principle of detection of movement of the object.
In accordance with the first of these indicators of the sensors are divided into two types:
- Wall (they - ceiling or overhead).
- Built-in appliances.
The first samples of sensors equipped universal type pivot brackets with which they can be mounted on any flat surface (pictured below).
They are installed at a height of about 2.5 meters from the floor level and may be arbitrarily oriented in space.
Built-in products installed in a prepared niche or electrical box, so that their front part is flush with the wall plane. They are usually installed close to the switch with the luminaire or mounted in a special niche (photo below).
By the principle of operation of the sensor element sensors are divided into the following types:
- Infrared.
- Ultrasonic.
- Acoustic.
- Microwave.
First on the list of the device is completely safe for humans. It reacts to the heat radiation of biological organisms and is set in a residential area. Ultrasonic transducer operates at frequencies inaccessible to human and has a limited range.
note: It should not be installed in homes with pets.
Acoustic devices react to the noise produced by man and are most often used in a limited amount of rooms (toilets, for example). The last type of sensor demand in the security systems of collective purpose.
selection rule
When selecting a sensor special attention is drawn to it, with a specific purpose it is supposed to use. If it is intended to control light only - the requirements of the different requirements than to the device alarm system.
The motion detector is selected by matching following operating parameters:
- The required sensitivity.
- Acceptable angle control zone.
- Its length.
- Apparent speed moving object.
Quality products equipped with controllers, allows you to set the illumination delay time and sensitivity of the device (pictured below).
The angle of the control zone is usually selected in the range of 90 to 120 degrees, and its length can be up to 10-15 meters. Typical devices are configured to move an object with a speed of 0.1 meters per second, so that the artificial slowing he did not react.
