Nowadays, the need to use energy -saving technologies is an increasingly urgent issue. One way to reduce the cost of electrical consumption is the installation of motion sensors.
The use of traffic sensors is possible both in premises and on the street. Their main purpose is associated with the closure of the electric circuit when the infrared field is changed in the controlled zone.
Sensors used in everyday life are in a constant analysis of infrared radiation. The circuit closing occurs due to the signal coming from the Frell lens to the photocell at the moment when an object appears in the zone of “visibility” of the motion sensor, the temperature of which exceeds the temperature of the medium by 5 degrees.
Movement sensors are widespread if it is necessary to turn on the lighting of lighting and ventilation systems. Some models of sensors allow you to configure the frequency of their operation.
Criteria for choosing motion sensors.
Like any other electrical product, motion sensors have certain parameters affecting their applicability in certain conditions:
• Using conditions: internally room, room under a canopy, street.
The degree of protection and the installation method depend on this criterion. On the market you can find devices with the degree of protection from IP20 to IP55. By the method of fastening, built -in and hinged sensors are distinguished;
• power of electrical equipment.
It is one of the determining factors by which the motion sensor should be selected, since the power of the switched equipment consumption may differ several tens of times. Depending on the power that can vary from 200 W to several tens of kW, the dimensions of the device and the conditions of connection will change;
• Function of the time setup.
This ability is indispensable in conditions of large rooms, for example, warehouses where it is very important to have time to appear in the “visibility” zone of the sensor until the lighting is turned off;
• Local conditions.
It should be understood that the sensor analyzes only the “visible” zone. Various kinds of designs, including glass, located in the working area of the sensor, can reduce the effectiveness of its application;
• View angle.
There are two options: 1800, which are mounted on the walls, and 3600 installed on ceilings and canopies;
• ratio of active and passive zones.
This indicator determines the sensitivity of the sensor. For example, there are models that amenable to set up, in which the sensor will work when human breathing.
Source Homelife. SU.