Passive Infrared
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Passive Infrared Motion Detectors Functional principles Passive Infrared Sensors PIR function in a similar way to infrared cameras which are used, for example, in familiar applications such as detecting heat loss from buildings. The infrared-sensitive sensor forms a heat image of the defined area to be monitored using a multiple-lens system (Fresnel lenses). After an initial transient of approximately 20 sec., the measured infrared image is saved. The sensor switches if the heat image changes as a result of movement. Two conditions must be fulfilled here: 1. There must be a temperature difference of +/– 2° C between the object to be detected and the background and 2. the object to be detected must move at a rate of at least 10 cm/s. Ideal temperature source Extremely long processes such as the rise in temperature as a result of exposure to sunlight, the heating up of radiators, changes in weather conditions brought about by clouds are not detected. Detecting people and objects For reasons of a physical nature, PIR technolgy should only be used to detect living things as it is not always possible to guarantee that the difference in temperature between shopping trolleys, vehicles etc. and the surrounding environment will be great enough. These objects may, therefore, in certain cases not be detected. We recommend our Radar Motion Detectors for detecting both people and objects such as shopping trolleys and vehicles. Possible temperature source The Reglomat built-in units PIR 20, PIR 30 and PIR Master are equipped with 12 (PIR 20) or 18 Fresnel lenses. These enable the detection area to be set very accurately by means of an internal mechanical system or diaphragms and zoom technique (patent pending). Precise and custom-built – just like an invisible contact carpet. Beam geometry Important: when the object penetrates the beams, it must be detected by at least one of them. Ideal for detecting people There is always a difference of at least 10° C between the surface temperature of a clothed person and the surrounding environment. All types of installation possible Intelligent and temperature-compensated Reglomat PIR operate with common-mode rejection which guarantees dynamic response. New: an integrated temperature sensor optimises the control loop of the amplifier as a function of the ambient temperature. Our product range also includes PIR devices for building services managment systems. Ask for our “Special package for electricians” documentation for 220 V devices with photo-electric lighting controllers, gong controllers and intruder detection systems. Typical applications Door/gate Small, powerful and reasonably-priced opening pulse detectors for all systems which open automatically. Particularly suitable for integrated installation. Elevators For monitoring the area in front of the elevator and whether or not the elevator is occupied. High-precision Reglomat lenses Close collaboration with our customers has always been one of our top priorities. This is why all PIR and Radar Motion Detectors have identical mounting brackets, mounting boxes for ceiling installation and protection class IP 65 as well as machting weather shields for installation outdoors or to provide protection against vandalism. All of these enable problem-free handling and considerably simplify the logistics of the detectors. Train/bus/trolley-bus For monitoring the entire boarding area of vehicles with doors that close automatically. Building services management systems Special sensors which are used as presence detectors for lighting, air conditioning, heating, telephone booths, small conference rooms and cashpoint areas etc. Sensors for open entrances, gong, call, video. The area in front of the entrace is monitored – entry is not possible without the gong sounding.