Ref: W-Solar Alarm PIR This quality battery powered internal
PIR (passive infrared detector) works in conjunction with our Wireless Solar Alarm and has built in Pet Immunity Technology.
This
Sophisticated PIR will not detect animals weighing under 25kgs which makes them ideal for homes with small animals or outdoor buildings such as garages, barns etc.
A total of 15 Detectors or Remote Controls can be used with the Solar Powered Alarm System.
Specification:Size; 95 (H) x 60 (W) x 90 (deep including bracket) mm.
Frequency: 868 Mhz.
Detection Range: 9 metres distance & 90 degrees angle.
Transmission Distance: 100 metres (line of sight).
Pet Immunity: under 25kgs.
Power Supply: 3v Lithium Battery (CR123A).
Operating Temperature: -10 to +50 Celcious.
Colour: White.
Battery Life: 1 - 2 years.
Internal Dip Switch Functions:1 - Pulse.
2 - Pulse.
3 - Pulse.
Test Mode & Normal Power Saving Mode.
How PIR's Work (passive infrared detector):All PIR sensors detect changes in infra-red radiation, in the form of heat emitted by a number of bodies including people, cars and to a lesser extent, dogs or other small animals. The bigger the body, the more infra-red radiation isemitted and the easier it is for a PIR sensor to detect.
The field of view is the area in which changes in infra-red radiation can be detected. The field of view can alter with changes in temperature and the size of the heat source.
The construction of the PIR and Fresnel Lens divide the field of view into a number of zones both vertically and horizontally.
Multi Element Fresnel Lens:The lens focuses the infr-red radiation given out by a hear source on to the Pyroelectric sensor. The different elements or facets of the lens divide the incoming infra-red radiation into vertical and horizontal zones.
Pyroelectric Passive Infra-Red Sensor:The dual element Pyroelectric sensor receives the incoming infra-red radiation from various zones. The two elements of the sensor receive varying amounts of infra-red radiation and this difference is amplified, turning into a signal via the IC. This signal activates the microcontroller. The sensor detects infra-red radiation in the wave length from 8 - 9 metres.
Intergrated Circuit Control Chip (IC):This is a customised chip which controls the various modes of operation, timing functions and the processing of the signal from the sensor to drive wireless alarm signals to alarm panel.
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