80 metre DA-XL Twin PIR Wireless Driveway Alarm System

Descripción

80 metre DA-XL Twin PIR Wireless Driveway Alarm System Wireless 80 metre Driveway Alarm & Alarm System comprising of a 2 x External Wireless PIR's & 1 x 4-Channel Wireless Receiver. Kit Includes: 2 x PIR's & Batteries. 2 x Rubber Hood's 2 x Adjustable PIR Brackets 1 x Set of Instructions 1 x XL Receiver 1 x12v Transformer Specifications: Receiver Size: 125 (w) x 90 (H) x 30 (D) mm Operating frequency: 433Mhz. Back Up Batteries: 4 x AAA (not included). Powered Supply: 1 x Plug in 12v DC Transformer (included). Wireless Working Range: 80 metres (line of sight). PIR's Dimensions: 90 (H) x 45 (W) x 65 (D) mm. Weight: 60g. Power Supply: 1 x 9v PP3 battery. Working Frequency: 433Mhz. Working Radio range: 80 metres (line of sight). PIR Operation PIR (passive infra-red 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 is omitted and the easier it is for a PIR sensor to detect. If you imagine the images shown on television of a Police Helicopter following a suspect in the pitch black using night vision technology or a Soldier looking through night vision binoculars in the middle of the night, this is exactly how the PIR is working. There are two ways of fitting the PIR (the PIR is supplied with an easy to fit adjustable mounting bracket): 1 - 1.5 metres from the ground, pointing horizontally across the ground (this is the most efficient way to avoid false alarms from small animals). High up pointing down towards the ground, but you will need to experiment with the angle to avoid detection of the ground.