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A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors . PIR sensors are commonly used in security alarms and automatic lighting applications.
Occupancy sensor types include: PIR sensors, which work on heat difference detection, measuring infrared radiation.Inside the device is a pyroelectric sensor which can detect the sudden presence of objects (such as humans) who radiate a temperature different from the temperature of the background, such as the room temperature of a wall.
A passive infrared detector mounted on circuit board (right), along with photoresistive detector for visible light (left). This is the type most commonly encountered in household motion sensing devices and is designed to turn on a light only when motion is detected and when the surrounding environment is sufficiently dark.
The Wessex Saker Light Strike Vehicle was a British Army light vehicle similar to a sandrail. They were produced in the late 1980s for the British Special Air Service. Design was by Wessex and Devonport Management Limited. The frame was welded tube and power, to the rear wheels only, was from a Volkswagen 1.6 litre air-cooled petrol engine.
A pair of Royal Navy Wessex helicopters on the flight deck of HMS Intrepid, 1968. An improved variant, the Wessex HAS.3, succeeded the HAS.1 in the anti-submarine role; it had a more capable radar and better avionics, greater engine power, improved navigational features and a more advanced weapon system; the original HAS.1 were re-tasked for SAR duties. [5]
Piping and instrumentation diagram of pump with storage tank. Symbols according to EN ISO 10628 and EN 62424. A more complex example of a P&ID. A piping and instrumentation diagram (P&ID) is defined as follows: A diagram which shows the interconnection of process equipment and the instrumentation used to control the process.
This is a route-map template for the Wessex Main Line, a UK railway.. For a key to symbols, see {{railway line legend}}.; For information on using this template, see Template:Routemap.
The Wessex was certified as the only commercial aircraft to use L'Eree. Cobham's airline, Cobham Air Routes Ltd, used the following Wessex aircraft: G-EBXK – Westland serial number 1771, granted its certificate of airworthiness on 21 March 1929. Originally the prototype Westland IV and retained as a demonstrator, later converted to a Wessex ...