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Aviation History
1951
1951 - 1832.PDF
PTIMBER 1951 FLIGHT 1AVINER MAGNETIC FIRE DETECTOR (RESETTING TYPE) THE COMPLETE SYSTEM CO M P RIS E S'T """""" TECTOR- weight only 2\ ozs-A WARNING LAMP & BATTERY line operation of the Graviner Magnetic Fire )etector is based on the Curie point principle vhereby certain metals lose their magnetic properties on reaching certain temperatures. The adoption of this principle in fire detection |s primarily advantageous in that no relays or live amplifiers are required. The alloy of the temperature sensing element governs the operating temperature and this figure cannot alter in service. The detector is robust, her- metically sealed, unaffected by "g" or vibration and can be installed in fire zones with ambient air temperatures as high as 290°C. Detection time in standard flame under two seconds. ^ In the left illustration the top magnet on the beam assembly is attracted to the Curie cap, but its attrac- tion ceases when a pre-determined temperature is reached, and the two bottom magnets swing the beam assembly to the position shown in the right hand illustration, completing an electrical circuit. When the temperature of the sensing element is reduced, the magnetic attraction between the Curie cap and the top magnet is restored, the beam is swung to its original position and the circuit is broken. Visit our STAND No. 146 at the S.B.A.C. Exhibition, Farnborough GRAVINER >"HE GRAYINER MANUFACTURING CO. LTD., POYLE MILL WORKS, COLNBROOK, BUCKS. Tel: Colnbrook 48 Agents in: Argentina, Austialia, Canada, Denmark, East Africa, Holland, India & Pakistan, Italy, New Zealand, Sweden, U.S.A. G.R.6
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