Thermal limiter

Details Thermal limiter Thermal limiter

G - Physics

05

D

306/178, 309/86

G05D 23/27 (2006.01) H01H 37/38 (2006.01) H01H 37/48 (2006.01) H05B 3/74 (2006.01)

Patent

CA 1228104

: 10: ABSTRACT OF THE DISCLOSURE A thermal limiting devicefor controlling one or more sources of infra-red radiation, preferably tungsten-halogen lamps, mounted in heating apparatus, consists of a metallic wire arranged to de-energise the sources when it is subjected to a predetermined temperature. The wire is accommodated within a quartz tube, which selectively transmits and absorbs infra-red radiation of different wavelengths. An infra-red reflective coating is applied either to the wire or to the inner surface of the quartz tube to prevent infra-red radiation transmitted through the quartz tube from reaching the wire, whilst infra-red radiation of a particular wavelength, which is absorbed by the quartz tube, heats the wire by thermal conduction and convection, so that the limiter is primarily responsive to radiation only of that particular wavelength.

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