H - Electricity – 01 – L
Patent
H - Electricity
01
L
H01L 31/04 (2006.01) A61L 2/10 (2006.01) A61L 2/26 (2006.01) G01J 1/42 (2006.01) G01J 1/58 (2006.01) H01L 31/02 (2006.01)
Patent
CA 2083887
Abstract The present invention provides a novel submersible photocell for detecting ultraviolet light in disinfection apparatus. The photocell includes a quartz jacket capable of transmitting ultraviolet light and a fluorescent material sensitive to ultraviolet light at a wavelength of about 253.7nm and which produces an infrared secondary emission having a wavelength of about 730-735nm upon absorption of ultraviolet light. The photocell also includes a photoconductor sensitive to the secondary emission light, is located adjacent the fluorescent material and is capable of varying conductance of electricity upon absorbing light having a wavelength of about 730-735nm from the infrared secondary emission. The photocell further includes electrically conductive wiring connected to the photoconductor and extending outwardly of the jacket at its remote end. Also, the photocell includes a silicone sponge filler positioned adjacent the photoconductor and around the wiring, together with a nonreactive, non-outgassing ultraviolet light resistant potting compound located adjacent the filler and surrounding the wire to tightly seal the remote end of the jacket from liquids. The present invention also provides a quick attach clamp for positioning the photocell at a predetermined distance from an elongated ultraviolet light source and in a desired alignment configuration. The clamp includes a sleeve for housing a portion of the photocell and a potting compound surrounding the portion of the photocell within the sleeve. An epoxy resin plug at the end of -20- the sleeve seals the remote end of the sleeve. A cover is connected to the detection end of the sleeve and has an access opening to the detection end of the photocell. Spaced apart, opposed arms extend from the cover in a direction substantially parallel to an axis running through the center of the opening. Each arm has a portion sized and shaped to firmly grip the outer surface of elongated ultraviolet lamps so that the detection end of the photocell is positioned at a constant, predetermined distance from the light source in a direction substantially perpendicular to the axis running through the center of the access opening. -21-
Kallio James
Schuerch Peter
Weltz Richard K.
Goudreau Gage Dubuc
Infilco Degremont Inc.
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