Patent ID: 7286309

Claim:
A method of making an infrared sight glass for attaching over an aperture of an enclosure of electrical equipment from the outside for thermographic inspection comprising the steps of: providing an infrared transmitting medium; positioning a double sided self-adhesive gasket between said infrared transmitting medium and a recessed portion of a frame to prevent unauthorized removal of said security cover; providing a tag shield having an aperture corresponding to and adjacent to said aperture of said enclosure, said tag shield being positioned between said enclosure and said frame; attaching a second gasket between said tag shield and a ring surface of said frame; attaching a third gasket between said tag shield and around the aperture of said enclosure; attaching said frame adjacent to said aperture on said enclosure of electrical equipment without accessing an inside of said enclosure; and providing a security cover to attach on an outer surface of said frame to prevent unauthorized removal of said security cover.