Ultraviolet sensitive flame detector in cooled housing

Claim 1

A FLAME DETECTOR COMPRISING A HOUSING INCLUDING AN OPEN END; A FRONT PIECE PARTLY CLOSING SAID OPEN END, SAID PIECE COMPRISING A FRONT FACE INCLUDING APERTURE MEANS DISPOSED AXIALLY RELATIVE THE AXIS OF THE HOUSING, A PLURALITY OF PASSAGEWAYS SPACED PERIPHERALLY FROM SAID APERTURE MEANS IN SAID FRONT FACE; AN ULTRAVIOLET SENSING ELEMENT WITHIN THE TUBE; MEANS POSITIONING THE SENSING ELEMENT AXIALLY WITHIN THE TUBE IN LINE WITH THE APERTURE MEANS CLOSE TO BUT SPACED FROM SAID FRONT FACE; SOURCE MEANS TO FLOW A COOLING FLUID IN SAID HOUSING THROUGH SAID PASSAGEWAYS; AN INSERT WITHIN SAID HOUSING ENCOMPASSING SAID SENSING ELEMENT, THE INSERT COMPRISING AN OPENING AXIALLY DISPOSED BETWEEN THE SENSING ELEMENT AND SAID FRONT FACE, AN INSIDE SURFACE APPROXIMATELY PARALLELING THE SURFACE OF SAID SENSING ELEMENT TO DIRECT A UNIFORM FLOW OF COOLING FLUID OVER THE SURFACE OF SAID SENSING ELEMENT, AND OUTWARDLY TO SAID PASSAGEWAYS; THE INSERT BEING OF A HEAT RESISTANT NON-HEAT TRANSMITTING NON-METALLIC MATERIAL.