Patent ID: 6938477

Claim:
A bi-colour water level gauge for use in determining the water level in a boiler steam drum, heater, or similar water/steam device characterized by: an electronic printed circuit board ( 10 ) containing an array of high-intensity narrow beam first colour and second colour light emitting diodes ( 19 ); said electronic printed circuit board ( 10 ) being mounted on an electronics divider board ( 11 ); a lens divider board ( 12 ) comprising a plurality of viewing ports, each of said ports containing means, such as a plano-convex lens ( 13 ), for focussing light originating from said light emitting diodes ( 19 ), said ports being equal in number to, and aligned with said light emitting diodes ( 19 ); a heat divider ( 26 ) for separating said printed circuit board ( 10 ) from exposure to high temperatures existing at an external housing; and a display means ( 15 ) onto which light originating from the light emitting diodes ( 19 ) is projected for inspection by an operator.