Measuring apparatus

Details Measuring apparatus Measuring apparatus

G - Physics

08

B

116/66, 340/136.

G08B 5/00 (2006.01) G01D 13/26 (2006.01) G01P 1/11 (2006.01)

Patent

CA 1206043

ABSTRACT OF THE DISCLOSURE A measuring apparatus in the form of a pressure gauge includes a pointer movable over a dial. An adjustable set point forms part of an arm which can move around the dial and carry with it a plastics housing in which are mounted an infra- red emitting diode and a silicon photodarlington transistor. The pointer has an end portion which reflects the infra-red radiation from the diode to the transistor when the pointer is in alignment with the set point. The set point is movable around the dial by means of a friction roller which engages the periphery of an annular disc attached to the arm.

447848

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