Alarm modification for meteorological instrument

Details Alarm modification for meteorological instrument Alarm modification for meteorological instrument

G - Physics

08

C

234/27, 340/136.

G08C 21/00 (2006.01)

Patent

CA 1156737

ALARM MODIFICATION FOR METEOROLOGICAL INSTRUMENT Abstract An alarm modification kit for adding an electrical alarm signal feature to a mechanical recording type meteorological in- strument. The kit includes a counterbalanced shutter arm adapted to be secured to the output shaft of the instrument which carries the recorder pen without disturbing the output shaft in its mount- ings. The free end of the shutter arm is T-shaped with a notch located centrally therein. A U-shaped photo source-sensor assem- bly is adjustably positioned astride the free end of the shutter arm so that the cross member of the arm moves transversely between the legs of the source-sensor, preventing generation of an elec- trical signal therefrom until the notch of the shutter arm is moved into alignment with the source-sensor.

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