G - Physics – 01 – G
Patent
G - Physics
01
G
265/44
G01G 21/00 (2006.01) G01G 7/06 (2006.01) G01G 23/00 (2006.01)
Patent
CA 1299591
Abstract Of The Disclosure Variations in the relative humidity of the air present within a housing of a scale (10) particularly a high accuracy scale utilizing a capacitive transducer (16) mounted at the interior of the housing, are controlled by a combination of (i) a mechanical partial seal (34) of the housing which resists a flow of moisture (by diffusion and air flow) through the seal, and (ii) a supply (42) of a desiccant located within the housing which both absorbs and desorbs moisture from the air held within the housing. The partial seal (34) is preferably located at an opening (18) in the housing for a shaft (20) mounting a weighing pan (22) external to the housing. For low motion, a face seal of a few mils provides the appropriate flow resistance. For high motion or low capacity scales, the partial seal (34) is a radial seal formed by the shaft and a surrounding sleeve mounted with a small annular clearance is used. The desiccant (42) is preferably silica gel. The values for the flow resistance and desiccant supply for a given interior volume produce a very slow change in the relative humidity in the housing over time, typically several years. In use, the relative humidity within the housing varies within ?5% of a steady state value despite much larger variations in the temperature and humidity of the ambient air surrounding the housing.
604007
Riches Mckenzie & Herbert Llp
Setra Systems Inc.
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