Laboratory fume hood control apparatus having rotary sash door position sensor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Mar 19, 2002
Grant Date -
N/A
app pub date -
Apr 17, 2000
filing date -
Apr 17, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fume hood control apparatus for controlling the flow of air through the fume hood in a manner whereby the effective size of the total opening to the fume hood, including the portion of the opening that is not covered by one or more sash doors will have a relatively constant average face velocity of air moving into the fume hood. The apparatus includes a simple and reliable sash door sensing means for sensing the position of the moveable sash door by using a rotary position sensor with a lever arm mechanism which translates horizontal or vertical movement to rotary movement for determining the position of the sash door. The apparatus compensates for nonlinearity that result from the translation.
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