Digital burette and method for displaying the dose volume in said digital burette
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United States of America Patent
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Jul 17, 2007
Grant Date -
Mar 25, 2004
app pub date -
Jan 10, 2002
filing date -
Feb 13, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to a digital burette having a manual drive for suctioning and applying an adjustable dose volume, a gear unit connected downstream and a digital display device controlled thereby for setting the dose volume. The control comprises an incremental encoder which is functionally connected to the gear unit, at least one sensor for detecting the signals produced by the incremental encoder and a processor connected to the sensor and the display device for calculating the dose volume corresponding to the number of signals. The incremental encoder is, in particular, a sector disc with two groups of sectors of different magnetic field strength disposed alternately in the peripheral direction of the sector disc. A sensor detects the number of turns of the sector disc. To save energy, the power supply of the burette is ensured by a solar cell and two spaced sensors are provided for detecting the number of turns of the sector disc to reduce the clock frequency of the processor for a same measuring accuracy. The invention also relates to a method for displaying the dose volume of such a digital burette.
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