Apparatus for dispensing very small quantities of liquid
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United States of America Patent
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-
Nov 20, 1984
Grant Date -
N/A
app pub date -
Jul 30, 1982
filing date -
Oct 12, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus for the dispensing of very small amounts of liquid includes a measuring vessel which can be filled with an amount of liquid, and to whose outlet there is connected an ejector of a partial quantity. A sensor responds to the liquid level in the measuring vessel, to control a filling system which receives therefrom a signal for the filling of the measuring vessel when the minimum permissible lower liquid level is reached and a signal for the ending of the filling process when the maximum permissible upper liquid level is reached. The sensor is a capacitor which extends at least over the entire range of the variable liquid level in the measuring vessel and whose dielectric is the liquid situated in the measuring vessel. A capacitance meter is provided for measuring the capacitance of the capacitor.
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