Method and device for measuring the quantity of an active principle contained in a reservoir
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United States of America Patent
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Mar 30, 1999
Grant Date -
N/A
app pub date -
Oct 31, 1996
filing date -
May 6, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A solution of active principle, in ionized form, impregnates a layer (2) forming part of the reservoir (1). A measurement of the quantity of active principle contained in this layer is derived from a measurement of the conductivity of this layer. The measurement device comprises a) first (7) and second (10) electrodes placed on either side of and in electrical contact with at least a part of the layer (2) of the impregnated material of the reservoir, b) means (5) for passing the electric current of predetermined strength through the impregnated material and c) means (6) sensitive to the voltage (V) picked up between the electrodes (7, 10) in order to calculate the quantity of active principle contained in the reservoir.
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