Measuring instrument for determining the alcohol content of...

Details Measuring instrument for determining the alcohol content of... Measuring instrument for determining the alcohol content of...

G - Physics

01

N

G01N 27/22 (2006.01) F02D 19/08 (2006.01) G01R 27/26 (2006.01)

Patent

CA 2096332

Abstract A measuring instrument has a measuring arrange- ment and a measuring circuit (1). The measuring cir- cuit (1) determines the capacitance of a capacitor (Cp) and the conductance (Rp) of the measuring arrangement, which is formed from a casing and a sensor element around which a mixture flows. The alcohol content of the mixture is determined therefrom. The measuring circuit (1) has an oscillator (20) and a control circuit (30) connected upstream thereof. The measuring arrangement, which is represented by the capacitor (Cp) and the conduct- ance (Rp), is a part of the oscillator (20), which oscil- lates within a measuring cycle at three different oscil- lator frequencies which are set by three different control voltages of the control circuit (30), and evalu- ated in a microcontroller. Component tolerances which influence the oscillator frequencies can thus be taken into account. Figure 2

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