Measuring instrument and method for determining the alcohol cont

Details Measuring instrument and method for determining the alcohol cont Measuring instrument and method for determining the alcohol cont

1993-05-12

1994-11-22

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324663, 324686, 73 6143, G01R 2726, G01R 2722, G01N 2710, G01N 2722

Patent

active

053672640

ABSTRACT:
A measuring instrument has a measuring configuration and a measuring circuit. The measuring circuit determines the capacitance of a capacitor and the conductance of the measuring configuration, which is formed of a casing and a sensor element around which a mixture flows. The alcohol content of the mixture is determined therefrom. The measuring circuit has an oscillator and a control circuit connected upstream thereof. The measuring configuration, which is represented by the capacitor and the conductance, is a part of the oscillator, which oscillates within a measuring cycle at three different oscillator frequencies which are set by three different control voltages of the control circuit, and evaluated in a microcontroller. Component tolerances which influence the oscillator frequencies can thus be taken into account.

REFERENCES:
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patent: 5134381 (1992-07-01), Schmitz et al.
patent: 5182523 (1993-01-01), Ertel et al.
patent: 5261270 (1993-11-01), Gonze et al.

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