Breath alcohol analyzer using a biosensor

Claim 1

A breath alcohol analyzer for measuring alcohol concentration comprises: a biosensor for reacting with a vapor-phase alcohol gas, the biosensor including: an insulating substrate, an amperometric device formed on the insulation substrate and having a plurality of conductive lines and connective pads and a plurality of electrodes, an enzyme immobilized layer formed on one of the plurality of electrodes of the amperometric device, an outer membrane formed on the substrate having the plurality of electrodes for forming an electrode system, and an insulating membrane formed on said substrate except on the outer membrane; a sensor and amplifying circuit for sensing current generated from the reaction of the biosensor with the alcohol gas and amplifying the current; an analog-to-digital converter for converting a signal output from said sensor and amplifying circuit to a digital signal; a microprocessor for processing said digital signal output from said analog-to-digital converter and determining a drinking degree corresponding to the digital signal, the microprocessor outputting a signal indicating the drinking degree; and a display for receiving the signal output from the microprocessor and displaying the drinking degree.