The enzyme reactor is required for measuring methanol and ethanol. Inside the reactor is the immobilized enzyme alcohol oxidase (AOD). There, the corresponding alcohol is converted and hydrogen peroxide is formed. The hydrogen peroxide is then detected in the conductivity cell. Analysis in the BioPAT® Trace | Multi Trace is a combination of enzymatic conversion and electrochemical detection. A 2-channel enzyme electrode coated with oxidase or a combination of an enzyme reactor with a platinum electrode (methanol|ethanol application) serves as the biosensor. Depending on the application, the service life of the sensor system ensures 30 days or 5,000 measurements. In the “Methanol | Ethanol” operating mode, an enzyme reactor with immobilized alcohol oxidase is required for the enzymatic conversion of analytes.