arrangement for determining the blood alcohol content by analyzing the alkoholkonzentration in alveolarer exspirationsluft

摘要

1. A method of determining blood alcohol concentration by analysis of the breath alcohol concentration (AAK) in the volume of breath expired, wherein the values obtained by measuring the variation per unit time of the alcohol concentration in the breath are compared with a threshold value, characterised in that the increase in the expired concentration S(t) is calculated from the measured alcohol concentration in the breath (AAK) and the measured volume (V) expired per unit time according to the formula S(t) = d AAK(t)/d V(t).V(t)/AAK(t) and the measured values are only then called upon for further evaluation when S(t) lies between a given positive threshold value S+ and a given negative threshold value S-.