Patent ID: 7541192

Claim:
A process for distinguishing wet from dry gas with a breath alcohol measuring device, the process comprising the steps of: feeding a defined sample volume from a gas blown in the breath alcohol measuring device for sampling to an electrochemical sensor; determining the polarity of the sensor signal at the beginning of sampling using the electrochemical sensor to generate a sensor signal based on the step of feeding, with the sensor signal depending on the reaction of ethyl alcohol; sending the sensor signal to a control and evaluating unit; evaluating the sensor signal at the control and evaluating unit to determine an alcohol concentration including detecting the sensor signal as a function of time and determining the polarity of the sensor signal caused by reaction of alcohol and then determining the presence of wet gas when it is determined in the control and evaluating unit that a sensor signal with a polarity opposite the polarity of the sensor signal caused by the reaction of ethyl alcohol has appeared at first at the beginning of the sampling.