| abstract |
A process for calibrating a breath alcohol-measuring instrument (7) with a calibrating gas generator (1) with a liquid container (2) for aqueous ethanol solution and air feed device, which allow air to bubble through the ethanol solution and for passing gas from the atmosphere above the ethanol solution to the breath alcohol-measuring instrument (7). To equalize the temperature dependence of the ethanol concentration in the gas phase, without having to perform thermostatting, the process is applied with the following steps: Measurement of the temperature of the ethanol solution by means of a thermometer (8) and generation of an electric signal representing the temperature; reception of the electric signal in the transmission device (9) and passing on the electric signal or a signal processed from same to the breath alcohol-measuring instrument (7) and into its electronic evaluating unit; automatic conversion of the measurement result of the breath alcohol-measuring instrument (7) in the electronic evaluation unit into the measurement result to be expected at a preset reference temperature by means of a preset dependence on the temperature of the aqueous ethanol solution, which is obtained from the electric signal or from the processed signal, and on the preset reference temperature, and evaluation of the measurement result expected at the preset reference temperature for calibrating the breath alcohol-measuring instrument (7). |