A procedure for calibrating a breathalyser

Details A procedure for calibrating a breathalyser A procedure for calibrating a breathalyser

G - Physics

01

N

G01N 33/98 (2006.01) G01N 33/00 (2006.01) G01N 33/497 (2006.01) G01N 37/00 (2006.01)

Patent

CA 2226055

The present invention relates to a procedure for calibrating a breathalyser (7) by means of a calibrating gas generator (1) with a fluid reservoir (2) for an aqueous ethanol solution (3), and air supply devices, this being designed so as to allow air to percolate through the ethanol solution and conduct gas from the atmosphere above the ethanol solution to the breathalyser (7). In order to equalize the temperature dependency of the ethanol concentration in the gas phase without the need to carry out thermal stabilisation, the process is conducted in the following steps: measurement of the temperature of the ethanol solution by a thermometer (8) and generation of an electrical signal that represents the temperature; reception of the electrical signal in a sender unit (9) and passage of the electrical signal, or a signal processed therefrom, to the breathalyser (7) and to its electronic evaluation unit, automatic conversion in the electronic evaluation unit of the test reading of the breathalyser (7) to the test result that is to be anticipated at a given reference temperature, using a predetermined dependency of the temperature of the aqueous ethanol solution obtained from the electrical signal or from the signal processed therefrom and the given reference temperature, and evaluation of the test reading anticipated at the given reference temperature in order to calibrate the breathalyser (7).

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