Chemistry: analytical and immunological testing – Oxygen containing – Hydroxyl containing
Reexamination Certificate
2005-07-14
2009-06-02
Warden, Jill (Department: 1797)
Chemistry: analytical and immunological testing
Oxygen containing
Hydroxyl containing
C073S023300, C204S431000, C204S432000, C422S084000
Reexamination Certificate
active
07541192
ABSTRACT:
A process is provided for distinguishing between wet from dry gas with a breath alcohol measuring device, in which a defined sample volume from a gas blown in is fed for sampling to an electrochemical sensor (6), which generates a sensor signal that depends on the reaction of ethyl alcohol. The sensor signal is sent to a control and evaluating unit (4) and is evaluated there to determine the alcohol concentration. To distinguish dry gas from wet gas, provisions are made for the sensor signal to be detected in its time dependence and for the presence of wet gas to be determined when it is observed that a sensor signal of a polarity opposite the polarity of the sensor signal caused by the reaction of ethyl alcohol appeared at first at the beginning of sampling. The process may be used, e.g., in conjunction with the calibration of breath alcohol measuring devices or in so-called interlock systems with a breath alcohol measuring device in order to recognize attempts at manipulation.
REFERENCES:
patent: 43 27 312 (1994-02-01), None
patent: 1 371 982 (2003-12-01), None
Dräger Safety AG & Co. KGaA
Gerido Dwan A
McGlew and Tuttle , P.C.
Warden Jill
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