Title: Method and arrangement for determining alcohol content in the breath

Abstract: A method for determining the alcohol content in the exhaling respiratory air using an alcohol measuring instrument and measuring the alcohol content when the exhaling air transmits the determined value of the alcohol concentration. This determined value of alcohol concentration occurs when the time variation related to the height of the alcohol signal is below a predetermined threshold value and the velocity of flow of the exhaling air is above a given value and is maintained without interruption for a given time. The apparatus includes an infrared measuring instrument which is connected into the respiratory air current and measures the alcohol concentration of the exhaling air. This value is applied to an indicator through a linear gate when an AND-gate is triggered by threshold comparators and a timing element activated by a threshold comparator.

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Inventors: Heim, Ulrich (Reinfeld, DT)

Application Number: 762807
Filing Date: 1977-01-26
Publication_date: 1978-05-16
Assignee: Dragerwerk Aktiengesellschaft (DT)
Primary Class(es): 250/343 73/23.3, 422/84, 436/132, 436/900
Other Classes:
US Patent Ref:

2867511	Jan, 1959	Harger	23/254.
3622278	Nov, 1971	Elzinga et al.	23/232.
3726270	Apr, 1973	Griffis et al.	23/254.
3823601	Jul, 1974	Hoppesch	23/254.
3830630	Aug, 1974	Kiefer et al.	23/232.
3842345	Oct, 1974	Padgitt et al.	23/232.
3910261	Oct, 1975	Ragsdale et al.	23/254.
3951607	Apr, 1976	Fraser	23/254.

Other Refs:
Primary Examiner: Scovronek, Joseph
Assistant Examiner:
Attorney: McGlew and Tuttle