Measuring and testing – Gas analysis – Gas chromatography
Patent
1980-02-07
1981-11-17
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Gas chromatography
G01N 3100
Patent
active
043003850
ABSTRACT:
A method for determining the alcohol content of a person's blood by the measurement of the alcohol concentration of a person's breathing air comprises using a breathing tube through which the person breathes which does not permit any inhaling therethrough. An alcoholometer is connected to the tube and a sensor of the meter is disposed in association with the tube so that instant alcohol concentration values are determined. The values which are determined are fed into a holding circuit which feeds these values to an indicator. The indicator is operated so that only alcohol concentration value higher than a previous one is recorded in the indicator. During the entire time of breathing the quantity of breathing air that is passed through the tube is measured and after a quantity which would be sufficient for alcohol content evaluation is reached is the value on the indicator used as an indication of the alcohol concentration. The apparatus associated with the tube advantageously includes in addition to the alcoholometer a gas meter which includes a counter connected to the indicator in holding circuit with suitable lamps or other signals for indicating when the value shown in the indicator obtains the alcohol concentration value.
REFERENCES:
patent: 3877291 (1975-04-01), Hoppesch et al.
patent: 4090078 (1978-05-01), Heim
patent: 4163383 (1979-08-01), VanderSyde et al.
Dragerwerk Aktiengesellschaft
Kreitman Stephen A.
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