Apparatus for measuring the alcohol content in human breath

Details Apparatus for measuring the alcohol content in human breath Apparatus for measuring the alcohol content in human breath

1974-07-22

1977-09-13

Reese, Robert M.

Chemistry: physical processes

Physical processes

Crystallization

G01N 2716

Patent

active

040478939

ABSTRACT:
An individual blows into a chamber having a predetermined volume. In the chamber is mounted a gas cell including a heating conductor for catalytic burning of the alcohol and a probe at a predetermined distance from the heating conductor, both embedded in a ceramic porous shell. The lead-in conductor for the probe is connected to the base of a transistor in a threshold circuit which is responsive to the resistance of the gas cell which in turn decreases with increasing alcohol content. When the resistance is less than a predetermined resistance a relay in the transistor circuit operates, lighting an indicator lamp and, in one embodiment, deenergizing the ignition circuit of a vehicle in which the device is mounted.

REFERENCES:
patent: 3418914 (1968-12-01), Finkin
patent: 3440017 (1969-04-01), Palmer
patent: 3609732 (1971-09-01), Kasahara et al.
patent: 3764270 (1973-10-01), Collier et al.
patent: 3879667 (1975-04-01), Kraty et al.

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