Measuring and testing – Gas analysis – Gas chromatography
Patent
1993-06-01
1994-04-19
Williams, Hezron E.
Measuring and testing
Gas analysis
Gas chromatography
364497, 422 84, 436900, G01N 33497
Patent
active
053035755
ABSTRACT:
An automated unsupervised apparatus for conducting a blood alcohol content level test on an individual user, and subsequently discerning and displaying a meaningful test result, is disclosed. The apparatus comprises an alphanumeric display for instructing the individual user to blow into the apparatus so as to provide a breath sample. A pressure switch is used to monitor the gauge pressure of the individual user's breath sample in order to determine whether the gauge pressure is at or above a threshold value for a predetermined length of time, typically three seconds. The alphanumeric display instructs the individual user to wait and blow again in the event that the gauge pressure does not remain at or above the threshold value for the predetermined length of time. A testing sample of the individual user's breath sample is captured in a fuel cell type alcohol concentration sensor. The alcohol concentration sensor in conjunction with an operational amplifier, a peak circuit detector and an analogue to digital convertor, effects an automated electrochemical analysis of the testing sample. A measurement value of the alcohol content of the testing sample is produced, and introduced into a microprocessor, where a numeric value derived from the measurement value and related to the individual user's blood alcohol content level, is calculated. The alphanumeric display displays this numeric value and the category corresponding to the numeric value as being one of "pass", "warn", and "fail".
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Brown Gordon R.
Herlinger Gerald H.
Alcotech Research Inc.
Hofbauer Patrick J.
Roskos Joseph W.
Williams Hezron E.
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