Apparatus for gas analysis

Details Apparatus for gas analysis Apparatus for gas analysis

G - Physics

01

N

324/25.5

G01N 33/48 (2006.01) G01N 33/497 (2006.01) G01N 33/98 (2006.01) G01N 1/22 (2006.01)

Patent

CA 1225120

- 14 - ABSTRACT "Apparatus for Gas Analysis" A breath alcohol testing instrument comprises a breathing tube (10) connected to an instrument (15) for detecting alcohol, including a sampling system comprising a spring-loaded piston (30) arranged to draw a gas sample into a sampling chamber (21) in contact with an electro- chemical fuel cell (20), A pressure sensor (52 detects a predetermined breath flow rate and starts a timer (53) which after a predetermined interval actuates a solenoid (40) to release the sample. If the suspect interrupts normal breath flow the system does not "abort". The solenoid (40) is still actuated automatically either immediately when the pressure sensor (52) indicates a predetermined drop in pressure or after the pre- selected time interval. Simultaneously a "test fail" signal is generated (55) and applied to a warning signal generator (56) which actuates a visible or audible warning sign to indicate a non-standard test result. - 14 -

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