Breath analyser and device for calibrating it

Details Breath analyser and device for calibrating it Breath analyser and device for calibrating it

G - Physics

01

N

73/69, 73/0.5

G01N 1/24 (2006.01) G01N 27/04 (2006.01) G01N 33/00 (2006.01) G01N 33/497 (2006.01)

Patent

CA 1118230

ABSTRACT A breath analyser is disclosed which has a semi-conductive sensor for measuring the alcohol content of a person's breath, the breath to be analysed being drawn, by a pump, through the sensor from a collector contain- ing a sample of the breath. To calibrate the sensor, there is used a calibrat- ing gas having a known alcohol content, this gas being stored under pressure in a cylinder. The calibrating gas is allowed to pass under pressure through valves to a chamber having a piston therein, so as to fill the chamber with gas. The valves are then switched so as to connect the chamber to the sensor, whereby the calibrating gas is passed through the sensor by the action of a spring on the piston.

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