G - Physics – 01 – N
Patent
G - Physics
01
N
73/104
G01N 33/48 (2006.01) A61B 5/08 (2006.01) G01N 1/22 (2006.01) G01N 33/497 (2006.01)
Patent
CA 1337463
An apparatus for delivering a gas sample such as a breath sample to a solid state sensor operating to sense the concentration of a constituent of the sample such as alcohol while the sensor is maintained within a predetermined temperature range is disclosed. The sensor is disposed within a sensor chamber which communicates by way of a small bleed passageway with a second chamber formed in a conduit having an inlet upstream of the second chamber and an exhaust downstream thereof. The pressure within the second chamber is passively regulated to lie within a predetermined range over an expected range of inlet pressures. This regulation is accomplished by means of flow restrictors disposed between the second chamber and its inlet and exhaust and results in a bleed flow to the sensor through the bleed passageway which is sufficient to ensure an accurate reading within a predetermined sampling interval while further ensuring that the bleed flow does not cool the sensor below its operating temperature range. The lower end of the pressure range at which the second chamber is regulated is selected to correspond to a minimum flow sufficient to provide a deep lung breath sample when that minimum flow is continued with out interruption for a period at least equal to a predetermined sampling interval. This minimum flow can be sensed for example by a pressure sensor operatively disposed in communication with the second chamber. To ensure that the pressure sensor cannot indicate the presence of the minimum flow when the exhaust is blocked, the invention further contemplates connecting the pressure sensor differentially across one of the flow restric- tors separating the second chamber from its inlet and exhaust.
590071
Comeau Felix J. E.
Comeau Felix J.e.
Kupferschmidt Gerald J.
Read Richard E.
Guardian Interlock Systems Corp.
Smart & Biggar
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