G - Physics – 08 – B
Patent
G - Physics
08
B
73/69, 340/124.1
G08B 21/00 (2006.01) G01N 27/00 (2006.01)
Patent
CA 1169678
ABSTRACT Apparatus for detecting the presence of a contaminant in a gaseous car- rier which comprises a first piezo electric crystal oscillator, carrier gas feed means for enabling contaminant to act upon said first crystal in a manner which changes the effective mass thereof, measuring means for obtaining a first value related to the total number of oscillations of the crystal during a predetermined period of time, and an arrangement for enabling the first value to be decreased by a second value related to the total number of oscillations of the crystal dur- ing a second time period not greater than said predetermined time period. The means producing said first and second values may be counters arranged to produce said values as respective numerical counts. The said predetermined and second time periods may be determined from a counter driven by a second piezo electric crystal oscillator.
375743
Fetherstonhaugh & Co.
Secretary Of State For Social Services In Her Britannic Majesty'
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