Method and instrument for measuring differential oxygen concentration between two flowing gas streams
AssigneeQueen's University at Kingston
InventorsDavid B. Layzell, Stephen Hunt, Adrian N. Dowling
Life of this patent
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Abstract
An apparatus and method for measuring differential oxygen concentration between two flowing gas streams is described. A reference gas and a sample gas in separate gas flow paths are passed, at selected temperature, pressure and flow rate over a respective one of a pair of electrically connected oxygen sensors which produce an output signal proportional to the differential oxygen concentration between the sensors. The output signal may be amplified and recorded by any conventional means. An internal calibration system is also described.
Claims15
An apparatus for measuring differential oxygen concentrations in two flowing gas streams comprising:
- means to control pressure and flow rate of said gas streams;
- means within said temperature-controlled housing means to generate signals representative of pressure and oxygen concentration differentials between said gas streams, comprising first and second oxygen sensors, connected in parallel with each other with opposite polarity, and wherein said first sensor is connected in series with a fixed resistance and said second sensor is connected in series with at least a selected portion of said fixed resistance, such that, at a selected oxygen concentration in both said sensors, the voltage drop across the fixed resistance is zero;
- and computer means to monitor said pressure, flow rate and temperature and said signals representative of said differential pressure and oxygen concentration so as to measure and record differential oxygen concentration in said gas streams.
Dependencies are inferred from the claim text.