G - Physics
01
N
G01N 25/56 (2006.01) A61M 16/00 (2006.01) G01N 27/12 (2006.01) G01N 27/22 (2006.01)
Patent
CA 2359520
-17- A method and apparatus are described for sensing the absolute humidity of gases where the relative humidity of gases are measured, the humidity transducer is heated, the resulting temperature measured and the absolute humidity calculated (based on the power to heat said transducer, the temperature of said transducer and the relative humidity). In further embodiments the humidity transducer may be heated to a pasteurisation temperature, to substantially kill any common pathogens present on the humidity transducer. The flow rate may be determined to estimate a more instantaneous valve of humidity. The operation of the sensor may be continually monitored for correct operation and various constructions disclosed for improving the efficiency of operation.
Abeysinghe Kaumali Prasangika
Seakins Paul John
Smith Malcolm David
Fisher & Paykel Healthcare Limited
Riches Mckenzie & Herbert Llp
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