Humidity sensor

Details Humidity sensor Humidity sensor

2005-05-24

2005-05-24

Williams, Hezron (Department: 2856)

Measuring and testing

Gas analysis

Moisture content or vapor pressure

C073S029020, C073S029010, C073S023200, C073S335020, C073S335050

Reexamination Certificate

active

06895803

ABSTRACT:
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.

REFERENCES:
patent: 4143177 (1979-03-01), Kovac et al.
patent: 5777206 (1998-07-01), Zuchner et al.
patent: 5792938 (1998-08-01), Gokhfeld
patent: 6039696 (2000-03-01), Bell
patent: 6349722 (2002-02-01), Gradon et al.

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