Water activity and dew point temperature measuring apparatus and

Thermal measuring and testing – Transformation point determination – Between gaseous and liquid states

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374 16, G01N 2568

Patent

active

058167048

ABSTRACT:
A dew point temperature measuring apparatus and method, which may be used to determine water activity, includes a chamber in which a sample of air is measured, an air circulation device positioned within the chamber, a sensor to measure the sample temperature, a relative humidity sensor, and a diverter for causing air circulating within the chamber to directly impinge the relative humidity sensor. Another embodiment involves mounting an air circulation device within the chamber such that it forces air inside the chamber to impinge directly upon the relative humidity sensor to reduce boundary layer resistance. Still another embodiment of the invention involves utilizing a temperature control device to control the temperature of interior surfaces within the chamber at a temperature higher than the sample of air within the chamber. Yet another embodiment of the present invention involves a product relative humidity sensor in which a dew point temperature sensor, such as a resistive or capacitive sensor, is used in combination with a heater and/or a fan to speed the time required to reach equilibrium and the accuracy of dew point temperature measurements.

REFERENCES:
patent: 3142986 (1964-08-01), Wood et al.
patent: 4579462 (1986-04-01), Rall et al.
patent: 5302026 (1994-04-01), Phillips
patent: 5507175 (1996-04-01), Cooper

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