Abstract
ABSTRACTThe design, use and performance of a capacitance manometer for the measurement of water activity (aw) are evaluated. The device consists of a sensitive capacitance sensor for measuring the vapor pressure of a sample. This value is then divided by a known value for the vapor pressure of pure water at a specific temperature to obtain aw. Precision and accuracy of this Instrument are determined and compared to a conventional electric hygrometer. These parameters are similar to the hygrometer; however, the principal advantages of the capacitance manometer may occur in circumstances in which direct measurements of aw are required and situations in which contamination of hygrometric sensors could occur.
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