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Comparison of continuous moisture monitors in the range 1 to 15 ppm

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1 Author(s)
Mehrhoff, T.K. ; General Electric Company, Neutron Devices Department, P. O. Box 2908, Largo, Florida 34294‐2908

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Electrolytic, chilled mirror, and aluminum oxide dielectric hygrometers were evaluated by exposing them to known moisture levels in gaseous argon. The experiments were performed over a period of several months to determine the long‐term hysteresis effects which may occur under continuous operation in the range of 1 to 15 ppm (parts per million). Air exposure effects were also examined. The results indicated hysteresis and drift problems in the case of the aluminum oxide dielectric hygrometers. The electrolytic hygrometer required a ‘‘recovery’’ period following exposure to high moisture levels. The chilled mirror hygrometer (with certain specified modifications) proved to be the most accurate and responsive in the 1‐ to 15‐ppm test range.

Published in:

Review of Scientific Instruments  (Volume:56 ,  Issue: 10 )

Date of Publication:

Oct 1985

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