Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1988-09-06
1990-04-10
Tung, T.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
73335, 733365, 2041531, G01N 2746
Patent
active
049158163
ABSTRACT:
The polymer hygrometer with lithium doped Nafion was developed to meet the need for a reliable sensor for determining the relative humidity in harsh environments of pulp and paper mills. The sensor can operate in atmospheres that have organic vapors and dust, is unaffected by sulphur dioxide, acidic vapors and strong oxidizing agents. Exceptional stability is shown by the sensor which has withstood twelve months of continuous operation in a paper mill drier duct at temperatures near 65.degree. C. and air flow velocity of 10 m/s with no degradation or calibration change. Materials used in construction of the sensor such as glass, silver filled epoxy, Teflon, platinum wire, and Nafion contribute to ruggedness and immunity to harsh environments.
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Lawson Daniel D.
Shakkottai Parthasarathy
Venkateshan Shakkottai P.
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