Polymer hygrometer for harsh environments

Details Polymer hygrometer for harsh environments Polymer hygrometer for harsh environments

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.

REFERENCES:
patent: 4083765 (1978-04-01), Lawson
patent: 4280885 (1981-07-01), Savery
patent: 4514278 (1985-04-01), Stephens et al.
patent: 4681855 (1987-07-01), Huang
Humidity--Temperature Transmitter, Rotronic Instrument Corp. Brochure, HT150 Series, 7 High St., Huntington, NY, 11743, 1988.
"Vaporsense 1000", Pacer Systems Inc. Brochure, 900 Technology Park Dr., Billerica, MA, 01821, 1988.
"Capacitive Solid State Dew Point Hygrometer", Honeywell Brochure, 12001 Highway 55, Plymouth, MN, 55441.
"ECON 200--The New Industrial Dew Point Measuring System", Vaisala Brochure, 2 Tower Office Park, Woburn, MA 01801.

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