Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1978-05-22
1980-04-08
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
23232E, 204 1T, 324425, 422 98, G01N 2746
Patent
active
041971779
ABSTRACT:
Apparatus for analyzing the concentration of nitrogen oxides in a gas draws the gas through three separate housings in succession. Moisture is removed from the gas in the first housing and an oxidizing agent in the second chamber converts the nitrogen oxides in the dried gas into nitrogen dioxide. The third housing contains an electrolytic cell producing an electric signal proportional to the concentration of nitrogen dioxide in the converted gas. The electrolytic cell has an anode of activated carbon in a perforated jacket located in a neutral electrolyte and a cathode contacted by the converted gas. The cathode is composed of platinum tape wound onto a support. A sheath of glass fibres contacts both the cathode and the electrolyte and lifts the electrolyte by capillary action to wet the cathode.
REFERENCES:
patent: 3028317 (1962-04-01), Wilson et al.
patent: 3236759 (1966-02-01), Robinson
patent: 3314863 (1967-04-01), Hersch et al.
patent: 3835322 (1974-09-01), Komatsu
patent: 3856473 (1974-12-01), Dillon
P. Hersch et al., J. Air Pollution Control Assoc., vol. 13, No. 11, pp. 538-541 (1963).
Paul Hersch et al., "Galvanic Monitoring of Nitrogen Dioxide and Nitric Acid", pp. 1-18, (1963).
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