Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1978-03-17
1979-11-27
Tung, T.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
204195G, 204 1T, G01N 2746
Patent
active
041760310
ABSTRACT:
An analyzer for continuously and accurately measuring the hypochlorous acid content of chlorinated water containing free available chlorine having a hypochlorous acid component (HOCl) which is a highly reactive disinfectant and a less reactive hypochlorite ion component (OCl.sup.-). To make this determination, a sample of the chlorinated water is sensed by three probes--one yielding an analog signal representing the free available chlorine content (FAC) of the sample; the second, an analog signal representing the pH of the sample; the third, an analog signal representing the sample temperature (T). These signals are digitized and applied as input data to a digital computer wherein the percentage of HOCl in the sample at a reference temperature is established on the basis of the pH data by consulting a memory storing the relationship between the percentages of HOCl and OCl.sup.- in a range of pH values. The percentage of HOCl so established is then corrected on the basis of the T data by consulting a memory storing the relationship between temperature and the equilibrium constant of HOCl. Finally, the temperature-corrected percentage of HOCl is multiplied by the FAC data to determine the HOCl content of the sample.
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patent: 3413199 (1968-11-01), Morrow
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patent: 3723712 (1973-03-01), Komline et al.
patent: 3902982 (1975-09-01), Nakagawa
patent: 3956094 (1976-05-01), Capuano
patent: 3959087 (1976-05-01), Morrow
patent: 3966413 (1976-06-01), Marinenko
patent: 3969209 (1976-07-01), Mueller
patent: 3979665 (1976-09-01), Ebling et al.
Fischer & Porter Co.
Tung T.
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