Apparatus for detecting and measuring the hydrogen content in a

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204195P, 364104, 422 81, G01N 2746

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active

042714745

ABSTRACT:
The invention relates to an apparatus for measuring the concentration of gaseous hydrogen dissolved in a liquid substance. The apparatus comprises an electrochemical cell constituted of a polymeric membrane in contact with a sample of the liquid substance and which is permeable to hydrogen, of an electrolyte capable of causing an oxidation reaction of the hydrogen diffused through the polymeric membrane, at a first electrode, and a reduction reaction of an oxygenated gas at a second electrode, so as to deliver an electric current proportional to the hydrogen concentration to be measured. An electrovalve operates, when activated, to exhaust the liquid substance sample at a predetermined instant in the measuring process. Moreover, the circuit amplifies a voltage corresponding to the value of the current proportional to the concentration, which current flows through a load resistance mounted in parallel across the first and second electrodes and the input of the amplifying circuit. A display device is connected to the output of the amplifying circuit and supplies a digital measure of the hydrogen concentration in the liquid substance. A control unit determines the operation times of the electrochemical cell, of the electrovalve as well as of the digital display device pursuant to a predetermined sequence.

REFERENCES:
patent: 3325378 (1967-06-01), Greene et al.
patent: 3509034 (1970-04-01), Paine
patent: 3654113 (1972-04-01), None
patent: 3672843 (1972-06-01), Rosse et al.
patent: 3874850 (1975-04-01), Sorensen et al.
patent: 3963440 (1976-06-01), Stein et al.
patent: 3997420 (1976-12-01), Buzza
patent: 4039933 (1977-08-01), Moran
patent: 4090848 (1978-05-01), Naono
patent: 4121907 (1978-10-01), Roque
patent: 4127111 (1978-11-01), Drolet
G. Belanger et al., IEEE Trans. Electr. Insul. vol. EI-12, No. 5, pp. 334-340, (1977).
Kent Tech. Rev., No. 15, pp. 17-19, Feb. 1976.

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