Trace gas detection method

Details Trace gas detection method Trace gas detection method

1975-05-01

1977-02-08

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204 1R, G01N 2746

Patent

active

040070964

ABSTRACT:
The disclosure relates to electro-chemical sensors for sensing gaseous nitrogen dioxide in the presence of carbon monoxide, oxygen, nitrogen, sulfur dioxide, nitric oxide and in chemically compatible mixtures of these gases as well as capable of sensing gaseous materials which are more strongly oxidizing than NO.sub.2, the sensor being formed from an Fe-1173 glass. The disclosure also relates to an electro-chemical sensor formed from 15% manganese As.sub.2 S.sub.3 glass which is capable of sensing gaseous materials which are more oxiding than NO.sub.2 in the presence of NO.sub.2, CO, O.sub.2, N.sub.2, SO.sub.2, NO and in chemically compatible mixtures of these gases. The disclosure also includes apparatus for determining when NO.sub.2 is being sensed rather than more strongly oxidizing gaseous materials by the simultaneous use of the Fe-1173 glass electro-chemical sensor and the sensor formed from 15% Mn-As.sub.2 S.sub.3 glass.

REFERENCES:
patent: 3622487 (1971-11-01), Chand et al.
patent: 3622488 (1971-11-01), Chand et al.
patent: 3709813 (1973-01-01), Johnson et al.
patent: 3776832 (1973-12-01), Oswin et al.
patent: 3821090 (1974-06-01), Topol et al.
patent: 3826971 (1974-07-01), Jasinski et al.
patent: 3835009 (1974-09-01), Barna et al.

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