Gas sensor

Details Gas sensor Gas sensor

1984-05-18

1986-05-06

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204 1T, 204415, 204431, 204432, G01N 2746

Patent

active

045870039

ABSTRACT:
An electro-chemical cell has porous sensing and counter electrodes S, C mounted on porous PTFE tapes 4, 5 and contacting the electrolyte of the cell which is drawn from a reservoir by a wick 12. Gas passes directly to the electrode S at 14 and any gas which does not react passes through the electrode S to the electrode C, passing across the electrolyte space by way of a porous insulating separator 10 which is partly hydrophilic and partly hydrophobic, thus providing a path for gas while preserving the electrolyte path between the electrodes. The current flowing between the electrodes is measured in the usual way. The electrode C will not see any particular gas which reacts fully at the electrode S since it will be removed by this electrode first. The electrode C will, however, see any other gas which only partially reacts at the electrode S, thus achieving partial or even complete elimination of the effect of an interfering gas.

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patent: 3855096 (1974-12-01), Bergman
patent: 3928162 (1975-12-01), Takata
patent: 4152233 (1979-05-01), Chand
patent: 4233031 (1980-11-01), Matson et al.

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