Gas sensors
AssigneeBritish Gas Corporation
InventorsGary S. V. Coles, Geraint Williams
Life of this patent
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Abstract
SnO.sub.2 gas sensors are described incorporating Bi.sub.2 O.sub.3 in an amount less than 35% but sufficient to confer hydrogen sensitivity and selectivity to the sensors described comprises 25% by weight Bi.sub.2 O.sub.3 and incorporates a platinum catalyst.
Claims12
A method of measuring hydrogen concentrations in gases comprising the use of a sensor of the SnO.sub.2 type comprising a layer of tin (IV) oxide (SnO.sub.2) incorporating bismuth (III) oxide (Bi.sub.2 O.sub.3) wherein the Bi.sub.2 O.sub.3 is present in an amount in excess of 17% by weight and less than 35% by weight based on the total amount of SnO.sub.2 and Bi.sub.2 O.sub.3 and sufficient that the sensor has hydrogen sensitivity and selectivity over the gases CO and CH.sub.4.
A method of measuring hydrogen concentrations in gases comprising the use of a sensor of the SnO.sub.2 type comprising a layer of tin (IV) oxide (SnO.sub.2) incorporating bismuth (III) oxide (Bi.sub.2 O.sub.3) in which the Bi.sub.2 O.sub.3 is present in an amount in excess of 17% by weight and less than 35% by weight based on the total amount of SnO.sub.2 and Bi.sub.2 O.sub.3 such that the sensor has hydrogen sensitivity and selectivity over the gases CO and CH.sub.4 and in which the layer of tin (IV) oxide incorporating bismuth (III) oxide is deposited on a substrate from a slurry.
Dependencies are inferred from the claim text.