Back to results
US 5,351,029 AGranted
Sensor for determining carbon monoxide
AssigneeRobert Bosch GmbH
InventorsGerhard Huth, Detlef Baresel
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeRobert Bosch GmbH
InventorsGerhard Huth, Detlef Baresel
Estimating the term…
The invention relates to a sensor for the determination of carbon monoxide, especially in gas mixtures containing oxygen, on the basis of doped metal oxides whose electric conductivity is a function of the composition of the gas mixtures. Suitable metal oxides are those having n-type conductivity, the dopants used being other oxides of a metal having a maximum valency <4; oxides of a metal catalyzing the reaction of carbon monoxide with oxygen to give carbon dioxide, each in amounts from 0.01 to 0.2 mol %; and from 0.001 to 0.1 mol % of an oxide of a metal of the 5th subgroup of the Periodic Table of Elements. The sensors are notable for a small resistance-temperature coefficient while having high sensitivity and low hysteresis.
A sensor for the determination of carbon monoxide in a gas mixture comprising a doped n-type metal oxide whose electric conductivity is a function of the composition of the gas mixture, dopants for said metal oxide comprising (a) from 0.01 to 0.2 mol % of an oxide of another metal having a maximum valency <4 together with (b) from 0.01 to 0.2 mol % of an oxide of a metal, which catalyses the reaction of carbon monoxide to carbon dioxide and (c) from 0.001 to 0.1 mol % of an oxide of a metal of the 5th subgroup of the Periodic Table of the Elements.
Dependencies are inferred from the claim text.