Capteur Sensors and Analysers Limited

Lucas Industries Limited

United Kingdom Atomic Energy Authority

Imi Kynoch Limited

Capteur Sensor & Analysers, Ltd.

David Edward Williams

Peter McGeehin

Patrick Timothy Moseley

Patrick T Moseley

Bruce C Tofield

Geoffrey Stephen Henshaw

Eliot Sizeland

Ruth Ridley

Pratt Keith Edwin

Darryl Hirst Dawson

Kamal K Verma

Laura Jane Gellman

John M Fisher

George V Planer

A sensor for detecting the presence of gas and methods for use. The sensor has a low sensitivity to relative humidity and high sensitivity to the presence of gases such as carbon monoxide. The sensor is comprised of ternary oxides of the formula Cr (M1 M2 ) O with M1&equals;Fe or Mn, M2&equals;Fe, Mn, or Al, 0.005&lE;x&lE;1.95, 0.005&lE;z&lE;0.995; ternary oxides of the formula Cr (M1 M2 ) O with M1&equals;Fe or Mn, M2&equals;Ti, 0.005&lE;x&lE;1.95, 0.005&lE;z&lE;0.45; or quaternary and quinternary oxides of the formula Cr ((M1 M2 M3 ) M4 ) O with M1&equals;Fe, M2&equals;Mn, M3&equals;Al, and M4&equals;Ti, 0&lE;a,b,c&lE;1, 0.005&lE;x&lE;1.95, and 0.005&lE;z&lE;0.45.

Materials for solid-state gas sensors

The selectivity of response of resistive gas sensors to specific gases or vapors is improved by the selection of specified gas-sensitive materials which are not previously known for the applications described, which include detection of hydrocarbons in the presence of CO, H.sub.2 S, SO.sub.2, chlorine, NO.sub.2, CO.sub.2 (especially in low concentrations), CFC's, ammonia, free oxygen by determination of partial pressures, and numerous organic gases and vapors.

Semiconducting oxide gas sensors

Multi-electrode gas sensors and methods of making and using them

A method for determining the presence of a first gas in a second gas uses a gas sensor made up of at least two pairs of electrodes, each pair of electrodes having different spacing between the electrodes. The electrodes of the gas sensor have surfaces that are reactive to the gases under investigation. The gas sensor is exposed to the gases, and the electrical resistances between the pairs of electrodes are measured over a period of time. `The results are compared with a calibration curve to determine if the first gas is present in the second, and to determine of the sensor is malfunctioning.

Gas sensor

Resistive gas sensing

Resistive gas sensing, especially for detection of ozone

Monitoring of multiple-electrode gas sensors

Electro-analysis of liquids and sensing elements for use therein

A moisture sensor which includes a moisture sensitive material and electrodes in communication with the moisture sensitive material, the moisture sensitive material containing a substantially electrically insulating substance derived from a colloidal dispersion and, distributed in or on the substance, an electrically conducting substance.

Sensors

An oxygen sensor which exhibits a change in electrical resistance as a function of oxygen partial pressure comprises at least one of strontium ferrate, barium ferrate and strontium barium ferrate, in which part of the iron in the ferrate lattice has been replaced by at least one element of valency greater than 3, such as titanium, cerium, niobium or tantalum.

Oxygen sensors

A titanium-nickel alloy containing 51 to 55.4% nickel with the addition of optional quantities of niobium intended for use as an anode in the electrowinning of metal, particularly cobalt, an electrolytic cell incorporating such an anode and a method of operating such a cell.

Anode

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Abingdon, United Kingdom

David Edward Williams