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US 7,461,540 B2Granted
Metal-oxide gas sensor
OwnerRalf Mönkemöllerinventor
Life of this patent
Estimating the term…
Abstract
A gas sensor has a dielectric base having a face, a heater element on the face, electrodes connected to the heater element, and a gas sensor element on the heater element that when heated changes impedance when in contact with a predetermined gas. The element is in electrical contact with the heater element. A power supply connected to the heater element electrodes energizes same and heats the gas sensor to its operating temperature. A sensor electrode is also in contact with the sensor element so that the impedance of the sensor element can be measured between the sensor electrode and one of the heater element electrodes.
Claims7
A gas sensor comprising:
- a dielectric base having a face;
- a heater element on the face;
- electrodes connected to the heater element;
- a gas sensor element on the heater element that when heated changes impedance when in contact with a predetermined gas, the element being in electrical contact with the heater element;
- means connected to the heater element electrodes for energizing the electrodes and heating the gas sensor;
- and
- a sensor electrode also in contact with the sensor element, whereby the impedance of the sensor element can be measured between the sensor electrode and one of the heater element electrodes.
4 more elements
Dependencies are inferred from the claim text.