METHOD AND SENSOR DEVICE FOR DETECTING GASES OR FUMES IN AIR

The invention relates to a sensor device comprising a sensor element for detecting gases and fumes in air, as well as to a method of operating such a sensor system. The sensor element is preferably a heated metal-oxide sensor having a heating structure and a gas-sensing layer whose temperature can b...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KLEIN, RAINER, VOSS, WOLFGANG, KIESEWETTER, OLAF, GERHART, JESSICA, SUPPLY, CARSTEN, RUMP, HANNS, SCHOCKENBAUM, HEINZ-WALTER
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ALARM SYSTEMS DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING FIRE-FIGHTING HUMAN NECESSITIES INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES LIFE-SAVING MEASURING ORDER TELEGRAPHS PHYSICS SIGNALLING SIGNALLING OR CALLING SYSTEMS TESTING
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Beschreibung
Zusammenfassung:	The invention relates to a sensor device comprising a sensor element for detecting gases and fumes in air, as well as to a method of operating such a sensor system. The sensor element is preferably a heated metal-oxide sensor having a heating structure and a gas-sensing layer whose temperature can be kept constant by means of the heating structure and a control device. To protect it against air currents the sensor element is positioned in a preferably heat-insulated casing into which gas is able to penetrate by passing through a gas-permeable diffusion layer. According to a method provided for by the invention the resistance of the heating structure, which serves as a measure of the temperature of the gas-sensing layer, is used as a reference for temperature control. The temperature of the sensor element is influenced in a targeted fashion by the addition of other disturbance quantities to the control quantity "sensor temperature". Evaluation is carried out by comparison of the current sensor signal with a reference value which is formed from the weighted average signal of the sensor values and can be adjusted to the prevailing situation.