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. The sensing characteristics and long-term stability of differentkinds of CO  ∕  HC gas sensors (non-Nernstian mixed potential type) duringin situ operation in flue gas from different types of low-powercombustion systems (wood-log- and wood-chip-fuelled) were investigated. Thesensors showed representative but individual sensing behaviour with respect tocharacteristically varying flue gas composition over the combustion process.The long-term sensor signal stability evaluated by repeated exposure toCO  ∕  H 2 ∕  N 2 ∕  synthetic air mixtures showed no sensitivity lossafter operation in the flue gas. Particularly for one of the sensors(Heraeus GmbH), this high signal stability was observed in a fieldtest experiment even during continuous operation in the flue gas of thewood-chip firing system over 4 months. Furthermore, it was experimentallyshown that the signals of these CO  ∕  HC sensing elements yield importantadditional information about the wood combustion process. This wasdemonstrated by the adaptation of an advanced combustion airstream controlalgorithm on a wood-log-fed fireplace and by the development of a combustionquality monitoring system for wood-chip-fed central heaters.

journal of sensors and sensor systems

In situ high-temperature gas sensors: continuous monitoring of the combustion quality of different wood combustion systems and optimization of combustion process