Construction and Test of a Multisensor Device Including a High-Sensitivity NO2 Sensing Module

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A low-cost electrochemical multisensor for combustion control based on YSZ solid state gas sensors has been manufactured and tested. The technological steps involved the fabrication of three planar elements by means of electrolyte slip casting, lamination, and sintering, and electrode screen-printing. The three resulting co-planar elements, exhibiting complementary sensing properties, were joined onto a single alumina substrate. The complete system does not require a reference atmosphere, and combines an amperometric module for O2 measurement and two potentiometric elements for CO and NO2 detection. Real-time sensor response signals have been studied. For the NO2 sensing module, the addition of Bi2O3 produced an improved signal response as well as a sensitivity enhancement. The optimal working temperature for the multisensor system was established at 600 °C, defined as a compromise between the optimal operating temperatures of the NO2 and CO sensing modules. Our multisensor device demonstrates the possibility of simultaneous detection of NO2, CO and oxygen for its application in domestic gas boilers.


Document Type: Research Article


Publication date: December 1, 2008

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