{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,14]],"date-time":"2025-10-14T07:07:05Z","timestamp":1760425625202,"version":"build-2065373602"},"reference-count":46,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2018,2,3]],"date-time":"2018-02-03T00:00:00Z","timestamp":1517616000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Metal oxide (MOX) gas sensors sensitively respond to a wide variety of combustible, explosive and poisonous gases. However, due to the lack of a built-in self-test capability, MOX gas sensors have not yet been able to penetrate safety-critical applications. In the present work we report on gas sensing experiments performed on MOX gas sensors embedded in ceramic micro-reaction chambers. With the help of an external micro-pump, such systems can be operated in a periodic manner alternating between flow and no-flow conditions, thus allowing repetitive measurements of the sensor resistances under clean air,      R 0     , and under gas exposure,      R  g a s      , to be obtained, even under field conditions. With these pairs of resistance values, eventual drifts in the sensor baseline resistance can be detected and drift-corrected values of the relative resistance response     R e s p =  (   R 0  \u2212  R  g a s    )  \/  R 0      can be determined. Residual poisoning-induced changes in the relative resistance response can be detected by reference to humidity measurements taken with room-temperature-operated capacitive humidity sensors which are insensitive to the poisoning processes operative on heated MOX gas sensors.<\/jats:p>","DOI":"10.3390\/s18020453","type":"journal-article","created":{"date-parts":[[2018,2,5]],"date-time":"2018-02-05T04:29:42Z","timestamp":1517804982000},"page":"453","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Self-Test Procedures for Gas Sensors Embedded in Microreactor Systems"],"prefix":"10.3390","volume":"18","author":[{"given":"Andreas","family":"Helwig","sequence":"first","affiliation":[{"name":"Airbus Central R&amp;T, D-81663 Munich, Germany"}]},{"given":"Angelika","family":"Hackner","sequence":"additional","affiliation":[{"name":"Airbus Central R&amp;T, D-81663 Munich, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4653-5460","authenticated-orcid":false,"given":"Gerhard","family":"M\u00fcller","sequence":"additional","affiliation":[{"name":"Department of Applied Sciences and Mechatronics, Munich University of Applied Sciences, D-80335 Munich, Germany"}]},{"given":"Dario","family":"Zappa","sequence":"additional","affiliation":[{"name":"SENSOR, Dipartimento di Ingegneria dell\u2019Informazione, Universit\u00e0 degli Studi di Brescia, via Valotti 9, 25123 Brescia, Italy"}]},{"given":"Giorgio","family":"Sberveglieri","sequence":"additional","affiliation":[{"name":"SENSOR, Dipartimento di Ingegneria dell\u2019Informazione, Universit\u00e0 degli Studi di Brescia, via Valotti 9, 25123 Brescia, Italy"}]}],"member":"1968","published-online":{"date-parts":[[2018,2,3]]},"reference":[{"key":"ref_1","unstructured":"Moseley, P.T., and Tofield, P.T. 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