P1.5 The Optimization of a Photoacoustic Refrigerant Sensor System Using a Three-Chamber Concept
- Event
- SMSI 2020
-
(did not take place because of Covid-19 virus pandemic) - Band
- SMSI 2020 - Sensors and Instrumentation
- Chapter
- P1 Chemical Sensors
- Author(s)
- M. El-Safoury, C. Weber, J. Wöllenstein - Fraunhofer Institute for Physical Measurement Techniques, Freiburg (Germany), O. Kiesewetter - UST Umweltsensortechnik GmbH, Geratal (Germany)
- Pages
- 203 - 204
- DOI
- 10.5162/SMSI2020/P1.5
- ISBN
- 978-3-9819376-2-6
- Price
- free
Abstract
Ever since the ban of the refrigerant R134a in 2017 for all newly manufactured vehicles, due to its high global warming potential, the necessity of low-cost, reliable and precise refrigerant measuring devices has arisen. We present a photoacoustic gas detector for the refrigerants R134a and the environmentallyfriendly alternative R1234yf. The sensor consists of a detection, an absorption and a filter chamber. The influence of the filter chamber length on the sensor signal was evaluated and a signal drift, originating from filter chamber leakage, was successfully eliminated and validated by FTIR measurements.