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.

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