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Simultaneous Quality and Flow Rate Monitoring of Diesel Exhaust Fluid by Using A Platinum Thin Film Sensor

: Bernhardsgrütter, Ralf E.; Hepp, Christoph J.; Schmitt, Katrin; Wöllenstein, Jürgen

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SMSI 2021, Sensor and Measurement Science International : Digital Conference, 3 - 6 May 2021
Wunstorf: AMA Service, 2021
ISBN: 978-3-9819376-4-0
Conference "Sensor and Measurement Science International" (SMSI) <2021, Online>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IPM ()
Diesel Exhaust Fluid; flow measurement; quality monitoring; 3-Omega-Method; anemometry

The monitoring of the quality and the flow rate of the diesel exhaust fluid is essential for an efficient selective catalytic reduction in diesel combustion. This article presents a platinum thin film sensor using a combination of the constant temperature anemometry and the 3ω-method to measure continuously the urea content and the flow rate with compensated fluid dependence. The urea content can be determined within 3 % by weight and the flow rate within 4 % full scale. The presented method allows continuous monitoring of two main parameter in the selective catalytic reduction.