Bernhardsgrütter, Ralf E.Ralf E.BernhardsgrütterHepp, Christoph J.Christoph J.HeppSchmitt, KatrinKatrinSchmittWöllenstein, JürgenJürgenWöllenstein2022-03-142022-03-142021https://publica.fraunhofer.de/handle/publica/41122410.5162/SMSI2021/B5.2The 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 3o-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.enDiesel Exhaust Fluidflow measurementquality monitoring3-Omega-Methodanemometry621conference paper