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

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 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.