HEINZMANN’s SCR system is used to reduce the level of pollutants in the exhaust gas produced by combustion engines, and is based on the XIOS universal governor. XIOSSCR reliably and very precisely regulates the supply of AdBlue to the exhaust gas by controlling pumps and the corresponding injectors. All relevant measurements and operating data are used directly to provide fast, high-precision control. The system also includes the corresponding NOx and temperature sensors, extensive safety functions for protecting catalytic converters, and an economical tank management concept.