Prism elements having TIR surfaces placed in close proximity to the active area of a SLM device to separate unwanted off-state andor flat-state light from the projection ON-light bundle. The recessed area is partially covered by the top wall of the rim when the rim is installed on the wheel. An on-site analyzer such as an optical analyzer andor an electrochemical analyzer can be mounted in the device for analyzing the fluid. The processor compares the temperature of the exhaust gas and the temperature of at least one of the casings, opens the associated switch valve based on the comparison result, and preheats at least one of the filters with the exhaust gas.