VORRICHTUNG ZUR ERFASSUNG UNTERSCHIEDLICHER SCHADSTOFFGEHALTE VON GASSTROEMEN.

摘要

The detector (4) and its switching mechanism are mounted together on the flap (3) which when opened ventilates the passenger compartment. The outside air and the air contained within the vehicle are sampled alternately at intervals of a few seconds for the purpose of almost continuous comparison of the deg. of pollution within and outside the vehicle. The output signal from the detector is used to control the position of the flap. This can be held closed when the quality of the exterior air is found to be insufficient for admission to the passenger compartment of the vehicle.