Pollutant sensor for motor vehicles, protective working cabins, etc.

摘要

It is known that sensors have a temperature-dependent display sensitivity. At the point of installation, in particular as pollutant sensors in cars for detecting air pollution, the said sensors are subjected to high fluctuations in temperature. Furthermore, the sensor's heater produces its own heat. In order to ensure a constant display even in the case of widely varying temperature fluctuations, it is proposed according to the invention that the sensor element (2) for detecting the sensor temperature be arranged directly on the sensor (1) so that both the temperature at the sensor (1) and the conduction away of heat, which is increased at this point by convection, can be detected. The sensor heating voltage is controlled by the sensor (2) to produce a constant heating temperature. <IMAGE>