Gas detecting device, for e.g. tin oxide, has sensor unit generating signal dependent on type and concentration of present gases, and evaluator determining type and concentration of gases based on changes of signal values with time

摘要

A gas detecting device has a sensor unit (1) for generating a signal dependent on the type and concentration of present gases (5), where the signal generation depends on the temperature of the sensor unit. An evaluator (4) determines the type and concentration of the gases based on changes of signal values with time. The evaluator has a differentiation device, which generates difference quotients from successive signal values.