SELECTIVE SOLID-STATE GAS SENSORS AND METHOD

摘要

A method for detecting gases by selectively moving a gas through a gas permeable membrane to a semiconductor sensor which qualitatively reports such gas as an electrical output after a predetermined time lag. The time-output information is recognized as a result of previous calibration of the sensor and gas permeable membrane with known gases, such calibrations comprising standards for comparison. The method is practiced to advantage with a gas detection assembly including a housing which holds a gas permeable membrane in spaced relationship to the gas sensor which may operate at elevated temperatures from a heating element therein. The gas detection assembly is used in circuits having detection means which may be audio or visual, including meter readout.