Identification appts. for unknown gaseous substances

摘要

A semiconductor sensor element is connected in series with a resistor to form a potential divider (1). The combination is heated in an electrical oven (3) supplied from a current source (2). Separate sensors monitor the semiconductor surface temperature (13) and the relative humidity (14). This information and the conduction data from the analytical sensor are fed to a microcomputer through an analogue to digital converter. The information is used in a comparison mode with the stored data on known gaseous reactions to establish both qualitative and quantitative data on the unknown substance admitted to the oven interior.