AUTOTRAC® is a measurement specific gas chromatograph that is optimized for SF6 detection. It is under microprocessor control and is self calibrating. The microprocessor allows the AUTOTRAC® to perform many simple ventilation and flow rate measurements under automatic control, thereby minimizing or completely eliminating the amount of external assistance that an operator must provide in order to obtain satisfactory data. AUTOTRAC® can also be configured to respond to perfluorocarbon vapors, and halocarbons used as tracers.