Electrically heated capillary column for gas chromatograph - has segmented resistance heating elements with negative temp. resistance coefft.

摘要

The chromatograph carrier gas (1) flows through a set of flowmeters (2). The reference gas stream is then routed to the detector (6) and the display (7). The test gas is routed through a capillary column (3). The column has segmented resistance heating film on its outer surface (T1-Tn). The film has a negative temp. resistance coefft. and each segment is controlled to a temp. as required to suit the test sample composition by a controller (8). The test gas is then routed through the detector (6) and display (7).