User guide

275
Agilent 7890A Gas Chromatograph
Advanced User Guide
Agilent Technologies
9
Columns and Oven
About the Oven 276
Oven safety 276
Configuring the Oven 277
Cryogenic Operation 278
Cryogenic setpoints 278
About Oven Temperature Programming 280
Programming setpoints 280
Oven ramp rates 281
Setting the oven parameters for constant temperature 282
Setting the oven parameters for ramped temperature 282
About the Oven Insert 284
Selecting the correct packed glass column type 285
About the column modes 285
Select a column mode 286
Setting the column parameters for constant flow or constant
pressure 287
Enter a flow or pressure program (optional) 287
Programming column pressure or flow 288
About Columns 285
Backflushing a Column 289
Backflushing when connected to an MSD 289
Nickel Catalyst Tube 295
About the nickel catalyst tube 295
Nickel catalyst gas flows 295
Setting temperatures for the nickel catalyst tube 296