I have a 5977b coupled to a 8890, it uses a diff pump with a column on the front and rear. The columns go into a CFT switch, the PSD is also put into this switch and the transfer line.

I however can not configure the flows in MASSHUNTER without getting errors.

Columns are 30m x 0.25mm x 0.25um
Transfer line is 2.4m x 0.25mm x 0.0um

The source is a Stainless Steel so i am aiming to have optimum 1.5ml/min flow of He but i was told the PSD should be set higher by around 10-20% in this configuration.

Ideally i would like to have column 1 set at 1.2ml, column 2 set at 0.3ml and the PSD just provide minimal flow to prevent flow upwards but this does not work?