Transfer from GC 6890 to GC 7890

Hello,

I got 2 Questions.

First one:

I got in the method from our 6890 the parameter "Vent Flow"

It has the value 0.1. 

On the A7890 this value is not present anymore.

2nd Question:

There is a new parameter "Septum Purge Flow " I cant turn it off. Whats the default Value on the 6890 ?

What these settings do ?

Regards

White