gas flow rate in Varian

[alcorn]

Hi everyone

I have questions about EFC of Varian CP-3800 GC.
How is total gas flow calculated? When I set column flow to 1 ml/ml and split ratio to 10, a total gas flow is 22 ml/min. In other column flow and split ratio values I also have excess flow in total flow rate.

When septum purge is altered, total flow rate is remained constant. Does septum purge flow contributed in total gas flow?
I test these values in two Varian CP-3800 instruments.

Another question is about gas saver mode function:
I set total gas flow of 2 ml/min in gas saver mode (which is activated after 5 min when active method is not run). Is it possible knowing how much column flow rate is when I set column flow of 1 ml/min and split ratio of 100 in active method (septum purge flow =0). How gas flow rates are set in gas saver mode?

Thanks.

[Peter Apps]

Check that you have the column dimensions entered properly. Also measure the actual flow out of the split vent and septum purge using an independent flow meter.

A gas saver flow of 2 ml min will not be enough to maintain inlet pressure, you will get an error that will cause the GC to shutdown.

Peter