This is how I set “measure flow rate” up.
We need numbers in the ml/min range.
After 2min I’d moved 6.5mls, so imo the orifice is probably too small. I can absolutely turn the pressure up to increase flow.
I also had to trim the column stub I used to achieve ANY flow.
Either because it was blocked (why it was trimmed?) or I blocked it stuffing it through the ferrule or septum
I usually use this setup when adjusting flow rate at end of column (detector end).
EDIT: Hugh is sending a new flow restrictor. I should be seeing about 200ml/min at 75PSI!! (and shouldn’t be above 25 PSI)