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Low flow-rates
Posted: Fri Sep 14, 2007 4:50 pm
by Vox
So I've finally got gas running to my GC and she's conditioning my column right now. All my gas is running off bottles. The regulator for my carrier gas (N2) only goes up to 25 PSI. I'm only getting about 2-3ml min for my flowrate through the column. My column head pressure is 15 PSI. Is there an way to increase flow-rate, or do I just need a regulator that goes to 40?
Thanks.
Posted: Fri Sep 14, 2007 7:25 pm
by Bruce Hamilton
Shorten your column.
Seriously, get a higher pressure regulator, unless you are only going to be using short columns. You need about a 10 psi delta between upstream and downstream for most regulators to control accurately.
Bruce Hamilton
Posted: Fri Sep 14, 2007 8:10 pm
by chromatographer1
Bruce is right.
A pressure regulator with a capacity of 60 or 100 psi is preferred.
Unless you intend to use short 0.25mm capillary, or 0.53mm ID, or 4mm ID packed columns ALL the time, use at least a 60 psi regulator.
best wishes,
Rod