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septum purge shotdown
Posted: Sun Mar 15, 2009 9:47 am
by che313
in agilent 7890 it gives me that the septum purge flow is in negative and could not reach the setpoint which is 3ml/min. what do u think the resone is? the front inlet pressure is 12 psi and the injector temp is 250, the column is hp-5ms, 30m, 25um, 0.25um film and the flow is He 1 ml/min
Posted: Mon Mar 16, 2009 1:13 am
by Consumer Products Guy
What is your split flow?
What is your carrier gas pressure at the cylinder regulator?
Posted: Mon Mar 16, 2009 7:34 am
by Peter Apps
Are you sure that you have the column diameter correct - I would expect 250 um, not 25 um. Then, depending on the column temperature the inlet pressure is too high for the flow rate - check that you have selected the right carrier gas.
Peter