GC-FID random solvent broading

Hi dmarchini,

It looks like solvent hanging around in the inlet. I checked the vapor volume and its good at around 320ul . I do notice that the total flow is below what we recommend for effective use of a split/splitless inlet.  Typically the inlet is happiest at 20ml/min. A couple of things to try , one at a time. Turn on your septum purge , default is at 3ml. If you really need a 10:1 split ,you could also turn on gas saver at 1 minute (or other times as you experiment) which would get the total flow to what we recommend operating the inlet at and help sweep the residual solvent away. Last would be to increase the split to get the total flow up to the 20ml, but you may sacrifice some sensitivity . I hope this helps.

Regards

James

Hi dmarchini,

It looks like solvent hanging around in the inlet. I checked the vapor volume and its good at around 320ul . I do notice that the total flow is below what we recommend for effective use of a split/splitless inlet.  Typically the inlet is happiest at 20ml/min. A couple of things to try , one at a time. Turn on your septum purge , default is at 3ml. If you really need a 10:1 split ,you could also turn on gas saver at 1 minute (or other times as you experiment) which would get the total flow to what we recommend operating the inlet at and help sweep the residual solvent away. Last would be to increase the split to get the total flow up to the 20ml, but you may sacrifice some sensitivity . I hope this helps.

Regards

James

Thanx James, it was right the SEPTUM PURGE, it was unchecked and switched off; now it is enabled and I obtain nice sharp solvent peak.

Thanks!

Glad it is resolved .

Regards

James