When should the N2 bottle used with the QIAxcel Advanced System be changed?
FAQ ID -3001

N2 cylinders on the QIAxcel Advanced should be changed when one or both low pressure warnings are shown in the "Status Information" panel.

The left panel of the screen in the "Process" environment is called the "Status Information" panel.  

"Pressure 1" status: OK/Low. OK indicates adequate pressure for the sample run. LOW indicates that the N2 pressure is sufficient for the current sample run; however, the N2 cylinder should be replaced once the run has finished.

"Pressure 2" status: OK/Low. OK indicates adequate pressure for the sample run. LOW indicates that the N2 pressure is insufficient for the current sample run and the analysis will not be performed. The N2 cylinder should be replaced.