Waters Xevo TQ MS Operator And Maintenance Manual page 160

3. Connect the free end of the 6-mm PTFE tubing to the nitrogen regulator.
Requirement:
least 95%.
4. Set the nitrogen regulator to 600 to 690 kPa (6.0 to 6.9 bar, 90 to 100
psi).
C-14 External Connections
The nitrogen must be dry and oil-free, with a purity of at