Waters SYNAPT G2 Operator's, Overview And Maintenance Manual page 212

To connect the nitrogen gas supply
Warning:
the complete 5-m (16-ft) length as supplied.
1. Connect one free end of the 6-mm PTFE tubing to the API gas in port on
the rear of the instrument.
Mass spectrometer gas and vacuum connectors
Nitrogen exhaust
IMS gas inlet
Collision cell gas inlet
Roughing pump vacuum
connections
2. Attach a nitrogen regulator to the nitrogen supply.
Requirement:
least 95%.
3. Connect the free end of the 6-mm PTFE tubing to the nitrogen regulator.
B-8 External Connections
The 6-mm (¼-in) PTFE tubing must not be cut to size; use
EXHAUST
PUMP RELAY
IMS GAS IN
1 bar
COLLISION
GAS IN
0.5 bar
The nitrogen must be dry and oil-free, with a purity of at
PILOT VALVE
Pilot valve port
API GAS IN
7 bar
Nitrogen inlet
HELIUM CELL
GAS IN
0.5 bar
Helium cell gas inlet