Waters SYNAPT G2 Operator's, Overview And Maintenance Manual page 94

3. Close the source isolation valve by moving its handle counterclockwise,
to the vertical position.
To open the source isolation valve after completing a maintenance
procedure
Warning:
the source enclosure open if one or both of these conditions apply:
• An ESI probe is fitted (the probe tip is sharp).
• A corona pin is fitted (the pin tip is sharp).
5-16 Maintenance Procedures
The source components can be contaminated with
Warning:
biohazardous and/or toxic materials. Always wear
chemical-resistant, powder-free gloves while performing this
procedure.
To avoid puncture wounds, take great care while working with
Isolation valve handle
in closed position
TP03130