Waters Xevo G2-XS QTof Overview And Maintenance Manual page 6

Spilled solvents hazard
Prohibited:
solvent, do not place reservoir bottles on top of the instrument or on its
front ledge, unless in the bottle tray provided.
Flammable solvents hazard
Warning:
enclosed space of a mass spectrometer's ion source, ensure that nitrogen
flows continuously through the source. The nitrogen supply pressure
must not fall below 400 kPa (4.0 bar, 60 psi) during an analysis
requiring the use of flammable solvents. Also a gas-fail device must be
installed, to interrupt the flow of LC solvent should the nitrogen supply
fail.
When using flammable solvents, ensure that a stream of nitrogen
continuously flushes the instrument's source, and the nitrogen supply
pressure remains above 400 kPa (4.0 bar, 60
gas-fail device that interrupts the solvent flowing from the LC system in the
event the supply of nitrogen fails.
vi April 2, 2015, 715004496 Rev. B
To avoid injury or equipment damage caused by spilled
To prevent ignition of flammable solvent vapors in the
psi). You must also install a