2-30 Installing the System
2. Connect the other end of the vent tube to an eluent filter (see the figure
“Solvent reservoir filter and diffuser placement” on page 2-28).
3. Place the filter end of the vent tube in a fume hood.
4. Insert the solvent reservoir cap into the top of the reservoir.
5. Repeat steps 1 to 4 for each solvent reservoir.
Connecting a helium tank to the fluid handling unit
This section describes how to connect a helium tank to the fluid handling unit.
Tip: The system does not include the high-pressure gas regulator required to
connect the sparge inlet to a helium tank. The Startup Kit includes the shutoff
valve, tubing, and other fittings for connecting the sparge inlet to a 50 to 90
psi helium supply.
Helium sparging reduces the total dissolved gas in the solvent reservoirs and
maintains that condition during operation. Use an ultra-pure carrier (UPC)
grade of helium to prevent solvent contamination.
Helium specifications
Regulate the supply source to between 50 and 90 psi (3.4 and 6.1 atm) before
connecting to the sparge inlet connection (see the figure “Sparge gas inlet
connection” on page 2-33).
The required specifications for UPC-grade helium are as follows:
• Less than 5.0 Mppm (molar parts per million) nitrogen
• Less than 5.0 Mppm oxygen
• Less than 1.0 Mppm total water
• Less than 0.5 Mppm total hydrocarbon
Caution: Using an inferior grade of helium can void your system’s
warranty.
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