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GAS-Guard 8 and GAS-Guard 3 Operations and Maintenance Guide
5)
Carefully support the regulator to prevent any damage to the 1/8-in helium line or
regulator.
CAUTION: It is extremely important that no water or other foreign contaminates be
6)
Remove the helium cylinder from its mounting bracket.
Remove the helium dryer from its mounting clips.
7)
8)
Verify the replacement cylinder meets the following specifications:
Chromatographic grade helium
99.9999% pure/Grade (6.0)
Less than 0.2 ppm H
CGA-580 fitting
9)
Position the new helium cylinder in the mounting bracket and secure the cylinder in place.
10)
Reinstall the regulator onto the helium cylinder. Do not use Teflon tape or pipe dope.
Orient the gauge vertically and tighten the CGA fitting.
11)
12)
If necessary, reorient the helium cylinder so that the gauge on the regulator can be clearly
seen.
13)
Install the new helium dryer in the mounting clips. The dryer is not flow directional.
Note: Do not remove the helium dryer plugs at this time.
14)
Verify the helium regulator shutoff valve is closed and slowly turn the valve located on top
of the helium cylinder fully counterclockwise (open).
15)
Slowly turn helium regulator shutoff valve counterclockwise (open) until helium begins to
flow. At this point, gas should be escaping from the stainless steel tubing.
CAUTION: Do not open the regulator shutoff valve completely to regulate the helium flow.
16)
Leaving the helium flowing, remove the top helium dryer plug and attach the free end of
the 10-ft helium line to the top of the helium dryer.
With the helium continuing to flow reinstall the line to the bottom of the helium dryer.
17)
18)
Now turn the regulator shutoff valve fully counterclockwise (open).
19)
Confirm all four helium connections and the helium regulator to helium tank connections
are leak-tight by applying a leak-check solution to the fittings.
Note: The leak check is very important as even the smallest leak can substantially reduce the
The helium regulator outlet pressure is preset at 80psi (5.5 bar), nominal, and requires no adjustment.
allowed to enter the open regulator fitting or tubing.
O
2
life of the helium cylinder.
12 of 18
810-1734-00 Rev A
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