810-1734-00 Rev A GAS-Guard 8 and GAS-Guard 3 Operations and Maintenance Guide
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Maintenance
The Siemens GAS-Guard has been designed to keep maintenance to a minimum. The following will
help you determine the best service plan.
Helium and Verification Gas
Helium Gas
The helium gas cylinder will last greater than four (4) years based on the default four hour sampling
interval. It is important that the gauge on the regulator be checked quarterly and a leak-check solution
applied to fittings biannually to ensure no leaks have developed. The helium cylinder should be
replaced when the pressure gauge reads less than 150psi (10.34 bar).
Helium Dryer
The helium dryer will last greater than four (4) years based on the default four hour sampling interval.
A leak-check solution should be applied to the helium dryer fittings bi-annually to ensure no leaks
have developed. The helium dryer should be replaced when the helium cylinder is replaced.
Helium Cylinder and Dryer Removal and Replacement
WARNING: When full, the helium cylinder is pressured to greater than 2000psi (138
bar). Helium is regulated to 80psi (5.5 bar), nominal, before entering the GAS-Guard,
Always follow Compressed Gas Association (CGA) guidelines when handling and
transporting compressed gases.
CAUTION: Use of helium other than 99.9999% pure research or chromatographic grade
with less than (0.2 ppm) H
2
O content will VOID the GAS-Guard warranty.
1)
Turn off power to the GAS-Guard by opening the GAS-Guard door and toggling the power
switch located in the upper right hand corner to the OFF position.
2)
Turn the helium cylinder valve clockwise to the fully OFF position.
3)
Using a 7/16-in wrench, remove the 1/8-in helium inlet and outlet lines from the top and
bottom of the helium dryer.
WARNING: A small amount of high-pressure helium will be released upon loosening
the fitting.
4)
Using a suitable wrench, remove the helium regulator from the cylinder valve.