Maintenance
AVOID INJURY. Never use compressed helium gas from a cylinder without a
proper regulator. Overpressure can cause serious injury if the system
equipment ruptures.
AVOID CONTAMINATION. Follow the charging and venting procedure to
prevent reversed flow of system gas. Do not charge through the supply
coupling. Do not vent through the return coupling. Reversed flow can
contaminate the system with compressor oil.
NOTE
Adapter fittings for charging and venting are available as optional service tools.
See the Parts section of this manual.
Charging Procedure
PRESERVE YOUR WARRANTY. Specifications require the use of 99.999%
pure helium gas. Using a lesser quality of helium can damage the system and
AVOID A MALFUNCTION. Repeatedly charging the system with helium gas
rather than locating and repairing gas leaks can cause a malfunction. Impurities
are introduced at an abnormal rate and can freeze in the cold head.
To charge helium gas to the system:
1. Stop the compressor.
2. Locate charge and vent tool, P/N 267191A, and bleed adapter, P/N 267192A. Screw
bleed adapter into charge and vent tool.
3. Connect the charge line from the pressure regulator of a helium gas cylinder containing
99.999% pure helium with a dew point less than -62° C (-80° F) at 20.7 bar (300 psig) to
Swagelok connector on charge and vent tool, P/N 267191A.
4. Slightly open charge and vent tool's valve and thoroughly purge the charge line from the
regulator. It is important to remove all air contaminants to prevent them from
entering the system.
5. Unscrew the self-sealing coupling on the bleed adapter, P/N 267192A, from the
charge and vent tool, P/N 267191A. Close the valve.
6. Use two wrenches to attach the charge and vent tool to the 4M Aeroquip helium
charge port on the front of the compressor.
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