Adding Helium Gas - HELIX 8200 Operating And Service Instructions

Maintenance Procedures

Adding Helium Gas

4-4
4. Helium charging line terminating in a 1/4-inch female flare fitting,
P/N 7021002P001.
5. Installation and Scheduled Maintenance Tool Kit, P/N
8032040G004.
*Available from stock; consult the factory or your sales representative.
Use only 99.999% pure helium gas.
If the compressor helium pressure gauge reads 0, decontamination is
required. Refer to decontamination procedures under, Helium Circuit
Decontamination, or contact the Product Service Department.
1. A User-supplied helium charging line terminating in a 1/4-inch
female flare fitting, and a two-stage pressure regulator rated at
0-3000/0-400 psig is required for this operation.
2. If you need to add helium more than once every several months,
check for leaks caused by improperly connected self-sealing con-
nections or any mechanical joint within the compressor.
There are two conditions that require the addition of helium gas:
1. Compressor not operating; helium pressure gauge reads 245
psig or below.
2. Compressor operating; helium pressure reads 270 psig, or below.
To add helium gas:
1. Attach a pressure regulator (0-3000/0-400 psig) and charging
line to a helium gas (99.999% pure) bottle. DO NOT OPEN
THE BOTTLE AT THIS TIME. Purge the regulator and
charging lines as instructed in steps a through e below. Do not
use helium gas that is less than 99.999% pure.
a. Open the regulator a small amount by turning the adjusting
knob clockwise until it contacts the diaphragm, then turn
approximately 1/8 to 1/4 turn more, so that the regulator is
barely open.
b. Slowly open the bottle valve, and purge the regulator for 10
to 15 seconds. Turn the regulator knob counterclockwise
until the helium stops flowing.
CAUTION
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C TI CRYOGENICS
HELIX TECHNOLOGY CORPORATION
P/N 8040353