HELIX CTI-CRYOGENICS CRYO-TORR 100 Installation, Operation And Servicing Instructions page 22

4.3 Connecting Purge Gas
Connect your purge gas supply to the purge gas heater
and purge valve. Adjust the supply pressure to operating
pressure of 40 psig minimwn and a maximwn operating
pressure of 100 psig maximum, this will allow for the
desired purge gas flow rate for the most efficient regen-
eration.
4.4 Connecting a Vent Pipe
The cryopump pressure relief valve (shown in Figure
1.2) may be vented directly into the room or can be
connected to a vent pipe.
AWARNING
• If toxic, corrosive, or flammable gases are
pumped, a vent pipe must
be
connected to the
cryopump relief valve and directed to a safe
location.
• When connecting a vent pipe to your cryopump,
a 1.30 inch diameterx 1.3S inch long volume
around the relief valve must remain open.
(Vent pipe adapters are available from
CTI-CRYOGENICS (CTI
PIN
SOS0250KOOS).
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4.5 Connecting the Cryopump to
the Compressor
Make the connections between the cryopump and
compressor. Refer to Figure 3.2, page 3-3, while making
the component interconnections.
I. Remove all dust plugs and caps from the supply and
return lines, compressor, and cryopwnp. Check all
fittings.
2. Connect the helium-gas return line from the com-
pressor helium-gas return connector to the helium-
gas return connector on the cryopump.
3. Connect the helium-gas supply line from the com-
pressor heliwn-gas supply connector to the helium-
gas supply connector on the cryopump.
4. Attach the supply and return line identification
decals (CTr supplied) to their respective connections.
5. Verify proper helium static pressure by confmning
that the heliwn pressure gauge on the compressor
reads 245-250 psig (1690-1725 kPa) in an ambient
temperature range of 60 to lOO"F (16 to 3S°C).
If
the indicated pressure is higher than 250 psig (1725
kPa), reduce the pressure as follows:
1. Remove the flare cap from the gas charge fitting
located on the rear of the compressor.
2. Open the gas charge valve very slowly. Allow a
slight amount of helium gas to escape until the
helium pressure gauge reads 250 psig (1725 kPa).
3. Close the gas charge valve and reinstall the flare
cap.
If the indicated pressure is lower than 245 psig,
(1690 kPa), add helium gas as described in Section 7.4,
page 7-2.