Maintenance
Figure 2 Break Gas Line Connection Figure 3 Disconnect Gas Line
from Compressor from Compressor
Disconnect from the Cold Head
Tools required: Open-end wrenches
1. Always use two wrenches. Use one wrench to hold the cold head coupling. Use the second
wrench on the gas line coupling nut to break the connection. See Figure 4.
2. After breaking the connection, hold the coupling adapter with one wrench. Remove the gas
line coupling from the cold head coupling with the second wrench. See Figure 5.
3. Screw a dust cap finger tight on to the cold head coupling.
Figure 4 Break Gas Line Figure 5 Disconnect Gas Line
Connection from Cold Head from Cold Head
Leak Check
Leakage of helium gas is the only likely problem to originate on a gas line. Use of a helium
mass spectrometer leak detector is recommended. If no mass spectrometer is available, a
liquid leak detector solution may be used on the coupling joints.
With the gas lines connected to the compressor and to the cold head, leak check the connected
coupling joints.
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