User's Manual Rev B / February 2021 / M125 Helium Compressor
97-00020-000
12
5.2.6
Filling the Compressor with Helium Gas
Caution:
All safety regulations related to handling pressurized gas cylinders must be observed. Only use helium
with 99.999% or better purity when performing refill operation.
Follow these steps:
1.
Connect a pressure reducer and a helium flex line to a helium supply gas cylinder
2.
Connect the open end of the helium flex line to the helium gas charge/vent valve on the rear panel of the unit; do
not tighten the 1/4” flare connector on the end of the flex line
3.
Open the valve at the cylinder
4.
Set the pressure of the helium supply cylinder to the value specified in Table 4-3. Tighten the 1/4” flare connector
on the end of the helium flex line to the gas charge/vent valve of the compressor
5.
Open the pressure regulator valve slightly so that the helium flex lines are purged with helium gas for at least 15
seconds.
6.
Open the helium gas charge/vent valve and fill the compressor unit to the desired pressure value
7.
Detach the coupling of the helium flex line from the helium charge/vent valve
8.
Close the helium gas regulator on the supply cylinder
9.
Seal the helium gas charge/vent valve on the compressor unit by properly securing with a protective cap.
5.2.7
Adjusting Helium Gas Pressure
Refer to Table 4-3 for the required pressure specification of the compressor unit. If the pressure falls below that level, the
helium gas refill procedure described in Section 5.2.6 needs to be performed. On the other hand, if the pressure is too high,
then the helium gas needs to be released in order to maintain the proper level.
Caution:
If the compressor pressure drops over a period of time, either when not in operation or without the
lines being connected/disconnected, this may be an indication that there is a leak along the helium
circuit (i.e., compressor, lines or cold head/cryopump). If that is the case, do not just keep refilling the
system with helium gas. Such leaks will introduce ambient air/moisture and cause contamination in
the helium stream. This will result in catastrophic failure of the whole cryogenic system if not properly
addressed. Contact and report the leak to Trillium US Inc. immediately using the contact information
found in Section 2.2.
