User's Manual Rev B / February 2021 / M125 Helium Compressor
97-00020-000
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Caution:
Loosening or detaching helium flex lines with the compressor load at low temperature without proper
warming-up can result in loss of helium and/or pressure rise in the cryopump unit beyond its designed
maximum pressure level.
When transporting the compressor unit, follow these guidelines:
•
Make sure the appropriate protective caps are properly secured before shipping.
•
Always store the compressor unit in a dry place. Refer to Table 4-3 for proper storage environment.
•
If a freezing temperature environment is anticipated whether during shipping or under storage, make certain the
coolant in the compressor circuit is properly drained.
Caution:
The compressor unit should never be tilted more than 45 degrees either during shipping or in storage.
8.3
Scheduled Preventative Maintenance Activity
The only scheduled maintenance required on the Model 125 compressor is the replacement of compressor adsorber after
every 15,000 hours of operation as indicated on the compressor elapsed time meter or every three years (whichever comes
first). When the compressor is used with 50 Hz power, the actual elapsed time will be 1.2 times of that shown on the
meter.
The adsorber is used to keep the oil vapor out of the helium gas in the flow circuit of compressor unit and its load. After
about 15,000 hours of operation (or every three years, whichever comes first), the effectiveness of the adsorber will
decrease. It will then need to be replaced. Otherwise, the oil particles could accumulate on the cold surface of the
compressor load, reducing the cooling performance of the overall system. In severe cases of such oil contamination, the
load (cryopump, cold head, etc.) could cease to function completely.
To remove and replace the compressor adsorber, follow the steps described in Sections 8.3.1 and 8.3.2
Caution:
Use only Trillium US Inc. supplied adsorber for replacement. Refer to Section 4.3 for part number.
8.3.1
Remove the Compressor Adsorber
To remove the compressor adsorber:
1.
Turn off the compressor.
2.
Use the two wrenches supplied with the Installation Kit to avoid loosening the body of the coupling from its
adapter. Hold one wrench tight on the coupling half attached to the rear side of the compressor. Use the other
wrench to loosen the coupling to the helium supply line.
3.
Unscrew the two self-sealing coupling halves quickly to minimize minor gas leakage.
4.
contains an illustration of the self-sealing couplings.
5.
Remove the top cover.
6.
Remove the adsorber from the compressor as shown in Section 8.3.1. Save all nuts, bolts, and washers for
installing the replacement adsorber.
7.
The removed adsorber can be returned to Trillium US Inc. for credit. Section 2.2 provides the contact information.
8.3.2
Install Replacement Adsorber
To install the replacement adsorber:
1.
Remove the dust caps from the self-sealing coupling halves at each end of the replacement adsorber.
2.
Check the self-sealing connector flat rubber gasket to make sure that it is clean and properly positioned.
3.
Place the adsorber back in the compressor using the nuts, bolts, and washers set aside during the removal process
described in Section 8.3.1.
4.
Install the two self-sealing coupling halves quickly to minimize minor gas leakage.
5.
Use the two wrenches supplied with the Installation Kit, holding one wrench tight on the coupling half attached to
the rear side of the compressor. Use the other wrench to tighten the coupling to the helium supply line.
