Cryomech PT415, Installation, Operation And Routine Maintenance Manual

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Installation
6-3
3. The return line has a larger diameter near the Re-liquefier Main Assembly at the
bend radius and a smaller diameter to insert into the fill port (see Appendix A).
To reduce the transfer losses in the liquid return line, the distance between the
larger diameter and the return line sealing gland of the fill port should be less
than 1”.
4. After the fill port is inside the cryostat, attach the helium vapor Line to the
cryostat and to the Re-liquefier Main Assembly. The helium vapor line is a 6 mm
flexible line and shipped as a separate component. For optimum performance
the helium Vapor Line should connect to the cryostat instrumentation neck so the
helium vapor can be used to cool leads and shield according to the original
design of the Dewar. The line comes with a an o-ring fitting to connect to the
Re-liquefier Main Assembly and a needle valve. Cryomech has supplied the
other end of the vapor line with an o-ring fitting and a 1/4 MNPT adapter fitting to
connect to your dewar/cryostat. Confirm that the physical space containing the
compressor package has an ambient temperature in the range 45 to 100

F (7 to
38

C).
6.3 Connecting the Temperature Monitor
The instrumentation cord connects the temperature sensor to the temperature monitor.
The cord is completely wired and ready for use, as is shown in Figure 6-3.
Figure 6-3: Instrumentation Cord
1. Attach the female 10-pin connector to the male 10-pin receptacle on the
Reliquefier Main Assembly.
2. Attach the male DB15 connector on the cord to the female DB15 connector on
the back of the SCM10 temperature monitor See Figure 6-4.
3. Refer to the temperature monitor manual for start up and operation instructions.
Connect 10-Pin
to Reliquefier
Main Assembly
Connect
DB15 to back
of SCM10
Temperature