Accessories
Pumpout/Nitrogen Purge Adapter
Tool required: 9/64" Hex key wrench
Installation Procedure: Slip a new copper gasket over the tube extending from the adapter.
Insert the tube into the appropriate utility port and gently work the tube through a hole in the
first-stage cryopanel. This will allow the adapter’s flange to mount to the utility port. Use a flat
washer and lock washer with the #8-32UNC x 5/8" long hex socket head cap screws. Tighten
them into the tapped utility port flange with the wrench.
Silicon Diode or Hydrogen Vapor Bulb Temperature Sensor
Tools required: 9/64" Hex key wrench
7 mm Combination wrench
4 mm Hex key wrench
Medium flat-blade screwdriver
Bent tip needle nose pliers
Installation Procedure:
1. Remove the inlet louver and both cryopanels following the procedure in the Maintenance
section.
2. Remove the old copper gasket. Slip a new copper gasket over the end of the temperature
probe.
3. Feed the sensor probe through the utility port into the cryopump enclosure.
4. Remove the screw from the sensor probe. Insert the screw through the countersunk hole on
the face of the cold head’s second-stage heat station. (Diode assemblies for use with a
Marathon Cryopump Controller have two diodes. Attach the shorter diode to the first-stage
heat station. Attach the longer diode to the second-stage heat station.)
5. Slip the small indium gasket over the protruding length of the screw.
6. Bring the copper sensor mounting block off the sensor probe to meet the screw and thread
the screw into the probe. Hold the probe with the needle nose pliers. Tighten the screw into
the probe using the screwdriver. Make sure the indium gasket is crushed between the
probe block and the cold head heat station.
7. Reinstall the cryopanels and the inlet louver following the procedure in the Maintenance
section.
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