Bio-Rad PDS-1000 / He™ and Hepta™ Systems - Manual (Page 47)

Aspects unique to the metal chamber design
• Metal bombardment chamber.
• Top slots of the metal case. These are used only for the target shelf placement when using
gunpowder acceleration system.
• Door construction:
Gasket design changed. Portions removed that were dedicated to use with gunpowder
acceleration.
Door brace added in plastic case design for additional safety.
• External vacuum filter assembly components. Located on rear and side of metal case unit.
These components are used to trap spent gunpowder in thin oil film inside trap after bom-
bardment. See rear view (Figure 8.2) for identification of components.
• Helium tubing-stainless steel in metal case version. Composed of PEEK plastic in the
plastic case version.
• Power cord is permanently attached in the metal case design. Power cord is detachable in
the plastic case design.
Attachment/removal of vacuum filter assembly for the metal case PDS-1000/He unit
Fig. 8.2. Rear view of metal case version of PDS-1000/He system.
Wrap PTFE tape on the threaded brass vacuum filter fitting on the rear of the PDS-1000/He unit
and attach the filter assembly (Figure 8.2). The vacuum filter assembly includes a plastic filter hous-
ing and brass filter hose fitting, plus the Tygon tubing. Turn the filter assembly approximately four
complete turns, ending so the filter housing is parallel to the unit and the Tygon tubing is facing upward.
Push the open end of the Tygon tubing onto the baffle located on top of the PDS-1000/He unit.
Note: The filter assembly must be firmly supported as the Tygon tubing is being pushed
onto the baffle on top of the unit (or onto the brass filter hose fitting) to avoid cracking the
plastic filter housing.
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Tygon Tubing
Filter
Assembly