655 Dry Pumping Station

655 Dry Pumping Station

Excellent high-resolution performance
The Model 655 is a completely self-contained, compact, light-weight, benchtop pumping station. It incorporates the latest diaphragm pump and molecular drag pump technologies to produce a clean, dry vacuum in the low 10-6 Torr range. Pumping times from atmosphere to near the base pressure are typically less than 2 minutes, the pressure being monitored by a simple, reliable Penning guage.

Applications include:
• Removing condensed water from cold holders

• Evacuation of dewar-type cryotransfer holders

• Testing the operation of heating holders

• Storage of specimens under vacuum

• Testing vacuum transfer holders and evacuating helium transfer lines

The dry pumping system will not contaminate the zeolite traps used in Gatan cold holders, even when the dewar is filled with liquid nitrogen. The specimen holder, drag pump and workstation remain under vacuum when the power is switched off. Unlike many dry pumping systems, it can be restarted from the evacuated state, enabling the ultimate vacuum to be achieved within minutes of restarting.

Specimen Holder Workstation
The pumping station has been designed for evacuating and leak checking specimen holders from all types of TEMs. Tilting and heating operations can be viewed through a pyrex glass work chamber while the specimen is under vacuum. Two large butterfly valves are provided so that it is possible to isolate either the specimen rod or the pumping port, normally used for dewar evacuation.

Up to 3 additional specimen holder adapters may be added to the workstation. The third and fourth adapters require a second pumping port.