Edwards nEXT85 - Pump Checks; Clearance Check; Vacuum Leak Check; Operational Checks

Pump checks
WARNING:
Ensure the pump is electrically isolated before performing any manual checks.
Before running the pump, carrying out a number of checks is recommended. These checks
are designed to ensure that the pump is in the best possible health with the limited test
equipment that may be available.
Clearance check
The
rst check ensures that the rotang and stac parts are sll in clearance. This can only
be performed before installaon.
Using the end of a pen for example, carefully rotate the rotor. While the rotor is spinning
listen out for any clashing between the rotang and stac parts. Ensure the rotor spins
freely. If the rotor does not spin freely, contact your supplier.
Figure 15
Clearance check
Vacuum leak check
For a helium leak detector, leak checking the pump on the system against the specied
system leak rate is highly recommended.
Operaonal checks
Refer to the Operaon secon of the nEXT85 pump instruconal manual B8G0-00-880.
B8G2-00-840A - Service
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