Vacuum Chamber
Link to CAD and other information about vacuum chamber
If the Pfeiffer 80 Eco turbo pump stalls out at ~1 torr even with diaphragm and turbo on, there is water in the system. Per the manual section 6-4:
Turn off the pump
Set [030]: ValveMode to 2 to open the ballast valve manually
Turn pump on again and let run for 15 mins to remove condensate from the diaphragm pump.