The sample cell is connected to a turbo pump stage and two gate valves can be used to separate the sample from the flight path before and after the sample.

To safely change a sample several steps are necessary as described below:

1) Vent the sample cell

  • Close both gate vales by turning the 'Output' of the HAMEG power supply off
  • Press 'Stop' on the turbo pump touch panel
  • Open the manual vent valve near the sample cell slightly
  • Wait a bit
  • Fully open the manual valve and wait till the pressure is equalized
  • Remove the sample insert and change your sample

2) Pump the sample cell

  • Remount the sample cell insert
  • Close the manual vent valve near the sample cell
  • Press 'Start' on the turbo pump touch panel
  • Wait for the turbo pump to spin up to 90.000 rpm
  • The pressure P3 (yellow bar) on the turbopump display should below 2x10-3 mbar
    • IF NOT, THERE IS PROBABLY A VACUUM LEAK. FIND IT, FIX IT !
  • Open both gate valves by turning the 'Output' of the HAMEG power supply on

Now you are ready to search the hutch...