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Servicing the KNF compressor

Generally this is done by the Oxford technician, during routine maintenance. Service requirements:


Service Frequency
Replace Outer Diaphram Every 8,000 hours or anually.
Replace Inner Diaphram Every 16,000 hours.
System Status Warm.

Procedure:
Remove the KNF Compressor from the circuit:

  1. Collect all mixture. Lock in dumps. Close V14.
  2. Close all automatic valves. Turn off all pumps.
  3. There remains a small amount of mixture in the KNF compressor. So we remove it.
    1. Close manual valve V12. Open manual valve V11.
    2. Turn on forepump.
    3. Open V4.
    4. Toggle V9, watch P5 to make sure the pressure never exceeds 1bar.
    5. Open V9, leave open.
    6. P1 and P2 should go to 0 bar. P5 should be about 700 mbar.
    7. Close manual valve V11.
    8. Turn off forepump.
  4. All mixture should now be closed between V11 and V5.
  5. The KNF is connected to the mixture circuit by two quick release valves. Undo these and be very careful of the tips. Connect them together while KNF is being serviced.
  6. Remove the nuts holding the KNF to the rack.
  7. Remove the KNF.

next up previous contents
Next: Verticalization and Noise Damping Up: Maintenance Previous: Replacing the Impedance   Contents
Jonathan Ouellet 2014-08-26