Pump was never broken!

16 02 2011

All photos.

Previously I though I had broken my pump.

So the pump is back from repairs. But the strange thing is when Pfeiffer received it, they said it was working fine! Although I did manage to knock the rotor out of balance and it needed fresh oil.  Here is the pump capped with a blank conflat running at full speed. GOOD.

But the problem was never the pump! The problem is a gross leak in the vacuum chamber.

Once I attach the pump to the chamber, the pump won’t spin up… indicating a gross vacuum leak.

The copper gaskets are all new, and I even got the torque wrench out to make sure the conflats were tight enough.

I can’t hear any hissing.

How do I troubleshoot this…

Here is a good overview on leak detection.

 

UPDATE:

I though I head a hiss near the bellows. So I tested just the bellows and it’s working fine. So the leak is somewhere in the chamber.

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