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What is the difference between a diffusion and a turbo pump ? |
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There is only one big difference between diffusion pump and a rotary pump. One spins at over 70,000 rpm and the other has no moving parts. Each has its own advantages and disadvantages. The turbo pump is very fast pumping down and venting, but is very expensive and when it fails badly it explodes into tiny bits. When it fails "gently" it can be repaired but is expensive and time consuming. There are very few "Good" turbo pump repair companies out there. Make sure you get a warranty. Turbo pumps are very clean and very reliable, but somtimes makes quite a disturbing whine. Diffusion pumps are very simple, a heater - heating a pot of oil, no moving parts. They are slow, but generally can get your system down to a VERY GOOD vacuum. They are much more affordable than turbo pumps, but can cause a very nasty "backstream" (see FAQ) of oil into the mass spec manifold at failure. They are easy to fix, generally very reliable and last a long time.
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