My vacuum pressure on my Elan 6000 is 8 x 10-7 before lighting the plasma and it is 1.45 x 10-5 after lighting the plasma. They are all a bit different in the regards of vacuum pressure before ighting the plasma, but they should all run about the same in regards to vacuum pressure while the plasma is lit. 2.2 x 10-5 is a bit higher than I would like to see, but it is still enough to keep the plasma lit. I would check your samle introduction system for leaks (I.e. loose fittings around the torch, bad neb tip o rings, bad ferrules, etc.).