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Guy,

All depend on your work intensity and accuracy. Do not open diff.pump at pressure above specified,? provide right water cooling and heaters power, keep a specified baking pressure and it will work years. Sometimes you need just add a little bit oil. If you see that your diffusion pump losts its pumping speed or ultimate vacuum - check and replace the oil. A good oil must be light yellow or clear. If oil is very dark or black - replace it. If you see a black coated spots inside the pump - your oil is burnt, carefully clean the pump and replace oil.

Roughing pump is the same. There must be a glass window to monitor oil level and its quality. Oil must be transparent (light yellow or light brown). If it is brown and turbid - replace it. If it is dark yellow,? turbid and looks bulbed - there may be a lot of water in the oil, just let it to work a couple hours with opened gas ballast valve to dry the oil. Roughing valve to your vacuum chamber must be closed.

Hope it helps.

Vladimir

On 6/18/2011 2:26 PM, Guy Brandenburg wrote: