Tips on Roughing Pressure
Posted: Wed Jul 11, 2018 2:25 pm
It turns out my dual stage 12 CFM roughing pump is only reaching 40 microns at its lowest. I would prefer it to reach at least 15 microns for roughing my diffusion pump. It is only about one year old and doesn't have much wear so it should be capable of achieving close to its rated ultimate pressure of 2 microns. The connection to the pressure gauge when it reached 40 microns was KF sealed and seemed leak proof but I can double check this. I also replaced the oil and cleaned out old dirty oil in the box holding the motor.
Is the oil I'm using good enough for the roughing pump? It is Mobil 1 vacuum oil, picture attached below. What else can I do to get lower roughing pressure?
Is the oil I'm using good enough for the roughing pump? It is Mobil 1 vacuum oil, picture attached below. What else can I do to get lower roughing pressure?