Back-Streaming Diffusion Oil

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Dennis P Brown
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Joined: Sun May 20, 2012 10:46 am
Real name: Dennis Brown

Re: Back-Streaming Diffusion Oil

Post by Dennis P Brown »

I agree with Rich - something is wrong; either the operation, the set up or the pump. To start isolating the problem, first off, do the test I suggested and determine if the roughing pump is even operating properly - certainly you should get below 70 microns. Getting just 70 microns with no load is not acceptable for a system meant to run a DP. That is very poor. If the test again gives just 70 microns pumping only on the gauge either - 1) the roughing pump oil is no good and/or contaminated or 2) The roughing pump isn't meant to achieve a lower vacuum or 3) leaks somewhere that is causing this high reading, or 4) your gauge is off (is oil in the detector head, maybe?)
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