Comment amtetcher SNF 2010-12-06 17:24:45: Bell jar lift needs attention

jimkruger at snf.stanford.edu jimkruger at snf.stanford.edu
Mon Dec 6 17:24:46 PST 2010


The lift has become troublesome. 
To close:
Lower bell jar as usual, but it goes too far such that the black arm may touch the top of the bell jar.  This can cause a bad seal, the roughing will take too long, the foreline will go too high and the Turbo will fault out.
To avoid this, before RUN, tweak the "bell up" until you see daylight between BOTH GAPS:  the bell jar lift flange to lifter,  and the black arm to the top of the bell jar.
It make take several attempts,  opening and re-closing,  it is touchy.
jimkruger




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