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Subject: Re: Backstreaming problem

Date: 11/08/01 at 4:33 PM
Posted by: Vladimir Tchoutko
E-mail: chutko@earthlink.net
Message Posted:

In Reply to: Re: Backstreaming problem posted by Anneleen De Smet on 11/08/01 at 5:52 AM:

No problem.

Model Input Pumping speed B/streaming
flange Dia l/s mg/cm2/min

VARIAN
AX-65 NW50 90 less than 0.0002
HS-2 ASA2" 285 less than 0.0010
M-2 ASA2" 175 less than 0.0010
M-4 ASA4" 800 less than 0.0001
VHS-4 ASA4" 1200 less than 0.0005
M-6 ASA6" 1500 less than 0.0001
VHS-6 ASA6" 2400 less than 0.0005
VHS-250 ISO250F 3700 less than 0.0005
VHS-10 ASA10" 5300 less than 0.0005
HS-16 ASA16" 10000 less than 0.0015
HS-20 ASA20" 17500 less than 0.0015
HS-32 ASA32" 32000 less than 0.0007
NHS-35 ASA35" 50000 less than 0.0005

Water cooled baffle decreases backsreaming
to the level abouit 10-5 ... 10-7. Cryo baffle -
to the level about 10-7 - 10-8.
Source: VARIAN Product Catalog 2000.

How do you measure backstreaming?

Regards,

Vladimir Tchoutko


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