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    In light of David Jones' comments, let me modify my statement about
using Pyrex for a sight gauge.  Lots of commercial flowmeters are made with
glass tubes, but the glass sections are very thick-walled, and are enclosed
in a housing.  The housing is usually metal on two sides with polycarbonate
sections screwed onto the front and back.  At the top and bottom there are
usually large metal blocks with O-ring seals to the glass, so the chances of
glass breakage are minimized.  Like anything else, I guess, a glass sight
gauge would have to be carefully engineered.

    Other kinds of plastic tubing would probably work OK.  In Cole-Parmer's
catalog, they list a new Tygon 2075 tubing that is supposed to be OK with "
. . MEK and other highly aggressive chemicals . . .."  Unfortunately, it
only seems to be sold by the 50' roll, which is $80 for the 1/4" I.D. size.

Jim Cameron, ES builder



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