Dear Dr. Tsunogai,
  Your original question is still a good one which has not been answered. In
spite of the logic of Bob Dias's reply, confirmed by H-J Schluter, our GCC
III ALSO has capillaries in which the larger outer diameter capillary is the
standard, not the sample. Since our system works well I'm not about to take
it apart right now to confirm this, but perhaps the larger outer diameter
capillary has the smaller INTERNAL diameter of the two?

David Wilbur                      206-685-9288
Stable Isotope Lab             206-685-2366
School of Oceanography   206-685-3351 fax
Box 357940                       [log in to unmask]
Univ. of Washington
Seattle, WA 98195-7940 USA
http://www.ocean.washington.edu/people/staff/dowilbur/dowilbur.html




>Dear Drs. Schl $B]U (Jer and Dias,
>
>Thank you for your kind answers and suggestions.
>I am sorry but I probably made a wrong English translation in my previous
>question.
>
>What I want to ask was concerning to the difference in "diameters" of the
>two capillaries. The lengths of the capillaries were almost the same. In
our
>Combustion III system, however, the diameter of the capillary for sample
gas
>is apparently shorter than that for reference gas. As described by Bob, and
>also in our service manual, shouldn't they be opposite? I guess the
diameter
>of the capillary for sample gas must be longer to get lower split ratio at
>open split for sample measurement. Or I make some misleading again?
>
>Sincerely,
>Urumu Tsunogai
>
>
>
>
>
>
>--------------------------------------------
>Urumu Tsunogai, Dr. Sci.
>Dept. Environ. Science & Technology, IGSSE
>Tokyo Institute of Technology
>4259 Nagatsuta-cho, Midori-ku,
>Yokohama 226-8502, Japan
>Tel. +81-45-924-5555 (or 5554)
>Fax. +81-45-924-5554
>E-mail [log in to unmask]
>---------------------------------------------
>