FTS systems/cooling unit

PRATUM@UWCHEM.CHEM.WASHINGTON.EDU
Tue, 17 May 94 11:51 PST

We have also considered the FTS systems unit, but do not have one due to
its cost. We use a Neslab Cryocool cc-65 (much less expensive) immersed
in isopropanol to cool a cooling coil through which dry air is run.
This system has been very trouble free, but does not allow the cold
temperatures available from the FTS unit (temperature attainable varies
with the probe used; generally notlower than -20 C). We also have a CC-65
cooling tip in a dewared housing through which the cooling gas is run. This
system appears to allow lower temperatures, but the cooling gas must be much
drier, and our "normal" cooling gas from a Permea NMR air drier ices it up in a
day or so. The FTS systems cooler does seem nice, if you can afford it. I too
am curious if anyone has experience with it.

Tom Pratum
Univ of Washington
pratum@uwchem.chem.washington.edu