More Vt problems!
lew cary (lcary@chem.unr.edu)
Tue, 6 Jan 1998 12:07:52 -0800 (PST)
When I walked in Monday, the unity500 had , the day before, toasted a
sample! Overnight, the temp had gone up enough to pop the cap on a cdcl3
sample, and evoporate the solvent, and cover the top of the spinner with
solid sample. With slight cleanup every thing seems normal.
We always run the vt on and at 25C. One probe has an intermittant
with the thermocouple. The cable is wonky, but with care works with all
other probes. The symptom is always the same: the appearent temp. goes to
max., but the sample is not heated.
My question is: how could a thermal runaway have happened? Over
temp shuts off the heated in all cases that I have seen. No one was there
Sunday, of course.
What a great way to start '98, Lew