Dear AMMRLers,
we just had a weird glich in th etemperature contol of our Bruker
DRX500 spectrometer. I was called by a user that the temperature
reading was 600K with a set temperature of 298 K and that the sample
was really hot. When I came down I saw temperature reading of 345 K
continuously dropping towards the 298K set temperature. While I was
watching I saw the temperature reading several times momentarily
jumping up to above 400K and back to a reasonable reading.
Eventually the temperature settled down around 298 K again, and I
could not see any more fluctuations. But it appears to me that there
might be some glitch in the temperature control and it might happen
again with a precious sample inside.
While I have seen outrageous readings whe the wrong temperature
sensor was defined (Thermocouple T vs. BTO2000) this was not the case
here. The user said he did not touch the temperature unit and it was
set to hold 298K.
Has anybody experienced a similar problem before ?
Thanks for any advise
Holger Foersterling
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Frank Holger Foersterling, Ph. D.
Director of NMR laboratories
Department of Chemistry, University of Wisconsin-Milwaukee
http://hal.chem.uwm.edu/nmr/
(holger_at_uwm.edu)
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Phone:(414)-229-5896
Fax:(414)-229-5530
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Received on Thu Apr 21 2005 - 08:48:38 MST