Hi
If you are at high field (~600MHz & cryoprobes) you may need to use deuterated
ethylene glycol because of radiation damping
Could this be the problem you are having?
You can also measure temperatures directly by putting a long platinum resistance
thermometer down the bore in a dummy sample of something like glycerol (note
many thermocouples are too inaccurate unless externally calibrated, in which
case they will work as well)
Regards
Gary
--------------------------------------------------------------------
Dr Gary S Thompson
NMR Facility Manager
CCPN CoI & Working Group Member
Wellcome Trust Biomolecular NMR Facility
School of Biosciences, Faculty of Natural Sciences
University of Kent, Canterbury, Kent,
England, CT2 7NZ
tel: 01227 82 7117
e-mail: g.s.thompson_at_kent.ac.uk<mailto:g.s.thompson_at_kent.ac.uk>
orchid: orcid.org/0000-0001-9399-7636
http:/orcid.org/0000-0001-9399-7636
--------------------------------------------------------------------
From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> on behalf of Walter Zhang <wzhang1001_at_gmail.com>
Date: Friday, 18 August 2023 at 20:20
To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
Subject: [AMMRL] 99.8% MeOD vs 80% Ethylene Glycol
Dear All,
I need to use 80% Ethylene Glycol for high temperature calibration.
Before I do the calibration, I compared it with 99.8% MeOD at 303 K.
When I set temperature to 303 K,
99.8% MeOD gives 303.03 K while 80% Ethylene Glycol gives 300.57 K
The difference between the two calibration samples is 2.46 K.
Is this normal?
Your comments are appreciated!
Best regards,
Weixing Zhang
St. Jude Children’s Research Hospital
Memphis, TN 38105
USA
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Received on Fri Aug 18 2023 - 16:44:23 MST