Hi Ken,
What's the BCU set to? If it's not set to Maximum I wouldn't expect it
to get much below 0C. Is it actually running? Can you disconnect
the BCU trunk line from the adapter going into the probe and see if it's
putting out cold air? If you've got some way to measure the temperature
of the gas that's coming out, that would be an indicator of if the BCU is
cooling sufficiently or not. And you might have a look at the emergency
vt connector on the side of the adapter that plugs into the bottom of the probe.
There should be a one-way valve connected to that so if there's nothing connected
to it, the VT gas can't escape through there. If that is present, you might
disconnect the emergency VT gas line just to be sure that's not set so high that
it's preventing your sample from cooling.
Cheers,Mike
On Friday, January 16, 2026 at 01:40:43 PM MST, Kenneth Sharp-Knott via groups.io wrote:
Dearest wizards of AMMRL,
Previously I was using a room temp BBO probe and it would cool quite quickly
to -25 to -30C with the same setup. We've recently had our long
awaited Prodigy installed and now it won't get below -5C (corrected) with
the VT gas up to 800 lph.
Further details: I have a BBO Prodigy with a BCUII chiller. My air is
dried to -80C dew point and flows through a nitrogen separation membrane to
provide VT gas.
Any suggestions?
Thanks
Ken Sharp-Knott
Manager of Analytical Services and the NMR Facility
Department of Chemistry
Virginia Tech
(540)267-6502 (Cell)
(540)231-0885 (Office)
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Received on Fri Jan 16 2026 - 13:07:05 MST