Stephen,
The digital readout value refers to the "Probe reading (mm)" in the
chart. You don't have to wait until it gets to 100 mm. In fact, you
could order a 60L tank and time your refill so you can use all of it.
That would be at around 230 mm (50L transferred and 10L loss). If you
order a 100 L tank, and want to use most of it, that should be at a
probe reading of about 40 mm, which to me is a little too close to the
minimum level. Keep in mind that the probe reading is never 100%
accurate.
Eugenio
Eugenio Alvarado, Ph.D. NMR Facility Director Chemistry Department, room
3500. University of Michigan 930 N. University Ave., Ann Arbor, MI
48109-1055. Voice: (734)-764-9924
On 5/19/25 11:26 AM, Stephen Nolte via groups.io wrote:
>
> Hello,
>
> I’ve been following the notes of our previous technician to perform
> the liquid helium fill when our probe reading is around 100. I also
> found the attached helium probe calibration chart, and I’m wondering
> if I’m performing the helium fill prematurely. Does the digital
> readout value on the probe refer to the “Probe reading (mm)” column or
> the “He level in can (mm)” value? Should I be waiting a little longer
> before the fill?
>
> Thank you!
> _______________________________
>
> Stephen Nolte | Chemistry Technician
> Millersville University
> 717-871-7413
>
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Received on Mon May 19 2025 - 10:08:15 MST