You are never going to use the instrument 24/7/365.
Consider a target for amount of usage to be 100%.
Some ideas, take them as you will.
Automated instrument – consider –
Downtime due to
* Maintenance, PM, testing, cryogens, pulling the probe due to dirty samples,
dusting off the magnets
* Changing the probe
* Automation failure (software issues, mechanical such as loss of sample,
sample not put in carousel properly, clean up, hangup – include
time necessary for capable party to fix issue, so it could be down for over
night or several days before the issue can be dealt with)
Include acquisition overhead – are you counting experiment time or
the total time for inserting sample, shimming, eject, etc.
Can (or will) users load up samples over weekends/holidays?
Also – the more use, the larger potential for something going wrong
(of course on a Friday night before all the people who can fix anything are
going to a week long conference or on holiday!)
Historic numbers or estimates of the above can help the calculation.
Also consider a small “catastrophic” event perhaps once a year –
such as a board going, what kind of turnaround is usual to fix?
Small event – something like a quench or multiple board failures would be
a whole different story, perhaps rare enough not to consider.
You could consider the entire year and subtract out above considerations.
You could consider workdays only ~220 (or something similar), chop off some
time for the down factors (maybe 20 days?) and assume the rest of the days
is a solid 24/7 for 100%.
And you could pull the ICONNMR_F files (assuming it wasn’t reset)
and see historically what actual maximum usage has been to get a handle –
at some point the instrument must have been used to the max(?).
Cheers
George
George Sukenick, Ph.D.
Associate Lab Member/Head
NMR Analytical Core Facility
Sloan Kettering Institute
Memorial Sloan Kettering Cancer Center
417 E. 68th St ZRC 2164
New York., N.Y. 10065
Main: (+1) 646-888-2237
g-sukenick_at_ski.mskcc.org<mailto:g-sukenick_at_ski.mskcc.org>
> From: <main_at_ammrl.groups.io> on behalf of Kenneth Sharp-Knott <kknott_at_vt.edu>
> Reply-To: "main_at_ammrl.groups.io" <main_at_ammrl.groups.io>
> Date: Tuesday, November 7, 2023 at 12:52 PM
> To: "ammrl_at_groups.io" <ammrl_at_groups.io>
> Subject: [EXTERNAL] [AMMRL] Measuring instrument use/capacity
Assuming an instrument (with automation) at 100% capacity is used 24 hours
a day, what is a heavily used instrument? We are trying to justify updating
an older - heavily used instrument - but when looked at from this statistic,
it's only
Assuming an instrument (with automation) at 100% capacity is used 24 hours
a day, what is a heavily used instrument?
We are trying to justify updating an older - heavily used instrument - but
when looked at from this statistic, it's only averaging about 30% of it's
theoretical capacity. Do you exclude weekends bumping this value to an average
of 40% use?
Another option is # of samples run/day which is really hard to measure and
perhaps is an even worst statistic.
Curious on how you manipulate these numbers and what you consider to be a
'heavily used' instrument.
Best
--
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 Tue Nov 07 2023 - 12:45:45 MST