Hey Jessica,
As far as problem number 1. We had a similar situtation. It ended up being
an dirty shim stack. I started with cleaning the spin jets on the top of the
shim stack and this did not solve the problem. I ended up taking the head off
the shim stack and sonicating it in ethanol/methanol and a lot of junk was
dislodged. My hypothesis was uneven airflow pushing the sample slightly off skew.
Problem 2. Sometimes the autosampler does not see the position sensor. At
a previous position I made a little flag for the sensor to recognize a little
easier.
C
________________________________
From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> on behalf of Roberts, Jessica <jroberts_at_ohio.edu>
Sent: Wednesday, July 26, 2023 11:54 AM
To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
Subject: [AMMRL] SampleCase loading errors
Hello everyone!
I have currently been having issues while using the SampleCase autosampler
on my 500 MHz Ascend instrument. There are two major issues that arise:
1. SampleCase fails to load a sample into the magnet. Autosampler will retrieve
the sample, send it up and across and down into the magnet. After a few seconds,
the sample will be ejected (often times by a sound that seems alot like building
pressure in an air line). The sample will then sit with the lift on for a few
seconds before repeating the process. After a few failed attempts the sample will
error out on IconNMR.
2. There is a less frequent issue but I will include it in case it is relevant.
I have seen the SampleCase retrieve a sample from the carousel, lift it to the
top track where it remains momentarily, then it will be sent back down to the
carousel. This typically times out after a few repeatedly failing attempts.
A few notes I will say:
-I am located at Ohio University where it has been quite humid as of late.
My air dryer does not have an autoswitch but I have powered it on today and
intend to run it for a few days to see if it improves things.
-Initial issues were only observed with one ceramic spinner, so I thought it
might be a problem with the old reflective tape. Now it can occur with a spinner
that worked for the previous experiment. In the most recent instance, the loading
error did not occur for a standard proton but for the immediately following standard
proton with rotation.
-It sometimes seems sporadic. A user can submit samples without issues while another
will have problems and it is hard to reproduce as I try to troubleshoot.
-I have not yet had issues with manual sample loading using lift on/off on BSMS
module so I suspect it is autosampler related.
Thanks everyone!
Jessica
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Received on Wed Jul 26 2023 - 13:50:25 MST