Hi Bob,

Most likely either the Orings on the plunger driver wheel or the wheel itself is worn.

I can also be the center bearing is too loose. For that remove the tray and spin the brass center piece with your fingers. It should come to a smooth and relatively prompt stop. If it spins freely tighten the hex bolt a little and try again.






Nick Collins

Elemental MS

12430 N Dowling Rd

College Station
TX 77845

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From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Michener, Robert H
Sent: Thursday, May 12, 2016 9:29 AM
To: [log in to unmask]
Subject: [ISOGEOCHEM] Eurovector solid autosampler issue


Hi all,


I’ve got a problem with our Eurovector solid autosampler.  Basically, it’s dropping 2 samples at once and it occurs twice during an overnight run.  It’s happening roughly at the same spot in the carousel.  I have the metal carousels and it seems to happen on both the bottom and top trays.  I’ve looked at the obvious:  cleaned the trays, replaced the ratchet gear, and cleaned the piston.  I have a brand new motor as well.  It’s been frustrating, especially when I have to go into the spreadsheet and fix the sample order…not to mention lost samples.


Any suggestions would be appreciated!







Robert Michener

IRMS Laboratory Manager

Boston University Stable Isotope Laboratory

Department of Biology

5 Cummington Mall

Boston, MA  02215


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