Hi Amanda,

How much variation are you seeing? If our syringe is dormant for more than 
an hour, we do a rinse routine programmed into the PAL to simulate several 
hundred injections. Sometimes this helps. We too see errant injection 
volumes on occasion and I never really am convinced its one thing or 
another. My suggestion is to keep it running, keep the syringe clean, keep 
the septum fresh (we use an old needle to make certain all injection port 
parts are aligned...not sure that helps either). I also suggest looking at 
the .lgr file. Keep track of RDTau (ring down time) and FitCoeff18 
(closely related to cell pressure). These might allow you to tell if its 
septum leakage or actual injection volume variation. Good luck.

andy

Andrew Schauer
Earth and Space Sciences
University of Washington
Seattle, WA 98195

206.543.6327
[log in to unmask]
http://depts.washington.edu/isolab/

On Tue, 6 Apr 2010, Amanda Kern wrote:

> I am having problems with the injected volume on a Los Gatos Research Liquid
> Water Analyzer.
> Already tried the following: 
> -replaced the syringe
> -begin each run with injections of nanopure sample
> -clean/rinse syringe with nanopure between each run
> -replaced septum
> -replaced septum support
> -sent data output to LGR (they said it looks fine)
> 
> Has been suggested I try rinsing with an acid mix but if a new syringe
> doesn't make a difference I am not ready to invest in anything but a proven
> solution.
> 
> I am at a loss. Any suggestions would be appreciated. 
> 
> Thanks,
> Amanda Kern
> [log in to unmask]
> 
> 
>