My $0.05 would be to get a changeover regulator with 4x bottles of gas linked together on one side, and a single bottle (or dewar when you know you'll want and use one) connection point on the other side.
4 gas cylinders (all taps open simultaneously) should be plenty for extended running from one day into the next, and then there's always at least another 6-7h 'in reserve' on the other side of the switching regulator so you can run the main four as empty as possible before changing them out.
Best of luck,
Elemental Scientific | Canada www.icpms.com
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From: Carson, Mary C [mailto:[log in to unmask]]
Sent: Tuesday, June 12, 2018 1:00 PM
Subject: Re: Looking for recommendations for a changeover manifold for a 1 ICP-MS lab
Yes, I was thinking of your lab setup--Megan Mekoli told me you were strictly cylinders. Does your system include any sort of purge valve to use when switching argon sources? I currently use just a simple T with cutoff valves for 2 sources, but there must be a slow leak someplace since the plasma invariably goes off when I open a valve, even when the second tank is already hooked up.
I do do overnight speciation runs, so dewars are nice then. The issue is I can go weeks without using the ICP-MS. Since the dewars loose so much to venting, I also keep cylinders around. It would be nice if I could limit buying liquid argon to those times when I KNOW I will be using it, and just have cylinders for the rest of the time.
Mary C. Carson, Ph.D.
Center for Veterinary Medicine
Office of Research, Division of Residue Chemistry U.S. Food and Drug Administration
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