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Hi all,
My Costech is losing oxygen somewhere and I can't find the leak. I am set up to run carbon and nitrogen and the oxygen is only used during sample combustion. I am slowly losing oxygen even in standby mode. I have replaced the regulator at the tank and leak-checked the whole line and the external and internal connections to the device regulator. Could there be a problem at the Costech oxygen regulator? Has anyone experienced this problem before?

Thanks,
Suzanne Ankerstjerne

Iowa State University
Stable Isotope Lab
Ames, IA