We recently purchased a Gerstel PTV (Programmed Temperature Vaporizer with septum head and Liquid CO2 cooling).
I am trying to use an application on page A -19 of the Gerstel application notes from www.gerstelus.com/admin/prod_file.php?file=GC_Injection_Primer.pdf
and I am finding that it uses quite a lot of Liquid CO2 just to cool ONLY the inlet down to -20C; there is no oven cooling. ( One cylinder of size EE Liquid CO2 (15m3) cannot be used for more than 10 injection for this application.)
I would appreciate if anyone could kindly let me know what your Liquid CO2 consumption experience was when using a PTV since this appears to be highly unusual.
It goes through cryogen pretty fast. You would have been better off getting the plumbing for liquid nitrogen, as it's a lot less expensive and a large dewar of liquid N2 will last much longer. I have used both types, and much prefer liquid N2 for the reasons stated.
I think you may have your CO2 tank too far from your injector. You shouldn't go through anywhere near that much coolant. Are you sure you have a CO2 cylinder that a) has liquid and b) has a dip tube? You need to get coolant in liquid form to the injector - this means that the tank needs to be close, the lines need to be relatively small ID lines and you need to have liquid in the tank.
- Badges
- Science method