Does Torrent analyze for fixed gases?

Yes. Torrent has an independent instrument capable of analyzing for Methane, Ethane, Ethene, Carbon Monoxide, Carbon Dioxide, Nitrogen, Oxygen, Hydrogen and Helium.

Do I have to take separate samples if I need both TO-15/TO-14A/TO-3 and the Fixed Gases?
No. As long as the canisters are full, all analyses can be performed from the same sample. If the sample volume is low, it will affect final reporting limits. However, if multiple techniques are requested, Torrent will perform the most sensitive technique first. Because fixed gases are reported in % and/or ppmV ranges, slight dilution factors due to low pressure does not affect the final reporting limits as dramatically as the TO methods.