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High precision TGA experiments require constant purge gas flow rates. Control of the flow rate is especially important with high conductivity gases such as helium. Mass flow controllers with integrated gas switching capability provide this control as part of an individual programmed method. Purge gas flow rates are settable from 0 to 240 mL / min in increments of 1 mL / min. The system is pre-calibrated for helium, nitrogen, air and oxygen, and calibration factors may be entered for other non-corrosive gases.