Universal Interface for Continuous Flow Isotope Ratio MS The Thermo Scientific ConFlo IV is the first universal Continuous Flow interface, which allows simultaneous attachment of multiple sample preparation devices with different carrier gas flow regimes to the same Isotope Ratio MS. Powerful new features of the ConFlo IV Universal Interface include intelligent connection to all necessary reference gases, automatic sample size recognition, sample and reference signal matching and self-diagnosis. The ConFlo IV takes significant steps towards full automation of the stable isotope laboratory maximizing system utilization and uptime.