Continuous flow - A method of analysis where sample material is
moved through a series of conversion and purification steps
within a continuously flowing stream of carrier gas, typically
helium. In most cases, this method allows for a single
measurement of a sample. Continuous flow interface - The carrier
gas flow rate from a continous flow system is typically an order
of magnitude higher than an isotope ratio mass spectrometer
(IRMS) can handle. A reduction in flow immediately upstream the
IRMS is achieved with a plumbing interface. Dual inlet - A
method of analysis where a sample gas and and reference gas are
alternately put into the isotope ratio mass spectrometer (IRMS).
This method typically allows for many measurements of a single
sample and is generally considered the most precise way to use
an IRMS. Elemental analyzer - An instrument used to combust
solid or liquid material in a controlled excess oxygen reaction
column. A carrier gas (typically helium) is used to move the
combustion products through a