Flow Measurement

Those doing gas chromatography must routinely measure gas flows when setting up an instrument, developing a method, or troubleshooting. With today′s modern GCs, chromatographers may rely on electronic pressure control (EPC) for setting flow rates. However, a flowmeter is still an essential tool to have when troubleshooting is necessary. Also, many older GCs still in use do not have EPC, requiring that flows be set manually using a flowmeter. Gas flowmeters generally fall into two types, volumetric and mass, each with its advantages and limitations. Both types measure the amount of gas exiting a column or split vent in a specific time period.