How can I manage hydrogen fuel flow in my flame ionization detector with hydrogen carrier gas?
Flame ionization detection (FID) sensitivity depends upon the flows of hydrogen and air fuel gases, makeup gas, and the flame jet inner diameter. The simple answer is to reduce the hydrogen fuel gas flow so that the total hydrogen flow through the detector remains close to the manufacturer’s specified optimum flow — usually between 40 and 50 cm3 /min. This approach works with all pneumatic systems as long as the column flow remains constant throughout the chromatographic run.
