What is the principle of operation of a Flame Ionization Detector?
A flame-ionization detector (FID) is the most popular detector for the analysis of hydrocarbons due to its high sensitivity, wide linear dynamic range, low dead volume, and responsiveness to trace levels of almost all organic compounds. An FID adds hydrogen to the column effluent and passes the mixture through a jet where it is mixed with entrained air and burned. The ionized gas (charged particles and electrons produced during combustion) passes through a cylindrical electrode. A voltage applied across the jet and cylindrical electrode sets up a current in the ionized particles. An electrometer monitors this current to drive a measure of the component concentration. An ignitor coil and flame out sensor are placed above the jet to re-ignite the flame should it become extinguished. The entire system is placed inside a chimney to avoid drafts and condensation of water droplets resulting from the combustion process. The response of the FID is proportional to the number of CH12 groups that
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- What is the principle of operation of a Flame Ionization Detector?
