Flame Ionization Detector

Combustion Mechanism

Molecules entering the flame are broken down into ions that migrate toward a collector electrode. This flow of ions creates a small electrical signal that is proportional to the number of carbon atoms present. Because the flame ionization detector responds to almost all organic compounds, it is a universal tool for identifying resin contaminants.

Sensitivity Level

Detecting trace amounts of residual solvents requires a system that can distinguish very small signals from the background noise. This detector can measure parts per million levels of monomers, which is essential for ensuring the safety of medical-grade plastics. The high sensitivity allows for the use of smaller samples, reducing the time needed for preparation.

Operational Constraint

Gases like oxygen, nitrogen and water do not produce a signal because they do not form ions in the flame. While this simplifies the analysis of many polymers, it means the flame ionization detector cannot be used to measure moisture content or inorganic fillers. Consistent gas flow and purity are necessary to maintain a stable flame during the testing cycle.