FID – Flame Ionization Detector


  • Hydrocarbon selective
  • Robust, linear, stable
  • Detects down to 1ppm
  • Unique ceramic ignitor can run hot continuously to keep flame lit
FID – Flame Ionization Detector
Basic Model

The FID responds to any molecule with a carbon-hydrogen bond, but not at all, or poorly, to compounds such as H2S, CCl4, or NH3. The FID response is very stable from day to day and is not susceptible to contamination from dirty samples or column bleeding.

The SRI FID employs a unique ceramic ignitor that can run hot continuously, immediately re-igniting the flame even when presented with large water injections or pressure surges from column backflush.

The FID is thermostatted in an aluminum block up to 375°C and is equipped with an electrometer amplifier with HIGH, HI-FILTERED (for extra noise immunity), and MEDIUM gain settings. Hydrogen and airflow are controlled using Electronic Pressure Controllers (EPC) for high precision. The optional built-in whisper-quiet air compressor can be used to supply the air for the FID, eliminating the bulky air cylinder.

If CO and CO2 are target analytes, order our Methanizer accessory (page 71) for the FID detector. The Methanizer allows the FID to detect low levels of CO and CO2 by converting them to methane without changing their retention times. Thermostatted to 380°C, the Methanizer is a special catalyst jet that can be removed for normal FID operation.

8690-0020 FID detector

8690-0081 Methanizer accessory for low level CO & CO2

8690-0070 Optional 120 VAC 60 Hz built-in whisper-quiet air compressor

8690-2270 Optional 220 VAC 50 Hz built-in whisper-quiet air compressor