Inside a FID analyser

Explore a flame ionisation detector, from heated sample line to flame and electrical signal. A self-contained interactive illustration.

FIDexplained
The science of measurement

Flame. Charge. Insight.

Inside a FID analyser.

Follow the sample from molecule to measurement. Explore how a hydrogen
flame turns a gas sample into a tiny electrical signal.

Interactive explainer

Follow the sample

From molecule to measurement

Measuring
Flame ionisation detector Sample gas passes through a heated filter and restrictor, mixes with hydrogen and reaches a burner jet inside a heated detector block. Air supports the flame. Charge carriers formed in the flame produce a current measured by the collector electrode and electrometer. Exhaust leaves at the top. 02 / IONISATION Heated block · 190 °C Exhaust 03 / READOUT Electrometer Ioncurrent Collector electrode Collects charge carriers Hydrogen flame Ionisation in the flame Burnerjet 01 / SAMPLE CONDITIONING Sample inHeated line · 190 °C FilterRestrictor Hydrogen fuelH₂ Mixing point Air supply −200 V bias Polarisation voltage
Explore every detail
  • Sample molecule
  • Charge carrier
  • Hydrogen fuel
  • Air / exhaust

Explore the measurement

400 ppm
200 V

Bias influences how efficiently charge is collected.

Prepare the sample

A heated line carries the sample through a filter and restrictor before it mixes with hydrogen fuel.

Create a charge

Organic compounds produce charge carriers in the hydrogen–air flame. The response depends on the compound.

Measure the response

An electric field collects charge. The electrometer converts the tiny current into an indicated carbon response.

Illustrative simulation. Geometry, flame colours and response factors are schematic; values are not calibrated measurements.Flame ionisation detection

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