In the field of total hydrocarbon gas analysis, flame ionisation detectors (FID) are recognised as reliable and robust measuring devices.

During the measurement, a sample gas is continuously drawn in under negative pressure and fed to the FID via a heated sampling line. There, the sample gas is burnt in a hydrogen diffusion flame. If hydrocarbons enter the flame with the sample gas, these organic compounds are decomposed in the combustion process (cracking).

This produces CH fragments, which oxidise with atomic oxygen to form CHO ions. These ions are separated in an electric field (stripping). The resulting current is proportional to the amount of hydrocarbons added.

FIDs are primarily used for the continuous monitoring of exhaust air purification systems in accordance with the Federal Immission Control Act. Mobile versions are also indispensable analytical measuring instruments for technical inspection associations and other accredited measuring bodies. FIDs can also support in-house process analysis and control.

Inline FIDs have proven particularly effective in the field of LEL measurement. In applications requiring fast response times and with high condensate or dust loads, these robust FIDs demonstrate long service lives.