Flame ionization detector

Claim 1

A thermionic flame ionization detection arrangement for the detection of phosphoro-organic compounds, comprising: a detector having a body member containing a flame jet electrode, introduced inner and outer electrodes mounted in the body member coaxially one within the other, said jet electrode being coaxial with the inner electrode, said outer electrode extending beyond the end of the inner electrode in the direction of the flame jet electrode, a removable electrode tip carrying a flame seeding material mounted on said outer electrode adjacent the jet electrode, a source of polarizing potential connected between said inner and outer electrodes, a first circuit path including said source of polarizing potential whereby a first ionic current representative of a wanted component can be derived from between said inner and outer electrodes, a second circuit path in parallel with said first circuit path and including said source of polarizing potential whereby a second ionic current representative of unwanted components can be derived between said outer electrode and said jet electrode and means connected in said first circuit path for detecting said first ionic current representative of a wanted component.