How does a FID instrument work?
The flame ionization detector is based on the measuring of the conductivity of a flame between two electrodes, whereas hydrogen is used as burnable gas.
The substances that are to be analyzed are transported into
the flame by the flow of outgoing air. Here they ionized
thermally. In this process electrons are released which get
caught by a surrounding metallic wire mesh. The resulting
change in the conductivity of the outgoing air as measured
serves as measurement value for the calculation of the
pollution burden.
A continuous monitoring of the values enables us to analyze
changes in the outgoing air during operation.
