Method Of Operation - Siemens FIDAMAT 6 Operating Instructions Manual

2.4

Method of operation

1
2
3
4
Figure 2-2
The measuring principle is based on flame ionization detection (FID) with a detection limit of
approximately 0.1 ppm. During the combustion of hydrocarbons in a hydrogen flame, ions
are formed that are in turn converted into a current flow by the application of an electric field.
The resulting amperage is a measure of the number of carbon atoms.
The FIDAMAT 6 measures specific to the substance class, not component-specific. It
measures the total of all organically bound carbons in a sample gas, however with different
weighting of the hydrocarbon molecules.
In a first approximation, the display is proportional to the number of C atoms in the
respective molecule. However, there are deviations in practice. The display deviation for the
specific molecule is expressed by the response factor.
FIDAMAT 6
Operating Instructions, 03/2018, A5E00222135-03
Flame
Quartz nozzle
Combustion air
Sample gas
Method of operation of flame ionization detector
2.4 Method of operation
5 H2
6 Measuring electrode
7 Amplifier
Description
19