Carbon analysis with the TC module
multi EA 5000
86
11
Carbon analysis with the TC module
11.1 Function and design
11.1.1 Function and measuring principle
Expansion of the basic module with the detection module allows determination of the
carbon content in solid, liquid, paste-like, viscous and gaseous samples.
The detection module contains a wide-range NDIR detector. The carbon content in or-
ganic compounds can be determined as TC and EC/OC sum parameters with the detec-
tion module.
Carbon dioxide (CO
2
) and water (H
2
O) is created during thermal oxidation of the sam-
ples in the basic module. The gas mixture is dried and transferred to the NDIR detector.
R + O
2
→ CO
2
+ H
2
O
R: Hydrocarbon
The radiation sensor is CO
2
-sensitive. The double bond between carbon (C) and oxy-
gen(O) has a specific absorption range in the infrared wavelength band.
If a ray of light is projected through a cuvette arrangement, the CO
2
content in the mea-
suring gas absorbs a proportion of the total radiation proportional to the CO
2
concentra-
tion.
11.1.2 Design
The detection module is used to determine the carbon content in solids, liquids and
gases by measuring the IR IR absorption. All components required for determination are
mounted inside the sealed housing.
The device door is closed tightly and cannot be opened. An LED is installed on the front
of the detection module. The LED flashes during the run-in period and lights up perma-
nently when the module is operational.
Figure 54Basic module with detection module and sampling module
