horiba Checker CC-100E, Operating Instructions Manual, Page: 8 / 23

HORIBA Device overview
NOx Converter Checker CC-100E 9/ 24
3 Unit overview
3.1 Scope of delivery
Designation Quantity
NOx Converter Checker CC-100E 1 piece
Operating instructions 1 piece
Mains connection cable 230V 1 piece
3.2 Labelling
Fig. 1:
Example of a type plate
The nameplate of the CC-100E is located on the back above the O2 inlet.
3.3 Description
The HORIBA Converter Checker CC-100E is a compact device for checking the reliability of gas analysers
for determining the NOx content in exhaust gases. For this purpose, the device generates ozone from an
oxygen-saturated atmosphere in a high-voltage unit, mixes the ozone with externally supplied NO and
produces a gas mixture with a precise NO2 concentration. The CC-100E is optimised for high stability and
short reaction times.
The operating principle of the NOx Converter-Checker CC-100E is based on gas phase titration (GPT). Gas
phase titration generally refers to any titration carried out in the gas phase. More specifically, it is a method
for determining reactive fractions in the gas phase by reacting with the excess of another gas that serves
as the titrant. In our case, the gaseous analyte is ozone, which can be "titrated" with nitric oxide according
to the following reaction
O3 + NO → O2 + NO2.
The unknown NO concentration can then be determined from measuring the concentration of the reaction
products.
Compared to simple spectrophotometry, gas phase titration has two advantages:
The measurement is not dependent on the path length of the gas path, as the same gas path is used for
both the measurement of the excess titrant and the measurement of the product.
The measurement also does not depend on the linear change in absorbance as a function of the
concentration of the gas to be analysed (Beer-Lambert law). Therefore, the method is particularly suitable
for such samples whose components interfere at similar wavelengths as the analysis gas.