L 290/334
EN
Official Journal of the European Union
10.11.2022
Figure A5/9 Full flow exhaust dilution system schematic
4.1.5.2.
Examples of system components are as listed below.
4.1.5.2.1.
Two sampling probes for continuous sampling of the dilution air and of the diluted exhaust gas/air mixture.
4.1.5.2.2.
A filter to extract solid particles from the flows of gas collected for analysis.
4.1.5.2.3.
Pumps and flow controller to ensure constant uniform flow of diluted exhaust gas and dilution air samples taken during the course of the test from sampling probes and flow of the gas samples shall be such that, at the end of each test, the quantity of the samples is sufficient for analysis.
4.1.5.2.4.
Quick-acting valves to divert a constant flow of gas samples into the sample bags or to the outside vent.
4.1.5.2.5.
Gas-tight, quick-lock coupling elements between the quick-acting valves and the sample bags.
The coupling shall close automatically on the sampling bag side.
As an alternative, other methods of trans­ porting the samples to the analyser may be used (three-way stopcocks, for instance).
4.1.5.2.6.
Bags for collecting samples of the diluted exhaust gas and of the dilution air during the test.
4.1.5.2.7.
A sampling critical flow venturi to take proportional samples of the diluted exhaust gas (CFV-CVS only).
4.1.5.3.
Additional components required for hydrocarbon sampling using a heated flame ionization detector (HFID) as shown in Figure A5/10.
4.1.5.3.1.
Heated sample probe in the dilution tunnel located in the same vertical plane as the particulate and, if applicable, particle sample probes.
4.1.5.3.2.
Heated filter located after the sampling point and before the HFID.