1. Instruments used HORIBA AIA721 NDIR online analyzer
integrated in emission bench
Varian GC 450
with ECD
offline analysis
total run time 7 min
WLTP-DTP-AP

2. Background measurement from air bag
GC shows good repeatabiliy with low scatter (Std = 1,6 ppb)
NDIR shows offset of -35 ppb and significantly higher scatter (Std = 29 ppb)
WLTP-DTP-AP

3. Measurement from sample bag
Deviation of NDIR to GC of up to 25 %
Interference correction has large influence on NDIR results
WLTP-DTP-AP

4. Emission results from FTP75 tests
WLTP-DTP-AP

5. Simulated emission results at low level
Sample bags were assumed with 0,5 ppm for all tests
WLTP-DTP-AP