INFICON Explorer Portable Gas Chromatograph - Manual (Page 322)

Assay 2 User Notes
320
0.9
1.0
1.0
1.1
1.1
0 1 2 3 4 5 6 7 8 9 10
Run No.
Toluene 10 ppm
Benzene 2.5 ppm
Ethylbenzene 10
ppm
Figure 32 Peak Area Stability for Repetitive Sampling of 10 ppm Toluene,
2.5 ppm Benzene and 10 ppm Ethylbenzene
0.9
1.0
1.0
1.1
1.1
0 1 2 3 4 5 6 7 8 9 10
Run No.
o-Xylene 10 ppm
m-Xylene 10 ppm
Figure 33 Peak Area Stability for Repetitive Sampling of 10 ppm m-Xylene and
10 ppm o-Xylene
Response Drift
Detector response drift is caused by drift in the effective UV lamp intensity over
time. Although
Explorer maintains a constant visible lamp intensity, it is
possible that the ionizing spectral lines, located outside the visible range, shift in
intensity over time.