EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
18
Sample air enters the larger-diameter side of the vortex chamber where the
particles, which are denser than air, are spun to the outside of the vortex and
gradually spiral towards the dirty air exit. Meanwhile, clean air is extracted
from the vortex’s center and sent to the gas analyzer’s sample cell. See
for an illustration of the vortex chamber’s air flow. In FIGURE
, warmer colors represent higher speeds of dirty air to the right (towards
bypass), and cooler colors represent higher speeds of clean air to the left
(towards sample cell).
This new intake dramatically increases the time between maintenance visits
compared to intakes with traditional inline filters. Unlike traditional inline
filters which degrade the frequency response, particularly of H
2
O, as they
become dirty, the vortex intake retains near-constant frequency response. A
coarse screen (FIGURE
) is used across the heated inlet to keep out large
debris and insects. If the screen is found to collect excessive amounts of water
droplets during rain or fog events or frost during very cold conditions, the
screen may be easily removed using a metal pick.
FIGURE 6-8. Cross-sectional view of vortex chamber and respective
air flow
FIGURE 6-9. Screen located at underside of vortex intake
Clean sample air
Dirty bypass air
Air from inlet
Содержание EC155
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