EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
17
the sample cell pressure relative to ambient pressure, which had a range of
±7 kPa.
If the original EC155 was operated less than 7 kPa from ambient
pressure, the user was required to attach a separate, user-supplied
pressure sensor. In either version of EC155 sample cell, the
pressure of the sample cell is reported as a differential pressure in
relation to ambient pressure.
For the sample cell with vortex intake, the pressure drop in the sample cell is
approximately 6 to 8 kPa at a nominal 8 LPM pump flow (6 LMP flow to the
sample cell and 2 LPM to the vortex bypass). This pressure drop will increase
if the vortex bypass flow reduces; for example, when the bypass filter clogs. If
the bypass flow is reduced for a significant time, the vortex will allow dust or
other particles to travel to the sample cell, which eventually results in
decreased signal strength. When the signal strength falls below 80%, the
bypass filter should be replaced and the analyzer cleaned. See Section
Vortex Filter Replacement and Vortex Intake Cleaning
(p. 35)
for details.
For the older or original sample cell, the pressure drop in the heated intake
assembly is approximately 2.5 kPa at 7 LPM flow with no filter. The inline
filter adds approximately 1 kPa pressure drop when it is clean. This pressure
drop will increase as the filter clogs. The filter should be replaced before the
differential pressure reaches –7 kPa (unless the user has supplied a pressure
sensor with a wider range). See Section
Inline Intake Filter Replacement
(p. 39)
, for details on replacing the inline filter.
6.3.3 Filtration
Newer EC155 sample cells (serial numbers 2000 and greater) use vortex
technology (U.S. Pat. No. 9,217,692) to separate particulates from the sample
flow (see FIGURE
), which eliminates the need for an inline filter.
FIGURE 6-7. External views (top) and cross-sectional views (bottom)
of the vortex intake.
The new intake works by spinning incoming air into a vortex, forcing
particulates to the outside of the vortex, and out a bypass tube.
NOTE
Содержание EC155
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