EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
19
Older EC155 sample cells (serial numbers less than 2000) are typically
operated with an inline filter element, although the analyzer will not be
damaged by use without a filter. In either configuration, particulates will
collect on the optical windows over time, reducing the signal levels until the
windows must be cleaned (see Section
(p. 40)
).
Using a filter on the inlet will increase the time before the windows must be
cleaned. A finer pore size will keep the windows clean longer, but will need to
be replaced more frequently. The previous-version intake assembly includes a
20 micron filter element, which gives a compromise between filter replacement
and window cleaning.
6.3.4 Plumbing Connections
There are two connections to the EC155 sample cell: the
Zero/Span
inlet and
Pump
outlet, as illustrated in FIGURE
. In the normal mode, a vacuum
pump pulls an air sample from the sample intake through the sample cell, and
in the case of the vortex intake, it also pulls bypass flow from the vortex. In
Zero-and-Span
mode the pump is turned off and a zero-and-span gas is pushed
backwards through the sample cell, exhausted out through the sample inlet.
FIGURE 6-10. End view of EC155 analyzer showing ports for pump
outlet (vortex bypass tubing and filter assembly not shown) and
zero-and-span intake
6.3.4.1 Sample Intake
All new EC155 analyzers include a sample cell with vortex intake. Assembly
of the vortex is described in Section
(p. 11)
.
Users with older analyzers may upgrade to the vortex intake by replacing their
sample cell. Contact Campbell Scientific for more details.
Analyzer Head Cable
Analyzer Head Cable
Содержание EC155
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