EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
20
It is possible to remove the intake from the sample cell following the
(p. C-1)
. This allows
the intake to be replaced or cleaned, or a custom intake to be installed.
6.3.4.2 Pump
In normal mode, the EC155 uses a vacuum pump to pull an air sample through
the sample cell and vortex bypass. See the discussion on flow and pressure in
the previous section for pump requirements. The CPEC200 pump module is
designed for use with the EC155. Connect the CPEC200 pump module or user-
supplied sample pump to the 3/8-in Swagelok fitting at the back end of the
vortex bypass tubing and filter assembly in line with the sample cell port
labeled
Pump
.
6.3.4.3 Zero and Span
The zero-and-span inlet connects to the pump connection passage near the
outlet of the sample cell. During normal operation the zero-and-span inlet
should be plugged, either with a Swagelok 1/4-in plug, or with a tube
connecting to a closed valve or manifold system such as the CPEC200 valve
module. During zero and span, the zero or span gas can be pushed into this
fitting to flow backward through the sample cell and exhausted through the
intake assembly.
The CPEC200 system includes a valve module controlled by a
CR3000 datalogger, which automates the zero gas and CO
2
span
gas flows during the zero-and-span procedure.
6.4 Wiring and Connections
and FIGURE
below show the EC100 electronics panel and
the bottom of the EC100 enclosure, respectively. Refer to these figures during
wiring and connecting.
NOTE
Содержание EC155
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