EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
39
8.
Reassemble the vortex intake. The gas analyzer windows and sample cell
are now ready to be cleaned as detailed in Section
9.2.2 Inline Intake Filter Replacement
This section only applies for users with EC155 models with serial numbers less
than 2000.
The differential pressure between the sample cell and ambient pressure should
be monitored over time in the output data. (This can also be done using the
display screen of
ECMon
).
If the differential pressure approaches the limit of the full scale range (–7 kPa),
it is likely that the intake filter is clogged and should be replaced. To replace
the filter, follow these steps:
1.
Stop the air flow through the EC155.
2.
Locate one of the EC155 intake filters in the mesh pocket of the EC100
enclosure.
3.
The Santoprene filter assembly is held in place by friction, remove it by
simply pulling on the rain diverter. Once removed, make sure the
underlying aluminum disk and intake hole are free from debris.
4.
Remove the old filter by pulling back on the Santoprene rim that surrounds
the filter and pulling up on the filter’s edge. Once removed, insert a new
filter by pushing the filter in place while pulling back the Santoprene rim.
Continue doing this until the filter is well seated.
5.
Place the Santoprene filter assembly on the intake’s aluminum disk. Press
along the Santoprene edge to make sure it is well-seated, see FIGURE
The standard intake filter has a sintered disk with 20 micron pore
size. For dusty sites, an intake filter with 40 micron pores may be
ordered, which will increase the lifetime of the filter. Ideally, the
appropriate pore size will result in the filter needing replacement
at the same time the windows need cleaning (see Section
(p. 40)
). For extremely dusty
conditions, lowering the flow rate through the analyzer will further
increase the lifetime of the filter, although this will also result in a
decrease in frequency response.
NOTE
Содержание EC155
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