Campbell IRGASON, Руководство по эксплуатации продукта

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FIGURE 9-2. Spare Sonic Wicks Kit contents
9.2.2 Gas analyzer wicks
IRGASON gas analyzer windows are polished and slanted at an angle to prevent water from
collecting on their surfaces. However, due to increased surface tension at the interface with the
snout, water can pool at the edges and partially block the optical path and attenuate the signal.
To minimize the occurrence of such events and the resulting data loss, consider using wicks. The
weave of the wick fabric promotes capillary action that wicks the water away from the edge of the
windows. The seam and the straight edge of the wicks are permeated with a rubberized
compound to prevent them from shifting during operation.
Proper installation of the wicks is critical. They should not block or encroach on the optical path.
Before installation, record signal strengths for both H
2
O and CO
2
. Following installation, these
values should be unchanged.
Wicks are available as listed in Table 9-1 (p. 33).
Table 9-1: Rain wick replacement parts
Wick
Campbell Scientific, Inc.
part number
Campbell Scientific description
Bottom wick 28652 IRGASON or EC150 Rain Wick Bottom
Top wick 28653 IRGASON or EC150 Rain Wick Top
The top wick has a short seam which has to be aligned with the short side of the top snout. The
angled edge of the wick must closely follow the edge of the window without encroaching on the
optical path (see
FIGURE 9-3 (p. 34)). The bottom wick is installed in a similar manner, except the
long seam should be aligned with the long side of the bottom snout. Once in place, the wicks
should fit snuggly over the cylindrical part of the snout without any creases or wrinkles.
IRGASON® Integrated CO
2
/H
2
O Open-Path Gas Analyzer and 3D Sonic Anemometer 33