Campbell IRGASON Manual descarregar pdf (Página 34)

IRGASON Integrated CO

O Open-Path Gas Analyzer and 3D Sonic Anemometer

Remove the wicks during the winter. The wicks will accumulate snow or

freezing rain, resulting in blockage of the sonic signals.

When installing wicks, be sure they are located in the proper position. The top

wick must be flush with the transducer face, with the wick tail located at the

lowest point of the transducer (see Figure 9-1). The end of the bottom

transducer wick must extend above the transducer face by one-half to one mesh

line (see Figure 9-1). Secure the wicks to the transducer with a drop of

adhesive (e.g., super glue). Take care that super glue is not deposited on the

transducer face.

Replacement top wicks (p/n 17388) and bottom wicks (p/n 17389) can be

purchased from Campbell Scientific. A complete set of wicks consists of three

top wicks and three bottom wicks.

FIGURE 9-1. Proper location of the sonic top wick (left)

and bottom wick (right)

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

and CO

. Following installation, these values should be unchanged.

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Campbell IRGASON Manual Página 34