Csat3A Of Serial Numbers Less Than 2000, And Pn 32065 Is For - Campbell EC150 Instruction Manual

EC150 CO /H O Open-Path Gas Analyzer
2 2
12
pn 26785
FIGURE 6-1. Three mounting bracket options for the EC150: pn 26785
is for the EC150 head only, pn 26786 is for the EC150 head with
CSAT3A of serial numbers less than 2000, and pn 32065 is for the
EC150 head with CSAT3A serial numbers 2000 and greater.
The mounting brackets for the EC150 with CSAT3A, pn 26786 and pn 32065,
allow the EC150 optical path to have various spatial separation from the
CSAT3A sonic volume. Depending on the position, the spatial separation can
range from 5.0 cm in the EC150's most fore position to 9.7 cm in the most aft
position, as illustrated in FIGURES
allows a small but significant difference in the flux attenuation ratio.
The position of the EC150 relative to the CSAT3A should be determined by
the end user based on the measurement of interest. For applications where
spatial separation is of most importance, such as when the instrument is close
to the ground, moving the EC150 in the most forward direction will yield the
most collocated arrangement. For taller measurement applications and where
flow distortion may be a measurement concern due to larger angles of attack
and where spatial separation requirements become relaxed due to
predominately larger eddies, the EC150 should be mounted in the most aft
position. The effect of spatial separation on flux attenuation is greatest at lower
measurement heights as shown in FIGURE
pn 26786
pn 32065
6-3 and 6-4. This change in positioning
6-2. Contact Campbell Scientific to