Campbell Scientific IRGASON Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer - Manual (Page 35)

IRGASON ® Integrated CO
2
/H
2
O Open-Path Gas Analyzer and 3D Sonic Anemometer
TABLE 8-2. Multipliers and Offsets for Analog Outputs
Density
(mg m -3 )
Voltage Output Multiplier
(mg m -3 V -1 )
Offset
(mg m -3 )
CO
2
386.32 -102.59
H
2
O 8.65 -2.26
9. Maintenance
IRGASON operation requires six maintenance tasks:
• routine maintenance
• wick maintenance
• analyzer window cleaning
• zero and span
• replacing the analyzer desiccant / scrubber bottles
• factory recalibration
9.1 Routine Maintenance
Periodically do the following:
• Check the humidity indicator card in the EC100 enclosure. If the highest
dot has turned pink, replace or recharge the desiccant bags. Replacement
desiccant may be purchased (pn 6714) or old desiccant packs may be
recharged by heating in an oven. See the manual ENC10/12, ENC12/14,
ENC14/16, ENC16/18, available at www.campbellsci.com , for more details
on recharging desiccant bags.
• Make sure the LED Status Lights on the EC100 panel are green. If not,
verify that all connections are secure and that the instruments are powered.
Also check the individual diagnostic bits for the specific fault. See
TABLE 10-2, Bits in the Sonic Diagnostic Flag and TABLE 10-3, Bits in
the Gas Diagnostic Flag.
9.2 Wick Maintenance
9.2.1 Sonic Wicks
The IRGASON cannot measure wind when water droplets completely obscure
the face of the sonic transducers. If the site experiences frequent rainfall, using
wicks on the sonic transducers may be desirable. The wicks help remove
water. Under some conditions, however, droplets may build up and remain on
the transducer faces. As soon as the water droplets evaporate or are removed,
the IRGASON will again measure wind. Remove the water droplets by
dabbing a cotton swab or tissue on the faces of the transducers. The user must
use discretion to determine if wicks are necessary. If wicks are not used,
gently remove the wicks from the sonic transducers, taking care not to damage
or peal the matching layer (rubber tips) from the brass housing of the
transducers.
Remove the wicks during the winter. The wicks will accumulate snow or
freezing rain, resulting in blockage of the sonic signals. The CSAT3 Sonic
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