Campbell IRGASON Manuale Scaricare il pdf (Pagina 41)

IRGASON Integrated CO

O Open-Path Gas Analyzer and 3D Sonic Anemometer

Scrubber bottle cover

FIGURE 9-5. Replacing the desiccant and CO2 scrubber bottles

9.6 Factory Recalibration

When the IRGASON is manufactured, the gas analyzer calibrated over a wide

range of temperatures, pressures, and gas concentrations. All CO

calibration

gases used in this process are mixtures of CO

in ambient air and are traceable

to the WMO Mole Fraction Scale maintained by the Central Carbon Dioxide

Laboratory and the Carbon Cycle Greenhouse Gases Group of the Global

Monitoring Division / National Oceanographic and Atmospheric

Administration in Boulder, CO, USA.

After an extended period of time in the field, the IRGASON gas analyzer may

need to undergo this factory calibration again to ensure valid measurements.

When recalibration is deemed necessary, contact Campbell Scientific.

The IRGASON sonic anemometer also undergoes an initial factory calibration.

Usually this calibration remains valid unless a transducer fails or damage to the

instrument leads to a change in geometry. The sonic anemometer requires

calibration when

• it develops a wind offset greater than the specification.

• it sets diagnostic flags under dry conditions with little to no wind and

with no obstruction in the ultra sonic paths.

The wind offset is tested by creating a zero wind environment by encircling the

sensor with a large plastic bag (unused refuse bag), using caution not to block

the sonic paths. See the manual CSAT3 Three Dimensional Sonic Anemometer,

Section 11.2.2, Test for Wind Offset, available at www.campbellsci.com

When recalibration is deemed necessary, contact Campbell Scientific.

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Campbell IRGASON Manuale Pagina 41