Campbell Scientific IRGASON Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer User Manual
Page 13
IRGASON
®
Integrated CO
2
/H
2
O Open-Path Gas Analyzer and 3D Sonic Anemometer
These measurements are required to compute carbon dioxide and water vapor
fluxes using the:
•
Standard outputs:
o u
x
, u
y
, and u
z
orthogonal wind components
o sonic temperature (based on the measurement of c, the speed of
sound)
o sonic diagnostic flags
o CO
2
density, H
2
O density
o gas analyzer diagnostic flags
o air temperature, air pressure
o CO
2
signal strength, H
2
O signal strength
o Air temperature and air pressure are auxiliary sensor inputs
Datalogger compatibility:
CR1000
CR3000
CR5000
Measurement
Rate:
100 Hz
Output bandwidth
2
:
5, 10, 12.5, 20, or 25 Hz
Output rate
2
:
10, 25 or 50 Hz
Operating temperature:
–30
o
to 50
o
C
Gas analyzer
Measurement precision
1
CO
2
density:
0.2 mg·m
–3
(0.15 µmol·mol
–1
)
H
2
O density:
0.00350 g·m
–3
(0.006 mmol·mol
–1
)
Factory calibrated range
CO
2
:
0 to 1000 µmol·mol
–1
H
2
O:
0 mmol·mol
–1
to 37
o
C dewpoint
Analyzer temp:
–30
o
to 50
o
C
Baro pressure:
70 to 106 kPa
CO
2
performance
Zero max drift
3
:
±0.55 mg·m
–3
·°C
–1
(±0.3 μmol·mol·°C
–1
)
Gain Drift:
±0.1% of reading·°C
–1
(maximum)
Sensitivity to H
2
O:
±1.1 x 10
–4
µmol CO
2
·mol
–1
H
2
O (max)
H
2
O performance
Zero max drift
3
:
±0.037 g·m
–3
·°C
–1
(±0.05 mmol·mol
–1
·°C
–1
)
Gain Drift:
±0.3% of reading·°C
–1
(maximum)
Sensitivity to CO
2
:
±0.1 mol H
2
O·mol
–1
CO
2
(maximum)
Sonic measurement precision
4
u
x
:
1 mm·s
–1
u
y
:
1 mm·s
–1
u
z
:
0.5 mm·s
–1
Sonic temperature:
0.025
o
C
3