Campbell Scientific EC150 CO2 and H2O Open-Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer User Manual
Page 18
EC150 CO
2
/H
2
O Open-Path Gas Analyzer
Gas analyzer
Measurement precision
CO
2
density:
0.2 mg·m
–3
(0.15 µmol·mol
–1
)
H
2
O density:
0.004 g·m
–3
(0.006 mmol·mol
–1
)
Factory calibrated range
CO
2
:
0 to 1000 µmol·mol
–1
H
2
O:
0 to 72 mmol/mol (37°C dewpoint)
Temperature:
−
30° to 50°C
Barometric pressure:
70 to 106 kPa
CO
2
performance
Zero max drift
:
±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
±0.04 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)
CSAT3A sonic measurement precision
u
x
:
1.0 mm·s
–1
u
y
:
1.0 mm·s
–1
u
z
:
0.5 mm·s
–1
Sonic temperature:
0.025°C
CSAT3A sonic accuracy
Offset error
u
x
, u
y
:
< ±8 cm·s
–1
u
z
:
< ±4 cm·s
–1
Gain error
Wind vector ±5° horizontal: < ±2% of reading
Wind vector ±10° horizontal: < ±3% of reading
Wind vector ±20° horizontal: < ±6% of reading
iii
noise rms, assumes:
o 25°C
o 85 kPa
o 14 g·m
-3
H
2
O
o 597 mg·m
-3
CO
2
o 25 Hz bandwidth
iv
−
30° to 50°C
v
noise rms
vi
assumes:
o −30° to +50°C
o wind speed <30 m·s
-1
o azimuth angles between ±170°
8