Specifications, 1 measurements, Measurements – Campbell Scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer User Manual
Page 13
EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
5. Specifications
5.1 Measurements
Features
•
To compute carbon dioxide, water vapor, and sensible heat fluxes using
the eddy-covariance method, the EC155 measures:
o absolute carbon dioxide
o water vapor mixing ratios
o three-dimensional wind speed (requires CSAT3A)
o sonic air temperature (requires CSAT3A)
o sample-cell temperature
o barometric pressure
These measurements are required to compute carbon dioxide and water vapor
fluxes using the:
•
Standard outputs:
o CO
2
mixing ratio, H
2
O mixing ratio
o gas analyzer diagnostic flags
o cell temperature, cell pressure
o CO
2
signal strength, H
2
O signal strength
o differential pressure
o air temperature and air pressure are auxiliary sensor inputs
•
Additional 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
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
)
3