
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
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