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EC150 CO
2
/H
2
O Open-Path Gas Analyzer
7
The chopper wheel spins at a rate of 60 revolutions per second and the detector
is measured 1024 times per revolution, resulting in a detector sampling rate of
51.2 kHz. The detector is maintained at
−
40 °C using a three-stage
thermoelectric cooler and is coupled to a low noise pre-amp module.
The EC100 electronics module digitizes and process the detector data (along
with ancillary data such as ambient air temperature and barometric pressure) to
give the CO
2
and H
2
O density for each chopper wheel revolution (50 Hz). This
high measurement rate is beneficial when there is a need to synchronize the gas
measurements with additional sensors measured by the datalogger. To prevent
aliasing, measurements are filtered to a bandwidth that is specified by the user.
5. Specifications
5.1 Measurements
To compute carbon dioxide and water vapor fluxes using the eddy-covariance
method, the EC150 and a sonic anemometer measure:
•
Absolute carbon dioxide density (mg
·
m
–3
)
•
Water vapor density (g
·
m
–3
)
•
Three-dimensional wind speed (m·s
–1
; requires the CSAT3A)
•
Sonic air temperature (°C; requires the CSAT3A)
•
Air temperature (°C; requires an auxiliary temperature probe)
•
Barometric pressure (kPa; requires an auxiliary barometer)
These measurements are required to compute carbon dioxide and water vapor
fluxes using the:
•
Standard outputs:
o
CO
2
density, H
2
O density
o
Gas analyzer diagnostic flags
o
Air temperature
o
Air pressure
o
CO
2
signal strength
o
H
2
O signal strength
•
Additional outputs from auxiliary instruments:
o
u
x
, u
y
, and u
z
orthogonal wind components (requires the
CSAT3A)
o
Sonic temperature (requires the CSAT3A, and is based on the
measurement of c, the speed of sound)
o
Sonic diagnostic flags (from the CSAT3A)
Datalogger Compatibility:
CR6
CR1000X
CR1000
CR3000
CR5000
Measurement
Rate:
60 Hz
Output bandwidth
:
5, 10, 12.5, 20, or 25 Hz
Output rate
10, 25 or 50 Hz
2
user selectable
Summary of Contents for EC150
Page 2: ......
Page 3: ......
Page 7: ......
Page 67: ...Appendix B Filter Bandwidth and Time Delay B 4 ...
Page 75: ...Appendix D Useful Equations D 4 ...
Page 76: ...E 1 Appendix E Safety Data Sheets SDS E 1 Molecular Sieve Type 13X ...
Page 77: ...Appendix E Safety Data Sheets SDS E 2 ...
Page 78: ...Appendix E Safety Data Sheets SDS E 3 ...
Page 79: ...Appendix E Safety Data Sheets SDS E 4 ...
Page 80: ...Appendix E Safety Data Sheets SDS E 5 E 1 Magnesium Perchlorate ...
Page 81: ...Appendix E Safety Data Sheets SDS E 6 ...
Page 82: ...Appendix E Safety Data Sheets SDS E 7 ...
Page 83: ...Appendix E Safety Data Sheets SDS E 8 ...
Page 84: ...Appendix E Safety Data Sheets SDS E 9 ...
Page 85: ...Appendix E Safety Data Sheets SDS E 10 ...
Page 86: ...Appendix E Safety Data Sheets SDS E 11 ...
Page 87: ...Appendix E Safety Data Sheets SDS E 12 E 2 Decarbite ...
Page 88: ...Appendix E Safety Data Sheets SDS E 13 ...
Page 89: ...Appendix E Safety Data Sheets SDS E 14 ...
Page 90: ...Appendix E Safety Data Sheets SDS E 15 ...
Page 91: ...Appendix E Safety Data Sheets SDS E 16 ...
Page 92: ...F 1 Appendix F Packing Information F 1 EC150 GH Packing Information ...
Page 93: ...Appendix F Packing Information F 2 F 2 EC150 SH Packing Information ...
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