LI-COR LI7200RS, Instruction Manual

Page: 56 / 226

Section 3. Operation
Variable Description
CO2 dry (µmol/mol)
1
See note below
H2O (mmol/m
3
) H
2
O concentration density
H2O (g/m
3
) H
2
O mass density
H2O Absorptance H
2
O raw absorptance value
H2O (mmol/mol) H
2
O mole fraction
H2O dry (mmol/mol)
2
See note below
Dew Point (°C) Dew point temperature (°C)
Cell Temperature (°C) Weighted average temperature of T
in
and T
out
Temperature In (°C) Temperature at sensor head inlet
Temperature Out (°C) Temperature at sensor head outlet
Block Temperature (°C) Temperature at IRGA block
Total Pressure (kPa) LI-7550 box pr head pressure
Box Pressure (kPa) Pressure measured at LI-7550
Head Pressure (kPa) Differential pressure measured at head (head – box)
Cooler Voltage (v) Detector cooler voltage
Chopper Cooler Voltage (V) Chopper cooler voltage
SmartFlux Vin (v)
Voltage in, SmartFlux System required
Diagnostic Value Diagnostic value 0-8191
Diagnostic Value 2 Diagnostic value 0 or 1 (sync clocks)
2
CO2 Signal Strength CO
2
Signal Strength (S
c
)
H2O Signal Strength H
2
O Signal Strength (S
w
)
Average Signal Strength (S
c
+ S
w
)/2
Delta Signal Strength S
c
- S
w
7550 Auxiliary Input 1 Auxiliary input 1 value
7550 Auxiliary Input 2 Auxiliary input 2 value
7550 Auxiliary Input 3 Auxiliary input 3 value
Table 3-1 . Variables available for display and logging to the USB drive.
(...continued)
1
CO
2
dry and H
2
O dry are the dry mole fractions of CO
2
and H
2
O in the air sample, calculated using
high-speed measurements. They account for changes in air sample density due to water vapor contnet,
pressure, and temperature of the sample air. CO
2
dry and H
2
O dry are computed as mole of gas per
mole of dry air, and can be used for computing eddy covariance fluxes without the need for density
corrections (Webb et al., 1980).
2
A value of 0 indicates that the clocks in the LI-7550 and LI-7700 (if connected) are not synchronized, and
the LI-7550 may not be logging data to USB drive. A flag will appear next to ‘LI-7700’ in the dashboard in
this state. A value of 1 indicates clocks are synchronized, and data are being logged to USB drive.
3-14 LI-7200RS Enclosed CO₂/H₂O Analyzer