Summary of symbols

The software uses a grouping scheme for categorizing variables. Variables displayed in a Measurements grid or logged in a data file will be labeled with a group name and a display label. Some groups (e.g., Meas) are available all the time, and some (e.g., Aquatic) are available only in certain configurations, determined by the attached chamber, and the settings on the Start Up > Chamber Setup and/or Peripheral Setup pages.

While any of these variables can be displayed on the Measurements grid, most are not there by default. However, a simple way to see what groups are available and to check current values is Start Up > Data Dictionary.

What follows are tables for each of the approximately 40 defined groups. Each entry shows the Display Label (the name that appears on the interface, or in the log file), its units, a description, and the internal name. The latter is used to reference the variable from a background program (BP), for example.

Aquatic

Table 4‑4 . Aquatic chamber configuration and settings.
Display Label Units Description Internal Name
Fan On Chamber circulation fan FanOn
Pump On Aquatic sample air flow PumpOn
Pump Speed V Operating range 2 to 5 V PumpV
Bubble effect Bubble effect on tau_w bubble
Blue adjust Quantum sensor cal adjust, blue qc_b
Red adjust Quantum sensor cal adjust, red qc_r
tau_wb Chamber clear water transmittance, blue tw_b
tau_wr Chamber clear water transmittance, red tw_r

AquaticQ

Table 4‑5. Aquatic chamber light related measurements and computations.
Display Label Units Description Internal Name
Qabs µmol m-2 s-1 Flux absorbed by algae Qabs
Qabs* µmol s-1 Absorbed quantum flow (Qabs X window area) Qabs*
Qavg µmol m-2 s-1 Average in-sample irradiance Qavg
Qin µmol m-2 s-1 Flux incident on aquatic sample Qin
Qout µmol m-2 s-1 Flux leaving aquatic sample Qout
tau_s Measured sample transmittance tau_s
tau_w Transmittance of water (adjusted for color) tau_w

Auxiliary

Table 4‑6. Settings and measurements associated with the Console USER I/O Port.
Display Label Units Description Internal Name
ADC_CH1 V Spare channel 1 ADC_CH1
ADC_CH2 V Spare channel 2 ADC_CH2
ADC_CH3 V Spare channel 3 ADC_CH3
ADC_CH4 V Spare channel 4 ADC_CH4
ADC_CH5 V Spare channel 5 ADC_CH5
ADC_CH6 V Spare channel 6 ADC_CH6
ADC_CH7 V Spare channel 7 ADC_CH7
ADC_CH8 V Spare channel 8 ADC_CH8
AuxPower V Auxiliary power setting (leaf chamber) AuxPower
GPIO GPIO Status channels 8 through 1 GPIO
GPIO_dir GPIO Direction channels 8 through 1 GPIO_dir
ch1_pullup Pullup resistor for ADC_CH1 adc_ch1_pullup
DAC_1 V D/A setting (-5 to +5V) dac1
DAC_2 V D/A setting (-5 to +5V) dac2
DAC_3 V D/A setting (-5 to +5V) dac3
DAC_4 V D/A setting (-5 to +5V) dac4
excit_5v 5 V excitation line excitation_5v
power_12v 12 V power power_12v
power_5v 5 V power power_5v

ChambConst

Table 4‑7. Constants associated with the currently selected chamber.
Display Label Units Description Internal Name
Aperture cm2 Attached chamber aperture Aperture
Chamber Attached chamber ID Chamber
blc_Po kPa Reference pressure for blc calculation blc_Po
blc_a Boundary layer coefficient ’a’ blc_a
blc_b Boundary layer coefficient ’b’ blc_b
blc_c Boundary layer coefficient ’c’ blc_c
blc_d Boundary layer coefficient ’d’ blc_d
blc_e Boundary layer coefficient ’e’ blc_e
blc_maxS cm2 Maximum area for blc calculation blc_maxS
blc_minS cm2 Minimum area for blc calculation blc_minS

ConsoleLS

Table 4‑8. Settings associated with the light source connected to the console (if any).
Display Label Units Description Internal Name
Pc Photodiode count Pc
Q µmol m-2 s-1 Light Source output Q
Tled C LED tile temperature TLEDTile
f_red Fraction red f_1
f_green Fraction green f_2
f_blue Fraction blue f_3
f_white Fraction white f_4

ConStatus

Table 4‑9. Console status values.
Display Label Units Description Internal Name
CO2_f V CO2 Injector flow CO2_FLOW
CO2_f_s V CO2 Injector status CO2_FLOW_STATUS
Pump_f V Pump flow PUMP_FLOW
Pump_f_s V Pump status PUMP_FLOW_STATUS
Pump_p V Pump pressure flow PUMP_PRESSURE
Pump_p_s V Pump pressure status PUMP_PRESSURE_STATUS
V_system V System voltage SYSTEM_VOLTAGE
Tboard C Console board temperature TEMPERATURE

Const

These constants are associated with the Gas Exchange computations, and depend on how the Start Up > Chamber Setup page is configured.

Table 4‑10. Constants for typical gas exchange measurements.
Display Label Units Description Internal Name
Custom mol m-2 s-1 1-sided BLC CustomBLC
Geometry Used for boundary layer conductance (BLC) Geometry
K Stomatal ratio K
S cm2 Leaf area S
Table 4‑11. Constants for the aquatic chamber.
Display Label Units Description Internal Name
Dcell cells ml-1 Algal cell density Dcell
Dchl µg ml-1 Chlorophyll density Dchl
Dmass mg ml-1 Algal mass density Dmass
Volume ml Sample volume V

Dynamic

Table 4‑12. Computations associated with dynamic assimilation and transpiration.
Display Label Units Description Internal Name
Adyn µmol m-2 s-1 Assimilation via dynamic method Adyn
Crd µmol mol-1 CO2 ref, dry equivalent, time lag adjusted Crd
Csd µmol mol-1 CO2 sample, dry equivalent, from regression Csd
Edyn mmol m-2 s-1 Transpiration via dynamic method Edyn
Hr mmol mol-1 H2O ref, time lag adjusted Hr
Hs mmol mol-1 H2O sample, from regression Hs
αVc cm3 Effective CO2 Volume Volume
αVh cm3 Effective H2O Volume VolumeH
dCsd/dt µmol mol-1 s-1 Rate of change of Csd dCsd/dt
dHs/dt mmol mol-1 s-1 Rate of change of Hs dHs/dt

DynConfig

Table 4‑13. The dynamic configuration settings.
Display Label Units Description Internal Name
Min CO2 Slope µmol mol-1 s-1 Minimum usable slope for CO2 co2_slope_threshold
Min H2O Slope mmol mol-1 s-1 Minimum usable slope for H2O h2o_slope_threshold

FastKntcs

Table 4‑14. Computations from the latest induction flash.
Display Label Units Description Internal Name
Duration ms Flash duration DURATION
ID ID of this INDUCTION flash EVENT_ID
F1 First inflection F1
F2 Second inflection F2
Fmax Max F during flash FMAX
Fo F before flash Fo
T@F1 s Time of F1 T@F1
T@F2 s Time of F2 T@F2
T@Fmax s Time of Fmax T@FMAX
T@HIR s Time of half the initial rise T@HIR

FLR

Table 4‑15. Fluorometer computations, updated after every flash and/or dark event.
Display Label Units Description Internal Name
1-qL 1-qL 1-qL
Flux*_fs µmol s-1 Flux at Fs A
Flux*_d µmol s-1 Dark assimilation rate before Fm Adark
DarkAdaptedID ID of latest dark-adapted flash DarkAdaptedID
DarkPulseID ID of latest dark pulse DarkPulseID
ETR µmol s-1 Electron transport rate ETR
Fm Maximal F, dark adapted Fm
Fmin Measured minimal F, light adapted Fmin
Fm’ Maximal F, light adapted Fmp
Fo Minimal F, dark adapted Fo
Fo’ Minimal F, light adapted Fop
Fs Steady state F Fs
Fv/Fm 1-Fo/Fm Fv/Fm
Fv’/Fm’ 1-Fo’/Fm’ Fvp/Fmp
LightAdaptedID ID of latest light-adapted flash LightAdaptedID
NPQ (Fm-Fm’)/Fm’ NPQ
PS2/1 Ratio PS2 to PS1 PS2/1
PhiCO2 µmol µmol-1 (A-Ao)/Qabs PhiCO2
PhiPS2 1-Fs/Fm’ PhiPS2
Qabs*_fs µmol s-1 Quanta/s absorbed at Fs Qabs
Qmax QMax for latest light adapted flash Qmax
Qmax_d QMax for latest dark adapted flash Qmax_d
alt. Fo’ Alternative Fo’ = Fo/(Fv/Fm+Fo/Fm’) aFop
qL qP Fo’/Fs qL
qN (Fm-Fm’)/(Fm-Fo’) qN
qN_Fo (Fm-Fm’)/(Fm-Fo) qN_Fo
qP (Fm’-Fs)/(Fm’-Fo’) qP
qP_Fo (Fm’-Fs)/(Fm’-Fo) qP_Fo

FlrLS

Table 4‑16. Status and readings associated with the fluorometer light source.
Display Label Units Description Internal Name
f_blue Fraction blue BLUEFRAC
F_dc DC fluorescence DC
f_farred Fraction farred FARREDFRAC
F Demodulated fluorescence FLUOR
Pc Photodiode count PC
Q µmol m-2 s-1 Fluorometer photon flux density PFD
Q_blue µmol m-2 s-1 Blue actinic contribution to Q Q_blue
Q_farred µmol m-2 s-1 Far red contribution to Q Q_farred
Q_red µmol m-2 s-1 Red actinic contribution to Q Q_red
f_red Fraction red REDFRAC
Q_modavg µmol m-2 s-1 Modulated contribution to Q REDMODAVG
TDigital °C Digital board temperature TDigital
TDrive °C Driver temperature TDrive
Tled °C LED tile temperature TLEDTile
TPwrSpy °C Power supply temperature TPowerSupply
TPreamp °C Preamp board temperature TPreamp
TSPF s Time since previous flash TSPF
state 0=Normal, 1=Rect, 2=MPF, 3=Ind, 4=Dark state

FlrStats

Table 4‑17. Statistics on the fluorometer’s modulated fluorescence signal.
Display Label Units Description Internal Name
F_avg Average F F_avg
F_dc_avg Average F_dc F_dc_avg
dF/dt min-1 Rate of change of F dF/dt
dF_dc/dt min-1 Rate of change of F_dc dF_dc/dt
period s Period for stats period

GasEx

Gas exchange computations. These depend on how the Start Up > Chamber Setup page is configured.

Table 4‑18. Example for normal gas exchange computations.
Display Label Units Description Internal Name
A µmol m-2 s-1 Assimilation rate A
Ca µmol mol-1 Ambient (to leaf) CO2 Ca
Ci µmol mol-1 Intercellular CO2 Ci
E mol m-2 s-1 Transpiration rate E
EBSum W m-2 Sum of energy balance components EBSum
Emm mmol m-2 s-1 Transpiration rate Emm
LatHFlux W m-2 Latent Heat Flux LatHFlux
NetTherm W m-2 Net Thermal NetTherm
Pca Pa Ambient (to leaf) CO2 Pca
Pci Pa Intercellular CO2 Pci
RHcham % Relative humidity in the chamber RHcham
Rabs W m-2 Absorbed short wave radiation Rabs
SVPcham kPa Saturation vapor pressure in the chamber SVPcham
SVPleaf kPa Saturation vapor pressure at leaf temp SVPleaf
SenHFlux W m-2 Sensible Heat Flux SenHFlux
TIME s Seconds since Jan 1970 TIME
TleafCnd °C Leaf temperature used for gas exchange computations TleafCnd
TleafEB °C Leaf temperature from energy balance TleafEB
VPDleaf kPa Vapor pressure deficit at leaf temp VPDleaf
VPcham kPa Vapor pressure in the chamber VPcham
gbw mol m-2 s-1 Boundary layer conductance to water vapor gbw
gsw mol m-2 s-1 Stomatal conductance to water vapor gsw
gtc mol m-2 s-1 Total conductance to CO2 gtc
gtw mol m-2 s-1 Total conductance to water vapor gtw
Table 4‑19. Example for the Aquatic Chamber.
Display Label Units Description Internal Name
Flux* µmol s-1 Carbon flow A
Flux_cell µmol cell-1 s-1 Algal cell flux Acell
Flux_chl µmol µg-1 s-1 Chlorophyll based flux Achl
Flux_mass µmol mg-1 s-1 Algal mass flux Amass
TIME s Seconds since Jan 1970 TIME
Taq °C Aquatic chamber temp Taq
pH Aquatic chamber pH pH
pH Signal V Aquatic chamber pH probe signal pH_V

HeadLS

Table 4‑20. Settings associated with the light source connected to the head (if any).
Display Label Units Description Internal Name
Pc Photodiode count Pc
Q µmol m-2 s-1 Light Source output Q
Tled °C LED tile temperature TLEDTile
f_red Fraction red f_1
f_green Fraction green f_2
f_blue Fraction blue f_3
f_white Fraction white f_4

Leak

Table 4‑21. Computations associated with the leak correction.
Display Label Units Description Internal Name
Fan µmol s-1 Estimated mixing fan flow Fan
Leak µmol s-1 Leakage from chamber Leak
CorrFact Leak correction factor LeakK
CorrFactPct % Leak correction factor as percent LeakPE
LeakPct % Leakage as percent of flow LeakPct

LeakConst

Table 4‑22. Constants associated with the leak correction.
Display Label Units Description Internal Name
Fs_meas µmol s-1 Flow_s_adjust table, vector of measured values Fs_meas
Fs_true µmol s-1 Flow_s adjust table, vector of true values Fs_true
fan_a µmol s-1 Fanflow cal coeff fan_a
fan_b µmol s-1/rpm Fanflow cal coeff fan_b
fan_c 1/(rpm) Fanflow cal coeff fan_c
fan_d K/kPa Fanflow cal coeff fan_d
leak_wt Leak weighting factor leak_wt

LeafQ

Table 4‑23. Light computations associated with a leaf in the chamber.
Display Label Units Description Internal Name
Qabs µmol m-2 s-1 PPFD absorbed by the leaf Qabs
Qin µmol m-2 s-1 PPFD incident on the leaf Qin
alpha Weighted leaf absorption alpha
convert J/µmol Weighted conversion from PPFD to W/m2 convert

LQConst

Table 4‑24. Leaf related constants associated with the LeafQ computations.
Display Label Units Description Internal Name
Ambient Ambient light identifier Ambient
Leaf Leaf type identifier Leaf
abs_ambient Leaf PAR absorptance for ambient abs_ambient
abs_blueFlr Leaf PAR absorptance for blueFlr abs_blueFlr
abs_blueLED Leaf PAR absorptance for blueLED abs_blueLED
abs_greenLED Leaf PAR absorptance for greenLED abs_greenLED
abs_redFlr Leaf PAR absorptance for redFlr abs_redFlr
abs_redLED Leaf PAR absorptance for redLED abs_redLED
abs_whiteLED Leaf PAR absorptance for whiteLED abs_whiteLED
k_ambient J/μmol Converts Qin to Rabs for ambient k_ambient
k_blueFlr J/μmol Converts Qin to Rabs for blueFlr k_blueFlr
k_blueLED J/μmol Converts Qin to Rabs for blueLED k_blueLED
k_greenLED J/μmol Converts Qin to Rabs for greenLED k_greenLED
k_redFlr J/μmol Converts Qin to Rabs for redFlr k_redFlr
k_redLED J/μmol Converts Qin to Rabs for redLED k_redLED
k_whiteLED J/μmol Converts Qin to Rabs for whiteLED k_whiteLED

LTConst

Table 4‑25. Constants associated with determining the temperature used for stomatal conductance.
Display Label Units Description Internal Name
deltaTw °C Wall-air temp difference deltaTw
fT1 Fraction Tleaf fT1
fT2 Fraction Tleaf2 fT2
fT3 Fraction TleafEB fTeb

MchEvent

Table 4‑26.Results associated with the latest point match event.
Display Label Units Description Internal Name
co2_adj µmol mol-1 Pre-match error: CO2_r - CO2_s at last match. Ideally 0. co2_adj
co2_at µmol mol-1 CO2 at last match co2_at
co2_cv % CV of last CO2 match co2_cv
co2_match µmol mol-1 Match correction: CO2_r - CO2_a at last pt. match. co2_match
co2_t s Last CO2 match time co2_t
count Match count number count
h2o_adj mmol mol-1 Pre-match error: H2O_r - H2O_s at last match. Ideally 0. h2o_adj
h2o_at mmol mol-1 H2O at last match h2o_at
h2o_cv % CV of last H2O match h2o_cv
h2o_match mmol mol-1 Match correction: H2O_r - H2O_a at last pt. match. h2o_match
h2o_t s Last H2O match time h2o_t
hhmmss Time of last match hhmmss
time secs Time of last match (Seconds since Jan 1970) time

MchStatus

Table 4‑27. The moment-by-moment values assocated with the current match correction, be they from a previous point match, or the on-going range match adjustments.
Display Label Units Description Internal Name
MatchCO2 µmol mol-1 CO2 Match adjustment value MatchCO2
MatchH2O mmol mol-1 H2O Match adjustment value MatchH2O
MatchValveR % Reference match valve position MatchValveR
MatchValveS % Sample match valve position MatchValveS
cf_co2_a mmol mol-1 CO2 Match coeff a cf_co2_a
cf_co2_b CO2 Match coeff b cf_co2_b
cf_co2_c CO2 Match coeff c cf_co2_c
cf_co2_d CO2 Match coeff d cf_co2_d
cf_h2o_a mmol mol-1 H2O Match coeff a cf_h2o_a
cf_h2o_b H2O Match coeff b cf_h2o_b
cf_h2o_c H2O Match coeff c cf_h2o_c
cf_h2o_d H2O Match coeff d cf_h2o_d
co2_elapsed min Elapsed time since CO2 match co2_elapsed
co2_fit_high µmol mol-1 CO2 range match fit upper limit co2_fit_high
co2_fit_low µmol mol-1 CO2 range match fit lower limit co2_fit_low
h2o_elapsed min Elapsed time since H2O match h2o_elapsed
h2o_fit_high mmol mol-1 H2O range match fit upper limit h2o_fit_high
h2o_fit_low mmol mol-1 H2O range match fit lower limit h2o_fit_low

Meas

Table 4‑28. The essential measurements coming from the head that go into gas exchange computations.
Display Label Units Description Internal Name
CO2_a µmol mol-1 Sample cell CO2 w/o match adjust CO2_a
CO2_r µmol mol-1 Reference cell CO2 concentration CO2_r
CO2_s µmol mol-1 Sample cell CO2 concentration CO2_s
Fan_speed rpm Chamber fan rotation rate Fan_speed
Flow µmol s-1 Flow rate into chamber Flow
H2O_a mmol mol-1 Sample cell H2O w/o match adjust H2O_a
H2O_r mmol mol-1 Reference cell H2O concentration H2O_r
H2O_s mmol mol-1 Sample cell H2O concentration H2O_s
Offset °C Offset built-in to Tleaf Offset
Offset2 °C Offset built-in to Tleaf2 Offset2
Qamb_in µmol m-2 s-1 In-chamber ambient PPFD PPFD_in
Qamb_out µmol m-2 s-1 External ambient PPFD PPFD_out
ΔPcham kPa Chamber overpressure Pchamber
Pa kPa Atmospheric pressure Press
TIME s Seconds since Jan 1970 TIME
Tair °C Chamber air temperature Tchamber
Tleaf °C Leaf thermocouple #1 Tleaf
Tleaf2 °C Leaf thermocouple #2 Tleaf2

Meas2

Table 4‑29. Secondary head measurements, of interest, but not directly used in gas exchange computations.
Display Label Units Description Internal Name
CO2_b µmol mol-1 Reference cell CO2 w/o match adjust CO2_b
ΔCO2 µmol mol-1 Sample - Reference CO2 CO2_d
CO2_r_d µmol mol-1 Reference cell CO2, dry mole fraction CO2_r_d
CO2_s_d µmol mol-1 Sample cell CO2, dry mole fraction CO2_s_d
H2O_b mmol mol-1 Reference cell H2O w/o match adjust H2O_b
ΔH2O mmol mol-1 Sample - Reference H2O H2O_d
Td_r °C Reference cell dew point Td_r
Td_s °C Sample cell dew point Td_s
e_r kPa Reference cell vapor pressure e_r
e_s kPa Sample cell vapor pressure e_s

MPF

Table 4‑30. Settings and results specific to the latest MultiPhase Flash.
Display Label Units Description Internal Name
ID ID of this MPF flash EVENT_ID
P1_Fmax Fmax in Phase 1 P1_MAXF
P2_dQdt mol m-2 s-2 Phase 2 dQ/dt P2_DQDT
P3_ΔF Fmeasured - Fpredicted Phase 3 P3_DELTAF
P1_dur ms Phase 1 duration PHASE1_DURATION
P2_dur ms Phase 2 duration PHASE2_DURATION
P3_dur ms Phase 3 duration PHASE3_DURATION
P1_Qmax µmol m-2 s-1 Qmax in Phase 1 QMAX

pH_cal

Table 4‑31. Constants and settings associated with the Aquatic Chamber pH probe.
Display Label Units Description Internal Name
Cal 1 T °C Buffer temperature cal1_T
Cal 1 Signal V Buffer signal cal1_V
Use Cal 1 cal1_on
Cal 1 pH pH Buffer pH cal1_pH
Cal 2 T °C Buffer temperature cal2_T
Cal 2 Signal V Buffer signal cal2_V
Use Cal 2 cal2_on
Cal 2 pH pH Buffer pH cal2_pH
Cal Factor Probe calibration adjustment factor slope
Cal 0 Signal V Signal at neutral pH std_V
Cal 0 pH Neutral pH std_pH

QConst

Table 4‑32. Light weighting factors used in the computation of LeafQ results.
Display Label Units Description Internal Name
fQ_Amb_in Fraction Q from Amb_in fQ_Amb_in
fQ_Amb_out Fraction Q from Amb_out fQ_Amb_out
fQ_ConsoleLS Fraction Q from ConsoleLS fQ_ConsoleLS
fQ_Flr Fraction Q from Flr fQ_Flr
fQ_HeadLS Fraction Q from HeadLS fQ_HeadLS

Raw

Table 4‑33. Low-level readings from the head that are used in to computing the Meas and Meas2 values.
Display Label Units Description Internal Name
Flow_s_v V Sample cell flow signal Flow_a_v
Flow_r_v V Reference cell flow signal Flow_b_v
VPchamber V Chamber pressure sensor signal VPchamber
Vflow V Flow meter signal Vflow
Wc_s Absorbing counts, CO2 sample Wc_a
Wc_r Absorbing counts, CO2 ref Wc_b
Wco_s Non-absorbing counts, CO2 sample Wco_a
Wco_r Non-absorbing counts, CO2 ref Wco_b
Ww_s Absorbing counts, H2O sample Ww_a
Ww_r Absorbing counts, H2O ref Ww_b
Wwo_s Non-absorbing counts, H2O sample Wwo_a
Wwo_r Non-absorbing counts, H2O ref Wwo_b
abs_c_a CO2 absorptance cell A abs_c_a
abs_c_b CO2 absorptance cell B abs_c_b
abs_h_a H2O absorptance cell A abs_h_a
abs_h_b H2O absorptance cell B abs_h_b
Tleaf2_mv mV Leaf2 temp V leaf2_t_mv
Tleaf_mv mV Leaf temp V leaf_t_mv

SoilConfig

Settings used for the soil chamber.

Table 4‑34[caption]
Display Label Units Description Internal Name
Dead band s Delay after closing DeadBand
# Reps Repetitions per measurement NumReps
Soil Type For Stevens Probe soiltype
Pump Speed % Circulation pump speed speed
ID Tag Measurement ID tag
Extra s Time between repetitions textra
Rep duration s Time chamber is closed tmax
Tsoil Sensor for TSoil tss

SoilConst

Table 4‑35. Computational constants used for the soil chamber.
Display Label Units Description Internal Name
Vcham cm3 Chamber volume ChamberVolume
Offset cm Collar height CollarHt
Ctarget µmol mol-1 Compute flux here Ctarget
Area cm2 Exposed soil area SoilArea
Virga cm3 Non-chamber Volume SysVolume
Vtotal cm3 System volume + collar volume TotalVolume

SoilData

Table 4‑36. Real-time data available during a soil chamber observation.
Display Label Units Description Internal Name
CO2 µmol mol-1 CO2 in soil chamber CO2
CStatus Chamber location status CStatus
Cdry µmol mol-1 Dry CO2 in soil chamber Cdry
Elapsed s Time chamber has been closed Elapsed
Flux_to µmol m-2 s-1 Estimate of Flux_to during a measurement F_avg
H2O mmol mol-1 H2O in soil chamber H2O
MStatus Measurement status MStatus
MStatusN Measurement status index (0-5) MStatusN
Msoil m3 m-3 Soil moisture wfv Msoil
Pressure kPa Atmospheric Pressure Pressure
Progress % Percent completed of measurement Progress
RH % Relative Humidity in soil chamber RH
Rep Rep Status Rep
RepProg % Percent completed of current rep RepProg
STATE Chamber state value STATE
TIME s Time_t of data record TIME
Tair_sc °C Air temp in soil chamber Tchamber
Tsoil °C Soil temperature Tsoil
Vbellows V Bellows signal VBELLOWS
dCdry/dt µmol mol-1 s-1 Rate of change Cdry dCdry/dt

SoilComp2

Table 4‑37. Computations available following a soil chamber observation.
Display Label Units Description Internal Name
Cdry_o µmol mol-1 Initial Cdry Cdry_o
F_CV % CV of flux F_CV
Flux_to µmol m-2 s-1 Flux computed at Cdry_o F_o
Flux_target µmol m-2 s-1 Flux computed at target concentration F_target
MeasNum Measurement number MeasNum
Ms_avg m3 m-3 Soil moisture wfv average Ms_avg
N Number points in regression N
P_to kPa Initial atmospheric pressure P_o
RepNum Rep number RepNum
T_to °C Initial air temperature T_o
Ts_avg °C Soil temperature average Ts_avg
W_to mmol mol-1 Initial water concentration W_o
intercept µmol mol-1 s-1 Slope of dCdry/dt as function of Cdry intercept
r2 r2 dCdry/dt as function of Cdry r2
slope s-1 Slope of dCdry/dt as function of Cdry slope

Status

Table 4‑38. Primary status information on the state of the system.
Display Label Units Description Internal Name
CO2_% % CO2 injector amount on CO2_percent
CO2_r_sp µmol mol-1 CO2 mixer algorithmic setpoint CO2_r_setpoint
DIAG Head diagnostic value. Normal = 2 or 3 DIAG
Desiccant_% % Desiccant valve position Desiccant_percent
Flow_r µmol s-1 Ref cell flow Flow_r
Flow_s µmol s-1 Sample cell flow Flow_s
H2O_r_sp mmol mol-1 H2O algorithmic setpoint H2O_r_setpoint
Txchg_sp °C Heat exchange algorithmic setpoint Heatx_setpoint
Humidifier_% % Humidifier valve position Humidifier_percent
SS_s % Sample cell signal strength SS_a
SS_r % Reference cell signal strength SS_b
Ts °C A cell inlet temperature Ta
Tr °C B cell inlet temperature Tb
Tchopper °C IRGA chopper temperature Tchopper
Tirga °C IRGA block temperature Tirga_block
Txchg °C Heat exchanger temperature Txchg

Status2

Table 4‑39. Secondary status information on the state of the system.
Display Label Units Description Internal Name
AccCO2_soda mg Absorbed CO2 (mg) by soda lime AccCO2_soda
AccH2O_des mg Absorbed H2O (mg) by desiccant AccH2O_des
AccH2O_hum mg Added H2O (mg) from humidifier AccH2O_hum
CO2_hrs hrs CO2 cartridge hours CO2_hrs
Console_H2O mmol mol-1 H2O after humidifier Console_H2O
Console_RH % RH after humidifier Console_RH
Console_T °C T after humidifier Console_RH_T
Fan_% % Fan speed in percent Fan_percent
Flow_% % Flow split position, -100 to +100 Flow_percent
Pump Pump status: 0=off, 0.5=min, 1=low, 2=med, 3=high Pump
Tleaf_j °C Tleaf junction temp TleafJunction
Tleaf2_j °C Tleaf2 junction temp TleafJunction2
Tchp_pwm V Chopper temp PWM in V chopper_t_pwm_v
diag_12v V 12v V test point diag_12v
diag_20v V 20v V test point diag_20v
diag_3_3vf V 3.3vf V test point diag_3_3vf
diag_5_4v V 5.4v V test point diag_5_4v
diag_5va V 5va V test point diag_5va
Txchg_pwm V Heat exchanger temp PWM in V heatx_t_pwm_v

Stability

Table 4‑40. Content depends on what variables are being targeted for stability checking.
Display Label Units Description Internal Name
ΔCO2:MN µmol mol-1 Mean of ΔCO2 CO2_d.Meas2:MN
ΔCO2:OK Stable status ΔCO2 CO2_d.Meas2:OK
ΔCO2:SD µmol mol-1 Standard deviation of ΔCO2 CO2_d.Meas2:SD
ΔCO2:SLP µmol mol-1 min-1 Rate of change of ΔCO2 CO2_d.Meas2:SLP
F:MN Mean of F FLUOR.FlrLS:MN
F:OK Stable status F FLUOR.FlrLS:OK
F:SD Standard deviation of F FLUOR.FlrLS:SD
F:SLP min-1 Rate of change of F FLUOR.FlrLS:SLP
ΔH2O:MN mmol mol-1 Mean of ΔH2O H2O_d.Meas2:MN
ΔH2O:OK Stable status ΔH2O H2O_d.Meas2:OK
ΔH2O:SD mmol mol-1 Standard deviation of ΔH2O H2O_d.Meas2:SD
ΔH2O:SLP mmol mol-1 min-1 Rate of change of ΔH2O H2O_d.Meas2:SLP
Stable Number of stable items Stable
State stable # / total # State
Total Number of items tracked Total

SysObs

Table 4‑41. System values associated with the latest logged observation.
Display Label Units Description Internal Name
averaging s Additional averaging on latest observation averaging
date Date & time of last observation date
elapsed s Seconds since first observation elapsed
hhmmss HH:MM:SS of last observation hhmmss
obs Number observations logged obs
time s Seconds since Jan 1970 time

SysConst

Table 4‑42. System constants associated with the head computations.
Display Label Units Description Internal Name
AvgTime sec Averaging time for head measurements AvgTime
Oxygen % Oxygen concentration Oxygen

UserDefCon

Table 4‑43. Content depends on what user defined constants are presently active.
Display Label Units Description Internal Name
myConstant km Distance from the sun myConstant

UserDefVar

Table 4‑44. Content depends on what user defined variables are presently active.
Display Label Units Description Internal Name
myVariable flow times area myVariable

UserCal

Table 4‑45. A selection of the current head user calibration values.
Display Label Units Description Internal Name
CO2_s_span1 User span 1 for sample CO2 co2aspan1
CO2_s_span2 User span 2 for sample CO2 co2aspan2
CO2_s_zero User zero for sample CO2 co2azero
CO2_r_span1 User span 1 for sample CO2 co2bspan1
CO2_r_span2 User span 2 for sample CO2 co2bspan2
CO2_r_zero User zero for reference CO2 co2bzero
Fs_zero User zero for sample flow meter flowazero
Fr_zero User zero for reference flow meter flowbzero
F_zero User zero for main flow meter flowmeterzero
H2O_s_span1 User span 1 for sample H2O h2oaspan1
H2O_s_span2 User span 2 for sample H2O h2oaspan2
H2O_s_zero User zero for sample H2O h2oazero
H2O_r_span1 User span 1 for sample H2O h2obspan1
H2O_r_span2 User span 2 for sample H2O h2obspan2
H2O_r_zero User zero for reference H2O h2obzero

Note: In a data file, a value of sys::time and GasEx::Time will be different if the data was logged with extra averaging time. The time for sys::time is always the actual time data was logged, while GasEx::time lags behind by an amount that is equal to T/2, where T is the averaging time.