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.