Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 82)

Appendix C. Output Variables
at seven records per sequence, and sequences run every hour). The CPU has
storage allocated for 500 records (3 days).
The zero_span table is defined only if VALVE_MODULE = True. As a
result, only the last five values, associated with the scrub module, are optional
depending on the SCRUB_MODULE compile switch.
The value of the compile switches as shown in TABLE C-3 depends on the
constants as described in Section 5.4.2, Compile Switches. The code shown in
the table can be either V, S, or a combination of two of the codes.
 V is defined if VALVE_MODULE = True
 S is defined if SCRUB_MODULE = True and
VALVE_MODULE = True
TABLE C-3. Values stored in table zero_ span
Compile
Switch Variable Name Units Description
V TIMESTAMP TS Date and time the record was measured
V RECORD RN Record number
V Sequence_Step Status of the zero/span sequence (see Section 6.2, Automatic
Zero and Span, for details)
V ValveNumber Valve number (0 to 6); determines which zero/span valve is
selected
V CO2_Avg µmol∙mol -1 Average of CO
2
V H2O_Avg mmol∙mol -1 Average of H
2
O
V diag_irga_Avg Average of diag_irga
V cell_tmpr_Avg ºC Average cell temperature
V cell_press_Avg kPa Average cell pressure
V CO2_signal_Avg Average CO
2
signal
V H2O_signal_Avg Average H
2
O signal
V diff_press_Avg kPa Average differential pressure
V source_tmpr_Avg ºC Average source temperature
V pump_ON_Avg Fraction of time the pump was on
V pump_flow_Avg LPM Average pump flow
V pump_control_Avg Average pump control value
V pump_press_Avg kPa Average pump pressure
V diag_CPEC_Avg Average of diag_cpec
V fast_samples Number of samples included in the averages for values
measured in the main scan
V buff_depth_Max Maximum buffer depth during the output interval
V process_time_Avg µsec Average processing time
V PressOffset kPa Sample cell pressure measured with no flow; used to infer
valve flow
V valve_flow_Avg LPM Average zero/span flow
V valveControl_Avg Average of zero/span flow control valve; can be from 0
(closed) to 1 (open)
V PumpTmprOK_Avg Fraction of time the pump temperature was within its
operating range
V pump_tmpr_Avg ºC Average pump temperature
V pump_heat_Avg Fraction of time the pump heater was on
V pump_fan_Avg Fraction of time the pump fan was on
C-6