Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 86)

Appendix C. Output Variables
TABLE C-4. Values stored in table message_log
Compile
Switch
Variable
Name Units Description
V valve_number Valve number (0 to 6);
determines which zero/span
valve is selected
V press_offset kPa Sample cell pressure measured
with no flow; used to infer valve
flow
V valveTctl_ON Boolean flag: True if valve
module temperature control is
enabled
V valve_flow LPM Zero/span flow
V valve_tmpr ºC Temperature of the valve
module
V, S scrub_tmpr ºC Temperature of the scrub
module
V, S scrub_press kPa Pressure measured at the scrub
pump outlet
buff_depth Number of scans in the pipeline
buffer that have not yet been
processed (a copy of BuffDepth
from the Status table)
config_history
The user may change the configuration of the CPEC200 program at any time,
as discussed in Section 5.4, Configure the Program. All the configuration
variables and compile switches are written to the config_history table at
startup, when a configuration variable is changed, and once a day at 15 minutes
past midnight. This provides a historical record to be used as a troubleshooting
aid.
The values stored in table config_history are shown in TABLE C-5.
TABLE C-5. Values stored in table config_history
Variable Name Units Description
TIMESTAMP TS Date and time the record was written
RECORD RN record number
BATT_LOWLIMIT V CPEC200 will power down if supply voltage falls below this limit
BATT_DEADBAND V CPEC200 will power up if supply voltage rises this much above
the lower limit
SONIC_AZIMUTH degrees Angle between true north and the direction the CSAT3A is
pointing
BANDWIDTH Hz EC100 digital filter bandwidth
AMB_PRESS_NOMINAL kPa Nominal ambient pressure for CPEC200 elevation
PUMP_SETPT LPM Flow setpoint for sample pump speed control
CAL_INTERVAL min Time between automatic zero/span sequences
CAL_TIMEOFFSET min Time offset for starting automatic zero/span sequences
ZERO_TIME s Time to flow zero gas
SPAN_TIME s Time to flow CO
2
span gas
CAL_FLOW_SETPT LPM Flow setpoint for zero/span
C-10