Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 74)

Appendix B. Public Variables
TABLE B-1. CPEC200 public variables
When Defined Usage Variable Name Units Description
always DIAG BattVolt_OK Boolean flag: False if the
CPEC200 system has shut
down because the supply
voltage was too low
always INFO panel_tmpr ºC Temperature of the datalogger
wiring panel
always INFO process_time µs Time to process the scan (a
copy of ProcessTime from the
Status table)
always INFO buff_depth Number of scans in the pipeline
buffer that have not yet been
processed (a copy of BuffDepth
from the Status table)
always DIAG buff_depth_OK Boolean flag: False if
buff_depth exceeds the limit
(disables pump speed and valve
flow controls)
always INFO intake_heater V Voltage applied to the EC155
intake heater
Leaf_Wetness_Sensor INFO leaf_wetness Measurement from an optional
leaf wetness sensor (used to
control intake heater voltage)
always CONFIG BATT_LOWLIMIT V CPEC200 will power down if
supply voltage falls below this
limit
always CONFIG BATT_DEADBAND V CPEC200 will power up if
supply voltage rises this much
above the lower limit
always CONFIG SONIC_AZIMUTH degrees Angle between true north and
the direction the CSAT3A is
pointing
always CONFIG BANDWIDTH Hz EC100 digital filter bandwidth
always CONFIG AMB_PRESS_NOMIN
AL
kPa nominal ambient pressure for
CPEC200 elevation
always CONFIG PUMP_SETPT LPM Flow setpoint for sample pump
speed control
always CONFIG CAL_INTERVAL min Time between automatic
zero/span sequences
always CONFIG CAL_TIMEOFFSET min Time offset for starting
automatic zero/span sequences
always CONFIG ZERO_TIME s Time to flow zero gas
always CONFIG SPAN_TIME s Time to flow CO
2
span gas
always CONFIG CAL_FLOW_SETPT LPM Flow setpoint for zero/span
always CONFIG CO2_SPAN_PPM µmol∙mol -1 CO
2
mixing ratio in the CO
2
span cylinder
always CONFIG USE_DIFF_PRESS Set = True to enable the EC155
differential pressure sensor
always CONFIG CHECK_ZERO Set = True to enable automatic
zero/span sequences
B-4