Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 73)

Appendix B. Public Variables
TABLE B-1. CPEC200 public variables
When Defined Usage Variable Name Units Description
VALVE_MODULE INFO/USER valve_number Valve number (0 to 6);
determines which zero/span
valve is selected
VALVE_MODULE USER DO_P_offset Set = True to measure the
pressure offset
VALVE_MODULE INFO press_offset
kPa
Sample cell pressure measured
with no flow; used to infer
valve flow
VALVE_MODULE INFO/USER valveTctl_ON Set = True to enable valve
module temperature control
VALVE_MODULE INFO valve_tmpr
ºC
Temperature of the valve
module
VALVE_MODULE DIAG valve_tmprOK Boolean flag: True if the valve
temperature is within its
operating range
VALVE_MODULE INFO valveHeat_ON Boolean flag: True if the valve
heater is on
VALVE_MODULE INFO valveFan_ON Boolean flag: True if the valve
fan is on
VALVE_MODULE INFO valve_flow LPM Zero/span flow
VALVE_MODULE DIAG valve_flow_OK Boolean flag: True if
valve_flow is within the normal
range
VALVE_MODULE INFO valveControl Zero/span flow control valve;
can be from 0 (closed) to 1
(open)
SCRUB_MODULE INFO scrub_tmpr
ºC
Temperature of the scrub
module
SCRUB_MODULE DIAG scrub_tmprOK Boolean flag: True if the scrub
module temperature is within
its operating range
SCRUB_MODULE INFO scrubHeat_ON Boolean flag: True if the scrub
module heater is on
SCRUB_MODULE INFO scrubFan_ON Boolean flag: True if the scrub
module fan is on
SCRUB_MODULE INFO scrub_press
kPa
Pressure measured at the scrub
pump outlet
VALVE_MODULE INFO/USER DO_zero Set = True to send the CO
2
and
H
2
O zero command to the
IRGA
VALVE_MODULE INFO/USER DO_CO2_span Set = True to send the CO
2
span command to the IRGA
VALVE_MODULE USER H2OSpanDewPt
ºC
Setpoint temperature on
dewpoint generator; used for
H
2
O span
VALVE_MODULE USER DO_H2O_span Set = True to send the H
2
O
span command to the IRGA
always INFO BattVolt
V
Supply voltage; measured
inside datalogger after diode
voltage drop
B-3