Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 72)

Appendix B. Public Variables
TABLE B-1. CPEC200 public variables
When Defined Usage Variable Name Units Description
always SONIC Ts ºC Sonic virtual temperature
always SONIC diag_sonic CSAT3A diagnostic word
always IRGA CO2
µmol∙mol -1
CO
2
mixing ratio, relative to
dry air
always IRGA H2O
µmol∙mol -1
H
2
O vapor mixing ratio,
relative to dry air
always IRGA diag_irga EC155 diagnostic word
always IRGA cell_tmpr ºC Temperature of the sample cell
always IRGA cell_press kPa pressure in the sample cell
always IRGA CO2_signal Relative strength of the infrared
signal in the CO
2
absorption
band
always IRGA H2O_signal Relative strength of the infrared
signal in the H
2
O absorption
band
always IRGA diff_press
kPa
Differential pressure (sample
cell, relative to ambient)
always IRGA source_tmpr
ºC
Temperature measured inside
the source housing
always IRGA not_used Placeholder variable to receive
a value from the EC100 (used
for an EC150, but not used for
an EC155)
always INFO Td_cell
ºC
H
2
O converted to dewpoint
temperature in the sample cell
always INFO Td_ambient
ºC
Dewpoint temperature
corrected for pressure
difference between the sample
cell and ambient
always USER pump_ON set = True to enable the sample
pump
always INFO pump_flow
LPM
sample pump speed, converted
to volumetric flow rate
always INFO pump_control pump speed control variable;
can be from 0 (off) to 1 (full
speed)
always INFO pump_press
kPa
pressure measured at the
sample pump inlet
always INFO pump_tmpr ºC temperature of the pump
always DIAG pump_tmpr_OK Boolean flag: True if the pump
temperature is within its
operating range
always INFO pump_heat_ON Boolean flag: True if the pump
heater is on
always INFO pump_fan_ON Boolean flag: True if the pump
fan is on
VALVE_MODULE USER STARTsequence Set = True to manually initiate
a zero/span sequence
B-2