Campbell Scientific AP200 CO2/H2O Atmospheric Profile System - Manual (Page 77)

Appendix C. Public Variables
Some of the variables in the AP200’s CRBasic program are included in the
Public table. These public variables may be displayed or edited with a
keyboard display or PC. Other program variables are hidden from the user to
reduce clutter in the Public table. Many of these public variables are saved in
the output tables. Some of the public variables allow the user to set the
operation of the system or to give diagnostic information. The intended usage
of the public variables is categorized as follows:
IRGA measured directly by the IRGA
TAIR air temperature (defined only if N_AirTemps > 0)
DIAG diagnostic
USER user setting
INFO provides information on system status
INFO/USER conditional user setting (may set if the sequence is stopped)
CONFIG system configuration parameter - saved in file
sys_conf_var.dat.
The public variables are listed in TABLE C-1.
TABLE C-1. Public Variables
Usage Variable Name Units Description
RecNum RN record number
TimeStamp TS date and time the record was measured
DIAG diag_AP200
AP200 diagnostic word (nonzero value indicates a
problem detected)
INFO interval_counter
number of scans since the start of this output interval (half
hour)
IRGA CO2 ppm CO
2
concentration measured by the IRGA
IRGA H2O ppt H
2
O concentration measured by the IRGA
IRGA cell_tmpr °C IRGA sample cell temperature
IRGA cell_press kPa IRGA sample cell pressure
IRGA Td_cell °C dewpoint temperature measured by the IRGA
INFO Td_ambient °C Td_cell, corrected to ambient pressure
DIAG sample_flow ml·min -1 sample flow to the IRGA
USER STARTsequence set = to True to start the automatic valve sequence
USER STOPsequence set = to True to stop the automatic valve sequence
C-1