
Appendix C. Output Variables
Compile Switches. The code shown in the table can be either V, S, or a
combination of two of the codes.
V is defined if VALVE_MODULE = True
S is defined if SCRUB_MODULE = True and
VALVE_MODULE = True
TABLE C-4. Values stored in table message_log
Date and time the record was
written
Message explaining why the
record was written
Operating state of the CPEC200
Overall status of the CPEC200
Status of the sample pump
Status of the valve module
Temperature of the datalogger
wiring panel
Supply voltage; measured inside
datalogger after diode voltage
Sonic virtual temperature
2
mixing ratio, relative to dry
air
2
O vapor mixing ratio, relative
to dry air
Relative strength of the infrared
signal in the CO
2
absorption
relative strength of the infrared
signal in the H
2
O absorption
differential pressure (sample
cell, relative to ambient)
temperature measured inside the
source housing
Boolean flag: True if sample
pump is on
Sample pump speed, converted
to volumetric flow rate
Pressure measured at the sample
pump inlet
Status of the zero/span sequence
(see Section 6.2, Automatic
Zero and Span, for details)
How long (number of scans) the
sequence has been at this step
C-9
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