Code Definition
A :
Data logger off
A? :
Data logger off an indeterminate number of hours
An :
Data logger off n hours; daily averages may be in error
B :
Data logger off
C :
Sensor off; missing value reported
D :
Sensor malfunction produced bad values; values set to missing;
E :
Sensor noisy; values of uncertain quality
F :
Sensor calibration error; correction factors h
