Vaisala LT31 - Table 16 LT31 Power Supply (Byte Number 23); Table 17 LT31 Auto-Calibration (Byte Number 24); Table 18 LT31 Window Contamination (Byte Number 25)

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166 _________________________________________________________________ M210667EN-C
Table 16 LT31 Power Supply (Byte Number 23)
Code Explanation Comment
0 OK
1 Battery mode No AC power.
LT31 is working on a backup battery.
2 Low backup
battery
voltage
LT31 will shut
down soon
No AC power.
LT31 is working on a backup battery.
NOTE
The listed status codes do not cover all possible cases. Combinations are
possible if applicable. If, for example, code 1 and code 2 occur at the
same time, it will lead to code 3.
For decoding the auto-calibration status, see Table 17 below.
Table 17 LT31 Auto-calibration (Byte Number 24)
Code Explanation Comment
0 OK
1 Auto-calibration
situation
Auto-calibration situation detected.
Auto-calibration in process.
4 Auto-calibration
not available
PWD not configured.
8 Auto-calibration
switched off
Example:
PWD is missing.
NOTE
The listed status codes do not cover all possible cases. Combinations are
possible if applicable. If, for example, code 1 and code 2 occur at the
same time, it will lead to code 3.
For decoding the window contamination status, see Table 18 below.
Table 18 LT31 Window Contamination (Byte Number 25)
Code Explanation Comment
0 OK
1 Contamination
warning level 1
Cleaning required soon.
2 Contamination
warning level 2
Immediate cleaning required.
4 Contamination
level too high
Contamination too high.
8 Contamination
measurement
error