Chapter 5 ________________________________________________________________ Operation
VAISALA ______________________________________________________________________ 169
Table 24 LT31 Transmitter: Window Transmitter Module (Byte
Number 31)
Code Explanation Comment
0 OK, normal
operation
2 Light source
aging warning
Transmitter derating signal
reached warning limit.
4 Hardware
warning
Internal monitoring alarm signal
exceeded limit.
8 Hardware error Examples:
Intensity signal out of limits.
EEPROM and/or temperature
sensor failure.
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.
The byte shown in Table 25 below indicates the status of the
measurement CPU LTC112 which is located in the transmitter
measurement unit LTM112 of the LTT111 (LT31 transmitter).
Table 25 LT31 Transmitter: Measurement CPU (Byte Number
32)
Code Explanation Comment
0 OK, normal
operation
2 Window receiver
saturated
Direct or indirect solar radiation.
4 Hardware
warning
Internal monitoring alarm signal
exceeded limit
8 Hardware error Examples:
EEPROM and/or temperature
sensor failure.
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.
The byte shown in Table 26 on page 170 indicates the status of the optics
alignment mechanism and the window heater unit located in the
transmitter measurement unit LTM112 of the LTT111 (LT31
transmitter).
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