Transmission Alarm; Limit Alarm; Function Control Alarm - Siemens LDS 6 Operating Instructions Manual

Alarms

5.6 Function control alarm

5.4

Transmission alarm

The alarm (TR) appears either if the transmission falls below a limit defined by function 52 or if
it exceeds a fixed limit. The following table shows the possible reasons that can set it:
Table 5-4
Possible Causes
Dirty windows.
Optics housings not aligned.
Purging not working.
Transmission too high.
5.5

Limit alarm

The limit alarm (LIM) appears if the signal exceeds the limits set by function 51.
5.6 Function control alarm
The function control (CTRL) is activated when the analyzer performs an action during which the
measurement value may be incorrect. The triggering of CTRL should normally not require an
action from the user. The following list shows some possible causes to why CTRL is activated:
Possible Causes
• Start-up procedure is active.
• Analyzer is de-coded.
• Analyzer is communicating with external service software.
• Analyzer is shutting down.
• Analyzer is saving data to EEProm or Flash memory.
62
Transmission Alarms
Action
Clean windows.
Align optics housings.
Make sure purging is working. Clean purging tubes.
Adjust the potentiometer of the detector.
Operating Instructions, 01/2022, A5E00295894-10
LDS 6