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

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.
Sensors 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.
LDS 6
Operating Instructions, 01/2009, A5E00295894-05
Transmission Alarms
Action
Clean windows.
Align sensors.
Make sure purging is working. Clean purging tubes.
Adjust the potentiometer of the detector.
Alarms
5.4 Transmission Alarm
69