User's Guide ________________________________________________________
52 _____________________________________________________ M210283en-A
Alarms
NOTE
The alarms below cause the frequency output to drop to
zero.
Table 8 Alarm Messages
Alarm Message Probable Cause Remedy
SENSOR
SENSITIVITY
Sensor does not properly
detect changes in the
illumination level
Replace the LMB201 board
CALIBRATING LM21 is performing a
calibration procedure
because it has detected the
LMA21 unit
No action is needed. The alarm
will disappear when the
calibrator is disconnected
BACKSCATTER
HIGH
Backscatter signal level
increased over 90 %. There
is a disturbance in the light
path.
Clean the window and the hood
of the measurement head
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