Vaisala FS11 - Warnings; Warning Messages

USER'S GUIDE ____________________________________________________________________
162 __________________________________________________________________ M211187EN-C
Alarm Message
Probable Cause
Remedy
TRANSMITTER
TOTAL
REFLECTION
MEASUREMENT
FAILURE
TRANSMITTER
BACKSCATTER
MEASUREMENT
FAILURE
Either of the transmitter
monitoring subsystems does
not provide operational data.
Control cable between the transmitter and
FSC102 is broken or loose; check the cable.
CLOGGING ALARM
A very high backscatter signal
has been detected. The optical
path is nearly blocked. The
instrument is in an
unoperational condition. The
data is invalidated.
Check the windows and the hoods of the
optics heads for obstacles such as snow.
Remove the possible disturbance and clean
the windows following the instructions given
in section
Cleaning FSM102 Windows on
page 125.
Warnings
Table 31 Warning Messages
Warning Message
Probable Cause
Remedy
WINDOW
CONTAMINATED
Window contamination
increased, contamination
compensation still reliable.
Clean the windows following the instructions
given in section Cleaning FSM102 Windows
on page 125.
In cold and windy environment
when the hood heaters are not
used, the dew heater power
cannot rise the temperature
enough to prevent dew
condensation, which can
generate a WINDOW
CONTAMINATED warning.
Turn on the hood heaters.
BATTERY LOW
Backup battery voltage low
(<11 VDC), limited operation
time left.
Connect the line voltage or replace the
battery.
If no backup battery is installed,
the line voltage selector switch
is in the wrong position.
Check that the switch in the FSP103 board
is in the position 115 if you are using line
voltages between 100...127 VAC.
LED AGED
LED aged, need for electrical
driving power increased.
Limited operation time left.
Replace the transmitter module FST102 in
the near future.