Biral SWS-100-LW: SWS-200-LW, User Manual

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Maintenance Procedures Section 4
36
General Checks
10% (default value) or 30%. This Self-test code can be one of three characters,
O, X or F dependent on the contamination reading received. These have the
following meaning:
“O”: Window contamination is less than 10% (Default value; can
be adjusted by the user, see command WTx, section 3.1).
No action required.
“X”: Window contamination warning. The window contamination
is between 10% and 30% for at least 5 minutes. The
visibility reading provided is corrected utilising this
contamination figure, but it is recommended that the
windows are cleaned at the earliest possible opportunity.
“F”: Window contamination fault. The window contamination is
above 30%. Although the visibility reading is still corrected
using this contamination figure, the accuracy may
deteriorate as the contamination increases. The windows
require cleaning.
NOTE: The ALS has an additional code of “S”. This indicates that the
sensor is saturated with a VERY bright light source (such as direct
view of the sun). Although the reported light level will be in error,
it can be implied that the true ambient light level is high.
4.2.3 Least Significant Character (Other Self-Test errors)
A variety of operating parameters are regularly checked against normal
operational figures as an early warning of possible sensor faults. This character
indicates whether all parameters other than window contamination are normal.
This Self-test code can be one of two characters, O, or X. These have the
following meaning:
“O”: No Fault. No action required.
“X”: Internal error. Send command “R?” to list all internally
monitored parameters. Check against section 3.1.1 to
determine the cause of this error. Send command “RST to
restart the sensor. If the fault persists, arrange for the
sensor to be serviced at the earliest possible opportunity.