CS120A and CS125 Visibility and Present Weather Sensors
32
System alarms break down
Alarm
Range
Severity
(2)
Definition
Hood
temperature
0-3
0
1
1
2
0 = Temperature is within operating conditions
1 = Too low. Less than -40°C
2 = Too high. Over 80°C
3 = No sensor detected or below -56°C
External
temperature
(CS125 only)
0-3
0
1
1
2
0 = Temperature is within operating conditions
1 = Too low. Less than -40°C
2 = Too high. Over 80°C
3 = No sensor detected or below -54°C
Signature
error
0-4
0
3
2
2
3
0 = No fault
1 = OS signature error at power up
2 = User memory signature did not match when last read
3 = User memory fault at power up. Secondary copy was
reinstated to correct error.
4 = User memory fault at power up. No secondary copy was
found to reinstate. Factory defaults have been reinstated.
System will need re-calibrating
Flash read
error
0-1
0
3
0 = No errors
1 = One or more errors reading user variables from flash
occurred
Flash write
error
0-1
0
3
0 = No errors
1 = One or more errors writing user variables to flash occurred
Particle limit
(CS125 only)
0-1
0
1
0 = No errors
1 = More particles detected than can be processed
Errors are checked every 10 seconds and the next message output is updated
with the following exceptions:
Signature error is checked and reset at power up.
Flash read and write errors are checked when flash memory is updated, for
example when changes are made through the memory structure. They are also
reset on power up.
Particle limit is checked every minute and reset when read.
Particle count*
Range
Definition
0-7200
Value represented by an integer number of the current number of particle per
minute. (-99 indicates either an error or that the sensor has been powered less than
one minute)
Intensity value*
Range
Definition
0 - 999.99
Value represented by a single precision value of the last minutes rainfall intensity
in mm/hr (-99 indicates either an error or that the sensor has been powered up less
than one minute)
