Campbell CS120A, Instruction Manual

Page: 42 / 94

CS120A and CS125 Visibility and Present Weather Sensors
30
System alarms break down
Alarm Range Severity
(2)
Definition
Emitter failure
(emitter hoods
main LED
output power
level) 0-2 0
3
3 0 = Everything is within normal parameters
1 = Light output level too low
2 = Light output level too high
Emitter lens
dirty 0-3 0
3
1
2
0 = OK. The reported attenuation is below 10%
1 = Reported window signal value is out of range (>30%)
Possible sensor fault or hood could be blocked
2 = Slight dirt build up (10% signal attenuation or higher)
3 = High level of dirt build up (>20%)
Emitter
temperature 0-3 0
1
1
3 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
Detector lens
dirty 0-3 0
3
1
2
0 = OK. The reported attenuation is below 10%
1 = Reported window signal value is out of range (>30%)
Possible sensor fault or hood could be blocked
2 = Slight dirt build up (10% signal attenuation or higher)
3 = High level of dirt build up (>20%)
Detector
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 -54°C
Detector DC
saturation
level (amount
of background
light seen by
the detector
hood) 0-1 0
2 0 = Within limits
1 = Saturated. The sensor may not be able to perform visibility
readings in some circumstances. Possibly due to high level of
reflections into the detector.
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: