Campbell CS120A, Руководство пользователя

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User Guide
19
Averaging duration break down
ID Definition
1 One minute average
10 Ten minute average
In accordance with WMO requirements the CS120A produces measurement that
are either one or ten minute rolling averages that are updated at the chosen output
interval or when the sensor is polled. Those averages are not direct averages of
MOR measurements but are averages of extinction coefficient and that average is
then used to calculate the MOR for that period. As the relationship between
extinction coefficient and MOR is not linear it is possible to see quite rapid
changes in MOR that might not be expected if the result was a rolling average of
MOR. Please consider this, especially when testing the sensor with artificial
obscurants or using the calibration disc.
User alarms
Alarm Range Definition
1 0-1 Visibility either less or greater than a user
specified threshold
2 0-1 Visibility either less or greater than a user
specified threshold
System alarms break down
Alarm Range Severity
(2)
Definition
Emitter failure 0-2
(1)
3 The emitter hoods main LED output power level.
0 = Everything is within normal parameters
1 = Light output level too low
2 = Light output level too high
Emitter lens
dirty 0-3 1 0 = OK. The reported attenuation is below 10%.
1 = Reported window signal value is too low
(Possible sensor fault)
2 = Slight dirt build up (10% signal attenuation or
higher)
3 = High level of dirt build up (The hood could be
blocked)
Emitter
temperature 0-3 1 or 2 0 = Temperature is within operating conditions
1 = Too low. Less than -40°C.
2 = Too high. Over 80°C.
3 = Sensor fault (No sensor detected or below
-54°C) (Severity 2)
Detector lens
dirty 0-3 1 0 = OK. The reported attenuation is below 10%.
1 = Reported window signal value is too low
(Possible sensor fault)
2 = Slight dirt build up (10% signal attenuation or
higher)
3 = High level of dirt build up (The hood could be
blocked)
Detector
temperature 0-3 1 or 2 0 = Temperature is within operating conditions.
1 = Too low. Less than -40°C.
2 = Too high. Over 80°C.
3 = Sensor fault (No sensor detected or below
-54°C) (Severity 2)