Campbell Scientific CS125 Present Weather Sensor - Manual (Page 28)

CS125 Present Weather Sensor
20
Message ID break down
Id
Definition
0 Basic format. Contains only distance and system information
1 Partial format. Contains user alarm outputs
2 Full format. Contains all system alarms codes
3 Basic SYNOP present weather format
4 Partial SYNOP present weather format
5 Full SYNOP present weather format
6 Basic METAR present weather format
7 Partial METAR present weather format
8 Full METAR present weather format
Sensor ID break down
ID
Definition
0-9 Unit number defined by the user to aid identification of data. Zero by default.
Useful for RS485 networks. Operates as an address in RS485 mode
System status break down (1)
Status level Definition
0 No fault
1 Possible degraded performance
2 Degraded performance
3 Maintenance required
(1) System status break down reflects the highest level of severity of any active alarm.
Message interval
Time
Definition
1-3600 The amount of time, in seconds, between outputs in continuous mode
Visibility distance break down
ID Definition
0-32,000 metres Current visibility distance being detected by the sensor
Visibility units break down
ID Definition
M Metres
F Feet
Averaging duration break down (see note below)
ID Definition
1 One minute average
10 Ten minute average
Note: In accordance with WMO requirements the CS125 produces visibility 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.