Campbell-scientific CS125 Present Weather Sensor Manual de usuario descargar pdf (Pagina 28)

CS125 Present Weather Sensor

Message ID break down

Definition

Basic format. Contains only distance and system information

Partial format. Contains user alarm outputs

Full format. Contains all system alarms codes

Basic SYNOP present weather format

Partial SYNOP present weather format

Full SYNOP present weather format

Basic METAR present weather format

Partial METAR present weather format

Full METAR present weather format

Sensor ID break down

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

No fault

Possible degraded performance

Degraded performance

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

Definition

0-32,000 metres

Current visibility distance being detected by the sensor

Visibility units break down

Definition

Metres

Feet

Averaging duration break down (see note below)

Definition

One minute average

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.

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Campbell-scientific CS125 Present Weather Sensor Manual de usuario Pagina 28

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