Campbell Met One 034A-L Manuel de l'opérateur télécharger pdf (Page 27)

Manual

Sensors

While orienting the cross arm and Nu-rail using a compass, please note that there is a difference between geo-

graphic and magnetic north. Figure 9 presents the current declination angle for the Lake Victoria region.

Figure 9: Declination Angle in the Lake Victoria Region

3.2.3 Operation

Operation of the Met One 034A-L Wind Set is fully automatic and does not require any user intervention. The appro-

priate instructions for this purpose are included in the datalogger program METSTAT. The reader is referred to

paragraph 2.2 and Annex 3 in case of need of more information on METSTAT.

3.2.4 Maintenance

The Met One O34A-L Windset requires the following maintenance:

• DuringeachvisittotheMetStation,visuallyinspecttheanemometeratlowwindspeeds;verifythatthecup

assembly and wind vane rotate freely; check if all connections are tight; check if the rotating elements do not gener-

ate unusual sounds; remove all foreign material (spider webs, etc.) from both anemometer and vane;

• Eachtwoyears,replacetheanemometerbearings(contactCampbellScientific);

• Eachtwoyears,replacethewindvanepotentiometerandbearings(contactCampbellScientific).

3.2.5 Trouble Shooting

Problem 1: Both wind speed and wind direction values are zero.

Remedy 1.1: Check if all wires are properly connected, both to the Met One 034A-L and to the CR10X wiring panel.

The reader is referred to table 1 in paragraph 2.2, and Annex 2, for the correct wiring of the 034A-L to the CR10X.

Remedy 1.2: Re-load METSTAT following the instructions given in paragraph 2.5.

Problem 2: Unusual and/or unexpected recordings for either wind speed or direction.

Remedy 2: Re-load METSTAT following the instructions given in paragraph 2.5.

true north

3 degrees, 0 minutes west

needle points to

magnetic north

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 74 75

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Campbell Met One 034A-L Manuel de l'opérateur Page 27