Campbell Met One 034A-L Manuel de l'opérateur télécharger pdf (Page 24)

Installation, Operation and Maintainance of Automatic Meteorological Stations

Sensors

3.1.2 Installation

The rainfall recordings should be representative for the surrounding area. Towards this end, the user is advised to

observe the following guidelines when selecting the rain gauge location:

• SelectasitefortheMetStationthatitisrepresentativeforthearea.Windspeedatgaugelevelshouldbe

uniform, and preferably as small as possible;

• Removeallobstaclesinthevicinityofthegaugethatcouldcreatewindeffects,asthesemayinfluencethe

rain catch; the distance of the gauge to obstructing objects should be at least 4 times the height of the obstruction;

• Noobjectsshouldinterceptprecipitationthatshouldreachthegauge;

• Theareasurroundingthegaugeshouldberelativelylevel,andthegageorificeshouldbehorizontal;thelip

of the funnel should be at 50 cm above the ground.

• The ground surrounding the gage should be covered with short grass, equivalent natural vegetation, or

gravel to avoid splashing of rainfall into the gage; the ground surface around the gage should not be paved.

The TE525 Rain Gauge mounts to a 2-inch pipe. Drive the pipe into the ground to acquire a firm vertical post, and

use the enclosed hose clamps to mount the gauge to this post. The lip of the funnel should be 50 cm above ground

level and at least 5 cm above the post. Level the gauge after mounting it.

Note: before final leveling, press one of the buckets down against its stop to make sure that the buckets are NOT

hung up in the center.

The TE525 includes a 25 feet electrical cable. To protect this cable from accidental cutting, it should be placed in a

1-inch underground PVC tube from rain gauge to tripod. Next, lead the cable through the opening in bottom of the

ENC12/14 protective enclosure to the datalogger. Tie up carefully any excess cable, and do not cut it off, as it may

be useful in other occasions. Connect the stripped black wire to terminal P2 of the wiring panel, and the stripped

clear wire to terminal G next to P2. See table 1 in paragraph 2.2, and Annex 2 for the detailed wiring schedule of the

CR10X data logger.

3.1.3 Operation

Operation of the TE525 Tipping Bucket Rain Gauge is fully automatic and does not require any user intervention. The

appropriate instruction for this purpose is 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 this subject.

3.1.4 Maintenance

Maintenance is limited to the following. At every visit to the Met station:

• CheckiftheTE525issecurelyattachedtothepost,andthatthepostisfirmlyimplantedintheground;

• CheckifthecablefromTE525totripodiscompletelyunderground;

• Checkifallexcesscableiscarefullytiedup,andthatthewiresaresoundlyconnectedtothewiringpanel.If

necessary clean contacts;

• Checkifthe funneland bucketmechanism are clean; removeany leaves, dust,insects, or otherforeign

material.

Perform a field calibration check every 12 months, as follows:

• Secureametalorplasticcanthatcanholdatleastoneliterofwater;

• Punchaverysmallholeinthebottomofthecan;

• Placethecanontopofthefunneloftheraingage,andpour0.5literofwaterintothecan;

• Theholeistoolargeifittakeslessthan40minutestoemptythecan;

• Thisshouldresultin91tips,plusorminusthree;

• Ifnecessarycorrectthetippingmechanism.Adjustingscrewsarelocatedonthebottomnexttothelarge

center drain hole. One half-turn of both screws causes 2% to 3% change. Adjust both screws the same number of

turns. A rotation clockwise increases the number of tips per 0.5 liter, while a rotation counter-clockwise decreases

the number of tips.

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Campbell Met One 034A-L Manuel de l'opérateur Page 24

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