Vaisala MAWS201 User's Guide download pdf (Page 52)

User's Guide _______________________________________________________________________

50 ___________________________________________________________________ M210243en-A

rooftops, steep slopes, heat sources, swamps, high vegetation and

places that might hold water after rains.

Precipitation

Rain gauge QMR101 is installed on the same sensor arm with the

temperature and humidity probe. Rain gauge QMR102 is installed on

the ground, on a base plate, or on a separate stand near the logger.

The orifice of the gauge must be in a horizontal plane, open to the sky,

and above the level of in-splashing and snow accumulation. In

general, objects should not be closer to the gauge than a distance twice

their height above the gauge orifice.

In areas of homogeneous dense vegetation, the height of the

vegetation should be kept below the gauge orifice level by regular

clipping. Sites on a slope or on the roof of a building should be

avoided. Also hard flat surfaces such as concrete should be avoided to

prevent excessive in splashing.

Solar Radiation

Make sure that no building or object will shadow the station,

especially the solar panel and solar radiation sensors, during the day.

On the Northern Hemisphere, the solar radiation sensors should be

installed on the southern side of the MAWS (on the Southern

Hemisphere, vice versa) to avoid other weather station structures

shading the sensor. To facilitate leveling/cleaning, installing at a

height of 3 m or less is recommended.

The solar panel should face south (true south, not magnetic) on the

Northern Hemisphere and north on the Southern Hemisphere.

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Vaisala MAWS201 User's Guide Page 52