Vaisala WMS302 Guía de usuario descargar pdf (Pagina 53)

Chapter 3 _________________________________________________________ Selecting Location

VAISALA_______________________________________________________________________ 51

Air Temperature and Relative Humidity Sensor

Finding a suitable site for the Air Temperature and Relative Humidity

Sensor is important for getting representative ambient measurements.

The site should represent the general area of interest.

The recommended height for the sensor is from 1.5 to 2 meters (from 5

to 6.5 ft.) from ground or the height defined with the applicable mast

construction. Install the sensor so that direct sunlight to the sensor is

avoided.

Avoid the following installation sites to ensure correct measurements:

shaded areas, rooftops, steep slopes, heat sources, swamps, high

vegetation, and places that might hold water after rains.

Rain Gauges

The opening 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 opening.

In areas of homogeneous dense vegetation, the height of the vegetation

should be kept below the gauge opening 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 splashing.

Pyranometers

Finding a suitable site for the solar radiation sensor is important for

getting representative ambient measurements. The site should represent

the general area of interest.

Make sure that no building or object will shadow the solar radiation

sensor, during the day.

On the Northern Hemisphere, the solar radiation sensor should be

installed on the southern side of the mast (on the Southern Hemisphere,

NOTE

The radiation shield is important in protecting the sensor from direct

sunlight and must always be used.

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Vaisala WMS302 Guía de usuario Pagina 53