Calculated Industries 6250 Guide de dépannage télécharger pdf (Page 50)

Barometric Pressure

The weight of the air that makes up our atmosphere exerts a pressure on the surface of the

earth known as atmospheric pressure. Generally, the more air above an area, the higher the

atmospheric pressure. This means that atmospheric pressure changes with altitude. For

example, atmospheric pressure is greater at sea level than on a mountaintop. To compensate

for this difference and facilitate comparison between locations with different altitudes,

atmospheric pressure is adjusted to the equivalent sea level pressure. This adjusted pressure is

known as barometric pressure. In reality, Vantage Vue measures atmospheric pressure. When

you enter your location’s altitude in Setup Mode, Vantage Vue stores the necessary offset

value to consistently translate atmospheric pressure into barometric pressure.

Barometric pressure also changes with local weather conditions, making barometric pressure

an extremely important and useful weather forecasting tool. High pressure zones are generally

associated with fair weather while low pressure zones are generally associated with stormy

weather. For forecasting purposes, however, the value of the absolute barometric pressure is

generally less important than the change in barometric pressure. In general, rising pressure

indicates improving weather conditions while falling pressure indicates deteriorating weather

conditions.

Evapotranspiration (ET)

Evapotranspiration (ET) is a measurement of the amount of water vapor returned to the air in a

given area. It combines the amount of water vapor returned through evaporation (from wet

surfaces) with the amount of water vapor returned through transpiration (exhaling of moisture

through plant stomata) to arrive at a total. Effectively, ET is the opposite of rainfall, and it is

expressed in the same units of measure (inches, millimeters).

Vantage Vue uses air temperature, relative humidity, barometric pressure, average wind speed,

and solar radiation data to estimate ET, which is calculated once an hour on the hour.

Measuring ET requires that the Vantage Vue console “listen” to a an optional Vantage Pro2

Plus station with a solar radiation sensor installed.

Solar Radiation

What we call “current solar radiation” is technically known as Global Solar Radiation, a

measure of the intensity of the sun’s radiation reaching a horizontal surface. This irradiance

includes both the direct component from the sun and the reflected component from the rest of

the sky. The solar radiation reading gives a measure of the amount of solar radiation hitting the

solar radiation sensor at any given time, expressed in Watts/sq. meter (W/m

). Measuring solar

radiation requires that the Vantage Vue console “listen” to an optional Vantage Pro2 Plus

station with a solar radiation sensor installed. Solar Radiation is displayed in the Weather

Center when ET is pressed and WxCEN is pressed multiple times.

UV (Ultra Violet) Radiation

Energy from the sun reaches the earth as visible, infrared, and ultraviolet (UV) rays. Exposure

to UV rays can cause numerous health problems, such as sunburn, skin cancer, skin aging, cat-

aracts, and immune system suppression. Measuring UV radiation requires that the Vantage

Vue console “listen” to an optional Vantage Pro2 Plus station with a UV radiation sensor

installed. The UV Index is displayed in the Weather Center when ET is pressed and WxCEN is

pressed multiple times.

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Calculated Industries 6250 Guide de dépannage Page 50

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