User manual

80 Capricorn 2000EX Weather Station
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Columbia Weather Systems, Inc.
Pyranometer
It measures the combined intensity of incoming direct solar radiation and
diffused sky radiation. The Pyranometer consists of a radiation-sensing
element, which is mounted so that it views the entire sky.
Relative Humidity
Popularly called humidity. The ratio of the actual vapor pressure of the
air to the saturation vapor pressure.
Sea Level Pressure
The atmospheric pressure at mean sea level, either directly measured
or, most commonly, empirically determined from the observed station
pressure.
In regions where the earth’s surface pressure is above sea level, it is
standard observational practice to reduce the observed surface pressure
to the value that would exist at a point at sea level directly below.
Soil Moisture
Moisture in the soil within the zone of aeration present in the soil pores.
In some cases this refers strictly to moisture within the root zone of
plants.
Solar Radiation
The total electromagnetic radiation emitted by the sun. 99% of the suns
energy output falls within the wavelength interval from 0.15 microns to
4.0 microns, with peak intensity near 0.47 microns. About one-half of the
total energy in the solar beam is contained within the visible spectrum
from 0.4 to 0.7 microns, and most of the other half lies near infrared, a
small additional portion lying in the ultraviolet.
Wind Chill
That part of the total cooling of a body caused by air motion.