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Notes to Dewpoint and Windchill:
Air can at a certain temperature only carry a certain amount of water
(water vapor), which also increases and decreases with temperature. If
the air temperature decreases below the so called dewpoint (saturation
point), the excessive water vapor will condense and fall out in form of
dew, fog or rain. At a temperature of e.g. 15°C and a relative humidity of
50% the dewpoint will be about 5°C, at 80% humidity about 12°C. At a
relative humidity of 100% saturation is reached, i.e. the dewpoint is
15°C. At a dewpoint below freezing the fallout will become frost or snow.
Windchill has been introduced for battle planning during World War II. It
represents not the real measured but the one temperature a person
feels in open area under the influence of wind and cold. Windchill is laid
out in tables for various temperatures and wind speeds. At an outdoor
temperature of e.g. 8°C and calm winds a person moving at a speed of
6 m/s will already feel a windchill temperature of 0°C.
Wind Data (LCD Section 4)
The current wind direction will be displayed on the LCD compass on the
wind section. Press the WIND key to toggle between wind direction as
numerical (e.g. 225°) and abbreviated characters (e.g. SW) as well as
numerical wind speed display inside the compass circle.
12.
Operation keys
The base station has 8 keys for easy operation. Please refer to the
following table for use and function of each key: Further descriptions of
the key functions with regard to their immediate range of application can
be found in the Programming modes:
SET - key
- In normal mode to enter the manual basic
programming mode
- In basic programming mode to select the
following setting modes:
- LCD contrast setting
- Manual time setting (hours/minutes)
- 12/24 time format display
- Calendar setting (year/month/date)
- Time zone setting
- °C/°F temperature setting
- Wind speed unit setting
- Rainfall unit setting
