Operation Manual

70
Weather Data (LCD Section 2)
Indoor temperature and humidity are displayed simultaneously
in this section. Use the DISPLAY key to toggle through the
displays for other weather information:
- Outdoor temperature/humidity
- Outdoor wind chill
- Outdoor dew point
- Rainfall 24h
- Rainfall 1h
- Rainfall total.
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 dew-
point 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 tem-
perature a person feels in open area under the influence of
wind and cold. Windchill is laid out in tables for various tem-
peratures 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 3)
The current wind direction will be displayed on the LCD com-
pass on the wind section. Press the WIND key to toggle be-
tween wind direction as numerical (e.g. 225°) and abbreviated
characters (e.g. SW) as well as numerical wind speed display
inside the compass circle.