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(Every time a new average pressure value has been obtained (once per minute), this value is
compared with an internal reference value. If the difference between these values is bigger than
the selected weather tendency sensitivity, the weather-icon changes, either for worse or for
better. In this case, the current pressure value becomes the new weather tendency reference.)
If the icons do not change, either the air pressure has not changed or the change has been too
small for the Weather Center to register. So you may adjust the "sensitivity" of the pressure
change checking in the setting mode –see WEATHER TENDENCY SENSITIVITY VALUE
SETTING above.
However, if the icon displayed is a sun or raining cloud, there will be no change of icon if the
weather gets any better (with sunny icon) or worse (with rainy icon) since the icons are already at
their extremes.
The icons displayed forecasts the weather in terms of getting better or worse and not necessarily
sunny or rainy as each icon indicates. For example, if the current weather is cloudy and the rainy
icon is displayed, it does not mean that the product is faulty because it is not raining. It simply
means that the air pressure has dropped and the weather is expected to get worse but not
necessarily rainy.
Note:
After setting up, readings for weather forecasts should be disregarded for the next 48-60 hours.
This will allow sufficient time for the Weather station to collect air pressure data at a constant
altitude and therefore result in a more accurate forecast.
Common to weather forecasting, absolute accuracy cannot be guaranteed. The weather
forecasting feature is estimated to have an accuracy level of about 75% due to the varying areas
the Weather Center has been designed for use. In areas that experience sudden changes in
weather (for example from sunny to rain), the Weather Center will be more accurate compared to
use in areas where the weather is stagnant most of the time (for example mostly sunny).
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If the Weather Center is moved to another location significantly higher or lower than its initial
standing point (for example from the ground floor to the upper floors of a house), discard the
weather forecast for the next 48-60 hours, as the Weather Center may mistake the new location
as being a possible change in air-pressure when really it is due to the slight change of altitude.
WEATHER TENDENCY INDICATOR
Working together with the weather icons is the weather tendency indicators (arrow located on the
left and right sides of the weather icons). When the indicator points upwards, it means that the
air-pressure is increasing and the weather is expected to improve, but when indicator points
downwards, the air-pressure is dropping and the weather is expected to become worse.
Taking this into account, one can see how the weather has changed and is expected to change.
For example, if the indicator is pointing downwards together with cloud and sun icons, then the
last noticeable change in the weather was when it was sunny (the sun icon only). Therefore, the
next change in the weather will be cloud with rain icons since the indicator is pointing downwards.
Note:
Once the weather tendency indicator has registered a change in air pressure, it will remain
permanently visualized on the LCD.
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AIR PRESSURE HISTORY (ELECTRONIC BAROMETER WITH BAROMETRIC
PRESSURE TREND)
The bottom section of the LCD also shows the relative air pressure value and the air pressure
history.
Depending on programming conditions, display of the history of air pressure is in the form of a
graph consisting of vertical bars.
The bar graph of the electronic barometer shows the air pressure history of the past 12 hours in
five 3-hour steps.
The horizontal axis represents the last 12 hours air pressure recording (-12, -9, -6, -3 and 0 hour).
The bars are plotted at each of the 5 steps and give the trend over the recorded period. The
scale on the right compares the result. The "0" in the middle of this scale determines the current
air pressure.
The vertical axis represents the air pressure changes in inHg (+0.12, +0.06, 0, -0.06, -0.12. The
“0” represents the current air pressure). The newly measured pressure was compared to the
previously recorded pressure reading. The pressure change is expressed by the difference
between the current ("0h") and the past readings in division of ±2 hPa or ±0.06 inHg. If the bars
are rising, this indicates that the weather is getting better due to an increase in air pressure. If the
bars go down it indicates a drop of the air pressure and the weather is expected to get worse
from the present time "0".
A
ir pressure
changes in inHg
Air pressure
changes in hPa
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At every full hour, the current air pressure is used as a basis for the display of a new graph bar.
The existing graph is then moved one column to the left.
Note:
For accurate barometric pressure trend, the Weather Center should operate at the same altitude.
For example, it should not be moved. Should the unit be moved, for instance from the ground to
the second floor of the house, the readings for the next 48-60 hours shall be discarded.
Note: The bar graph will scroll right to left regularly to prevent LCD burnout.
WIND DIRECTION AND WIND SPEED MEASUREMENT
In normal display mode, the second section of the LCD shows the following wind data.
Wind direction (shown on the a compass scale of 16 divisions) and wind speed/ gust in
Beaufort scale
Wind chill in F or C
Wind Speed in km/h, mph or m/s
Gust in km/h, mph or m/s (displayed when in Mode 2, by pressing the SET key shortly)
9

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