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drops to +76.8°F (24.9°C) or below and thereafter again increases to beyond +77°F
(25°C), the data will be blinking, but no alarm will be activated. It has to drop to below
+75.2°F (24°C) (with a pre-set hysteresis of 1.8°F (1°C)) so that the alarm can be
produced again. Hysteresis values for the various weather data types are given in the
following table:
Weather data Hysteresis
Temperature
1.8°F (1°C)
Humidity 3% RH
Wind speed 3.1 mph
Note:
The temperature or humidity data will keep on flashing even after a key has been
pressed to stop the alarm or buzzer has been switched off, to indicate that the current
weather condition is out of the pre-set limit(s)
WEATHER FORECAST AND WEATHER TENDENCY
WEATHER FORECASTING ICONS:
Weather forecasting icons is displayed in any of the following combinations at the
right bottom part of LCD:
Sunny
TENDENCY
Cloudy with sunny
intervals
TENDENCY
Rainy
TENDENCY
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For every sudden or significant change in the air pressure, the weather icons will
update accordingly to represent the change in weather.
(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 12-
24 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.
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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).
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 in 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 it indicates that the weather is
getting better due to an increase in air pressure. If the bars go down it indicates a
Air pressure
changes in inHg
Air pressure
changes in hPa
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drop of the air pressure and the weather is expected to get worse from the present
time "0".
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
12-24 hours shall be discarded.
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
in Beaufort scale
• Wind chill in °F or °C
• Wind Speed in mph, km/h or m/s
Pointer indicates the
currently detected wind
direction
Text showing wind speed
in Beaufort scale
Wind speed
This alarm symbol
indicates that the alarm
is set On
Wind chill
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RAINFALL MEASUREMENT
The total rainfall measurement is displayed in the fourth section of the LCD, in the unit
of mm or inch. (see VIEWING THE MIN/MAX WEATHER DATA below)
VIEWING THE HISTORY DATA
The Weather Center can store up to 200 sets of weather data which are recorded
automatically at 3-hour intervals after the weather station is powered up, at the
nearest time of 0:00, 03:00, 06:00, 09:00, 12:00, 15:00, 18:00 and 21:00. For
instance, if user has manually set the time as 14:52 after installing batteries, the first
history record will be made at the coming 15:00 automatically. Then the second
record will be on 18:00 and so on.
Each weather record includes the Wind direction, Wind speed in Beaufort scale, Wind
chill temperature, wind speed, Outdoor temperature and humidity, relative pressure
and total rainfall, pressure history and weather tendency. Also, the time and date of
recording will be displayed.
Note:
In order to acquire the correct time of recording of the history records, you shall
manually set the current time as soon as installing batteries to the Weather Center.
Afterwards, you should avoid changing the pre-set time as it will also alter the
recorded "time of recording" of each history record, which may lead to confusion.