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TFA Opus 35.1112 IT Manual

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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.
AIR PRESSURE HISTORY (ELECTRONIC BAROMETER WITH BAROMETRIC
PRESSURE TREND)
The LCD also shows the relative air pressure value and the air pressure history.
Press the SET key to toggle between Mode1 and Mode2 of the display.
• Mode 1: the bar graph displays the air pressure history of the past 24 hours in
seven steps. The horizontal axis represents the last 24 hours of air pressure
recording (-24, -18, -12, -9, -6, -3 and 0 hour).
• Mode 2: the bar graph displays the air pressure history of the past 72 hours in
seven steps. The horizontal axis represents the last 72 hours of air pressure
recording (-72, -48, -36, -24, -12, -6 and 0 hour).
The vertical bars are plotted at each of the nine steps and give the trend over the
recorded period. The 0 hour vertical bar will always display at the midline height to
indicate the current air pressure. The varying height of bars inn other columns on the
graph indicate a relative change in air pressure up or down from the previous
measurement.
New pressure measurements are compared to previously recorded pressure
measurements. The pressure change is expressed by the difference between the
current ("0h") and the past readings in divisions of ±0.06 inHg or ±2 hPa. If the bars are
rising from left to right, this indicates that the weather is getting better due to an
increase in air pressure. If the bars are falling from left to right, this indicates that the
weather is expected to get worse due to a drop in air pressure.
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.
… 27 …


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