B) Trend Displays; C) Air Pressure Progress Display; Dew Point; Heat Index - Conrad W232 Bedienungsanleitung

b) Trend displays

Behind the displays for inside/outside temperature, inside/outside air humidity and air pressure you find arrow
symbols which indicate the trend of the measuring values.
Rising
Unchanging/stable
Decreasing

c) Air pressure progress display

The bar graph (25) in the left lower part of the display shows the air pressure progress of the last 6 hours. At a glance
you thusly recognise a big change of the air pressure which can indicate a high or a low pressure area.
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Of course, during start-up of the weather station there are no measuring data of the last 6 hours yet and
all bars of the display are at the same height.
d) Dew point
The dew point is a temperature point which depends on the concurrrence of a certain air pressure, a certain
temperature and a certain air humidity.
At this temperature point the condensation of the air humidity starts, the so-called dew, the air humidity condenses
out and precipitates as liquid (fog, damp).
If the dew point for steam is below 0°C, the condensation appears as snow or rime.
e) Heat index
The heat index describes the felt temperature on the basis of the measured air temperature as well as the relative
air humidity. Apart from the temperature, the air humidity too has effects on the human organism and the thermal
sensation affected by it.
At a high air humidity the temperature of e.g. +35°C is felt as "hotter" than at a lower air humidity.
The reason is that at high temperatures and high air humidity the heat regulation of the human body through sweating
(e.g. tropical areas) is impaired. Whereas, at a high temperature and low air humidity (in a desert, for example) a
heat regulation through sweating is very well possible.

Thus, at average air humidity the heat index indicates approx. the same temperature as the display of
the inside or outside temperature.
At a high temperature and simultaneous high air humidity the heat index shows a higher value
(example: outside temperature 27°C, air humidity 70%: heat index approx. 29.5°C, temperature is felt
hotter by the human body than it actually is).
At a high temperature and simultaneous low air humidity the heat index shows a lower value.
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