RST IQ552, Instruction Manual

Page: 19 / 24

The tendency indicators arrow is located beside the air pressure value to show the air pres-
sure tendency and provide a forecast of the weather to be expected by the decreasing or
increasing air pressure. The upward arrow means that the air pressure is increasing and the
weather is expected to become better. The downward arrow means that the air pressure is
decreasing and the weather is expected to become worse. The tendency indicator arrow will
not show up while the pressure without change within 30minutes. The base unit measure the air pressure per
10minutes. If the air pressure continuous increasing 3 times the arrow will be upward, if the air pressure continu-
ous decreasing 3 times the arrow will be downward, otherwise the tendency arrow will not show up.
The pressure threshold can be set to suit the user’s requirement for weather forecasting from
2-4 hPa (default 2 hPa). There is pressure sensitivity icon on the top left corner of LCD to indica-
te the pressure threshold by number of dots. For areas that experience frequent changes in air
pressure requires a higher setting compared to an area where the air pressure is stagnant. For
example if 4hPa is selected, then there must be a fall or rise in air pressure of at least 4hPa befo-
re the weather station will register this as a change in weather.
RST02552 19
Pressure tendency indicator
Pressure sensitivity setting for weather forecasting