22
can set the thresholds for the outdoor temperature to +104°F (+40ºC)
(high) and +14ºF
(-10°C) (low), while only enabling the high alarm and disabling the low
alarm (i.e. temperatures < +14ºF (-10°C) won’t trigger alarm, but
temperatures > +104ºF (+40°C) will).
Alarm setting
Minimum
Maximum
Outdoor Temperature
-40°F (40ºC)
+139.8°F (59.9ºC)
HYSTERESIS
To compensate for fluctuation of the measured data, which may cause
the weather alarm to sound constantly if the measured reading is close
to user set level, a hysteresis function has been implemented for each
weather alarm. For example, if the high temperature alarm is set to
+77°F (+25°C) and the current value moves to +77°F (+25°C), the alarm
will be activated (if it has been enabled). Now when the temperature
drops to +76.8°F (+24.9°C) or below and thereafter again increases to
78°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 2ºF (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 2°F
Humidity 3%
RH
Air pressure
0.03 inHg
WEATHER FORECAST AND WEATHER TENDENCY:
WEATHER FORECASTING ICONS:
There are 4 weather icons in the fourth section of LCD which can be
displayed in any of the following combinations:
