22
Orion 420 Weather Station
________________________________________________________________________
Columbia Weather Systems, Inc.
Heating (Optional)
Heating elements located below the precipitation sensor and inside the
wind transducers keeps the precipitation and wind sensors free from
snow and ice. A heating temperature sensor (T
h
) underneath the
precipitation sensor controls the heating.
Note that (T
h
) is measured inside the transmitter, where temperature is
much higher than the ambient temperature (T
a
).
Three fixed temperature limits, 4 °C, 0 °C, and -4 °C (+39 °F,
+32 °F, +25 °F) control the heating power as follows:
•
When ambient temperature (T
a
) falls below +4°C, heating is
enabled.
•
Heating keeps T
h
> +4 °C until T
a
< -1 °C
•
Heating keeps T
h
> 0 °C until T
a
< -15 °C
