18 Orion 420 Weather Station
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Heating (Optional)
Heating elements located below the precipitation sensor and inside the wind transducers k eeps the
precipitation and wind sensors free from snow and ice. A heating temperature sensor (T
h
) underneath the
precipitation sensor controls the heating.
Three fixed temperature limits, namely +3 °C, -2 °C, and -4 °C (+37 °F, +38 °F, +25 °F) control the
heating power as follows:
T
h
> +3 °C heating is off
-2 °C < T
h
< +3 °C 50% heating power
-4 °C < T
h
< -2 °C 100% heating power
T
h
< -4 °C 50% heating power
The Orion 420 Weatherproof Enclosure contains the following:
1. AC power supply with +24 VDC output
2. AC power filter and suppressor
3. Two RS-232 to 4-20 mA converters
4. Sensor connection terminal block