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returned through evaporation (from wet vegetation surfaces and the stoma of
leaves) with the amount of water vapor returned through transpiration (exhal-
ing of moisture through plant skin) to arrive at a total. Effectively, ET is the
opposite of rainfall, and it is expressed in the same units of measure (Inches,
millimeters).
The Weather Envoy uses air temperature, relative humidity, average wind
speed, and solar radiation data to estimate ET. (ET is calculated once an hour
on the hour.)
Please note that calculating ET requires the optional solar radiation sensor.
Leaf Wetness
Note: Leaf Wetness is only available with the wireless Weather Envoy using the optional
Leaf and Soil Moisture/Temperature station (#6345) with a Leaf Wetness sensor
(#6420).
Leaf wetness provides an indication of whether the surface of foliage in the
area of the sensor is wet or dry by indicating how wet the surface of the sensor
is. The leaf wetness reading ranges from 0 (dry) to 15.
Soil Moisture
Note: Soil Moisture is only available with the wireless Weather Envoy using the optional
Leaf and Soil Moisture/Temperature station (#6345) with a Soil Moisture sensor
(#6440).
Soil Moisture, as the name suggests, is a measure of the moisture content of
the soil. Soil moisture is measured on a scale of 0 to 200 centibars, and can
help choose times to water crops. The soil moisture sensor measures the vac-
uum created in the soil by the lack of moisture. A high soil moisture reading
indicates dryer soil; a lower soil moisture reading means wetter soil.
Time
The Weather Envoy has a clock and a calendar for tracking time and date. The
calendar automatically adjusts during leap years and daylight savings, provid-
ing you have entered the correct year, latitude and longitude, and daylight sav-
ings settings in the Setup Mode.
Specifications
General
Operating Temperature. . . . . . . . . . . .+14° to +140°F (-10° to +60°C)
Non-operating Temperature . . . . . . . .-13° to +158°F (-25° to +70°C)
Current Draw, Wireless . . . . . . . . . . .0.90 mA average, 20 mA peak, (plus 0.125
mA for each optional wireless transmitter in
use) at 4 to 6 VDC
Current Draw, Cabled . . . . . . . . . . . .10 mA average, 15 mA peak at 4 to 6 VDC
AC Power Adapter . . . . . . . . . . . . . . .5 VDC, 200 mA, regulated