Troubleshooting guide

EvapoTranspiration (ET)

Note: Requires optional solar radiation sensor (#6450, included on Vantage Pro2 or Van-

tage Pro2 Plus weather stations).

EvapoTranspiration (ET) is a measurement of the amount of water vapor

returned to the air in a given area. It combines the amount of water vapor

returned through evaporation (from wet vegetation surfaces and the

stoma of leaves) with the amount of water vapor returned through

transpiration (exhaling 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 which is calculated once

per hour on the hour.

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 vacuum 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 for daylight saving time in most of

North America and Europe (and allows manual adjustment elsewhere)

and for leap years providing you have entered the correct year, latitude

and longitude, and daylight savings settings in the Setup Mode.