Instruction Manual

Installing Leaf Wetness Sensors Page 11
• If you have installed any soil moisture sensors (SOIL 1, SOIL 2, SOIL 3),
the corresponding temperature probes (TEMP 1 for SOIL 1, etc.) will be
used to provide temperature compenstation for the soil moisture sensor
readings.
• If you want to use a temperature sensor for something besides compen-
sation for a soil moisture sensor, then you cannot use the corresponding
soil moisture sensor.
• To use one soil temperature sensor to provide compenstation for multi-
ple soil moisture sensors, install the temperature sensor in TEMP 1.
• If no soil temperature sensors are installed, the station will use the
default temperature of 75ºF (24ºC) to compensate the soil moisture read-
ings. The soil moisture accuracy will be off by about 1 % for each 1ºF
(0.5ºC) difference between the actual soil temperature and 75ºF (24ºC).
Installing Leaf Wetness Sensors
The leaf wetness sensor enables the station to detect the presence of surface
moisture on foliage and calculate the duration of wetness. When moisture is
present, the sensor detects an electrical resistance change between the
gold-plated elements of the grid. This is displayed by the Vantage Pro console
as a value between 0 (dry) and 15 (wet). Using the WeatherLink
®
software, you
may select your own wetness threshold; the software will then calculate leaf-
wet hours.
See the next section, “Installing Soil Moisture & Temperature Sensors” on
page 13 for information on installing temperature sensors.
Connecting Leaf Wetness Sensors
1. Run the sensor cables up through the grommets on the bottom of the station
housing.
2. Insert the sensor cable modular plug into the Leaf 1 or Leaf 2 modular con-
nector.
Grommets
Leaf Wetness Sensor Cables Run
Through Grommets
Connecting Leaf Wetness Sensors