Spectrum Technologies WatchDog User manual

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Leaf Wetness Sensor
PRODUCT MANUAL
Item # 3666
®

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Thank you for purchasing a Leaf Wetness Sensor to
use with your WatchDog Data Logger or Weather Sta-
tion. This manual will aid you in placement and
mounting of the Leaf Wetness Sensor. Read it thor-
oughly to ensure proper and effective use of the sensor.
The Leaf Wetness Sensor includes a cable which con-
nects to an external port on a Model 200 or higher data
logger or weather station.
Once the sensor is positioned in a representative
"micro-climate,” connect the data cable by plugging
into a WatchDog external channel to log leaf wetness
data.
Gold Plated Sensor Grid: The sensor reads wetness
by measuring the resistance on the grid. The resistance
measurement is converted to a Leaf Wetness value
from 0-15, in whole numbers. Any value over 6 is con-
sidered ‘wet’. Accurate measurements require this sur-
face be kept clean of all conductive matter (leaves,
grass, dirt, and salts). Periodically wipe the sensor with
distilled water to remove dust, pesticide residue, irriga-
tion water salts, etc.
Use SpecWare Software to program the WatchDog to
log leaf wetness. Refer to the SpecWare Users Guide
for detailed launch and/or readout instructions. Leaf
Wetness Hours can be calculated through “reports” in
the SpecWare Software.
Thank You

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Positioning the Sensor
Locate the sensor in a typical “micro-climate” away
from the edge of an orchard , vineyard, or field.
Attach the sensor on a 1” to 1 1/4” mast (pipe) using
the u-bolt with the sensor pointing to the north.
Place in an area of the plant canopy with is appropriate
for the disease being noticed. For example to simulate
the impact of rain only, the leaf wetness sensor would
be positioned under the canopy. For full impact of
both rain and dew the sensor would be positioned
closer to the top of the plant canopy. Contact your co-
operative extension office for further suggestions.
Inspect the sensor frequently to make certain the sensor
has not fallen from their mounts or that leaves or debris
are not stuck to the senor surface.
Place leaf wetness sensor in a position
that will mimic plant conditions while
being within reach of external Watch-
Dog data port.
WatchDog Data Logger in-
side radiation shield.

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Warr a nty
This product is warranted to be free from defects in material or work-
manship for one year from the date of purchase. During the warranty
period Spectrum will, at its option, either repair or replace products that
prove to be defective. This warranty does not cover damage due to
improper installation or use, lightning, negligence, accident, or unau-
thorized modifications, or to incidental or consequential damages be-
yond the Spectrum product. Before returning a failed unit, you must
obtain a Returned Materials Authorization (RMA) from Spec-
trum. Spectrum is not responsible for any package that is returned
without a valid RMA number or for the loss of the package by any ship-
ping company.
3600 Thayer Court
Aurora, IL 60504
[phone] or [phone]
Fax [phone]
E-Mail: [email protected]
www.specmeters.com Rev. 8/13