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The leaf wetness sensor enables the GroWeather™ to detect the presence of
surface moisture on foliage and calculate the duration of wetness. When mois-
ture is present, the sensor detects an electrical resistance change between the
gold-plated elements of the grid. This is displayed by the GroWeather console
as a value between 0 (dry) and 15 (wet). Using the GroWeatherLink
you may select your own wetness threshold; the software will then calculate
leaf-wet hours.
C
OMPONENTS
The leaf wetness sensor includes the following components. Please make sure
you have all listed components before continuing.
Leaf Wetness Sensor with
attached mounting bracket
The standard version of
the sensor includes an
attached 40' (12 m) cable.
The industrial version
includes a 16' (5 m) cable.
Installation Hardware Kit
One 1-1/2" U-Bolt
Two 1/4" Flat Washers
Two 1/4" Hex Nuts
Two #8 Wood Screws
Two #8 x 3/4"
Machine Screws
Four # 8 Flat Washers
Two # 8 Lock Washers
Two # 8 Hex Nuts
L
W
E A F
E T N E S S
S
& I
T A N D A R D
I
N S T A L L A T I O N
S
N D U S T R I A L
M
A N U A L
Product # 7846 & 7848
E N S O R
®
software,
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Related Manuals for Davis Instruments Leaf Wetness Sensor
Summary of Contents for Davis Instruments Leaf Wetness Sensor
- Page 1 The leaf wetness sensor enables the GroWeather™ to detect the presence of surface moisture on foliage and calculate the duration of wetness. When mois- ture is present, the sensor detects an electrical resistance change between the gold-plated elements of the grid. This is displayed by the GroWeather console as a value between 0 (dry) and 15 (wet).
- Page 2 2. Press the appropriate key(s) to make sure you are getting a leaf wetness reading on the console. Consult the GroWeather manual for instructions on displaying leaf wetness. 3. Drop or spray water onto the sensor and make sure the reading changes. Page 2 EEDED Leaf Wetness Sensor...
- Page 3 NSTALLING THE ENSOR Follow the instructions in this section to install your sensor. Before you begin, consult the System Installation manual for instructions on labeling the leaf wet- ness sensor cable. Typical Standard Installation The illustration below shows typical standard leaf wetness installation. The sensor cable attaches to connector S3 on the sensor interface module (SIM).
- Page 4 Typical Industrial Installation The illustration below shows typical industrial leaf wetness installation. The sensor cable attaches to connector S3 on the sensor interface module (SIM). Page 4 YPICAL NDUSTRIAL NSTALLATION Leaf Wetness Sensor...
- Page 5 If your SMA includes holes for the leaf wetness sensor, you may skip this step. 2. Attach the leaf wetness sensor to the SMA using the #8 x 3/4" machine screws, # 8 flat washers, # 8 lock washers, and # 8 hex nuts as shown below.
- Page 6 1" and 1-1/4" (25 mm and 31 mm), secure the sensor to the pipe using the 1-1/ 2" U-bolts, 1/4" flat washers, and 1/4" hex nuts as shown below. Use a 7/16" wrench or adjustable wrench to tighten the hex nuts. Page 6 OUNTING ON A OODEN URFACE OUNTING ON A Leaf Wetness Sensor...
- Page 7 ECHNICAL UPPORT Before calling Technical Support (1-510-732-7814), carefully check all cable con- nections from the sensor to the console. Cable connections account for a large portion of the potential problems. Connections should be firmly seated in the jacks and plugged in straight. If you think a connection may be faulty, try jig- gling the cable while looking at the display.
- Page 8 Product Numbers: 7846 & 7848 Davis Instruments Part Number: 7395-110 Leaf Wetness Sensor, Standard and Industrial Rev. D Manual (7/7/99) This product complies with the essential protection requirements of the EC EMC Directive 89/336/EC. © Davis Instruments Corp. 1996. All rights reserved.
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