Davis Instruments Wireless Leaf & Soil Moisture/Temperature Station, 6345, 6345OV Installation Manual
Wireless Leaf & Soil Moisture/Temperature Station
Installation Manual
For Wireless Vantage Pro2
™
and Vantage Pro2 Plus
™
The Wireless Leaf & Soil Moisture/Temperature Station (referred to in this document
as the Leaf/Soil Station) can be used with any Wireless Vantage Pro2 weather station
to measure leaf wetness, soil moisture, or temperature.
The following Vantag e Pro2 console station configurations can be used with the
Leaf/Soil Station:
Station Type in
Console
Configuration
LEAF/SOIL Station 2 4 4
LEAF Station 2 - 2
SOIL Station - 4 4
Number of Leaf
Wetness Sensors
Number of Soil
Moisture Sensors
Number of
Temp Probes
• Only one Leaf/Soil Station can be installed as a Leaf/Soil Station per Vantage Pro2
Weather Station.
• Two stations can be installed if one is configured as a Leaf Station and the other
station is configured as a Soil Station in the Vantage Pro2 console.
• Configured as a Leaf Station, the Station supports two leaf wetness sensors and
two temperature probes.
• Configured as a Soil Station, it supports up to four soil moisture sensors and temperature probes.
Note: In any station using soil moisture sensors, the correspo nding temperatu re probe, if in stalled , will be
used for temperature compensation of the soil moisture sensor.
Tools for Setup
In addition to the components shown, you will need some or all of the following
materials:
• Adjustable wrench or 7/16" wrench
• Medium Phillips Screwdriver
• Ballpoint pen or paper clip (small pointed object of some kind)
• Drill and 3/16" (5 mm) drill bit (if mounting on a vertical surface)
• Stepped Sensor Installation Tool for Soil Moisture and Temperature Sensors (recommended, see page 16)
1
Components
The Leaf/Soil Station includes the following components and hardware:
Shelter
U-Bolts
1/4" Flat Washers
1/4" Lock Washers
1/4" Hex Nuts
8" Cable Ties
Leaf/Soil Station Components
Optional Sensors
The following optional sensors are available for the Leaf/Soil Station:
#8 x 3/4"
Machine
#8 Flat Washers
#8 Hex Nuts
Leaf Wetness Sensor
with 40' (12.2 m) of cable
Optional Leaf Wetness Sensor (#6420)
U-Bolts
1/4" Flat
Washers
1/4" Hex Nuts
#8 Lock Washers
#8 Wood Screws
1/4" x 1-1/2"
Lag Screws
3-Volt Lithium
Battery
Screws
Optional Soil Moisture Sensor (#6440) and Optional Temperature Sensor (#6470)
2
Soil Moisture Sensor
with 15' (4.6 m) of cable
Temperature Probe
with 15' (4.6 m) of cable
Installation Steps
For ease of installation and use of your Leaf/Soil Station, please follow steps in the
order presented.
• Preparing the station, page 3
• Setting the transmitter ID, page 5
• Choosing a location to mount the station, page 8
• Mounting the station, page 9
• Rules for using the sensors, page 10
• Installing leaf wetness sensors, page 11
• Installing soil moisture and temperature sensors, page 13
• Using soil moisture readings, page 17
If you encounter difficulties or have questions about your station, the following
additional information may be helpful:
• Troubleshooting the sensors, page 18
• Extending Sensor Cables, page 18
• Contacting Davis Technical Support, page 19
• Specifications, page 19
• FCC W arning, page 20
Preparing the Leaf/Soil Station
The following illustrations show the location of the transmitter ID DIP switches, the
battery mounting location, the modular connectors used by the leaf wetness sensors,
and the terminal blocks used to connect the soil moisture sensors and temperature
probes.
3
Installing the Battery
es
p
SENSOR
INTERFACE
MODULE
p
1. Insert the 3-volt lithium
battery into the battery
holder, matching the “+”
sign on the battery with
the “+” sign next to the
battery mounting
brackets.
2. Note the location of the
DIP switches. You will
work with them during
the next installation step.
Rubber
Grommets
3-Volt
Lithium Battery
-
+
SENSOR
INTERFACE
MODULE
Temperature Moisture
1 2 3 4 1 2 3 4
DIP Switch
Test LED
Cable Clam
Screw
Cable Clamp
Cable Clam
Mount
Temperature
Probe Cable
Leaf Wetness
Sensor Cable
Soil Moisture
Sensor Cable
Temporarily Connecting a Sensor for Testing
Temporarily connect at least one of the following sensors.
Note: You must have at least one sensor installed in the Leaf/Soil station in order to test wireless com-
munications.
Leaf Wetness Sensor Connection
• Connect the leaf wetness sensor cable to the LEAF
1 or LEAF 2 receptacle by plugging it in the proper
receptacle.
Soil Moisture Sensor Connection
T emporarily connect a soil moisture probe to the SOIL
1 terminal block connector using the following instructions.
1. Use a pen or small screwdriver to open the
connector “jaws” as shown in the illustration at the
top of the next page.
2. While the jaws are open, insert the temperature probe leads, then let the connec-
Connecting a Leaf Wetness
Sensor
tor jaws close in on the lead by removing the pen or small screwdriver.
Note: The soil moisture sensor must be moist to be used for this test. A completely dry sensor will not
register on the console.
4
Soil Temperature Sensor Connection
Temporarily connect a temperature probe to the
TEMP 1 terminal block connector.
1. Use a pen or smal l screwdriver to open the
connector “jaws” as shown in the illustration to
the right.
2. While the jaws are open, insert the temperature
probe leads, then let the connector jaws close in
on the lead by removing the pen or small screwdriver.
Connecting a Soil Moisture or
Temperature Sensor
Setting the Transmitter ID
Each wireless transmitting station must be set to one of eight transmitter IDs. DIP
switches #1, 2 and 3 on the Sensor Interface Module (SIM) allow you to control the
ID — the “channel” the station will transmit on. (DIP switch #4 is used for transmission testing, not for transmitter ID.)
Note: A transmitter and receiver communicate with each other only when both are set to the same ID.
The factory default transmitter ID is ‘1’. Looking at the table below, you can see
that means the DIP switches are in the OFF position when each transmitting station
leaves the factory . This is true for all Davis wireless equipment.
1. Verify the transmitter ID used by your ISS, as well as all other transmitter IDs
already used by your Vantage Pro2 Weather Station.
2. Configure the Leaf/Soil Station to a transmitter ID not already in use.
3. Use a ballpoint pen or paper clip to toggle DIP switches #1, 2, and 3. The settings
for transmitter IDs 1 – 8 are shown in the table below:
#1
#2 OFF OFF ON
#3 OFF ON OFF
#4 OFF ON ON
#5 ON OFF OFF
#6 ON OFF ON
#7 ON ON OFF
#8 ON ON ON
ID Code Switch 1 Switch 2 Switch 3
(default) OFF OFF OFF
5
.
Battery Holder
ON
1234
DIP Switches
Transmitter DIP Switches in Top-right Corner of SIM
Setting Console/Receiver(s) to Same ID
1. Put your console into Setup Mode — press and hold DONE and press the down
arrow (-).
• The console displays the words: “RECEIVING FROM...” and “STATION
NO.” followed by the transmitter IDs that your console detects. One of these
should be the ID number you just set on the Leaf/Soil Station transmitter. It
can take up to two minutes to show all transmitter IDs received.
• If you don’t see the station on the console screen, make sure the console is
within 10' of the transmitter, and verify that you set the DIP switches correctly. Wait a few seconds and if you still don’t see it, go to “Troubleshooting
Communication Problems” on the next page.
2. Press DONE to move to “Screen 2: Selecting Transmitters.”
• Setup Mode – Screen 2 is where you will set the console to recognize signals
on that ID as coming from a Leaf/Soil Station.
3. Press the left (<) or right (>) arrows to scroll through transmitter IDs.
• When you see the ID you chose for the Leaf/Soil Station, press the up (+) or
down (-) arrows to activate reception of that ID code. Make sure the screen
shows “ON (ISS)”.
4. Press GRAPH several times to change the station type in the console from ON
(ISS) to ON (LEAF), ON (SOIL), or ON (LEAF/SOIL).
• Configure it as a LEAF Station if you are only using it for leaf wetness and
temperature.
• Configure it as a SOIL station if you are only using it for soil moisture and
temperature.
• Configure it as a LEAF/SOIL station if you are using it for both leaf wetness
and soil moisture.
5. To exit Setup Mode, press and hold DONE.
Note: See the Vantage Pro2 User’s Manual & Setup Guide: “Setup Mode – Screen 2: Selecting Trans-
6
mitters” for more information.
Testing Station Communications
1. If you are usin g a Soil Moisture sen so r to test th e station , press TEMP until you
see “SOIL MOIST” displayed on the console screen where the inside
temperature is usually displayed. If you are using a Leaf Wetness sensor, press
HUM until you see “LEAF WET” displayed where you usually see the inside
humidity. Both TEMP and HUM will display temperatures if you are using a
temperature probe to test the station.
• Soil temperature is displayed in the TEMP OUT location on the LCD. Leaf
temperature is displayed below the barometer reading on the LCD.
• If you see SOIL MOIST or LEAF WET and no number, you are seeing the
moisture and temperature readings for sensor pair #1. A two, three or four
will appear above the readings for the second, third or fourth set of sensors.
2. If you continue to press TEMP or HUM, you will see the readings for sensor
pairs #2, #3 and #4 (#3 and #4 are displayed for soil moisture and temperature
only).
• If no sensor is installed, the reading for that sensor will be dashed out.
3. A soil moisture, temperature, or leaf wetness reading confirms communication
between your Leaf/Soil Station and the console.
• Disconnect the sensor(s) that were temporarily installed to test communica-
tions.
• Go on to “Choosing a Location to Mount the Station” on page 8.
If your console does not show a sensor reading, proceed to “Troubleshooting Communication Problems.”
Troubleshooting Communication Problems
First, verify that the console/receiver is powered and is not in Setup Mode (exit
Setup Mode by pressing DONE and holding it for a moment). Then, on the Leaf/
Soil Station, check that the battery is properly installed. Walk around the room with
the console, standing for a few moments in various locations to see if you are picking up signals.
If you don’t see any readings, no matter where you stand with the console, put the
transmitter in TEST mode as described below.
TEST mode
DIP switch #4 on the SIM (see illustration on page 6) is the TEST DIP switch.
Switch it to the ON position using a ball-point pen or paper clip. This puts the transmitter in Test Mode. The test LED will flash each time the transmitter broadcasts a
signal, which should be about every 2.5 seconds.
If the LED flashes only once and then remains dark, or does not flash at all, there is
a problem with the transmitter. See “Contacting Davis Technical Support” on
page 19.
7
If the LED flashes repeatedly but your console isn’t picking up a signal anywhere in
the room, it could be related to one of the following causes:
• The DIP switches were not correctly set on the transmitter. Review the procedure
on page 5.
• The ID was not correctly set on the console/receiver. Review the procedure on
page 6.
• Reception is being disrupted by RF (radio frequency) interference.
• There is a problem with the console/receiver. See “Contacting Davis Technical
Support” on page 19.
Note: Remember to turn DIP switch #4 OFF when you’re finished testing wireless transmission. If it is
left ON, the blinking LED will reduce battery life significantly.
Choosing a Location to Mount the Station
Try to position your Leaf/Soil Station as follows:
• With the solar panel positioned for maximum exposure to the sun.
• Within transmission range of your Vantage Pro2 console.See “Range of Wireless
Transmission” on page 8.
• Within cable range of the sensors:
• Leaf Wetness Sensors come with 40’ (12 m) of cable standard and can be
extended up to 200’ (61m) using 6-conductor 26 AWG cable.
• Soil Moisture Sensors come with 15’ (4.6 m) of cable standard and can be
extended up to 1000’ (300m) using #18 gauge UF cable.
• Temperature Sensors come with 15’ (4.6 m) of cable standard and can be
extended up to 800’ (242m) using #24 AWG shielded cable or up to 1200’
(260m) using #22 AWG shielded cable.
Range of Wireless Transmission
The range of wireless transmission depends on many factors. For the best reception,
position the transmitter shelter and your console/receiver as close together as possible.
The maximum range is up to 1,000' (300 m) in the line of sight, under optimal conditions. Typical range under most conditions is 200' to 400' (75 to 150 m), but this
may be reduced by walls, ceilings, trees, or foliage. Radio-frequ e ncy interference
(RF) can also reduce transmission distance. Cordless phones and baby monitors are
common examples of devices that can cause RF interference.
A metal roof or other large metal structure can interfere with the signal. Aluminum
siding, a furnace with metal ducts, and your refrigerator are examples. Sometimes
transmission between wireless units is obscured by something you cannot identify,
or by some obstacle that you can’t work around. If necessary, consider using Wireless Repeater #7626 or #7627 to strengthen the signal or increase the distance
between the transmitter and the console/receiver.
8
Testing Transmission from Proposed Location
It is very important to test reception from the proposed location before permanently
mounting the Leaf/Soil Station.
• Place the shelter at the intended mounting site, or have someone hold it there, so
you can walk around with the console/receiver for a few minutes. Rotating the
antenna so that the transmitting and receiving antennas are parallel to each other
may help to improve reception.
• Test wireless reception anywhere you might want to use or mount your console
and receiver now or in the future. Take your time. If you aren’t picking up strong
signals where you intend to place your console, move the shelter before it is
mounted.
• If you have irregular terrain in the area, it may interfere with the signal. For
example, if the transmitter is mounted downhill from the console/receiver, the
ground may block a wide angle of the transmitted signal.
Mounting the Leaf/Soil Station
Mounting on a Vertical Surface
1. With a 3/16" (5 mm) drill bit, drill two
holes approximately 2" (50 mm)
apart. Use a carpenter’s level to
Flat
Washer
Lag
Screw
ensure the holes will be level.
2. Drill two more holes 7-1/32" below
the upper holes.
3. Insert the 1/4" x 1-1/2" lag screws
through the flat washers, and through
the holes at the top and bottom of the
shelter into the post.
Mounting Station on a Vertical Surf ace
4. Using an adjustable wrench or 7/16"
wrench, tighten the lag screws.
Mounting on a Pole
1. While holding the
shelter against the pole,
place a U-bolt around
the pole and through the
two holes on at the top
of the shelter.
U-Bolt
Mounting Station on a Pole
Flat
Washer
Lock
Washer
Hex
Nut
9
2. Place a flat washer, a lock washer and a hex nut on each of the bolt ends.
3. Using an adjustable wrench or 7/16" wrench, tighten the nuts.
4. Place the second U-bolt around the pole and through the two holes at the bottom
of the shelter.
5. Put a flat washer, a lock washer, and a hex nut on each bolt end, and tighten the
hex nuts.
Note: If no soil temperature probe is used, the console will use a default temperature of 75ºF (24ºC) to
compensate the soil moisture sensor readings.
6. To prevent fraying or cutting of cables, secure
them so they will not whip about in the wind.
Secure a cable to a metal pole by wrapping electrical tape around them both. Make sure cables
are secure by placing clips or ties approximately
every 3 – 5' (1 – 1.6 m).
Cable Clip
Securing Cables with Clips and Ties
Note: Do not use metal staples or a staple gun to secure cables. Metal staples — especially when
installed with a staple gun — have a tendency to cut the cables.
Cable Tie
Rules for Using Leaf, Soil and Temperature Sensors
The following station and sensor configurations are supported by the Leaf/Soil Station:
Station Type in
Console
Configuration
LEAF/SOIL Station 2 4 4
LEAF Station 2 - 2
SOIL Station - 4 4
Number of Leaf
Wetness
Sensors
Number of Soil
Moisture
Sensors
Number of
Temperature
Probes
• A station configured as a LEAF station in the console will support two leaf wetness sensors and two leaf temperature probes.
• Leaf temperature probes can be used as you wish to measure air, water, or soil
temperature. Leaf temperature does not affect leaf wetness readings.
• A station configured as a SOIL station in the console will support four soil moisture sensors and four soil temperature probes.
• If you have installed any soil moisture sensors (SOIL 1, SOIL 2, SOIL 3, SOIL
4), the corresponding temperature probes (TEMP 1 for SOIL 1, etc.) will be used
to provide temperature compensation for the soil moisture sensor readings.
• If you want to use a temperature sensor for something besides compensation for a
soil moisture sensor, then you cannot use the corresponding soil moisture sensor.
10
• To use one soil temperature sensor to provide compensation for multiple soil
moisture sensors, install the temperature sensor in TEMP 1.
• If the station is configured as a combined LEAF/SOIL station, the value displayed for Leaf Temperature #1 will be same value displayed for Soil Temperature #1. The same is true for Leaf and Soil Temperature #2.
• If no soil temperature sensors are installed, the station will use the default temperature of 75ºF (24ºC) to compensate the soil moisture readings. 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 Pro2 console as a value between 0 (dry)
and 15 (wet). Using the WeatherLink
®
software with the Agricultural/Turf Management Module, 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 connector.
Grommets
Leaf Wetness Sensor Cables Run Through
Grommets
Connecting Leaf Wetness Sensors
11
Finishing the Sensor Connections to the Station
p
SENSOR
INTERFACE
MODULE
p
1. Secure sensor cables within the cable
clamps located next to the grommets.
2. Secure the cable clamps using the by
screwing them to the cable clamp
Temperature Moisture
1 2 3 4 1 2 3 4
mounts inside the housing near the
grommets.
Rubber
Grommets
SENSOR
INTERFACE
MODULE
Cable Clam
Screw
Cable Clamp
Cable Clam
Mount
Temperature
Probe Cable
Leaf Wetness
Sensor Cable
Soil Moisture
Sensor Cable
Securing Sensor Cables
3. To prevent fraying or cutting of
cables, secure them so they will not whip about in
the wind. Secure a cable to a metal pole by wrapping electrical tape around them both. Make sure
cables are secure by placing clips or ties approximately every 3 – 5' (1 – 1.6 m).
Cable Clip
Securing Cables with Clips and Ties
Note: Do not use metal staples or a staple gun to secure cables. Metal staples — especially when
installed with a staple gun — have a tendency to cut the cables.
Cable Tie
Mounting the Sensor Against a Wooden Surface
To mount the sensor against a
wooden surface, secure the sensor to
the surface using the #8 wood
screws as shown below.
12
Mounting on a Wooden Surface
Mounting the Sensor on a Pipe
To mount the sensor on a pipe, stake, or
pole with outside diameter between
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.
Mounting on a Pipe
Installing Soil Moisture & Temperature Sensors
The soil acts as a reservoir to store water between irrigation or rainfall events, so
that it is available to the crop or plants as needed for healthy growth. The purpose of
using sensors to measure the soil water is to give you a better understanding of how
fast water is being depleted in the different areas of your field or lawn, so you can
better schedule your irrigations and correctly evaluate the true effectiveness of any
rainfall. By monitoring the soil moisture between irrigations, you will gain a more
accurate picture of this process over time, and develop an irrigation scheduling pattern to meet your crop’s “need” for water. This minimizes the guesswork, resulting
in water savings, lower pumping costs, and the elimination of excess leaching of
nitrogen due to over irrigation.
While not absolutely necessary for operation, we recommend that a temperature
probe be installed with each soil moisture sensor. This allows the soil moisture sensor’s readings to be temperature compensated for better accuracy.
Note: WATERMARK Soil Moisture Sensor information based on material supplied by Irrometer Com-
pany, Inc.
Connecting Soil Moisture and Temperature Sensors
1. Run the sensor cables up through the grommets on the bottom of the station
housing.
2. Connect the temperature probes to the TEMP connectors.
3. Connect soil moisture probes to the SOIL connectors
Each matched temperature probe and soil moisture pair must use the matching con-
nectors. If a temperature probe is not used, the soil moisture reading can be off as
much as 1% for every 1
and the default value. If no soil temperature probe is used for a particular soil moisture sensor, the soil temperature #1 value is used if present. Otherwise, the console
°F (0.5°C) difference between the actual soil temperature
13
will use a default temperature of 75° F (24° C) to compensate the soil moisture
p
Sensor Cable
SENSOR
INTERFACE
MODULE
Test LED
p
readings.
SENSOR
INTERFACE
MODULE
Temperature Moisture
1 2 3 4 1 2 3 4
Cable Clam
Screw
Cable Clamp
Cable Clam
Mount
Rubber
Grommets
Temperature
Probe Cable
Leaf Wetness
Soil Moisture
Sensor Cable
Running Soil Moisture and Temperature Sensor
Connecting Soil Moisture and Temperature Sensors
Finishing the Sensor Connections to the Station
1. Secure sensor cables within the cable clamps located next to the grommets. See
the above illustration.
2. Secure the cable clamps using the by screwing
them to the cable clamp mounts inside the housing near the grommets.
3. To prevent fraying or cutting of cables, secure
them so they will not whip about in the wind.
Secure a cable to a metal pole by wrapping electrical tape around them both. Make sure cables
are secure by placing clips or ties approximately
Cable Clip
Securing Cables with Clips and Ties
Cable Tie
every 3 – 5' (1 – 1.6 m).
Note: Do not use metal staples or a staple gun to secure cables. Metal staples — especially when
installed with a staple gun — have a tendency to cut the cables.
Locating Sensors
Be aware of the soil variations in your field or lawn. The lighter soils dry very
quickly, heavier soils more slowly. Both conditions must be considered.
Furrow or Flood Irrigation
• Sensors are usually placed about 2/3 of the way down the run, just ahead of the
tail or backup water. This is the area where water penetration is usually the poorest.
• In tree crops, place the sensors on the drier side of the tree exposed to the most
sun. In the Northern Hemisphere, this is typically the Southwest side of the tree,
which is exposed to the hot afternoon sun.
14
Sprinkler Irrigation
• Sprinkler irrigation usually provides a more uniform distribution of water to the
ground surface, but there can be great differences in penetration and holding
capacity due to soil type variations, soil interfaces and contour . Try to place your
sensors in the areas where variations occur.
• In tree crops, locate sensors at the drip line.
• In row crops, locate sensors right in the plant row.
• Be sure that sensors are not located behind obstructions, such as tree limbs,
which would interfere with water distribution to the sensor area.
• With center pivots, place sensors at 3 locations down the length of the pivot, just
in front of the "start" point.
• Place sensors at "hot spots" or "good production" areas being sure to stay in
active root zones.
Drip or Micro Irrigation
• Place sensors in the wetted area. With drip emitters, this is usually 12” to 18”
from the emitter.
• With micro-sprinklers or sprays, usually 24” to 36” from the micro-sprinkler is
best.
Sensor Depths
Sensor depth depends on the rooting depth of your crop, and also depends on soil
depth and texture.
Some crops need
measurement at
more than one depth
Sensor depth
dependent on:
• crop rooting
depth
• soil texture
and depth
Sensors must be located in the effective root system of the crop
Co-locate
temperature probes
and
moisture sensors
• With shallow rooted (less than 12”) vegetable crops, one depth may be adequate.
• Deeper rooted row crops, small grains, vines, and trees need to be measured in at
least two depths.
• With deep well-drained soils, crops generally root deeper if moisture is available.
• With coarse, shallow or layered soils, root systems may be limited in depth.
15
• Guidelines on proper depths for specific crops and conditions can be obtained
from your local farm advisor. Irrometer also maintains an excellent resource listing the suggested placement for soil moisture sensors by crop at www.irrometer.com.
Installation Procedure
1. Soak the soil moisture sensors overnight in water.
• Always “plant” a wet soil moisture sensor.
• If time permits, wet the soil moisture sensor for 30 minutes in the morning and let
dry until evening, wet for 30 minutes and let dry overnight, wet again for 30 minutes the next morning and let dry again until evening. Soak over the next night
and install wet. This will improve sensor response during the first few irrigations
or waterings.
2. Make sensor access holes to the depth required with a 7/8” diameter rod.
• Make a hole for the soil moisture sensor and a separate adjacent hole for the temperature probe.
• For very coarse or gravely soils, an oversize hole of 1” to 1 1/4” may be needed
to prevent abrasion damage to the soil moisture sensor membrane. In this case,
you will need to “grout in” the sensor with a slurry made from the sample soil to
get a snug fit in the soil.
3. Always install sensors in the active root system of the crop with a snug fit in the
soil.
Note: In gravelly soils and with deeper sensors, carefully install the sensor to prevent damaging the
membrane.
• Lack of a snug fit is the biggest problem in obtaining
good soil moisture sensor readings.
• The ideal way of making the access hole is to use a
stepped installation tool. The stepped tool makes an
oversize hole for the upper portion and an exact sized
hole at the bottom where the sensor is located.
• The illustration to the right shows the dimensions
required to make a stepped installation tool.
4. After installing the soil moisture sensor the hole
needs to be carefully backfilled and tamped down.
This prevents the creation of air pockets which could
allow water to channel down to the sensor.
• Fill the hole with water and push the sensor down
into the hole so it bottoms out.
• A length of 1/2” Class 315 PVC tubing fits snugly
over the sensor collar and can be used to push the
sensor. A good snug fit in the soil is important.
16
Cold rolled steel,
round rod
1-1/4" (32 mm)
approximate
diameter
Overall length
variable
2-1/2" (64 mm)
7/8" (22.5 mm)
Home-Made Stepped Sensor
Installation Tool
• Carefully backfill the access hole with soil to eliminate any air pockets.
5. You can solvent weld the 1/2” Class 315 PVC
Tape
tubing to the sensor collar for easier installation
and removal.
• Use a PVC/ABS cement (IPS Weld-on #794 or
equivalent).
Sensor
Wires
6. After you have installed the soil moisture sensors, the sensors will need one or two irrigation
cycles to “break-in” and acclimate to the soil
conditions and provide better accuracy.
Installation Procedure for Turf/Lawns
1/2" PVC Pipe
1. Cut a slight “V” shaped trench about 5” wide at
the top and about 6” deep into the turf--about 6”
long.
2. Lift out the turf plug piece you just cut.
3. Press the sensors into the soil at about a 45
Pipe welded to
sensor collar with
PVC/ABS cement
Soil Moisture
Sensor
degree angle into the side of the trench to set the
sensors about 3”-5” below the soil surface. Make
sure they are good and snug in the soil.
PVC Pipe Welded to Soil Moisture Sen-
sor Collar
4. Set the plug removed from the trench and compact it back into place. It will
repair itself in short order.
5. Run the wires to the Leaf/Soil Station and connect them as described in “Connecting Soil Moisture and Temperature Sensors” on page 13.
6. If you wit hhold irrigation for several days and allow the soil to dry down a bit,
you should see the soil moisture readings start to creep upward.
7. Usually, you will not need to water the turf until the reading is in the 25-40 area
at the recommended 3”-5” depth.
Removing the Sensors
1. When removing sensors prior to harvest in annual crops, it’s a good idea to do
this just after the last irrigation when the soil is moist.
2. Do not pull the sensor out by the wires. You may have to dig out, at least partially, any sensors more than 12” deep or any sensors in dry soil. Careful removal
prevents sensor and sensor membrane damage.
3. When sensors are removed for winter storage, clean the sensors, dry them, and
place them in a clean, dry location.
Using Soil Moisture Readings
Use this table as a general guide to interpret soil moisture readings. Monitoring the
soil moisture readings, and comparing them to your field or lawn conditions over
time, will help you develop a better understanding of how to interpret your soil
moisture readings.
17
Centibar Reading Soil Condition
0-10 Saturated Soil. Occurs for a day or two after irrigation.
10-20 Soil is adequately wet (except coarse sands which are dry-
ing out at this range)
30-60 Usual range to irrigate or water (except heavy clay soils).
Irrigate at the upper end of this range in cool humid climates
and with higher water-holding capacity soils.
60-100 Usual range to irrigate heavy clay soils
100-200 Soil is becoming dangerously dry for maximum production.
Proceed with caution.
Troubleshooting the Sensors
If you are having problems with your station, please check all sensor cable connections. Cable connections account for a large portion of potential problems.
Use these tests to verify the correct operation of your soil moisture sensor:
1. With the sensor submerged in water, the station should show a reading between 0
and 5.
2. Let the sen s or air dry for 30 to 48 hours. Dep e nding on ambient temperature,
humidity, and air movement, the reading should be 150 or over.
3. Put the sensor back in the water. The reading should run right back to 0 to 5
within 1 to 2 minutes.
4. If the sensor does not pass these tests, please contact Davis Technical Support for
help in resolving the problem.
Extending Sensor Cable Length
Both the soil moisture sensors and the temperature probes come with 15’ (4.6 m)
direct burial cables. The leaf wetness sensor comes with a 40’ (12m) cable.
• Leaf W etness Sensor cables can be extended up to 200’ (61m) using 6-conductor
26 AWG cable.
• Soil Moisture Sensor cables can be extended up to 1000’ (300m) using #18
gauge waterproof cable. UF insulation is recommended.
• Temperature Sensors can be extended up to 800’ (242m) using #24 AWG
shielded cable or up to 1200’ (260m) using #22 AWG shielded cable.
• The additional wire must be fully waterproof.
• We recommend using a 3M Scotchpak or Duraseal heat shrink splice connector
when extending the sensor cables.
Note: Avoid long wire runs near power cables. The transient currents can affect the small current used
to read the sensors.
18
Contacting Davis Technical Support
If you have questions about your Leaf/Soil Station, or encounter problems installing
or operating the station, please contact Davis Technical Support.
Note: Please do not return items to the factory for repair without prior authorization.
(510) 732-7814 – Monday – Friday, 7:00 a.m. – 5:30 p.m. Pacific Time.
support@davisnet.com – E-mail to Technical Support.
(510) 732-9229 – For callers outside the USA or Canada.
(510) 670-0589 – Fax.
www.davisnet.com – Copies of User Manuals are available on the “Support” page.
Watch for FAQs and other updates. Subscribe to the e-newsletter.
info@davisnet.com – General e-mail.
Specifications
General
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . -40° to +150° F (-40° to +65°C)
Non-operating Temperature . . . . . . . . . . . . . . . . . . . -50° to +158°F (-45° to +70°C)
Current Draw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.14 mA (average), 30 mA
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CR12 3A 3-Volt L ithium cell
Battery Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 month s witho ut sunlight -
Solar Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 Watts
Housing Material . . . . . . . . . . . . . . . . . . . . . . . . . . . UV -resistan t PVC pla stic
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.25 " x 2.25" x 7.875 "
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.08 lb. (.49 kg) (with battery,
Leaf Wetness Sensor (6420)
Sensor Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrica l resistance
Cable Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-conduc tor, 26 AWG
Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Modula r connector (RJ-11)
Maximum Cable Length . . . . . . . . . . . . . . . . . . . . . . 200’ (61 m) usin g 4-cond uctor
Watermark Soil Moisture Sensor (6440)
Sensor Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrica l resistance
Standard Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15’ (4.6 m) Watermark standard
Maximum Cable Length . . . . . . . . . . . . . . . . . . . . . . 18 AW G: 1000’ (UF wire
Multi-Purpose Temperature Probe (6470)
Sensor Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The rmistor
Standard Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15’ (4.6m) 22 AWG direct burial
(peak) at 4 to 6 VDC power
greater than 2 years depending
on solar charging
(158.75 mm x 57.15 mm x
200 mm)
without sensors)
26 AWG cable
two-wire, stripped and tinned
recommended)
19
E
cable, stripped and tinned
Maximum Cable Length . . . . . . . . . . . . . . . . . . . . . . 24 AWG: 800’ (244 m), 22 AWG:
1200’ (365 m)
Wireless Communications
Transmit Frequency . . . . . . . . . . . . . . . . . . . . . . . . US Models: 902-928 MHz
FHSS, Overseas Models:
868.0 - 868.6 MHz FHSS.
ID Codes Available . . . . . . . . . . . . . . . . . . . . . . . . . 8
Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 902-928 MHz FHSS: FCC-
certified low power, less than 8
mW, no license required
868.0 - 868.6 MHz FHSS.
CE-certified, less than 8 mW, no
license required
Range
Line of Sight . . . . . . . . . . . . . . . . . . . . . . . . . . . up to 1000 feet (300 m)
Through Walls. . . . . . . . . . . . . . . . . . . . . . . . . . 200 to 400 feet (75 to 150 m )
FCC Part 15 Class B Registration Warning
This equipment has been tested and found to comply with the limits for a class B digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not occur in a particular
installation.
If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by
one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
Changes or modifications not expressly approved in writing by Davis Instruments may void the user's
authority to operate this equipment.
Product Numbers: 6345, 6345OV
Davis Instruments Part Number: 07395.267
Wireless Soil Moisture, Leaf Wetness, Temperature Station 2 Installation Manual
Rev. B Manual (3/1/05)
This product complies with the essential protection requirements of the EC EMC Directve 89/336.
3465 Diablo Avenue, Hayward, CA 94545-2778
510-732-9229 • Fax: 510-732-9188
-mail: info@davisnet.com • www.davisnet.com
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