DAVIS Soil Moisture Sensor & Temperature Probe Manuale utente

Product # 6440, 6470

SOIL MOISTURE SENSOR &

MULTI-PURPOSE TEMPERATURE

PROBE

INSTALLATION INSTRUCTIONS

FOR USE WITH VANTAGE PRO WIRELESS LEAF & SOIL

MOISTURE/TEMPERATURE STATIONS

The WATERMARK Soil Moisture Sensor and the Multi-Purpose Temperature

Probe are for use with the Vantage Pro Wireless Leaf & Soil Moisture/Tempera-

ture Station, #6343. Please refer to your Wireless Leaf & Soil Moisture/Tempera-

ture Station Installation Manual for complete details on how to install and use

the sensors.

Note: These sensors are also compatible with the Soil Moisture/Temperature Station, #6361.

Connecting the 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

4. Each matched temperature probe and soil moisture pair must use the match-

ing connectors. If a temperature probe is not used, the soil moisture reading

can be off as much as 1% for every 1°F (0.5°C) error in the soil temperature.

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.

Grommets

Sensor Cables Run through Grommets

Connecting Sensor Cables to the

Terminal Block

Page 2 Soil Moisture Sensor & Multi-Purpose Tempera-

5. Secure sensor cables to the cable

tie mounts located next to the

grommets.

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 min-

utes in the morning and let

dry until evening, wet for 30

minutes and let dry over-

night, wet again for 30 min-

utes the next morningand let

dry again until evening. Soak over the next night and install wet. This

will improve sensor response during the first few irrigations or water-

ings.

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 pre-

vent 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.

CAUTION: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 read-

ings.

• The ideal method of making the access hole

is to have a stepped tool. This makes an

oversize hole for the upper portion and an exact sized hole at the bottom

where the sensor is located.

Cable Tie

Mount

When tightening

cable tie, make sure

cables are on top of

cable tie mount.

Securing Sensor Cables

2-1/2" (64 mm)

7/8" (22.5 mm)

Cold rolled steel,

round rod

1-1/4" (32 mm)

approximate

diameter

Overall length

variable

Stepped Sensor

Installation Tool

Page 3

4. After installing the soil moisture sensor, the hole needs to be carefully back-

filled and tamped down to prevent 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.

• Carefully backfill the access hole

with soil to eliminate any air

pockets.

5. You can solvent weld the 1/2” Class

315 PVC tubing to the sensor collar

for easier installation and removal.

• Use a PVC/ABS cement (IPS

Weld-on #794 or equivalent).

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 accu-

racy.

Installation Procedure for Turf/Lawns

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 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.

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 Soil Moisture Station and connect them as described in

“Connecting the Sensors” on page 1.

6. If you withhold 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.

Sensor

Wires

Tape

1/2" PVC Pipe

Pipe welded to

sensor collar with

PVC/ABS cement

Soil Moisture

Sensor

PVC Pipe Welded to Soil Moisture

Sensor Collar

Product Numbers: 6440, 6470

Davis Instruments Part Number: 7395.158

Soil Moisture Sensor & Multi-Purpose Temperature Probe Installation Manual

Rev A Manual (5/22/02)

3465 Diablo Avenue, Hayward, CA 94545-2778 U.S.A.

510-732-9229 • Fax: 510-732-9188

E-mail: [email protected] • www.davisnet.com

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.

Wiring Sensors

The soil moisture sensor and the temperature probe both come with a 15’

(4.6 m) cable.

• If additional wiring is required, up to 1000’ (300 m) of additional wire

can be spliced onto the sensor wire.

• The additional wire must be fully waterproof.

• We recommend using #18 gauge wire with UF insulation, and using a

3M Scotchpak or Duraseal heat shrink splice connector.

Note: Avoid long wire runs near power cables. The transient currents can affect the

small current used to read the sensors.

Contacting Davis Instruments

(510) 732-7814 Technical Support, Monday – Friday, 7:00 a.m. – 5:30 p.m. Pacific

Time.

(510) 670-0589 Fax to Customer Service or Tech Support.

www.davisnet.com Copies of User Manuals, Spec Sheets, and Application

Notes are available on the “Support” page. Watch for FAQs and other updates.

Subscribe to the e-newsletter.

support@davisnet.com E-mail to Technical Support.

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