Davis DAV-6440 Manual

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Side 1/4

Soil Moisture Sensor & Multi-Purpose Temperature

Probe Installation Instructions

For Wireless Leaf & Soil Moisture/Temperature Stations

The WATERMARK Soil Moisture Sensor and the Multi-Purpose Temperature

Probe are for use with the Vantage Pro2 Wireless Leaf & Soil Moisture/Temperature

Station, #6345. Please refer to your Wireless Leaf & Soil Moisture/Temperature

Station manual for more information on how to install and use the sensors.

Installation Procedures

Connecting the Sensors

• To extend the sensor cables, see “Extending Sensor Cables” on page 4.

• To use a temperature probe for temperature compensation of a soil moisture

sensor, install the sensor pair in corresponding connectors: 1 & 1, 2 & 2, 3 &

3, and 4 & 4.

• If no soil temperature probe is used, the station will use a default temp of

75°F (24°C) to compensate the soil moisture readings.

• If you are installing a temperature probe that is not providing temperature

compensation for a soil moisture reading, do not use a connector that matches

to any installed soil moisture sensor.

• If a soil moister / temperature sensor pair do not use matching connectors, the

soil moisture reading can be off as much as 1% for every 1

° °F (0.5 C) error in

the soil temperature.

1. Run the sensor cables up through the grommets on the bottom of the station

housing.

2. Connect soil moisture probes to the SOIL connectors.

3. Connect the temperature probes to the TEMP connectors.

Cable Clam

Mount

Leaf Wetness

Sensor Cable

Rubber

Grommets

SENSOR

INTERFACE

MODULE

Cable Clamp

Cable Clam

Screw

Temperature Moisture

1 2 3 4 1 2 3 4

Soil Moisture

Sensor Cable

Temperature

Probe Cable

Sensor Cables Enter Station

Housing Through Grommets

Connecting Sensor Cable to

Terminal Block

4. Secure all sensor cables through the provided cable clamps and then secure the

mounts by driving a screw through the clamp into the cable clamp mounts

located above the grommets.

Before “Planting” the Sensors

If you can, soak soil moisture sensors overnight in water before installing them.

• 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 min-

utes 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.

“Planting” the Sensors

1. Make sensor access holes to the depth required with a 7/8” diameter rod.

• Make a hole for the soil moisture sensor and a sepa-

rate 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.

2. 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, you must

use extra caution to install the soil moisture sensor

without damaging the membrane.

• Lack of a snug fit is the biggest problem in obtaining

good soil moisture sensor readings.

• 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.

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 Installa-

tion Tool

Produkt Specifikationer

Mærke:	Davis
Kategori:	Ikke kategoriseret
Model:	DAV-6440

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