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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 turf until the soil moisture reading is around
25-40 centibars at the recommended 3"-5" depth.
Extending Sensor Cables
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.
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 par-
tially, 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, rinse the sensors in water to clean
them, let the sensors dry, then store the sensors in a clean, dry location.
Contacting Davis Instruments
Technical Support, Monday – Friday, 7:00 a.m. – 5:30 p.m. Pacific Time.
(510) 732-7814
Fax to Customer Service or Tech Support.
(510) 670-0589
support@davisnet.com
General e-mail.
info@davisnet.com
Copies of User Manuals, Spec Sheets, and Application Notes are
www.davisnet.com
available on the "Support" page. Watch for FAQs and other updates. Subscribe to the e-
newsletter.
Product Numbers: 6440, 6470
Davis Instruments Part Number: 07395.158C
Soil Moisture Sensor & Multi-Purpose Temperature Probe Installation Instructions
Rev. C Manual (2/25/05)
This product complies with the essential protection requirements of the EC EMC Directve 89/336.
E-mail to Technical Support.
3465 Diablo Avenue, Hayward, CA 94545-2778
510-732-9229 • Fax: 510-732-9188
E-mail: info@davisnet.com • www.davisnet.com
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