Davis Instruments 6345, 6345CS Data Sheet
Wireless Leaf & Soil Moisture/
Temperature Station
6345
6345CS
Vant ag e Pro2TM Accessories
The Wireless Leaf & Soil Moisture/Temperature Station for
Vantage Pro2
™
monitors up to four temperaturecompensated Soil Moisture Sensors and two Leaf Wetness
Sensors anywhere within the transmission range of your wireless Vantage Pro2 console. The station communicates
directly to your Wireless Vantage Pro2 console/receiver over any one of eight user-selectable ID codes, and has a
transmitting range of between 200' to 1000' (75 to 300 m) depending upon the environment. The station is solar
powered, and includes a battery backup. The soil moi sture , temperature, and Leaf Wetness Sensors are optional and
can be ordered to meet the needs of your application.
The Complete Wireless Soil Moisture/Temperature Station (# 6345CS) comes pre-packaged with four Soil Moisture
Sensors and four temperature probes. The Wireless Leaf & Soil Moisture/Temperature station (# 6345) comes without
any sensors, allowing you to customize the sensors used in correlation with the station.
Soil Moisture Sensors
(# 6420)
The Watermark® Soil Moisture Sensor is an indirect, calibrated method of measuring soil water. It is an electrical
resistance type sensor. The Vantage Pro2 weather station converts the electrical resistance reading from the sensor
into a calibrated reading of centibars of soil water suction. The Mu lti-Purpose Temperature Probe is a precision
thermistor that produces a resistance change proportional to temperature. The temperature probe is used by the station
to provide temperature compensation for the associated soil moisture reading.
The Watermark Soil Moisture Sensor is a product of the Irrometer Company, Inc.
Leaf Wetness Sensors
(# 6440)
The Leaf Wetness Sensor detects the presence of surface moisture. The sensor is an artificial-leaf electrical-resistance
type. It consists of a sensing grid, low-voltage bi-polar excitation circuit, and conductivity-sensing circuit. The
Vantage Pro2 console measures the conductivity across the grid and displays the result as a moisture level, scaled
from 0 to 15. The user may select the threshold level at and above which moisture-hour totals are accumulated.
The sensing grid is a gold-plated etched circuit on an epoxy-glass substrate; the excitation and sense circuits are
encapsulated in black epoxy. The included mounting bracket holds the sensor at a 45
°
angle to simulate a typical leaf
position and to permit runoff of excess moisture; it may be mounted on a vertical post, pipe, or stake.
General
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to +150°F (-40° to +65°C)
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . -50° to +158°F (-45° to +70°C)
Current Draw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.14 mA (average), 30 mA (peak) (from external power source)
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CR123A 3-Volt Lithium cell
Battery Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 months without sunlight - greater than 2 years depending on solar
charging
Solar Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 Watts
Housing Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UV-resistant PVC plastic
Dimensions (length x width x height) . . . . . . . . . . . . . . . . 6.25" x 2.25 " x 7.88" (15 8.75 mm x 57.15 mm x 200 mm)
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.08 lb. (.49 kg) (with battery, without sensors)
Sensors
Leaf Wetness Sensor (# 6420)
Sensor Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical resistance
Cable Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-conductor, 26 AWG
Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Modular connector (RJ-11)
Maximum Cable Length. . . . . . . . . . . . . . . . . . . . . . . . . . 200' (61 m) using 4-conductor 26 AWG cable
DS6345, 6345CS (Rev. C, 1/29/07)
1
2
Vantage Pro2TM Accessories
Watermark Soil Moisture Sensor (# 6440)
Sensor Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical resistance
Standard Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15' (4.6 m) Watermark standard two-wire, stripped and tinned
Maximum Cable Length. . . . . . . . . . . . . . . . . . . . . . . . . . 18 AWG: 1000' (UF wire recommended)
Multi-Purpose Temperature Probe (# 6470)
Sensor Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Thermistor
Standard Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15' (4.6m) 22 AWG direct burial cable, stripped and tinned
Maximum Cable Length. . . . . . . . . . . . . . . . . . . . . . . . . . 24 AWG: 800' (244 m), 22 AWG: 1200' (365 m)
Wireless Communications
Transmit/Receive 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-certi fied, less t han 8 mW , no lice nse
required
Range
Line of Sight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . up to 1000 feet (300 m)
Through Walls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 to 400 feet (75 to 150 m)
Sensor Output
Leaf Wetness
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 15
Dry/Wet Threshold. . . . . . . . . . . . . . . . . . . . . . . . . . User-selectable
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.5
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 to 18 seconds
Soil Moisture (Watermark Soil Moisture Sensor)
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 cb (centibar)
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 200 cb
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.5 to 75 seconds
Temperature
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . 1°F or 1°C. Celsius is converted from Fahrenheit and rounded to the
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to +150°F (-40° to +65° C)
Sensor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1°F (±0.5°C) typical (See Chart)
Sensor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1°F (±0.5°C) up to 110°F (43°C), ±2°F (±1°C) ove r 110°F (43°C)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.5 to 75 seconds
nearest 1°C
(see Fig. 1)
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