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
Note: Increasing the cable length above the recommended maximum cable length may cause inaccurate readings.
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: 800' (243 m) (UF wire recommended)
Mul ti-Purpose Temperature Probe (# 6470)
Sensor Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Precision 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)
Note: There is no absolute maximum cable length. Increasing the cable length above the recommended maximum length causes an increased measurement
error at a rate of approximate. +.024°F (+0.13°C) per 100' (30m) of 22 AWG cable. We recommend the use of 18 AWG fully waterproof with
VG insulation and 3M Scotchpak or Duraseal heat shrink splice connector.
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-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)
Sensor Output
Leaf Wetness
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 15
Dry/Wet Threshold. . . . . . . . . . . . . . . . . . . . . . . . . . User-selectable
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.5
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 to 54 seconds
Soil Moisture (Watermark Soil Moisture Sensor)
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 cb (centibar)
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 200 cb
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 to 90 seconds
Temperature
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . 1°F or 1°C. (user selectable)
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to +150°F (-40° to +65° C)
Sensor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1°F (±0.5°C) typical (See Chart)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 to 90 seconds
Input/Output Specifications:
Black . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Common
White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature (variable resistance to common)
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
Note: Increasing the cable length above the recommended maximum cable length may cause inaccurate readings.
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: 800' (243 m) (UF wire recommended)
Mul ti-Purpose Temperature Probe (# 6470)
Sensor Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Precision 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)
Note: There is no absolute maximum cable length. Increasing the cable length above the recommended maximum length causes an increased measurement
error at a rate of approximate. +.024°F (+0.13°C) per 100' (30m) of 22 AWG cable. We recommend the use of 18 AWG fully waterproof with
VG insulation and 3M Scotchpak or Duraseal heat shrink splice connector.
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-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)
Sensor Output
Leaf Wetness
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 15
Dry/Wet Threshold. . . . . . . . . . . . . . . . . . . . . . . . . . User-selectable
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.5
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 to 54 seconds
Soil Moisture (Watermark Soil Moisture Sensor)
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 cb (centibar)
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 200 cb
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 to 90 seconds
Temperature
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . 1°F or 1°C. (user selectable)
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to +150°F (-40° to +65° C)
Sensor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1°F (±0.5°C) typical (See Chart)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 to 90 seconds
Input/Output Specifications:
Black . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Common
White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature (variable resistance to common)
