6
External Sensors
Item #
Description
Measurement
Range
Accuracy
3665R
Tipping Bucket
Rain collector
N/A ±2%
3666
Leaf Wetness
Sensor
0(Dry) - 15(Wet) N/A
3667,
3667-20
External (Soil)
Temperature Sensor
-40 to 185ºF
-40 to 85ºC
±1.1°F
±0.6°C
3670i Silicon Pyranometer 1-1250 W/m
2
±5%
3668i,
3668i3,
3668i6
Quantum Light
Sensor and Sensor
Bars
0-2500 µmol m
-2
s
-1
±5%
3669
Soil Moisture
Transducer
0-100 kPa ±2%
6450WD
6450WD20
Watermark Soil
Moisture Sensor
0 - 200 cbars N/A
6451 Irrigation Sensor Switches at 5 psi ±1 psi
3673
3674
Input Cables for
user-supplied sensor
0-2.5V
4-20mA
±0.005V
±1%
3676i UV Light Sensor 0-200 µmol m
-2
s
-1
±5%
6460,
6460-20
WaterScout SM 100
Soil Moisture Sen-
sor
0% to saturation
(typically 50%)
±3%
6470, 6470-
20
WaterScout SMEC
300 Soil Moisture/
EC/Temperature
Sensor
VWC: 0% to sat.
EC: 0 to 10 mS/cm,
Temp: 0 to 122 °F
(-18 to 50 °C)
VWC” ±3%
EC: ±2%
Temp: ±1.4
°F (0.8 °C)
All WatchDog 2000 Mini Station models have external channels (ports)
for additional sensor input. The following table lists some of the
available optional sensors. See www.specmeters.com for a complete
list. Most sensors include a 6-foot cable with pin-type connector.
Items 3667-20, 6460-20, 6470-20 and 6450WD20 have 20 foot cables.
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