11
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%
3676i
UV Light Sensor
0
-
200 µmol m
-
2
s
-
1
±5%
6460,
6460
-
20
WaterScout SM 100
Soil Moisture
Sensor
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)
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 us-
er
-
supplied sensor
0
-
2.5V
4
-
20mA
±0.005V
±1%
The WatchDog 3000 Wireless Stations have an external port for
additional sensor input. The following table lists some of the
available optional sensors. See www.specmeters.com for a com-
plete 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.
