Davis DAV-6420 Bruksanvisning
Davis
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DAV-6420
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465 Diabl o Ave., Ha
y
ward, CA 94545-277
8
3465 Diablo Ave., Hayward, CA 94545-2778 USA
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DS6420 (Rev. F, 11/11/11)
1
Vantage Pro2TM Accessories
6420
Leaf Wetness Sensor
For the Wireless Leaf & Soil Moisture/Temperature Station (# 6345)
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, or on the Sensor Mounting Arm.
General
Sensor Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Artificial leaf electrical resistance
Excitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bipolar (3V nominal) built-in
Time Constant. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 seconds
Attached Cable Length . . . . . . . . . . . . . . . . . . . . . . . . . . 40' (12 m),
Maximum Recommended Cable Extension . . . . . . . . . . . 200' (61 m) using 4-conductor 26 AWG cable
Note: Increasing the cable length above the recommended maximum cable length causes measurement error in the form of lower leaf wetness readings.
Cable Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-conductor, 26 AWG
Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Modular connector (RJ-11)
Material
Substrate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Glass-reinforced, ceramic-filled laminate
Grid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 oz. copper, nickel, and 50 µ inch gold plate
Mounting Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . White powder-coated aluminum
Dimensions (length x width x height)
Leaf Wetness Sensor. . . . . . . . . . . . . . . . . . . . . . . . 4.00" x 2.25" x 2.25" (102 mm x 58 mm x 58 mm)
Sensor Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4 in
2 (28 cm2)
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 oz. (.4 kg)
S e n so r O u t pu t
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 15
Dry/Wet Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . User-selectable
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.5
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 to 54 seconds
I n p u t/ O u tp u t
Supply Voltage and Current . . . . . . . . . . . . . . . . . . . . . . 100 µA (typical) @ 3 VDC
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 to 3 VDC
Connections
Yellow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 VDC
Red . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ground
Green . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output
P a c k a g e D i m e n si o ns
Product # Package Dimensions
(Length x Width x Height) Package Weight UPC Codes
6420 5.75" x 4.25" x 3.25"
(146 mm x 108 mm x 83 mm) 1.0 lbs. (.5 kg) 011698 00238 2
Produktspecifikationer
| Varumärke: | Davis |
| Kategori: | Inte kategoriserad |
| Modell: | DAV-6420 |
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