HOBO® RX Wireless Sensor Network
RXW Davis® Wind Speed and Direction Sensor (RXW-WCF-xxx) Manual
22245-2
This sensor measures wind speed and direction and is designed to work with the HOBO RX
Wireless Sensor Network in which data is transmitted wirelessly from the sensor mote across
the network to the RX3000 station and then uploaded to HOBOlink® web-based software. With
HOBOlink, you can monitor sensor readings, view graphs, set up alarms, download data, and
more.
Specifications
Sensor
Wind Speed/Gust
Wind Direction
Measurement Range
0 to 76 m/sec (0 to 170 mph)
0 to 355 degrees
Accuracy
±1.1 m/sec (±2 mph) or ±5% of
reading, whichever is greater
±7 degrees
Resolution
0.5 m/sec (1.1 mph)
1 degrees (0 to 355 degrees)
Starting Threshold
≤
1 m/sec (2.2 mph)
1 m/sec (2.2 mph)
Turning Radius
108 mm (4.25 in.)
Approximately 135 mm (5.25 in.)
Measurement Definition
Cup revolutions are accumulated
every three seconds for the
duration of the logging interval (see
Measurement Operation
)
Wind speed
: Average speed for the
entire logging interval
Gust speed:
The highest three-
second wind recorded during the
logging interval
Unit vector averaging used; vector
components for each wind
measurement are calculated every
three seconds for duration of
logging interval (see
Measurement
Operation
)
Wireless Mote
Operating Temperature
Range
-25° to 60°C (-13° to 140°F) with rechargeable batteries
-40 to 70°C (-40 to 158°F) with lithium batteries
Radio Power
12.6 mW (+11 dBm) non-adjustable
Transmission Range
At least 304.8 m (1,000 ft) line of sight at 1.8 m (6 ft) from the ground,
457.2 m (1,500 ft) typical
Wireless Data Standard
IEEE 802.15.4
Radio Operating
Frequencies
RXW-WCF-900: 904–924 MHz
RXW-WCF-868: 866.5 MHz
RXW-WCF-922: 916–924 MHz
Modulation Employed
OQPSK (Offset Quadrature Phase Shift Keying)
Data Rate
Up to 250 kbps, non-adjustable
Duty Cycle
<1%
Maximum Number of
Motes
50 motes per one RX Wireless Sensor Network
Battery Type/
Power Source
Two AA 1.2V rechargeable NiMH batteries, powered by built-in solar panel
or two AA 1.5 V lithium batteries for operating conditions of -40 to 70°C (-40
to 158°F)
Battery Life
With NiMH batteries: Typical 3–5 years when operated in the temperature
range -20° to 40°C (-4°F to 104°F) and positioned toward the sun (see
Deployment and Mounting
), operation outside this range will reduce the
battery service life
With lithium batteries: 1 year, typical use
Dimensions
Sensor: 470 x 191 x 121 mm (18.5 x 7.5 x 4.75 in.)
Cable length: 3 m (9.8 ft)
Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 inches)
Weight
Sensor and cable: 1.332 kg (2 lb, 15 oz)
Mote: 223 g (7.87 oz)
RXW Davis Wind Speed &
Direction Sensor
Models:
•
RXW-WCF-900 (US)
•
RXW-WCF-868 (Europe)
•
RXW-WCF-922
(Australia/NZ)
Items Included:
•
Cable ties
Items required:
•
Weather-resistant cable
ties or cable clips
•
Electrical tape
•
Handheld compass, local
area map, or handheld GPS
If mounting on tripod or mast:
•
Adjustable wrench
If mounting on wooden surface:
•
Drill with 5 mm (3/16 inch)
drill bit
Accessories:
•
Grounding kit (M-GKA)