Hobo RXW-WCF Series Manual

HOBO® RX Wireless Sensor Network
RXW Davis® Wind Speed and Direction Sensor (RXW-WCF-xxx) Manual
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)
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
Measurement Range
Accuracy
Resolution
Starting Threshold
Turning Radius
Measurement Definition
Wireless Mote
Operating Temperature
Range
Radio Power
Transmission Range
Wireless Data Standard
Radio Operating
Frequencies
Modulation Employed
Data Rate
Duty Cycle
Maximum Number of
Motes
Battery Type/
Power Source
Battery Life
Dimensions
Weight
Wind Speed/Gust
0 to 76 m/sec (0 to 170 mph)
±1.1 m/sec (±2 mph) or ±5% of
reading, whichever is greater
0.5 m/sec (1.1 mph)
≤1 m/sec (2.2 mph)
108 mm (4.25 in.)
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
-25° to 60°C (-13° to 140°F) with rechargeable batteries
-40 to 70°C (-40 to 158°F) with lithium batteries
12.6 mW (+11 dBm) non-adjustable
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
IEEE 802.15.4
RXW-WCF-900: 904–924 MHz
RXW-WCF-868: 866.5 MHz
RXW-WCF-922: 916–924 MHz
OQPSK (Offset Quadrature Phase Shift Keying)
Up to 250 kbps, non-adjustable
<1%
50 motes per one RX Wireless Sensor Network
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)
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
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)
Sensor and cable: 1.332 kg (2 lb, 15 oz)
Mote: 223 g (7.87 oz)
Wind Direction
0 to 355 degrees
±7 degrees
1 degrees (0 to 355 degrees)
1 m/sec (2.2 mph)
Approximately 135 mm (5.25 in.)
Unit vector averaging used; vector
components for each wind
measurement are calculated every
three seconds for duration of
logging interval (see Measurement
Operation)