RXW-WCG-868 HOBOnet Ultrasonic Wind Speed & Direction Sensor

Overview

Wireless ultrasonic wind speed and direction sensor powered by HOBOnet. Compact and rugged with no moving parts, this ultrasonic sensor can measure very low wind speeds down to 0.4 m/s (compared to 1.0 m/s for our mechanical sensors). HOBOnet wireless sensors communicate data directly to the HOBO RX3000 or HOBO MicroRX station or transmit data via other wireless sensors to the central station. They are pre-configured and ready to deploy, and data is accessed through HOBOlink, Onset's innovative cloud-based software platform.




Features

Sensor Features

• Compact and rugged with no moving parts
• No start-up threshold – suitable for low speed winds
• No wind direction deadband – accurate wind data in all directions
• Powered by its own integrated solar panel
  
  

Wireless Features

• 900MHz wireless mesh self-healing technology
• Wireless range of 450 to 600 meters (1500 to 2000 feet) and up to five hops
• Up to 50 wireless sensors or 336 data channels per HOBO RX station
• Simply press a button to join the HOBOnet wireless network
• Built-in memory to ensure no data is lost
• Powered by rechargeable AA batteries and integrated solar panel

Specifications

Sensor

Wind Speed/Gust Direction

Measuring Range 0 to 41.16 m/s (0 to 92.07 mph) 0 to 359 degrees

Accuracy ±0.8 m/s (1.79 mph) or ±4% of reading, whichever is greater 0.2 to 3 m/s (0.44-6.7 mph): ±4 degrees
>3 m/s (6.7 mph): ±2 degrees

Resolution: 0.4 m/s (0.89 mph) 1 degree (0 to 359 degrees)

Measurement Definition Wind speed readings are taken every three seconds during the recording interval

Wind Speed: Average speed for the entire recording interval

Gust Speed: Highest three-second wind recorded during the recording interval

See Measurement Operation. The unit vector average is used; Vector components of each wind measurement are calculated every three seconds during the recording interval (see Measurement Operation)

Operating temperature range Icing-free
-15°C to 55°C
5°F to 131°F



Wireless mote

Operating temperature range
-25°C to 60°C (-13°F to 140°F) with rechargeable batteries
-40°C to 70°C (-40°F to 158°F) with lithium batteries

Radio power
12.6 mW (+11 dBm) not adjustable

Transmission range
Reliable line-of-sight connection from 457.2 m (1500 ft) at 1.8 m (6 ft) in height
Reliable line-of-sight connection from 609.6 m (2000 ft) at 3 m (10 ft) in height

Wireless data standard
IEEE 802.15.4

Radio Operating Frequencies
RXW-WCG-900: 904-924 MHz
RXW-WCG-868: 866.5 MHz
RXW-WCG-921: 921 MHz
RXW-WCG-922: 916-924 MHz

Modulation Used
OQPSK Quadrature Phase Shift Keying with offset

Data Rate
Up to 250 kbps, not adjustable

Duty Cycle
<1%

Maximum Number of Motes
Up to 50 wireless sensors or 336 data channels per one HOBO RX Station

Logging Rate
1 minute to 18 hours

Number of Data Channels
4

Battery Type/Power Supply
Sensor: Photovoltaic Panel, 3.2V LIFEP04 Battery - 600 mAh
Mote: Two 1.2V AA NiMH rechargeable batteries powered by
integrated solar panel or two 1.5V AA lithium batteries for operating
conditions of -40 to 70°C (-40 to 158°F)

Battery Life
With NiMH batteries: Typically 3 to 5 years when used in a temperature
range of -20 to 40°C (-4 to 104°F) and facing the sun (see Deployment
and Mounting); Operation outside this range will reduce battery life
With lithium batteries: 1 year, typical use


Memory
16 MB

Dimensions
Sensor length: 380 mm (14.96 in)
Sensor head diameter: 60 mm (2.36 in)
Sensor rod diameter: 16 mm (0.63 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 in)


Weight
Sensor and cable: 200 g (7 oz)
Mote: 223 g (7.87 oz)

Materials
Sensor: Polyacetal
Sheathing: PCPBT, silicone rubber seal


Environmental rating
Sensor and cable: Weatherproof
Sheathing: IP67, NEMA 6