Canada’s Instrumentation Leader Since 1946.
Provides accurate leaf wetness data for a variety of growing and research applications. This preconfigured, ready-to deploy sensor requires no painting or coating, uses a capacitive grid that is less sensitive to surface residues than resistive grid-based sensors, and comes preconditioned for long-term stability and consistent measurements between sensors.
HOBOnet wireless sensors communicate data directly to the HOBO RX3000 or the HOBO MicroRX station or pass data through other wireless sensors back to the central station. Data is accessed through HOBOlink, Onset’s innovative cloud software platform.
In what environment does this sensor operate?
This sensor operates in an outdoor environment.
What measurements does this sensor support?
The RXW-LWA-xxx sensor supports the following measurement: Leaf Wetness
|Measurement Range||0 (dry) to 100% (wet)|
|Sensor Type||Capacitive grid|
|Interchangeability Between Sensors (Over the Range 10-90% Wet)||±10%|
|Repeatability||±5%; see Note 1|
|Stability (Drift)||< ±5% per year (in typical growth conditions)|
|Service Life||3 years in typical growth conditions|
|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||Reliable connection to 457.2 m (1,500 ft) line of sight at 1.8 m (6 ft) high
Reliable connection to 609.6 m (2,000 ft) line of sight at 3 m (10 ft) high
|Wireless Data Standard||IEEE 802.15.4|
|Radio Operating Frequencies||RXW-LWA-900: 904-924 MHz
RXW-LWA-868: 866.5 MHz
RXW-LWA-922: 916-924 MHz
|Modulation Employed||OQPSK (Offset Quadrature Phase Shift Keying)|
|Data Rate||Up to 250 kbps, non-adjustable|
|Maximum Number of Motes||50 motes per one RX Wireless Sensor Network|
|Two AA 1.2 V 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 grid: 4.7 x 5.1 cm (1.8 in x 2.0 inches)
Sensor housing: 12.2 x 1.8 cm (4.8 in x 0.7 inches)
Mounting bracket: 20 x 3 x 0.5 cm (8 x 1.3 x 0.2 inches)
Cable length: 2 m (6.56 ft)
Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 inches)
|Weight||Sensor and cable: 127 g (4.5 oz); with bracket: 290 g (10.2 oz)
Mote: 223 g (7.87 oz)
|Materials||Sensor: PVC housing, epoxy potting compound, nylon grommet, FR-4 circuit board, PVC cable jacket
Bracket: PVC mounting bracket, UV-stable nylon cable ties, zinc dichromate plated steel U-bolts
Mote: PCPBT, silicone rubber seal
|Environmental Rating||Sensor and cable: Weatherproof
Mote: IP67, NEMA 6