The HOBOnet Leaf Wetness Sensor provides accurate leaf wetness data for a variety of growing and research applications. The sensor is ready to use and does not require any painting or coating. It 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 weather station or pass data through other wireless sensors back to the central station. They are preconfigured and ready to deploy, and data is accessed through HOBOlink, Onset’s innovative cloud-based software platform.
A complete system requires at least one HOBO RX3000 Remote Monitoring Station, a HOBOnet Wireless Manager (RXMOD-RXW-xxx), and a HOBOnet Wireless Sensor. HOBOnet Wireless Repeaters (RX-RPTR-xxx) can be added to extend the range.
Highlighted Features
Does not require any painting or coating
Preconditioned for consistent measurements
3-meter cable and mounting bracket included
Wireless Features
868 MHz wireless mesh self-healing technology
450 to 600 meter wireless range and up to five hops
Up to 50 wireless sensors per RX3000
Simple button-push to join the HOBOnet wireless network
Onboard memory to ensure no data loss
Powered by rechargeable AA batteries and built-in solar panel
The RXW-LWA-xxx sensor supports the following measurement: Leaf Wetness
| Sensor | ||
| 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 | |
| Resolution | 0.59% | |
| Stability (Drift) | < ±5% per year (in typical growth conditions) | |
| Service Life | 3 years in typical growth conditions | |
| 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 | 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 | |
| Duty Cycle | <1% | |
| Maximum Number of Motes | 50 motes per one RX Wireless Sensor Network | |
| Battery Type/ Power Source |
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 |
|
| Memory | 16 MB | |
| 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 |
|
| Compliance Marks |  RXW-WCG-900 |
|
 RXW-WCG-868 |
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 RXW-WCG-922 |
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