| Soil Moisture: Volumetric Water Content (VWC) |
| Measurement Range |
0.000 to 1.000 m³/m³ in most soils |
| Accuracy |
±0.02 m³/m³ (±2%) in most soils typical from 0° to 50°C (32° to 122°F)* |
| Resolution |
0.001 m³/m³ |
| Temperature |
| Measurement Range |
-20° to 70°C (-4° to 158°F) |
| Accuracy |
±0.5°C (0.9°F) |
| Resolution |
0.1°C (0.18°F) |
| Depths Measured |
| RXW-GP3-xxx |
45 cm (18 inches) total; three soil moisture zones, six temperature depths |
| RXW-GP4-xxx |
60 cm (24 inches) total; four soil moisture zones, seven temperature depths |
| RXW-GP6-xxx |
90 cm (35 inches) total; six soil moisture zones, eleven temperature depths |
| Wireless Mote |
| Operating Temperature Range |
Sensor: -20° to 70°C (-4° to 158°F)
Mote: -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-GPx-900: 904–924 MHz
RXW-GPx-868: 866.5 MHz
RXW-GPx-921: 921 MHz
RXW-GPx-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 |
Up to 50 wireless sensors or 336 data channels per one HOBO RX station |
| Logging Rate |
Maximum logging interval: 18 hours
Recommended minimum logging interval: |
| |
Using Solar Power with Rechargeable Batteries |
Using Non-Rechargeable Lithium Batteries |
| RXW-GP3-xxx: |
5 minutes year round |
10 minutes |
| RXW-GP4-xxx: |
5 minutes summer, 10 minutes winter |
15 minutes |
| RXW-GP6-xxx: |
5 minutes summer, 10 minutes winter |
15 minutes |
| See Battery Life specification for more details. |
| Number of Data Channels |
RXW-GP3-xxx: 10
RXW-GP4-xxx: 12
RXW-GP6-xxx: 18 |
| Battery Type/Power Source |
Two AA 1.2V rechargeable NiMH batteries, powered by built-in solar panel or two AA 1.5 V non-rechargeable 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 Mounting and Positioning the Mote), operation outside this range will reduce the battery service life
With non-rechargeable lithium batteries:
RXW-GP3-xxx: 1 year with a 10-minute logging interval
RXW-GP4-xxx: 1 year with a 15-minute logging interval
RXW-GP6-xxx: 7 months with a 15-minute logging interval |
| Memory |
16 MB |
| Dimensions |
RXW-GP3-xxx sensor length: 53.2 cm (20.9 inches)
RXW-GP4-xxx sensor length: 68.2 cm (26.9 inches)
RXW-GP6-xxx sensor length: 98.2 cm (38.7 inches)
Sensor diameter: 3 cm (1.2 inches)
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 |
RXW-GP3-xxx sensor: 351 g (12.4 oz)
RXW-GP4-xxx sensor: 408 g (14.4 oz)
RXW-GP6-xxx sensor: 526 g (18.6 oz)
Cable: 190 g (6.7 oz)
Mote: 223 g (7.87 oz) |
| Materials |
Sensor: Polycarbonate housing encasing epoxy sealed circuit board
Cable: Polyurethane
Mote: PCPBT, silicone rubber seal |
| Environmental Rating |
Mote: IP67, NEMA 6 |
| Compliance Marks* |
    |