Hobo RX Manual

HOBO® RX Wireless Sensor Network
RXW Davis® 0.01" or 0.2 mm Rain Gauge Sensor (RXW-RGx-xxx) Manual
RXW Davis 0.01" or
0.2 mm Rain Gauge
Sensor
Models:
• RXW-RGE-900 and
RXW-RGF-900 (US)
• RXW-RGE-868 and
RXW-RGF-868 (Europe)
• RXW-RGE-922 and
RXW-RGF-922
(Australia/NZ)
Items Included:
• Cable ties
Items required:
• Electrical tape or weather-
resistant cable ties
If mounting on pole or mast:
• 7/16 inch combination
wrench
If mounting on flat surface:
• Drill with 5 mm (3/16 inch)
drill bit
• Adjustable wrench
Accessories:
• Guy wire kit (M-GWA)
• 1.5 meter mast (M-MPB)
• Mast level (M-MLA)
22244-2
This sensor measures rainfall 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 0 to 10.2 cm (0 to 4 in.) per hour, maximum 4,000 tips per logging interval
Accuracy ±4.0%, ±1 rainfall count between 0.2 and 50.0 mm (0.01 and 2.0 in.) per
hour; ±5.0%, ±1 rainfall count between 50.0 and 100.0 mm (2.0 and 4.0 in.)
per hour
Resolution 0.01 in. (RXW-RGE-xxx) or 0.2 mm (RXW-RGF-xxx)
Calibration Requires annual calibration; can be field calibrated
Wireless Mote
Operating Temperature Mote: -25° to 60°C (-13° to 140°F) with rechargeable batteries
Range -40 to 70°C (-40 to 158°F) with lithium batteries
Radio Power 12.6 mW (+11 dBm) non-adjustable
Transmission Range 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
Wireless Data Standard IEEE 802.15.4
Radio Operating RXW-RGE-900 and RXW-RGF-900: 904–924 MHz
Frequencies RXW-RGE-868 and RXW-RGF-868: 866.5 MHz
RXW-RGE-922 and RXW-RGF-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 50 motes per one RX Wireless Sensor Network
Motes
Battery Type/ Two AA 1.2V rechargeable NiMH batteries, powered by built-in solar panel or
Power Source 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: 16.5 cm opening diameter (6.5 in.) x 24 cm (9.5 in.) high; 214 cm
(33.2 in.
Cable length: 2 m (6.6 ft)
Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 inches)
Weight Sensor and cable: 1.2 kg (2.7 lbs)
Mote: 223 g (7.87 oz)
Materials Sensor: UV-stabilized ABS plastic housing; tipping bucket mechanism with
magnetic reed switch pivots on metal shaft
Mote: PCPBT, silicone rubber seal
Environmental Rating Sensor: Weatherproof
Mote: IP67
Compliance Marks
2
) collection area
RXW-RGE-900 and RXW-RGF-900: See last page
RXW-RGE-868 and RXW-RGF-868: The CE Marking identifies this
product as complying with all relevant directives in the European
Union (EU).
RXW-RGE-922 and RXW-RGF-922: See last page
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