RXW-RGF-868 Davis HOBOnet Rainfall (metric) Sensor

Overview

Records rainfall in 0.2-millimeter increments. 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. They are preconfigured and ready to deploy, and data is accessed through HOBOlink, Onset's innovative cloud software platform.

Features



Sensor Features

• 0.2 millimeter resolution
• Bird spikes
• Anti-debris screen that snaps into place
• Designed to meet World Meteorological Organization (WMO) guidelines
  
  
  
  

Wireless Features

• 900 MHz 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 built-in solar panel

Specifications

Measuring range
0 to 10.2 cm (0 to 4 in) per hour, maximum of 4000 points per recording interval

Accuracy

±4.0%, ±1 rain count between 0.2 and 50.0 mm (0.01 to 2.0 in) per hour; ±5.0%, ±1 rain count between 50.0 and 100.0 mm (2.0 to 4.0 in) per hour

Resolution

0.01 in.

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) not adjustable

Transmission Range

Reliable line-of-sight connection from 457.2 m (1500 ft) to 1.8 m (6 ft) high

Reliable line-of-sight connection from 609.6 m (2000 ft) to 3 m (10 ft) high

Wireless Data Standard

IEEE 802.15.4

Radio Operation Frequencies

• RXW-RGF-900: 904-924 MHz
  
• RXW-RGF-868: 866.5 MHz
  
• RXW-RGF-922: 916-924 MHz
  
• RXW-RGF-921: 921 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


Recording rate

1 minute to 18 hours


Number of data channels

2


Battery type/Power supply

Two 1.2V AA NiMH rechargeable batteries, powered by built-in solar panel or two 1.5V AA lithium batteries for operating conditions of -40° to 70° C (-40° to 70° F) 158° F)



Battery life

With NiMH batteries: Typically 3 to 5 years when used in a range 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: 16.5 cm (6.5 in) opening diameter x 24 cm (9.5 in) high; 214 cm2 (33.2 in2) collection area


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 in)


Weight

Sensor and cable: 1.2 kg (2.7 lbs) Mote: 223 g (7.87 oz)


Materials

Sensor: UV-stabilized ABS plastic housing; Tilting spoon mechanism with magnetic reed switch that rotates on a metal shaft

Mote: PCPBT, silicone rubber seal


Environmental rating

Sensor: Weatherproof

Mote: IP67, NEMA 6