Características Destacadas
Características do sensor
Precisão de ±3% em condições típicas do solo, e precisão de ±2% com calibração específica do solo
Mede um volume de terra de 0,3 litros para efectuar leituras a uma determinada profundidade ou num recipiente
O circuito de alta frequência (70 MHz) proporciona boa precisão mesmo em solos de alta salinidade e arenosos
Características Wireless
Tecnologia de auto-recuperação de malha sem fio de 868 MHz
Distância sem fio de 450 a 600 metros
Até 50 sensores sem fios por RX3000
Com um simples toque de botão, é possível entrar na rede sem fio HOBOnet
Memória integrada para garantir que não haja perda de dados
Alimentação por pilhas recarregáveis AA e painel solar integrado
O sensor RXW-SMC-xxx suporta a seguinte medição: Humidade do Solo
Sensor
Measurement Range
In soil: 0 to 0.550 m³/m³ (volumetric water content)
Extended Range
-0.401 to 2.574 m³/m³
Accuracy
±0.031 m³/m³ (±3.1%) typical 0 to 50°C (32° to 122°F) for mineral soils up to 8 dS/m and ±0.020 m³/m³ (±2%) with soil specific calibration; see Notes 2 and 3
Resolution
0.0007 m³/m³ (0.07%)
Volume of Influence
0.3 liters (10.14 oz)
Sensor Frequency
70 MHz
Sensor Operating Temperature Range
0° to 50°C (32° to 122°F). Although the sensor probe and cable can safely operate at below-freezing temperatures (to -40°C/F), the soil moisture data collected at these extreme temperatures is outside of the sensor's accurate measurement range.
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-SMC-900: 904–924 MHz
RXW-SMC-868: 866.5 MHz
RXW-SMC-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
Cable length: 5 m (16.4 ft)
Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 inches)
Weight
Mote: 223 g (7.87 oz)
Materials
Sensor: Weatherproof
Mote: PCPBT, silicone rubber seal
Environmental Rating
Mote: IP67, NEMA 6
Compliance Marks
RXW-SMC-900
RXW-SMC-868
RXW-SMC-922
