Onset HOBOnet RXW TEROS-21 Manual

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HOBOnet® Wireless Sensor Network
RXW TEROS-21 Soil Water Potential Sensor (RXW-T21-xxx) Manual
RXW Soil Water Potential
Sensor
Models:
• RXW-T21-900 (US)
• RXW-T21-868 (Europe)
• RXW-T21-921 (Taiwan)
• RXW-T21-922
(Australia/NZ)
Included Items:
• Cable ties
• Screws
24850-B
This sensor measures water potential and temperature in numerous soil types. It is designed to
work with the HOBOnet (HOBO® RX) Wireless Sensor Network in which data is transmitted
wirelessly from the sensor mote across the network to the 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
Water Potential
Measurement Range -2,000 to -9 kPa in soils up to 10 dS/m
Accuracy* ±10% of reading + 2 kPa from -100 to -9 kPa
Resolution 0.1 kPa
Dielectric Measurement
70 MHz
Frequency
Temperature
Measurement Range -40° to 60°C (-40° to 140°F)
Accuracy ±1°C (1.8°F)
Resolution
0.1°C (0.18°F)
Wireless Mote
Operating Temperature Sensor: -40° to 60°C (-40° to 140°F)
Range Mote: -25° to 60°C (-13° to 140°F) with rechargeable 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 RXW-T21-900: 904–924 MHz
Frequencies RXW-T21-868: 866.5 MHz
RXW-T21-921: 921 MHz
RXW-T21-922: 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 Up to 50 wireless sensors or 336 data channels per one HOBO RX station
Motes
Logging Rate 1 minute to 18 hours
Number of Data Channels 3
Battery Type/
Two AA 1.2V rechargeable NiMH batteries, powered by built-in solar
Power Source 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
Mounting and Positioning the Mote), operation outside this range will
reduce the battery service life
With lithium batteries: 1 year, typical use
Memory 16 MB
Sensor: 9.6 x 3.5 x 1.5 cm (3.8 x 1.4 x 0.6 inches)
Dimensions
Sensor diameter: 3.2 cm (1.3 inches)
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 RXW-T21-xxx sensor and cable: 103 g (3.65 oz)
Mote: 223 g (7.87 oz)
-40° to 70°C (-40° to 158°F) with lithium batteries