Technical Information
|
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 Frequency |
70 MHz |
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 Range |
Sensor: -40 to 60°C (-40 to 140°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-T21-900: 904–924 MHz 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 Motes |
50 motes per one HOBOnet Wireless Sensor Network |
Battery Type/ Power Source |
Two AA 1.2V 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 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 |
Dimensions |
Sensor: 9.6 x 3.5 x 1.5 cm (3.8 x 1.4 x 0.6 inches) 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) |
Materials |
Sensor: Vinyl body with polyurethane resin, stainless steel and ceramic sensor head Cable: PVC, UV resistant and rodent repellent Mote: PCPBT, silicone rubber seal |
Environmental Rating |
Mote: IP67, NEMA 6 |
Compliance Marks |
See User Manual |