HOBOnet T21 Soil Water Potential/Temp Sensor

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PT. Global Intan Teknindo

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Deskripsi

Overview

Sensor nirkabel yang bekerja dengan sistem HOBOnet untuk mengukur suhu tanah dan potensi air tanah, cara yang lebih akurat untuk mengukur berapa banyak air yang tersedia untuk tanaman. Sensor ini dirancang untuk tahan terhadap kondisi lingkungan yang keras, dan tidak memerlukan kalibrasi untuk jenis tanah atau salinitas yang berbeda. HOBOnet T21 dikalibrasi dalam sistem ruang yang memungkinkan T21 mengatur titik kalibrasi dari -10KPa hingga -80KPa. Dengan lapisan epoksi yang tahan lama, Anda dapat yakin bahwa sensor ini dapat digunakan di dalam tanah dalam jangka waktu lama, sekaligus memberikan data yang dapat Anda percayai.

Features

Sensor Features

  • Soil water potential and soil temperature measurements with one device
  • A more accurate picture of the amount of water available to plants than volumetric water content sensors
  • No calibration required for soil type or salinity
  • Long-lasting and maintenance-free with durable epoxy construction
  • Wide measurement range: -9 to -2000 kPa

Wireless Features

  • 900 MHz wireless mesh self-healing technology
  • 450 to 600 meter (1,500 to 2,000 feet) wireless range and up to five hops
  • Up to 50 wireless sensors or 336 data channels per HOBO RX station
  • Simple button-push to join the HOBOnet wireless network
  • Onboard memory to ensure no data loss
  • Powered by rechargeable AA batteries and built-in solar panel

Spesifikasi

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
Resolution0.1 kPa
Dielectric Measurement Frequency70 MHz
Temperature
Measurement Range-40 to 60°C (-40 to 140°F)
Accuracy±1°C (1.8°F)
Resolution0.1°C (0.18°F)
Wireless Mote
Operating Temperature RangeSensor: -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 Power12.6 mW (+11 dBm) non-adjustable
Transmission RangeReliable 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 StandardIEEE 802.15.4
Radio Operating FrequenciesRXW-T21-900: 904–924 MHz RXW-T21-868: 866.5 MHz RXW-T21-921: 921 MHz RXW-T21-922: 916–924 MHz
Modulation EmployedOQPSK (Offset Quadrature Phase Shift Keying)
Data RateUp to 250 kbps, non-adjustable
Duty Cycle<1%
Maximum Number of MotesUp to 50 wireless sensors or 336 data channels per one HOBO RX station
Logging Rate1 minute to 18 hours
Number of Channels3
Battery Type/ Power SourceTwo 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 LifeWith 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
Memory16 MB
DimensionsSensor: 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)
WeightRXW-T21-xxx sensor and cable: 103 g (3.65 oz) Mote: 223 g (7.87 oz)
MaterialsSensor: Vinyl body with polyurethane resin, stainless steel and ceramic sensor head Cable: PVC, UV resistant and rodent repellent Mote: PCPBT, silicone rubber seal
Environmental RatingMote: IP67, NEMA 6
Compliance Marks 
FCC Logo
 RXW-T21-900
ce
 RXW-T21-868
Taiwan NCC Mark
 RXW-T21-921
Australia/New Zealand General Compliance mark
 RXW-T21-922

* The sensor is not well calibrated beyond -100 kPa. For more information on using the sensor beyond this range, see Sensor Accuracy and Calibration.

** Temperature measurement, for applicable sensors, may not be accurate if sensor is not fully immersed in medium of interest, due to longer equilibration time.

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