HOBOnet Soil Moisture 10HS Sensor

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- Manufacturer: HOBO

- Model: ECH2O™ 10HS

Integrates the field-proven ECH2O™ 10HS Sensor and provides readings directly in volumetric water content. The 10cm probes measure soil moisture over a larger volume of soil, helping to average out any soil variability. The sensor’s high-frequency design minimizes sensitivity to salinity and textural effects, and gives it a wide measurement range.
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.

Sensor Features

±3% accuracy in typical soil conditions, and ±2% accuracy with soil-specific calibration
Measures a large 1-liter volume of soil, providing a more accurate picture of average soil moisture
High-frequency (70 MHz) circuit provides good accuracy even in high-salinity and sandy soils.

Wireless Features

	RXW-SMC-xxx	RXW-SMD-xxx
Measurement Range	In soil: 0 to 0.550 m³/m³ (volumetric water content)	In soil: 0 to 0.570 m³/m³ (volumetric water content)
Extended Range	-0.401 to 2.574 m³/m³	-0.659 to 0.6026 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	±0.033 m³/m³ (±3.3%) typical 0 to 50°C (32° to 122°F) for mineral soils up to 10 dS/m and ±0.020 m³/m³ (±2%) with soil specific calibration
Resolution	0.3 liters (10.14 oz)	1 liter (33.81 oz)
Volume of Influence	70 MHz	70 MHz
Sensor Frequency	70 MHz	70 MHz
METER ECH2O Probe Part No.	EC-5	10HS
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.	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. Extended temperatures above 50°C (122°F) will decrease mote battery life.

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 and RXW-SMD-900: 904-924 MHz
- RXW-SMC-868 and RXW-SMD-868: 866.5 MHz
- RXW-SMC-921 and RXW-SMD-921: 921 MHz
- RXW-SMC-922 and RXW-SMD-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: Up to 50 wireless sensors or 336 data channels per one HOBO RX station
Logging Rate: 1 minute to 18 hours
Number of Data Channels: 2
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 Deployment and Mounting), operation outside this range will reduce the battery service life
- With lithium batteries: 1 year, typical use
Memory: 16 MB
Materials:
- Sensor: Weatherproof
- Mote: PCPBT, silicone rubber seal
Environmental Rating: Mote: IP67, NEMA 6

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