RXW-SMD-900
•RXW-SMD-868
•RXW-SMD-922
•RXW-SMD-921
HOBOnet Soil Moisture 10HS Sensor
Important Information
A complete system requires at least one HOBO RX3000 Remote Monitoring Station, a HOBOnet Wireless Manager, and a HOBOnet Wireless Sensor, OR one HOBO MicroRX station (which has an integrated HOBOnet Wireless Manager) and a HOBOnet Wireless Sensor. HOBOnet Wireless Repeaters (RXW-RPTR-xxx or RXW-RPTR-B-xxx) can be added to extend the range.
Overview
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.
Features
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
- 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
Specifications
-
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; see Note 1 -0.659 to 0.6026 m³/m³; see Note 1 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 ±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; see Notes 4 and 5 Resolution 0.0007 m³/m³ (0.07%) 0.0008 m³/m³ (0.08%) Volume of Influence 0.3 liters (10.14 oz) 1 liter (33.81 oz) 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.
Wireless Mote
-
-25° to 60°C (-13° to 140°F) with rechargeable batteries-40° to 70°C (-40° to 158°F) with lithium batteries
-
12.6 mW (+11 dBm) non-adjustable
-
Reliable connection to 457.2 m (1,500 ft) line of sight at 1.8 m (6 ft) highReliable connection to 609.6 m (2,000 ft) line of sight at 3 m (10 ft) high
-
IEEE 802.15.4
-
RXW-SMC-900 and RXW-SMD-900: 904-924 MHzRXW-SMC-868 and RXW-SMD-868: 866.5 MHzRXW-SMC-921 and RXW-SMD-921: 921 MHzRXW-SMC-922 and RXW-SMD-922: 916-924 MHz
-
OQPSKOffset Quadrature Phase Shift Keying
-
Up to 250 kbps, non-adjustable
-
<1%
-
Up to 50 wireless sensors or 336 data channels per one HOBO RX station
-
1 minute to 18 hours
-
2
-
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)
-
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 lifeWith lithium batteries: 1 year, typical use
-
16 MB
-
RXW-SMC-xxx soil probe: 89 x 15 x 1.5 mm (3.5 x 0.62 x 0.06 in.)RXW-SMD-xxx soil probe: 160 x 32 x 2 mm (6.5 x 1.25 x 0.08 in.)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)
-
RXW-SMC-xxx sensor and cable: 180 grams (6.3 oz)RXW-SMD-xxx sensor and cable: 190 grams (6.7 oz)Mote: 223 g (7.87 oz)
-
Sensor: WeatherproofMote: PCPBT, silicone rubber seal
-
Mote: IP67, NEMA 6
Notices
-
Note 1: (RXW-SMC-xxx and RXW-SMD-xxx) The sensor is capable of providing readings outside the standard volumetric water content range. This is helpful in diagnosing sensor operation and installation. See the Sensor Operation section for more details.
-
Note 2: (RXW-SMC-xxx) This is a system level accuracy specification and is comprised of the probe’s accuracy of ±0.03 m³/m³ typical (±0.02 m³/m³ soil specific) plus the mote accuracy of ±0.001 m³/m³ at 25°C (77°F). There are additional temperature accuracy deviations of ±0.003 m³/m³ / °C maximum for the probe across operating temperature environment, typical <0.001 m³/m³ / °C. (The temperature dependence of the mote is negligible.)
-
Note 3: (RXW-SMC-xxx) Given the nature of the sensor design and sensor operating frequency, the system has inherent susceptibilities to Radio Frequency signals. The accuracy specification when subjected to certain RFI environments, such as those outlined in IEC 61000-4-3 and IEC 61000-4-6, is reduced to 0.061 m³/m³. The system level accuracy will be particularly affected when placed in an electric field of 3 V/m or greater in the 70 MHz range. RFI mitigation practices and physical deployment changes may reduce the systems susceptibility.
-
Note 4: (RXW-SMD-xxx) This is a system level accuracy specification and is comprised of the probe’s accuracy of ±0.03 m³/m³ typical (±0.02 m³/m³ soil specific) plus the mote accuracy of ±0.003 m³/m³ at 25°C (77°F). There are additional temperature accuracy deviations of ±0.003 m³/m³ / °C maximum for the probe across operating temperature environment, typical <0.001 m³/m³ / °C. (The temperature dependence of the mote is negligible.)
-
Note 5: (RXW-SMD-xxx): Given the nature of the sensor design and sensor operating frequency, the system has inherent susceptibilities to Radio Frequency signals. The accuracy specification when subjected to certain RFI environments, such as those outlined in IEC 61000-4-3 and IEC 61000-4-6, may be significantly reduced. The system level accuracy will be particularly affected when placed in an electric field of 3 V/m or greater in the 150 KHz to 1000 MHz range. RFI mitigation practices and physical deployment changes may reduce the systems susceptibility, however will yield reduced system accuracy. If deployments are planned in high RFI energy environments, Onset recommends on-site testing to determine system level accuracy.