Hobo RXW-SMD-xxx – Onset

HOBOnet soil moisture 10HS sensor, a complete system requires at least one Hobo RX3000 monitoring station, a HOBOnet wireless manager (RXMOD-RXW-xxx) or one Hobo MicroRX station (which has an integrated HOBOnet wireless manager).

Wireless

The HOBOnet wireless soil moisture sensor integrates the field-proven ECH2O 10HS sensor and provides readings directly in volumetric water content. The 10 centimeter 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. The 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-based software platform.

This sensor has an ±3% accuracy in typical soil conditions and ±2% accuracy with soil-specific calibration. It measures a large 1-liter volume of soil, providing a more accurate picture of average soil moisture and the high-frequency (70 MHz) circuit provides a good accuracy even in high-salinity and sandy soils. It has a wireless signal range up to 450 to 600 meter and up to five hops, the HOBOnet wireless repeaters (RXW-RPTR-xxx or RXW-RPTR-B-xxx) can be added to extend the range. You can add up to 50 wireless sensors or 336 data channels per Hobo RX station. A simple button push makes sure to join the HOBOnet wireless network and it has an onboard memory to ensure no data loss. It is powered by rechargeable AA batteries and built-in solar panel. This sensor operates in an outdoor environment and the RXW-SMD-xxx sensor supports the following measurements: soil moisture.

Technical specifications

Measurement range: 0 to 0,570 m³/m³

Accuracy: ±0,033 m³/m³, 0 to 50°C

Operating temperature range: -25° to 60°C with rechargeable batteries and -40 to 70°C with lithium batteries

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 1,2 V 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

Battery life: with NiMH batteries: 3–5 years when operated in the temperature range -20° to 40°C and positioned toward the sun, with lithium batteries: 1 year

Memory: 16 MB

Cable length: 5 meters

Environmental rating: sensor: weatherproof and the mote: PCPBT, silicone rubber seal

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