Hobo RXW-T21-xxx – Onset

HOBOnet soil water potential and temperature sensor, a complete system requires at least one Hobo RX3000 monitoring station with a HOBOnet wireless manager (RXMOD-RXW-xxx) or one Hobo MicroRX station (which has an integrated HOBOnet wireless manager).

The HOBOnet T21 is a wireless sensor that works with the HOBOnet system to measure both soil temperature and soil water potential, a more accurate way to measure how much water is available to plants. The HOBOnet T21 Sensor is designed to withstand harsh environmental conditions, and it does not require calibration for different soil types or salinity. The HOBOnet T21 is calibrated in a chamber system that allows the T21 set calibration points from -10KPa to -80KPa. With its durable epoxy coating, you can be confident these sensors can be deployed in the ground for long periods, while providing data you can trust.

The HOBOnet system is a cost-effective and scalable option for web-enabled monitoring of field conditions for applications such as crop management, research, and greenhouse operations. And because it’s wireless, you can deploy a network of sensors to easily monitor multiple points with a single system, while avoiding the risk of long cables that can interfere with field operations and are potentially vulnerable to nearby lightning strikes. Sensors are easily linked to the network and data can be accessed through HOBOlink, Onset’s innovative cloud-based software platform.

This sensor measures the soil water potential and the soil temperature measurements with this measured data you can get a more accurate picture of the amount of water available to plants than volumetric water content sensors. There is no calibration required for soil type or salinity and this is long-lasting and maintenance-free sensor with durable epoxy construction. It has a wide measurement range from -9 to -2000 kPa.

This wireless sensor communicates through a 900 MHz wireless mesh self-healing technology. 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-T21-xxx sensor supports the following measurements: soil temperature and soil water potential.

Technical specifications

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

Measurement range: -40 to 60°C

Accuracy: ±1°C

Operating temperature range: -40° 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: 3

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: mote: IP67, NEMA 6

CheckOptional with calibration

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