Temperature, soil humidity and conductivity sensor for HOBOnet network RXW-T11-868

One wireless sensor that works with the system HOBOnet to not only provide advanced measures of'soil moisture (volumetric water content) with better accuracy, but also measure the soil temperature and electrical conductivity.
Designed to withstand difficult environmental conditions, this sensor sustainable lasts up to 10 years, so you can leave them on the ground for long periods. The stainless steel probe tips sharpened facilitate installation, even in hard soils, and an increased volume of influence provides more accurate results.
The HOBOnet T12 is based on over 20 years of soil moisture research and has70 MHz frequency capacity echnology, minimizing salinity and texture effects.
The HOBOnet system is a wireless sensor network economic and social online monitoring field conditions for applications such as crop management, research and greenhouse. And because he is 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 lightning strikes nearby.
The sensors are easily connected to the network and the data are accessible via HOBOlink, the software platform cloud innovative'Onset.

We suggest you use the verification clip TEROS-CLIP(see associated products below).

The verification clip provides a convenient way to confirm the operation and accuracy of soil moisture in HOBOnet T11 and T12 sensors. The attachment of this clamp to a sensor provides a level of soil moisture known to verify the accuracy of the measurement, without having to test the sensor in real soils, which normally requires weighing soil samples and drying them in an oven.

Sensor characteristics:

- Measurement of soil moisture (volumetric water content), soil temperature and electrical conductivity with a single apparatus
- The sensor lasts up to 10 years in the field
- The largest volume of influence (1010 ml) in relation to sensor size, resulting in more accurate measurements of soil moisture
- Easy installation with sharp stainless steel probes that are more resistant to damage/deterioration
- Less sensor to sensor variability

1. Soil humidity: volumetric water content (VWC)

- Measuring range*: 0.00 to 0.70 m3/m3 in mineral soils
- Accuracy: ±0.030 m3/m3 (±3%) typical from 0 to 50°C (32 to 122°F); ±0.020 m3/m3 (±2%) with specific ground calibration
- Resolution: 0.001 m3/m3
- Dielectric measurement frequency: 70 MHz

2. Soil temperature**:

- Measuring range: -40 to 60°C (-40 to 140°F)
- Accuracy:
±1.0°C (1.8°F) from -40 to 0°C (-40 to 32°F)
±0.5°C (0.9°F) from 0 to 60°C (32 to 140°F)
- Resolution: 0.1 °C (0.18 °F)

3. Electrical conductivity in bulk (EC)

- Measuring range: 0 to 20 dS/m (bulk)
- Accuracy:
±5% reading + 0.01 dS/m from 0 to 10 dS/m
±8% reading 10 to 20 dS/m
- Resolution: 0.001 dS/m

* Sensor data may be recalibrated if necessary (e.g. the sensor is used in non-mineral soil types or higher accuracy than standard is required). Users can apply a calibration equation to data exported from HOBOlink. The VWC range will depend on the calibration equation.

** The temperature measurement for applicable sensors may not be accurate if the sensor is not fully immersed in the environment of interest due to longer balancing time.

Wireless Features:

- 868 MHz wireless mesh self-healing technology
- Wireless range from 450 to 600 metres (1,500 to 2,000 feet) and up to five jumps
- Up to 50 wireless sensors or 336 data channels per HOBO RX station
- Just press a button to join the HOBOnet wireless network
- Onboard memory to avoid data loss
- Powered by rechargeable AA batteries and integrated solar panel
- Operating temperature range:
Sensor : -40 to 60°C (-40 to 140°F)
Sensor :
-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) not adjustable
- Transmission range:
Reliable connection to a 457.2 m (1,500 ft) sight line at a height of 1.8 m (6 ft)
Reliable connection to a 609.6 m (2 000 ft) sight line at a height of 3 m (10 ft)
- Wireless data standard: IEEE 802.15.4
- Radio operating frequencies RXW-T11-868: 866.5 MHz
- Modulation employed: OQPSK (decalation of modulation by quadrature phase displacement)
- Data flow rate: up to 250 kbps, not adjustable
- Service cycle: - Maximum number of points: up to 50 wireless sensors or 336 data channels per HOBO RX station
- Log rate: 1 minute at 6 p.m
- Number of data channels: 4
- Type of battery / power source:
2 rechargeable NiMH batteries AA 1.2 V, powered by an integrated solar panel
or
2 AA 1.5 V lithium batteries for operating conditions of -40 to 70 °C (-40 to 158 °F)
Battery life:
With NiMH batteries : 3 to 5 years in case of use in a temperature range of -20 °C to 40 °C (-4 °F to 104 °F) and positioned towards the sun (see Mounting and positioning of the mote), operation outside this range will reduce battery life
With lithium batteries : 1 year, typical use
- Memory : 16 MB
Dimensions:
Sensor: 7,47 x 9,4 x 2,39 cm (2,94 x 3,7 x 0,94 inches)
Sensor needle length: 5.4 cm (2.13 inches)
Sensor needle diameter: 0.32 cm (0.13 inches)
Cable length: 5 m (16.4 feet)
Mote: 16,2 x 8,59 x 4,14 cm (6,38 x 3,38 x 1,63 inches)
- Weight:
Sensor and cable RXW-T11-xxx: 245 g (8.64 oz)
Mote: 223 g (7.87 oz)
- Materials:
Sensor: ASA plastic body with epoxy polyurethane filling and stainless steel pins
Cable: PVC, UV resistant and rodent resistant
Mote: PPCBT, silicone rubber seal
- Environmental assessment: IP67, NEMA 6

Contents of the box:

- Soil humidity/temperature sensor HOBOnet T12
- Cable hooks
- Screws