Wireless Mote | . |
---|---|
Operating Temperature Range | -25° to 60°C with rechargeable 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 |
Wireless Data Standard | IEEE 802.15.4 |
Radio Operating Frequencies | 921 Mhz |
Modulation Employed | OQPSK (Offset Quadrature Phase Shift Keying) |
Data Rate | Up to 250 kbps, non-adjustable |
Duty Cycle | <1% |
Maximum Number of Motes | 50 motes per one RX Wireless Sensor Network |
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 |
Battery Life | With NiMH batteries: Typical 3–5 years when operated in the temperature range -20° to 40°C 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 |
Dimension | Sensor diameter: 3 cm (1.2 inches) |
Weight | Cable: 190 g (6.7 oz) |
Material | Sensor: Polycarbonate housing encasing epoxy sealed circuit board |
Environmental Rating | Mote: IP67, NEMA 6 |
Soil Moisture: Volumetric Water Content (VWC) Sensor | . |
Measurement Range | 0.000 to 1.000 m³/m³ in most soils |
Temperature Sensor | . |
Measurement | -20° to 70°C |
Accuracy | ±0.5°C |
Resolution | 0.1°C |
RXW-GP3-921 | 45 cm (18 inches) total; three soil moisture zones, six temperature depths |
RXW-GP4-921 | 60 cm (24 inches) total; four soil moisture zones, seven temperature depths |
RXW-GP5-921 | 90 cm (35 inches) total; six soil moisture zones, eleven temperature depths |








HOBOnet Multi-Depth Soil Moisture Sensor
Overview
The HOBOnet Multi-Depth Soil Moisture Sensor is a wireless sensor that works with the HOBOnet system to measure soil moisture and soil temperature at multiple depths with a single probe, for fast and easy installation. This durable sensor is available in three probe lengths for measurements from 45 cm (18 in) to 90 cm (35 in) deep.
The HOBOnet system is a cost-effective and scalable wireless sensor network 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. Sensors are easily linked to the network, and data can be accessed through HOBOlink®, Onset’s innovative cloud-based software platform.
Sensor Features
- Available in three probe lengths: 45 cm (18 in), 60 cm (24 in), and 90 cm (35 in)
- Soil moisture measurements over entire probe segment lengths
- Soil temperature measurements at multiple points
- Largest volume of influence per measurement (2 L volume of influence per 15 cm segment)
- Advanced filtering of 400,000 pulses per measurement eliminates outlying readings and provides precise, repeatable soil moisture data
- Polycarbonate housing and epoxy-sealed circuit board protect vital components during installation and throughout deployment
- Easy installation with minimal soil disturbance.
Wireless Features
- 921 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 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
In what environment does this operate?
This operates in an outdoor environment.
What measurements does this support?
The supports the following measurements: Soil Moisture and Soil Temperature
What’s in the Box?
- HOBOnet Multi-Depth Soil Moisture Sensor
- Two AA 1.2V rechargeable NiMH batteries
- Cable ties
- Screws
Important Info:
A complete system requires at least one HOBO RX Remote Monitoring Station, a HOBOnet Wireless Manager (RXMOD-RXW-921), and a HOBOnet Wireless Sensor. HOBOnet Wireless Repeaters (RX-RPTR-921) can be added to extend the range.