HOBOnet TEROS 21 Soil Water Potential/Temp Sensor

SKU: RXW-T21-921

Description

The HOBOnet TEROS 21 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 TEROS 21 Sensor is designed to withstand harsh environmental conditions, and it doesn’t require calibration for different soil types or salinity.

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.

Highlighted Features

  • Soil water potential and soil temperature measurements with one device
  • A more accurate picture of the amount of water available to plants than volumetric water content sensors
  • No calibration required for soil type or salinity
  • Long-lasting and maintenance-free with durable epoxy construction
  • Wide measurement range: -9 to -2000 kPa

In what environment does this sensor operate?

This sensor operates in an outdoor environment.

What measurements does this sensor support?

The RXW-T21-921 sensor supports the following measurements: Soil Moisture, Soil Temperature and Soil Water Potential

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.

Wireless Mote

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Operating Temperature Range

-25° to 60°C with rechargeable batteries
-40 to 70°C with lithium 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
Reliable connection to 609.6 m (2,000 ft) line of sight at 3 m (10 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: 9.6 x 3.5 x 1.5 cm (3.8 x 1.4 x 0.6 inches)
Sensor diameter: 3.2 cm (1.3 inches)
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)

Weight

RXW-T21-921 sensor and cable: 103 g (3.65 oz)
Mote: 223 g (7.87 oz)

Material

Sensor: UV-stabilized ABS plastic housing; tipping bucket mechanism with magnetic reed switch pivots on metal shaft
Mote: PCPBT, silicone rubber seal

Environmental Rating

Mote: IP67, NEMA 6

Water Potential Sensor

.

Dielectric Measurement Frequency

70 Mhz

Temperature Sensor

.

Measurement Range

-40 to 60°C

Accuracy

±1°C

Resolution

0.1°C

Data Sheet

Download

Manual

Download

Quick Start Guide

Download