HOBOnet Wireless Temperature Sensor

SKU: RXW-TMB-921

The HOBOnet Wireless Temperature Sensor provides a cost-effective and scalable solution for web-enabled monitoring of air temperature and humidity. HOBOnet Wireless Sensors communicate data directly to the RX Station or pass data through other wireless sensors back to the central station.

Description

The HOBOnet Wireless Temperature Sensor provides a cost-effective and scalable solution for web-enabled monitoring of air temperature. HOBOnet Wireless Sensors communicate data directly to the RX 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.

Sensor Features

  • Measurement range of -40° to 100°C
  • High accuracy: ± 0.2°C
  • Stainless-steel sensor tip
  • Sensor and cable rated for immersion in water or soil up to 50°C for up to 1 year

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 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 sensor operate?

This sensor operates in indoor, outdoor and underwater environments.

What measurements does this sensor support?

The RXW-TMB-921 sensor supports the following measurements: Air Temperature, Soil Temperature, Temperature and Water Temperature

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.

Temperature Measurement Range

-40°C to 100°C

Temperature Accuracy

±0.25°C from -40° to 0°C
±0.20°C from 0° to 70°C
±0.25°C from 70° to 100°C

Temperature Resolution

0.02°C

Temperature Drift

<0.01°C per year

Temperature Response Time (typical, to 90% of change)

Without solar radiation shield: 2 minutes, 30 seconds in air moving 1 m/sec
With RS3-B solar radiation shield: 5 minutes in air moving 1 m/sec

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 HOBOnet wireless sensor network

Battery Type

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: 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

Dimensions

Sensor: 45.97 x 11.43 x 10.16 mm
Mote: 16.2 x 8.59 x 4.14 cm

Weight

223 g

Materials

Sensor: Polyamide
Mote: PCPBT, silicone rubber seal

Environmental Rating

Sensor and cable: Immersion in water up to 50°C for 1 year
Mote: IP67, NEMA 6

Data Sheet

Download

Manual

Download

Quick Start Guide

Download