Onset RXW-THC-900 Operating Manual

HOBO® RX Wireless Sensor Network

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O

RXW Temperature/RH Sensor (RXW-THC-xxx) Manual

This sensor measures temperature and RH and is designed to work with the HOBOnet Wireless
Sensor Network in which data is transmitted wirelessly from the sensor mote across the
network to the RX3000 station and then uploaded to HOBOlink® web-based software. With
HOBOlink, you can monitor sensor readings, view graphs, set up alarms, download data, and
more.

Specifications

Sensor Temperature RH

Measurement Range -40°C to 75°C (-40°F to 167°F) 0–100% RH at -40° to 75°C (-40° to

RXW Temperature/
RH Sensor

Models:

• RXW-THC-900 (US)

• RXW-THC-868 (Europe)

• RXW-THC-922

(Australia/NZ)

Included Items:

• Cable ties

• Screws

Accessories:

• Solar radiation shield
(RS3-B)

Accuracy ±0.25°C from -40° to 0°C (±0.45°F

Resolution 0.02°C (0.036°F) 0.01% RH

Drift <0.01°C (0.018°F) per year <1% per year typical

Response Time (typical, to
90% of change)

ireless Mote

perating Temperature

Range

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

Modulation Employed OQPSK (Offset Quadrature Phase Shift Keying)

Data Rate Up to 250 kbps, non-adjustable

Duty Cycle <1%

Maximum Number of
Motes

Battery Type/
Power Source

Battery Life With NiMH batteries: Typical 3–5 years when operated in the

Memory 16 MB

Dimensions Sensor: 45.97 x 11.43 x 10.16 mm (1.81 x 0.45 x 0.40 inches)

from -40° to 32°F)
±0.20°C from 0° to 70°C (±0.36°F
from 32° to 158°F)

±0.25°C from 70° to 100°C (±0.45°F
from 158° to 212°F)

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

-25° to 60°C (-13° to 140°F) with rechargeable batteries

-40 to 70°C (-40 to 158°F) with lithium batteries

Reliable connection to 609.6 m (2,000 ft) line of sight at 3 m (10 ft) high

RXW-THC-900: 904–924 MHz
RXW-THC-868: 866.5 MHz
RXW-THC-922: 916–924 MHz

50 motes per one RX Wireless Sensor Network

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 (-40 to 158°F)

temperature range -20° to 40°C (-4°F to 104°F) 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

Cable length: 2 m (6.56 ft)
Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 inches)

167°F); exposure to conditions
below -20°C (-4°F) or above 95%
RH may temporarily increase the
maximum RH sensor error by an
additional 1%

±2.5% from 10% to 90% RH
typical to a maximum of ±3.5%
including hysteresis at 25°C
(77°F); below 10% and above
90% ±5% typical

5 minutes in air moving 1 m/sec
with protective cap

22242-A

RXW Temperature/RH Sensor (RXW-THC-xxx) Manual

C

Specifications (continued)

Weight Sensor and cable: 110 g (3.88 oz);

Materials Sensor: Polyamide

Environmental Rating Sensor: Weatherproof: 0 to 100% RH intermittent condensing

ompliance Marks RXW-THC-900: See last page

Mote Components and Operation

Mounting
Tab

Solar Panel

Sensor Cable

Sensor Mote Closed, Front Sensor Mote Closed, Back

Solar Panel Cable

Mounting Tab: Use the tabs at the top and bottom of the mote
to mount it (see Deploying and Mounting).

Solar Panel: Position the solar panel towards the sun to charge
the mote batteries (see Deploying and Mounting).

Sensor Cable: This is the cable that connects the mote to the
sensor.

Eyelet: Use this eyelet to attach a 3/16 inch padlock to the
mote for security.

Latch: Use the two latches to open and close the mote door.

Ground Wire Port: Use this port to connect a ground wire (see

Deploying and Mounting).

Latch

Eyelet

Ground Wire
Port

LEDs

Antenna

Button

USB Port

Battery Holder

Sensor Mote Opened

LCD Screen

Mote: 223 g (7.87 oz)

Mote: PCPBT, silicone rubber seal

environments. For best results, the sensor should be mounted inside a
protective enclosure, such as a solar radiation shield.
Mote: IP67, NEMA 6

RXW-THC-868: The CE Marking identifies this product as
complying with all relevant directives in the European Union
(EU).

RXW-THC-922: See last page

Antenna: This is the built-in antenna for the radio
communications across the RX Wireless Sensor Network.

Solar Panel Cable: This cable connects the built-in solar panel
to the mote circuitry.

LEDs: There are two LEDs to the left of the LCD screen. The
green LED blinks during the process of joining a network,
blinking quickly while the mote searches for a network and
then slowly as the mote registers with the network. Once the
network registration process is complete, the blue LED blinks at
4 seconds to indicate normal operation. If the mote is not
currently part of a network, the blue LED will be off. If the blue
LED is on and not blinking, there is a problem with the mote.
Contact Onset Technical Support.

Battery Holder: The location where the batteries are installed
as shown (see Battery Information).

USB Port: Use this port to connect to the mote to a computer
via USB cable if you need to update the firmware (see Updating

Mote Firmware).

Button: Push this button for 1 second to illuminate the LCD or 3

seconds for the mote to search for an RX Wireless Sensor
Network to join (see Adding the Mote to the RX Wireless Sensor
Network).

LCD Screen: The mote is equipped with an LCD screen that
displays details about the current status. This example shows all
symbols illuminated on the LCD screen followed by definitions
of each symbol in the table.

LCD Symbol Description

The battery indicator shows the approximate battery
charge remaining.

This is a signal strength indicator. The more bars, the
stronger the signal between motes. If there is no x
icon next to the signal strength indicator, then the
mote is part of an RX Wireless Sensor Network.

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