Onset RXW-LIB-900 Operating Manual

HOBO® RX Wireless Sensor Network

W

O

C

RXW Silicon Pyranometer Sensor (RXW-LIB-xxx) Manual

This sensor measures solar radiation 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

Measurement Range 0 to 1280 W/m2

Spectral Range 300 to 1100 nm (see Plot A)

RXW Silicon
Pyranometer Sensor

Models:

• RXW-LIB-900 (US)

• RXW-LIB-868 (Europe)

• RXW-LIB-922 (Australia/NZ)

Included Items:

• Cable ties

• Screws

Accessories:

• Light sensor mounting
bracket (M-LBB)

• Light sensor level (M-LLA)

Accuracy Typically within ±10 W/m2 or ±5%, whichever is greater in sunlight;

Angular Accuracy Cosine corrected 0 to 80 degrees from vertical (see Plot B); Azimuth

Resolution 1.25 W/m2

Drift <±2% per year

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: 4.1 cm height x 3.2 cm diameter (1.61 x 1.26 inches)

Weight Sensor and cable: 109 g (3.85 oz)

Materials Sensor: Anodized aluminum housing with acrylic diffuser and O-ring seal

Environmental Rating Sensor and cable: Weatherproof

ompliance Marks RXW-LIB-900: See last page

Additional temperature induced error ±0.38 W/m
(0.21 W/m

Error <±2% error at 45 degrees from vertical, 360 degree rotation

-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-LIB-900: 904–924 MHz
RXW-LIB-868: 866.5 MHz
RXW-LIB-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)

Mote: 223 g (7.87 oz)

Mote: PCPBT, silicone rubber seal

Mote: IP67, NEMA 6

2

/°F from 77°F)

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

RXW-LIB-922: See last page

2

/°C from 25°C

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RXW Silicon Pyranometer Sensor (RXW-LIB-xxx) Manual

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).

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).

Latch

Eyelet

Ground Wire
Port

LEDs

Antenna

Button

USB Port

Battery Holder

Sensor Mote Opened

LCD Screen

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.

An empty signal strength icon plus the x icon
indicates that the mote is not currently part of a
network. See Adding the Mote to the RX Wireless
Sensor Network for details on how to add a mote to
the network.

When the mote is in the process of joining a
network, the signal strength icon will blink and then
the bars in the icon will cycle from left to right. The x
icon will blink during the last step in the network
registration process (see Adding the Mote to the RX
Wireless Sensor Network for details).

This indicates a problem with the sensor itself (the
mote is operational). Check the sensor and make any
adjustments to it as needed. Contact Onset
Technical Support if the problem persists.

Spectral Characteristics

This sensor uses a silicon photodiode to measure solar power
per unit area (watts per square meter). Silicon photodiodes are
not ideal for use as solar radiation sensors and the photodiode
in this silicon pyranometer is no exception (see Plot A). An ideal
pyranometer has equal spectral response from 280 to 2800 nm.
However, when calibrated properly and used correctly, the
silicon pyranometer sensor should perform well in most
situations.

Sun's Relative Intensity and the Typical Relative Response of

the Silicon Pyranometer versus Wavelength

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

Sun's Relative Intensity

0.2

0.1

0.0

250 750 1250 1750 2250

Wavelength (nm)

Silicon Pyranometer
Sunlight

Plot A: Silicon Pyranometer Sensor Response Curve

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

Photodetector Relative Response

0.1

0.0

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RXW Silicon Pyranometer Sensor (RXW-LIB-xxx) Manual

The sensor is calibrated for use in sunlight (an Eppley Precision
Spectral Pyranometer is used as reference standard).
Accordingly, if the sensor is used under natural sunlight, the
measurement errors will be small. Note that significant errors
may result from using the sensor under artificial light, within
plant canopies, in greenhouses, or any other conditions where
the spectral content differs from sunlight.

Cosine Correction

The silicon pyranometer sensor housing is designed to give an
accurate cosine response. Plot B shows a plot of relative
intensity versus angle of incidence for a typical sensor and for
the theoretical ideal response. Deviation from ideal response is
less than 5% from 0 to 70 degrees and less than 10% from 70 to
80 degrees.

Note that as the angle approaches 90 degrees, the ideal cosine
response approaches zero. As a result, small errors in measured
intensity will result in very large percentage errors compared to
the ideal response from 80 to 90 degrees.

Typical Cosine Response of Silicon Pyranometer

120

100

80

60

40

Percent Relative Response

20

Ideal Response
Silicon Pyranometer

HOBO RXW Manager is installed in the left slot (module 1)
or twice if it is installed on the right slot (module 2).

Press this button to view the module
where the RXW Manager is installed

3. Press the Search button (the magnifying glass). The
magnifying glass icon will blink while the RX3000 is in search
mode.

Press this button so the station is ready
to have motes join the network

4. Open the mote door and install the batteries if you have not
already done so.

5. Press the button on the mote for 3 seconds. The signal
strength icon will flash and then cycle.

0

0 102030405060708090100

Plot B: Silicon Pyranometer Sensor Typical Cosine Response Curve

Angle from Vertical (Degrees)

Adding the Mote to the RX Wireless Sensor
Network

The mote must join an RX Wireless Sensor Network before it
can begin measuring solar radiation and transmitting data. This
requires accessing the RX3000 station and the mote at the
same time so it is recommended that you complete these steps
before deploying the mote.

Important: If you have not configured the RX3000 station with
the RXW Manager, follow the instructions in the RX3000 Quick
Start before continuing.

To add a mote to the RX Wireless Sensor Network:

1. If the LCD is blank on the RX3000 station, press any button
to wake it up.

2. Press the Select button once (which shows the number of
smart sensors installed) and then press it again once if the

Press this button for 3
seconds for the mote to
join the network

6. Watch the LCD on the mote.

a.

This signal strength icon
blinks while searching for
a network.

c.

This network connection
“x” icon blinks while the
mote completes the
registration process,
which may take up to
five minutes.

b.

Once a network is found,
the icon will stop flashing
and the bars will cycle from
left to right.

d.

Once the mote has finished joining
the network, the “x” icon is
removed and the channel count
on the station LCD increases by
two (one for solar radiation and
one for the mote battery).

This process may take up to five minutes. The green LED
blinks quickly while the mote searches for a network to join

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RXW Silicon Pyranometer Sensor (RXW-LIB-xxx) Manual

and then blinks slowly while it completes the network
registration. Once the mote has finished joining the
network, the green LED turns off and the blue LED then
blinks indefinitely while the mote is part of the network.

Note: If the mote cannot find the network or has trouble
remaining connected during this process, make sure the
mote is in a vertical, upright position and within range of
the station.

7. Press the Search button (the magnifying glass) on the
RX3000 station to stop searching for motes.

Press this button again to
stop searching for motes

If you added more than one more mote to the network, then
the total channel count on the RX3000 station LCD for the RXW
Manager module will represent all measurement channels plus
a battery channel for each mote in the RX Wireless Sensor
Network.

Sensor measurements will be recorded at the logging interval
specified in HOBOlink, transmitted to the RX3000 station, and
uploaded to HOBOlink at the next connection interval
(readout). Use HOBOlink to monitor mote status and health. If a
mote is temporarily offline, any logged data is saved until it is
back online. In addition, if a mote is offline for 30 minutes, the
RX3000 station will automatically connect to HOBOlink and
report the mote as missing. Once the mote is back online, any
logged data will be uploaded the next time the RX3000 station
connects to HOBOlink.

See the HOBOlink Help for details on how to change the logging
and connection intervals, view data, check mote status, add the
mote to a map, and more.

Deployment and Mounting

Mounting and Positioning the Mote

• Mount the mote to a mast or pipe using cable ties or affix
the mote to a wooden post or flat surface with screws.
Insert the cable ties or screws through the holes on the
mounting tabs.

• Consider using plastic poles such as PVC to mount the
mote as certain types of metal could decrease signal
strength.

• Make sure the mote remains in a vertical position once it is
placed in its deployment location for optimal network
communications.

• Make sure the mote door is closed, with both latches fully
locked to ensure a watertight seal.

• Consider using a 3/16 inch padlock to restrict access to the
mote. With the mote door closed, hook a padlock through
the eyelet on the right side of the door and lock it.

• Position the mote towards the sun, making sure the solar
panel is oriented so that it receives optimal sunlight
throughout each season. It may be necessary to
periodically adjust the mote position as the path of the
sunlight changes throughout the year or if tree and leaf
growth alters the amount of sunlight reaching the solar
panel.

• Make sure the mote is mounted a minimum of 1.8 m (6 ft)
from the ground or vegetation to help maximize distance
and signal strength.

• Place the mote so there is full line of sight with the next
mote. If there is an obstruction between two sensor
motes or between the sensor mote and the RXW
Manager, then use an RXW Repeater (RXW-RPTR-xxx). For
example, if there is a hill between the sensor mote and
the RXW Manager, place a repeater at the top of the hill
between the sensor mote and the RXW Manager.

• There should not be more than five motes in any direction
at their maximum transmission range from the RXW
Manager. Data logged by a wireless sensor must travel or
“hop” across the wireless network from one mote to the
next until it ultimately reaches the RXW Manager at the
RX3000 station. To make sure the data can successfully
travel across the network, the mote should not be more
than five hops away from the manager.

• The RX Wireless Sensor Network can support a maximum
of 50 motes.

• Use a #4-40 screw to attach a ground wire to the port on
the back of the mote if you are deploying the mote in a
location where lightning is a concern.

Mounting the Sensor with a Bracket

It is recommended that you mount the silicon pyranometer
sensor with the light sensor bracket (M-LBB) on a pole or
tripod. Use the light sensor level (M-LLA) to make sure it is level
on the bracket. To mount the sensor using the bracket:

5

1. Attach the light sensor bracket to a 1¼ inch - 1

with the provided U-bolts. Note: The bracket can also be
mounted on a flat, vertical surface using four screws.

2. Position the silicon pyranometer sensor on top of the
bracket with its cable running through the slot in the
bracket.

3. Using the two screws supplied, attach the sensor to the
bracket through the two holes on either side of the slot.
Note: Do not completely tighten the screws until you level
the sensor.

4. Position the bracket so it faces toward the equator,
minimizing the chance of shading.

5. Mount the bracket on the mast with the two U-bolt
assemblies, mounting it high enough on the mast to avoid the
possibility of shading the sensor. Note: If you mount the
sensor above eye level, it is recommended that you use a step
ladder or other secure platform when leveling the sensor so
that you can clearly view the light sensor level (M-LLA).

/8 inch pole

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RXW Silicon Pyranometer Sensor (RXW-LIB-xxx) Manual

Mast

Silicon pyranometer
sensor

Light sensor
bracket

Thumbscrew

Silicon pyranometer
sensor cable

U-bolt
assembly

Silicon Pyranometer Sensor Bracket Mounting

6. Make sure the screws holding the sensor to the mounting
bracket are loose.

7. Place the light sensor level on the silicon pyranometer
sensor.

8. Adjust the height of the thumbscrews to level the sensor
(start with the thumbscrews protruding about 1/16

inch

from the bracket).

9. Once the sensor is near level, tighten the Phillips head
screws.

10. Check the level and repeat above steps if necessary.

11. When the sensor is level, remove the light sensor level from
the sensor.

3. Attach the sensor using two 6-32 x 3/8 inch screws and lock
washers (not included).

4. Shim the sensor as necessary to level it.

Sensor Mounting Guidelines

• Small errors in alignment can produce significant errors.
Be certain that the sensor is mounted level.

• Mount the sensor where it will not be in a shadow. Any
obstruction should be below the plane of the sensor head.
If that is not possible, try to limit obstructions to below 5
degrees, where the effect will be minimal.

• If possible, avoid locating the sensors in dusty locations.
Dust, pollen, and salt residue that collect on the top of the
sensor can significantly degrade accuracy.

• Refer to the station manual and Tripod Setup Guide at
www.onsetcomp.com/support/manuals for more
information regarding setting up stations.

Sensor Operation

The silicon pyranometer sensor supports measurement
averaging at a fixed rate of once a minute. The multiple
samples are then averaged together and the average value is
recorded at the logging interval. For example, when the logging
interval is set at 10 minutes, each recorded data point will be
the average of 10 measurements (1 sample per minute for 10
minutes).

Light sensor level

Silicon
pyranometer
sensor

(remove for operation)

Leveling the Sensor on the Light Sensor Bracket

Mounting the Sensor on a Mounting Plate

To mount the silicon pyranometer sensor using a mounting
plate of your own design:

1. Drill a 0.56 (9/16) inch hole in the middle of the plate, then
drill two #25 holes 1.063 (1-1/16) inches apart on either
side of the center hole. Cut a 0.31 (5/16) inch-wide slot in
the mounting plate as shown. The plate should be a
thickness of 1/8 inch or less.

Maintenance

Dust on the sensor will degrade sensor accuracy. Periodically
inspect the sensor, and if necessary, gently clean the diffuser
with a damp sponge. Do not open the sensor as there are no
user serviceable parts inside.

Warning: DO NOT use alcohol, organic solvents, abrasives,

or strong detergents to clean the diffuser element on the
silicon pyranometer sensor. The acrylic material used in the
sensor can be crazed by exposure to alcohol or organic
solvents. Clean the sensor only with water and/or a mild
detergent such as dishwashing soap if necessary. It is
recommended that you use vinegar to remove hard water
deposits from the diffuser element. Under no circumstances
should the sensor be immersed in any liquid.

The mote is designed for outdoor use, but should be inspected
periodically. When inspecting the mote, do the following:

• Verify the mote is free of visible damage or cracks.

• Make sure the mote is clean. Wipe off any dust or grime

with a damp cloth.

• Wipe off any water before opening the mote.

• Make sure the interior seal is intact and the latches are

fully locked when the mote door is closed.

Verifying Sensor Accuracy

Recommended Mounting Plate Dimensions

2. Slide the sensor through the 0.31 (5/16) inch-wide slot.

1-800-LOGGERS 5 www.onsetcomp.com

It is recommended that you check the accuracy of the silicon
pyranometer sensor annually. The sensor cannot be calibrated.
Onset uses precision components to obtain accurate
measurements. If the sensor is not providing accurate data,
then it may be damaged.

RXW Silicon Pyranometer Sensor (RXW-LIB-xxx) Manual

Updating Mote Firmware

If a new firmware version is available for the mote, use
HOBOlink to download the file to your computer.

1. In HOBOlink, go to Devices > List and click your station
name.

2. On the station page, click Overview and scroll down to
Device Information.

3. Click the Wireless tab. This icon appears next to the
mote if there is a new version of firmware available.

4. Click the firmware upgrade link. Click Download and
save the firmware .bin file to your computer.

5. Connect the mote to the computer with a USB cable (open
the mote door and use the USB port to the right of the
LCD). The blue LED is illuminated while connected.

6. The mote appears as a new storage device in the
computer’s file storage manager. Copy the downloaded
firmware file to the new storage device (the mote). The
blue LED will blink slowly while the file is copying.

7. After the file is copied to the mote, the LED will stop
blinking and remain a steady blue. Eject the storage device
from the computer and disconnect the cable from the
mote. The firmware installation process will begin
automatically on the mote. The blue LED will blink rapidly
while the firmware is installed. Once the firmware
installation is complete, the LCD symbols return and the
mote will automatically rejoin the network.

Notes:

• Mac® users: A message may appear indicating the disk

has not ejected properly when disconnecting the mote
from the computer. The mote is operational and you can
ignore the message.

• If the blue LED turns off abruptly while copying the file or

installing the firmware, a problem has occurred. Contact
Onset Technical Support for help.

Battery Information

The mote uses two 1.2 V rechargeable NiMH batteries, charged
by the built-in solar panel. The quality and quantity of solar
light can affect whether the battery is sufficiently charged to
last through the night and cloudy periods. Make sure the mote
is placed in a location that will receive several hours of sunlight
each day. If the mote does not receive enough sunlight to
recharge the batteries, the battery life is estimated at 3–4
months. When batteries are regularly recharged, expected
battery life is estimated at 3–5 years. Battery life varies based
on the ambient temperature where the mote is deployed, the
logging interval, the number of tripped alarms, and other
factors. Deployments in extremely cold or hot temperatures
can impact battery life. Estimates are not guaranteed due to
uncertainties in initial battery conditions and operating
environment.

Mote operation will stop when battery voltage drops to 1.8 V.
Mote operation will return if the battery recharges to 2.3 V. If
the batteries are unable to be recharged, replace them with
fresh rechargeable batteries. Note: if you install used

rechargeable batteries that together are less than 2.3 V, the
mote will not resume operation.

To replace rechargeable batteries:

1. Open the mote door.

2. Remove the old batteries and install fresh ones observing
polarity.

3. Make sure the solar panel cable is plugged in.

Make sure
solar panel
cable is
installed
when using
rechargeable
batteries

The mote contacts the network once the new batteries are
installed. The green LED blinks quickly while the mote searches
for a network to join and then blinks slowly while it completes
the network registration. Once the mote has finished joining
the network, the green LED turns off and the blue LED then
blinks indefinitely while the mote is part of the network.

Lithium Batteries

You can use two 1.5 V lithium batteries (HWSB-LI) for operation
at the extreme ends of the mote operating range. Lithium
battery life is an estimated at 1 year, but varies based on the
ambient temperature where the mote is deployed, the logging
interval, the number of tripped alarms, and other factors.
Estimates are not guaranteed due to uncertainties in initial
battery conditions and operating environment. When using
lithium batteries, you must disconnect the solar panel cable
because the batteries will not be recharged.

To install lithium batteries:

1. Open the mote door.

2. Remove any old batteries and install the new ones
observing polarity.

3. Push in the side tab of the solar panel cable connector and
pull the connector out of the cable port.

4. Place the connector in the slot on the inside of the mote
door. Make sure the solar panel cables are tucked inside the
door so that they do not interfere with the interior seal
when the mote is closed.

Store the solar
panel connector
here when using
lithium batteries

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RXW Silicon Pyranometer Sensor (RXW-LIB-xxx) Manual

The mote contacts the network once the new batteries are
installed. The green LED blinks quickly while the mote searches
for a network to join and then blinks slowly while it completes
the network registration. Once the mote has finished joining
the network, the green LED turns off and the blue LED then
blinks indefinitely while the mote is part of the network.

WARNING: Do not cut open, incinerate, heat above 85°C

(185°F), or recharge the lithium batteries. The batteries may
explode if the mote is exposed to extreme heat or conditions
that could damage or destroy the battery cases. Do not mix
battery types, either by chemistry or age; batteries may rupture
or explode. Do not dispose of the logger or batteries in fire. Do
not expose the contents of the batteries to water. Dispose of
the batteries according to local regulations for lithium
batteries.

Federal Communication Commission Interference Statement

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one of the following measures:

• Reorient or relocate the receiving antenna

• Increase the separation between the equipment and receiver

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected

• Consult the dealer or an experienced radio/TV technician for help

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired operation.

FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment.

Industry Canada Statements

This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and
(2) this device must accept any interference, including interference that may cause undesired operation of the device.

Avis de conformité pour l’Industrie Canada

Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1)
l'appareil ne doit pas produire de brouillage, et (2) l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le
fonctionnement.

To comply with FCC and Industry Canada RF radiation exposure limits for general population, the logger must be installed to provide a separation distance of at least 20cm from
all persons and must not be co-located or operating in conjunction with any other antenna or transmitter.

1-800-LOGGERS (564-4377) • 508-759-9500
www.onsetcomp.com/support/contact

© 2018 Onset Computer Corporation. All rights reserved. Onset, HOBO, and HOBOlink are registered
trademarks of Onset Computer Corporation. Mac is a registered trademark of Apple Inc. All other
trademarks are the property of their respective companies.

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