Onset Computer ONST6 HOBO RX Wireless Sensor Network User Manual 22241 2 RXW SMx Manual

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Document ID	4117111
Application ID	H8ElLAg2A8yPN4tQGES17w==
Document Description	User Manual_22241-2 RXW-SMx Manual.pdf
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Date Submitted	2018-12-26 00:00:00
Date Available	2018-12-26 00:00:00
Creation Date	2018-02-16 10:00:04
Producing Software	Acrobat Distiller 10.1.16 (Windows)
Document Lastmod	2018-02-16 10:01:14
Document Title	RXW EC-5 or 10H Soil Moisture Sensor (RXW-SMx-xxx) Manual
Document Creator	PScript5.dll Version 5.2.2
Document Author:	Onset Computer Corporation

HOBO® RX Wireless Sensor Network
RXW EC-5 or 10H Soil Moisture Sensor (RXW-SMx-xxx) Manual
This sensor measures soil moisture and is designed to work with the HOBO RX 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
RXW 10H model shown
RXW-SMC-xxx
In soil: 0 to 0.550 m³/m³ (volumetric In soil: 0 to 0.570 m³/m³ (volumetric
water content)
water content)
Extended Range
-0.401 to 2.574 m³/m³; see Note 1
-0.659 to 0.6026 m³/m³; see Note 1
Accuracy
±0.031 m³/m³ (±3.1%) typical 0 to
50°C (32° to 122°F) for mineral
soils up to 8 dS/m and ±0.020
m³/m³ (±2%) with soil specific
calibration; see Notes 2 and 3
±0.033 m³/m³ (±3.3%) typical 0 to
50°C (32° to 122°F) for mineral soils
up to 10 dS/m and ±0.020 m³/m³
(±2%) with soil specific calibration;
see Notes 4 and 5
Resolution
0.0007 m³/m³ (0.07%)
0.0008 m³/m³ (0.08%)
Volume of Influence
0.3 liters (10.14 oz)
1 liter (33.81 oz)
Sensor Frequency
70 MHz
70 MHz
METER ECH2O Probe Part
No.
EC-5
10HS
Sensor Operating
Temperature Range
0° to 50°C (32° to 122°F). Although
the sensor probe and cable can
safely operate at below-freezing
temperatures (to -40°C/F), the soil
moisture data collected at these
extreme temperatures is outside
of the sensor’s accurate
measurement range.
0° to 50°C (32° to 122°F). Although
the sensor probe and cable can
safely operate at below-freezing
temperatures (to -40°C/F), the soil
moisture data collected at these
extreme temperatures is outside of
the sensor’s accurate measurement
range. Extended temperatures
above 50°C (122°F) will decrease
mote battery life.
RXW EC-5 or 10H Soil
Moisture Sensor
Models:
• RXW-SMC-900 and
RXW-SMD-900 (US)
• RXW-SMC-868 and
RXW-SMC-868 (Europe)
• RXW-SMC-922 and
RXW-SMD-922
(Australia/NZ)
Items included:
RXW-SMD-xxx
Measurement Range
• Protective cap
• Cable ties
Wireless Mote
22241-2
Operating Temperature
Range
-25° to 60°C (-13° to 140°F) with rechargeable batteries
-40 to 70°C (-40 to 158°F) with lithium batteries
Radio Power
12.6 mW (+11 dBm) non-adjustable
Transmission Range
At least 304.8 m (1,000 ft) line of sight at 1.8 m (6 ft) from the ground,
457.2 m (1,500 ft) typical
Wireless Data Standard
IEEE 802.15.4
Radio Operating
Frequencies
RXW-SMC-900 and RXW-SMD-900: 904–924 MHz
RXW-SMC-868 and RXW-SMD-868: 866.5 MHz
RXW-SMC-922 and RXW-SMD-922: 916–924 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 (-40
to 158°F)
Battery Life
With NiMH batteries: Typical 3–5 years when operated in the 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
RXW EC-5 and 10H Soil Moisture Sensor (RXW-SMx-xxx) Manual
Specifications (continued)
Dimensions
RXW-SMC-xxx soil probe: 89 x 15 x 1.5 mm (3.5 x 0.62 x 0.06 in.)
RXW-SMD-xxx soil probe: 160 x 32 x 2 mm (6.5 x 1.25 x 0.08 in.)
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-SMC-xxx sensor and cable: 180 grams (6.3 oz)
RXW-SMD-xxx sensor and cable: 190 grams (6.7 oz)
Mote: 223 g (7.87 oz)
Materials
Sensor: Weatherproof
Mote: PCPBT, silicone rubber seal
Environmental Rating
Mote: IP67
Compliance Marks
RXW-SMC-900 and RXW-SMD-900: See last page
RXW-SMC-868 and RXW-SMD-868: The CE Marking identifies this
product as complying with all relevant directives in the European
Union (EU).
RXW-SMC-922 and RXW-SMD-922: See last page
Note 1: (RXW-SMC-xxx and RXW-SMD-xxx) The sensor is capable of providing readings outside the standard volumetric
water content range. This is helpful in diagnosing sensor operation and installation. See the Sensor Operation
section for more details.
Note 2: (RXW-SMC-xxx) This is a system level accuracy specification and is comprised of the probe’s accuracy of ±0.03
m³/m³ typical (±0.02 m³/m³ soil specific) plus the mote accuracy of ±0.001 m³/m³ at 25°C (77°F). There are
additional temperature accuracy deviations of ±0.003 m³/m³ / °C maximum for the probe across operating
temperature environment, typical <0.001 m³/m³ / °C. (The temperature dependence of the mote is negligible.)
Note 3: (RXW-SMC-xxx) Given the nature of the sensor design and sensor operating frequency, the system has inherent
susceptibilities to Radio Frequency signals. The accuracy specification when subjected to certain RFI
environments, such as those outlined in IEC 61000-4-3 and IEC 61000-4-6, is reduced to 0.061 m³/m³.
The system level accuracy will be particularly affected when placed in an electric field of 3 V/m or greater in the
70 MHz range. RFI mitigation practices and physical deployment changes may reduce the systems susceptibility.
Note 4: (RXW-SMD-xxx) This is a system level accuracy specification and is comprised of the probe’s accuracy of ±0.03
m³/m³ typical (±0.02 m³/m³ soil specific) plus the mote accuracy of ±0.003 m³/m³ at 25°C (77°F). There are
additional temperature accuracy deviations of ±0.003 m³/m³ / °C maximum for the probe across operating
temperature environment, typical <0.001 m³/m³ / °C. (The temperature dependence of the mote is negligible.)
Note 5: (RXW-SMD-xxx): Given the nature of the sensor design and sensor operating frequency, the system has inherent
susceptibilities to Radio Frequency signals. The accuracy specification when subjected to certain RFI
environments, such as those outlined in IEC 61000-4-3 and IEC 61000-4-6, may be significantly reduced.
The system level accuracy will be particularly affected when placed in an electric field of 3 V/m or greater in the
150 KHz to 1000 MHz range. RFI mitigation practices and physical deployment changes may reduce the systems
susceptibility, however will yield reduced system accuracy. If deployments are planned in high RFI energy
environments, Onset recommends on-site testing to determine system level accuracy.
Mote Components and Operation
Solar Panel Cable
LED
Antenna
Mounting
Tab
LCD Screen
Solar Panel
Latch
Button
Eyelet
LED
USB Port
Battery Holder
Ground Wire
Port
Sensor Mote Opened
Sensor Cable
Sensor Mote Closed, Front
Mounting Tab: Use the tabs at the top and bottom of the mote
to mount it (see Deploying and Mounting).
Sensor Mote Closed, Back
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.
1-800-LOGGERS
www.onsetcomp.com
RXW EC-5 and 10H Soil Moisture Sensor (RXW-SMx-xxx) Manual
Eyelet: Use this eyelet to attach a 3/16 inch padlock to the
mote for security.
Sensor Operation
The soil moisture sensor measures the dielectric constant of
soil in order to determine its volumetric water content. The
dielectric constant of water is much higher than that of air or
soil minerals, which makes it a sensitive measure of the water
content. During operation, values of 0 to 0.5 m3/m3 are
possible. A value of 0 to 0.1 m3/m3 indicates oven-dry to dry
soil respectively. A value of 0.3 or higher normally indicates a
wet to saturated soil. Values outside the operating range may
be a sign that the sensor is not properly installed (poor soil
contact or foreign objects are adjacent to the sensor) or that a
soil-specific calibration is required. Note that sudden changes in
value typically indicate that the soil has settled or shifted,
which are signs that the sensor may not be installed properly or
that it has been altered or adjusted during deployment.
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: The blue LED to the left of the LCD screen blinks at 4
seconds during normal operation. It blinks more frequently
when initially joining a network. If the mote is not currently
part of a network, the blue LED will be off. If the LED is on and
not blinking, there is a problem with the mote. Contact
Technical Support at www.onsetcomp.com/support/contact.
The yellow-green LED to the upper right of the batteries only
blinks during the process of joining a network.
Battery Holder: The location where the rechargeable AA
batteries are installed as shown (see Battery Information).
The soil moisture sensor provides accurate readings for soil
between 0 and 50°C (32° and 122°F). The sensor will not be
damaged by temperatures as low as -40°C (-40°F); it is safe to
leave the sensor in the ground year-round for permanent
installation. Readings outside the sensor frequency range may
result in errors in HOBOlink.
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).
Adding the Mote to the RX Wireless Sensor
Network
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).
The mote must join an RX Wireless Sensor Network before it
can begin measuring soil moisture 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.
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.
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.
LCD Symbol
2. Press the Select button once (which shows the number of
smart sensors installed) and then press it again once if the
HOBO RXW Manager is installed in the left slot (module 1)
or twice if it is installed on the right slot (module 2).
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. This icon
will blink when you press the button on the mote
to search for a network to join (see Adding the
Mote to the RX Wireless Sensor Network for
details).
This indicates that the mote is not 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.
Press this button to view the module
where the RXW Manager is installed
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.
1-800-LOGGERS
www.onsetcomp.com
RXW EC-5 and 10H Soil Moisture Sensor (RXW-SMx-xxx) Manual
3. Press the Search button (the magnifying glass). The
magnifying glass icon will blink while the RX3000 is in search
mode.
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
• Use cable ties to mount the mote via the holes on the
mounting tabs.
Press this button so the station is ready
to have motes join the network
• Avoid mounting the mote near metal, which can cause
interference with the signal.
4. Open the mote door and install the batteries if you have not
already done so.
• 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.
5. Press the button on the mote for 3 seconds. The signal
strength icon will flash and then cycle.
• Make sure the mote door is closed, with both latches fully
locked to ensure a watertight seal.
Press this button for 3
seconds for the mote to
join the network
• 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.
6. Watch the LCD on the mote. The signal strength icon and
the LEDs will quickly blink while the mote searches for the
wireless network. Once it has found the network, the icon
will stop blinking and the signal strength bars will slowly
cycle from left to right. As the mote completes its
registration process with the network, the “x” icon to the
right of the signal strength icon will flash and the yellowgreen LED will stop blinking. Once the registration is
complete, the signal strength bars will stop cycling and
remain solid and the channel count on the RX3000 LCD will
be updated. This process may take up to five minutes. Note:
The channel count on the LCD will increase by 2: one for soil
moisture and one for the mote battery.
• To maximize the communication between motes, place
the mote within 304.8–457.2 m (1,000–1,500 feet) and full
line of sight with the next mote in the network and at least
1.8 m (6 feet) from the ground.
• 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) mounted higher than
the two motes. For example, if there is a hill or mountain
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
from a repeater or 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 sensor mote should not be more than five hops away
from a repeater or manager.
7. Press the Search button (the magnifying glass) on the
RX3000 Station to stop searching for motes.
• 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.
Press this button again to
stop searching for motes
• Make sure the mote remains in a vertical position once it
is placed in its deployment location for optimal network
communications.
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
1-800-LOGGERS
Sensor Installation Guidelines
This sensor measures the water content in the space
immediately adjacent to the probe surface. Air gaps or
excessive soil compaction around the probe can profoundly
www.onsetcomp.com
RXW EC-5 and 10H Soil Moisture Sensor (RXW-SMx-xxx) Manual
• Make sure the mote is clean. Wipe off any dust or grime
with a damp cloth.
influence soil water content readings. Do not mount the probes
adjacent to large metal objects, such as metal poles or stakes.
Maintain at least 8 cm (3 inches) of separation between the
probe and other objects. Any objects, other than soil, within 8
cm (3 inches) of the probe can influence the probe’s
electromagnetic field and adversely affect output readings. The
RXW-SMC sensor must be installed at least 3 cm (1.18 inches)
from the surface and the RXW-SMD sensor must be installed at
least 10 cm (3.94 inches) from the surface to obtain accurate
readings.
• 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.
Calibration
The soil moisture sensor comes pre-calibrated for most soil
types. If, however, your soil type has high sand or salt content,
the standard calibration will not be accurate. In such cases, you
will need to convert the data provided by the probe with a
specific calibration for your individual soil type. To determine
the soil specific calibration formula, refer to the Calibrating
ECH2O Soil Moisture Probes application note, available at
http://www.onsetcomp.com/support/tech-notes/calibratingech2o-soil-moisture-sensors-application-note.
It is important to consider the particle size of the medium in
which you are inserting the sensor because it is possible for
sticks, tree bark, roots, or other materials to get stuck between
the sensor prongs, which will adversely affect readings. Be
careful when inserting these sensors into dense soil as the
prongs can break if excessive sideways force is used to push
them into the soil.
Updating Mote Firmware
To install the soil moisture sensors, follow these guidelines:
If a new firmware version is available for the mote, use
HOBOlink to download the file to your computer. 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 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). After the file is copied, eject the storage device
from the computer and disconnect the cable from the mote.
The file will be installed automatically on the mote. Note to
Mac® users: A message may appear indicating the disk has not
ejected properly. The mote is operational and you can ignore
the message.
• Good soil contact with the sensor probes is required.
• Install the sensor probes into undisturbed soil where there
aren’t any pebbles in the way of the probes.
• Use a soil auger to make a hole to the desired depth (an
angled hole is best) and push the probes into undisturbed
soil at the bottom of the hole. Alternatively, dig a hole and
push the probes into the side of the hole.
• If the probe has a protective cap on the end, remove it
before placing the probe into the hole.
• To push the probe into the soil, use a PVC pipe with slots
for the sensor and a longer slot for the cable.
Battery Information
• Thoroughly water the soil around the sensor after it is
installed with the hole partially backfilled to cause the soil
to settle around the sensor.
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.
• As the hole is back-filled, try to pack the soil to the same
density as the undisturbed soil.
• Secure the sensor cable to the mounting pole or tripod
with cable ties.
• Use conduit to protect the cable against damage from
animals, lawn mowers, exposure to chemicals, etc.
If you need to calibrate your probe for the soil, you may want
to gather soil samples from each sample depth at this time.
When removing the probe from the soil, do not pull it out of
the soil by the cable! Doing so may break internal connections
and make the probe unusable.
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.
Maintenance
The soil moisture sensor does not require any regular
maintenance. If cleaning, rinse the sensor with mild soap and
fresh water.
To replace rechargeable batteries:
1. Open the mote door.
The mote is designed for outdoor use, but should be inspected
periodically. When inspecting the mote, do the following:
2. Remove the old batteries and install the new ones
observing polarity.
• Verify the mote is free of visible damage or cracks.
1-800-LOGGERS
www.onsetcomp.com
RXW EC-5 and 10H Soil Moisture Sensor (RXW-SMx-xxx) Manual
3. Make sure the solar panel cable is plugged in.
Make sure
solar panel
cable is
installed
when using
rechargeable
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.
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
WARNING: Do not cut open, incinerate, heat above 85°C
(185°F), or recharge the batteries. The batteries may explode if
the logger 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.
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.
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. ECH2O is a registered trademark of METER Group, Inc. Mac is a
registered trademark of Apple Inc. All other trademarks are the property of their respective companies.
22241-2

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