HOBO® Pendant® Event Data Logger (UA-003-64) Manual
T
The HOBO Pendant Event/Temp Data Logger is a rugged, weatherproof event logger with a 10bit temperature sensor. It is ideal for use with tipping-bucket rain gauges, and can record tens
of thousands of measurements and events. The logger uses a coupler and optical base station
with USB interface for launching and data readout by a computer.
Specifications
External Event Input
Event Sensor Two-wire interface suitable for measuring mechanical and electrical contact
Maximum Input
Frequency
Lockout Time 500 ms
Minimum Pulse Width 1 ms (hardware debounce)
Input/Output Impedance 100 kΩ
HOBO Pendant Event
Data Logger
Edge Detection Falling edge, contact closure, or Schmitt-trigger buffer
Preferred Switch Type Normally open. For maximum battery life, the event input should be used
Model: UA-003-64
Included Items:
• Tie wraps
• Adhesive mount
Open Circuit Input
Voltage
Maximum Input Voltage Battery voltage + 0.3 V
User Connection 24 AWG, 2 leads: white (+), black (-)
Required Items:
• HOBOware 2.x or later (go to
www.onsetcomp.com/
hoboware-free-download)
• USB cable
• Pendant Optic USB Base
Station & Coupler (BASE-U-1)
• Optic USB Base Station
(BASE-U-4) or HOBO
Waterproof Shuttle
(U-DTW-1) & Coupler
(COUPLER2-A)
emperature Measurement
Measurement Range
Accuracy
Resolution
Drift
Response Time Airflow of 2 m/s (4.4 mph): 10 minutes, typical to 90%
Logger
Time Accuracy ±1 minute per month at 25°C (77°F), see Plot B
Operating Range -20° to 70°C (-4° to 158°F)
Environmental Rating Tested to NEMA 6 and IP67; suitable for deployment outdoors
Drop Specification 1.5 m (5 ft) onto concrete
NIST Traceable
Certification
Battery CR-2032 3V lithium battery; 1 year typical use
Memory 64K bytes; see Data Storage.
Materials Polypropylene case; stainless steel screws; Buna-N o-ring; PVC cable
Weight 50 g (1.7 oz.)
Dimensions 71 x 33 x 23 mm (2.8 x 1.3 x 0.9 inches); 1.8 m (6 ft) cable
closures
1 Hz (1 pulse per second)
with its preferred switch type. The logger will work with normally closed
switches, but battery life will be compromised.
Battery voltage; nominally 3.0 V
-20° to 70°C (-4° to 158°F)
±0.53°C from 0° to 50°C (±0.95°F from 32° to 122°F), see Plot A. A solar
radiation shield is required for accurate temperature measurements in
sunlight.
0.14°C at 25°C (0.25°F at 77°F), see Plot A
Less than 0.1°C/year (0.2°F/year)
Available for temperature only at additional charge; temperature range
-20° to 70°C (-4° to 158°F)
insulation
The CE Marking identifies this product as complying with all relevant
directives in the European Union (EU).
9831-I MAN-UA-003
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HOBO Pendant Event Data Logger (UA-003) Manual
Specifications (continued)
Plot A Plot B
Connecting the Logger to a Computer
The HOBO Pendant logger requires either of the following to
connect to the computer:
• Pendant Optic USB Base Station & Coupler (BASE-U-1);
HOBOware 2.1 or later
OR
• Optic USB Base Station (BASE-U-4) or HOBO Waterproof
Shuttle (U-DTW-1); coupler (COUPLER2A); HOBOware 2.2 or
later
If possible, avoid connecting at temperatures below 0°C (32°F)
or above 50°C (122°F).
1. Plug the USB connector on the base station into an available
USB port on your computer.
2. Insert the logger and the base station into the coupler, as
shown in the following diagrams.
For BASE-U-1, make sure that the logger is inserted in the
end of the coupler that has the magnet, and that the ridges
on the base station and logger are aligned with the grooves
in the coupler.
BASE-U-1 & COUPLER
Ridge
For BASE-U-4 or the HOBO Waterproof Shuttle, firmly insert
the optical end of the base station into the D-shaped end of
the coupler, and make sure that the ridge on the logger is
aligned with the groove in the coupler.
To BASE-U-4 or
HOBO Waterproof Shuttle
COUPLER2-A
Coupler lever (for use with
HOBO Waterproof Shuttle)
Optical
communication
window
LOGGER
Ridge side down
3. If you are using the HOBO Waterproof Shuttle, briefly press
the coupler lever to put the shuttle into base station mode.
4. If the logger has never been connected to the computer
before, it may take a few seconds for the new hardware to
be detected.
5. Use the logger software to set up the alarms, launch, and
read out the logger.
You can read out the logger or check its status while it
continues to log, stop it manually with the software, or let it
record data until the memory is full. Refer to the software
user’s guide for complete details on launching, reading out, and
viewing data from the logger.
LOGGER
Magnet
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Important: Do not cover the optical communication window in
the logger (shown in diagram above) with a label or sticker as
that may interfere with the communications with the base
station or shuttle.
Connecting to a Tipping-Bucket Rain Gauge
The logger’s black and white input wires can be connected
directly to the relay output of most tipping-bucket rain gauges.
(Polarity of the input connection is not important.) If your
gauge came with a counter display and battery, disconnect
HOBO Pendant Event Data Logger (UA-003) Manual
these and attach the HOBO Pendant Event/Temp logger
instead.
Be careful not to touch the logger’s input wires together when
connecting or disconnecting the logger while it is logging, as
this will record a false event.
Triggered Start
This logger can be configured to start at your command, using
the magnet in the coupler to trigger a start.
1. Use HOBOware to launch the logger with Using Coupler
selected. Remove the logger from the coupler.
2. Bring the logger and an empty coupler or strong magnet to
the deployment location.
Important: Any magnet can trigger a start. This can be helpful,
but it can also cause a premature start. Keep the logger away
from strong magnetic fields until you are ready to begin
logging.
3. When you are ready for the logger to start logging (for
example, after connecting the logger to an external device
such as a rain gauge), insert the logger into the empty
coupler (or place it next to a strong magnet) and remove it
after three seconds.
Important: The logger will not launch if the base station is in
the coupler.
4. Verify that the logger’s light is blinking at least every four
seconds.
Event Logging
The external event channel records the times of transitions
from an open contact to a closed contact. The logger checks
continuously for transitions. When a transition occurs, it is
recorded as an event with a resolution of one second.
The external event channel has a built-in lockout time of 500
milliseconds. The lockout time serves to debounce mechanical
switches. To guarantee event capture, the pulse must have a
minimum duration of 1 millisecond.
Important: If the logger is configured to log events only (no
temperature or battery logging), there may be a delay of up to
an hour before logging begins or when relaunching. Keep this
delay in mind for deployment purposes. Deploy the logger or
relaunch it at a time when you will not need any data for an
hour.
In addition, if at least one channel is enabled for logging (either
temperature or battery) and you are relaunching the logger
with the HOBO Waterproof Shuttle, the logger will use the
logging interval to determine when to relaunch. For example,
let’s say the logging interval was set to 3 hours and only the
battery channel was selected for logging. When the logger is
read out and relaunched with the shuttle, logging—including
event logging—will not begin for three hours (the previously
selected logging interval). If you want to log temperature data,
it is recommended that you use a shorter logging interval to
minimize the delay when relaunching with a logger. It is not
necessary to log battery data; it is recommended that you
disable that channel.
Like other U-Series loggers, this logger stores internal events
that are unrelated to the external event inputs. Internal events
are stored when the coupler is attached or detached, when the
battery drops below approximately 2.7V, when the battery rises
above 2.8V, when a host computer is connected, and when the
logger is stopped by a command from the host software.
Operation
A light (LED) on the front of the logger confirms logger
operation. The following table explains when the light blinks
during logger operation.
When: The light:
The logger is logging Blinks once every one to four seconds
The logger is awaiting a start
because it was configured to
start logging At Interval, On
Date/Time, or Using Coupler
(the shorter the logging interval, the
faster the light blinks); blinks when
logging a sample
Blinks once every eight seconds until
logging begins
Data Storage
The data logger has 64,000 bytes of nonvolatile data storage.
Data storage requirements per event are a function of enabled
channels and logging interval. When events are three to 12
days apart, 32 bits are required to record a single event (16,000
events). When events are less than 16 seconds apart, only 22
bits are required to record a single event (23,000 events). In
most cases, 25,000 to 30,000 data points (including events,
temperature, and/or battery measurements) can be logged. For
most rain bucket applications, battery life, not memory
capacity, will be the factor that limits deployment duration.
Protecting the Logger
Do not store the logger in the coupler. Remove the logger from
the coupler when you are not using it. When the logger is in the
coupler or near a magnet, it consumes more power and will
drain the battery prematurely.
Keep the logger away from magnets. Being near a magnet can
cause false coupler events to be logged. It can also launch the
logger prematurely if it was waiting for a trigger start.
If the logger is used in a humid location, periodically inspect the
desiccant and dry it if it is not bright blue. To dry the desiccant,
remove the desiccant pack and leave the pack in a warm, dry
location until the bright blue color is restored. (Refer to the
Battery section for instructions on removing and replacing the
logger cap.)
Temperature Range Desiccant Maintenance Schedule
Less than 30°C (86°F) Approximately once per year
30° to 40°C (86° to
104°F)
Over 40°C (104°F) Approximately every three months
Note! Static electricity may cause the logger to stop logging.
To avoid electrostatic discharge, transport the logger in an antistatic bag, and ground yourself by touching an unpainted metal
surface before handling the logger. For more information,
search for “static discharge” on www.onsetcomp.com.
Approximately every six months
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HOBO Pendant Event Data Logger (UA-003) Manual
Battery
The logger requires one 3-Volt CR-2032 lithium battery. Battery
life varies based on the temperature, the type of external
switch, and the frequency at which the logger is recording data
(the logging interval). A new battery typically lasts one year
with logging intervals greater than one minute. Deployments in
extremely cold or hot temperatures, or logging intervals faster
than one minute, may significantly reduce battery life.
Continuous logging at the fastest logging rate of one second will
deplete the battery in as little as two weeks.
Replacing the Battery
Before you begin: You will need a small Philips head
screwdriver and silicone-based O-ring grease, such as Parker
Super-O-Lube, to complete these steps (no petroleum-based
lubricants). The logger should be wiped clean and dried
completely before opening it.
To replace the battery:
1. Avoid electrostatic discharge while handling the logger and
internal circuit board; ground yourself by touching an
unpainted metal surface. Hold the circuit board by its edges
and avoid touching electronics.
2. Working on a clean, dry surface, remove the two screws
that secure the end cap to the case and remove the cap.
The circuit board is attached to the cap.
3. Examine the desiccant pack that is tucked below the battery
holder. If the desiccant is not bright blue, put the desiccant
pack in a warm, dry place until the blue color is restored.
Or, for faster drying, the desiccant can be dried for two
hours in a 70°C (160°F) oven.
Battery
Desiccant
7. Inspect the O-ring for cracks or cuts and replace it if any are
detected (the O-ring is included in this logger’s replacement
parts kit).
8. Using your fingers (not cloth or paper), spread a small dot of
silicone-based grease on the O-ring, just enough to moisten
it all the way around and making sure that the entire O-ring
surface is completely coated with grease. As you work the
grease into the O-ring, make sure there is no grit or debris
on the O-ring.
9. Feed the O-ring over the cable and grommet on to the end
cap, making sure it is fully seated and level in the groove.
Make sure the O-ring is not pinched or twisted and that no
dirt, lint, hair, or any debris is trapped on the O-ring.
10. Very slightly grease the inside rim of the case, especially
around the screw holes with the silicone grease, just
enough to moisten the inside edges. Make sure that there is
no excess lubricant that could get onto the logger
electronics or label. Make sure there is no debris on this
surface.
11. Return the circuit board, desiccant pack, and label to the
case, carefully aligning the circuit board with the grooves in
the case so that the battery faces the ridged side of the
case.
Grommet
O-ring on end cap
Circuit board
4. Carefully push the battery out of the holder with a small,
nonmetallic blunt instrument.
5. Insert a new battery, positive side facing up.
6. Remove the O-ring from the end cap. Use the thumb and
fingers of one hand to hold the cap and grommet, and use
the thumb and fingers on your other hand to slide the Oring to form a loop as shown in photo at right. Use this loop
to roll the O-ring off the cap and over the grommet (do not
slide it over the circuit board).
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12. Carefully push the end cap into the lubricated case until the
screw holes are aligned. Visually check that the O-ring forms
a uniform seal all around.
13. Re-fasten the screws. Tighten the screws until you feel
them hit the bottom of the screw holes, but not so tight
Logger case
that they distort the clear housing.
14. Make sure the grommet is still tight. If loose, hand-tighten it
and then tighten an additional half-turn with a 15 mm
wrench.
WARNING: Do not cut open, incinerate, heat above 85°C
(185°F), or recharge the lithium battery. The battery may
explode if the logger is exposed to extreme heat or conditions
that could damage or destroy the battery case. Do not dispose
of the logger or battery in fire. Do not expose the contents of
the battery to water. Dispose of the battery according to local
regulations for lithium batteries.
© 2009–2017 Onset Computer Corporation. All rights reserved. Onset, HOBO, Pendant, and HOBOware are trademarks or
registered trademarks of Onset Computer Corporation. All other trademarks are the property of their respective companies.
This product has been manufactured by Onset Computer Corporation and in compliance with Onset’s ISO 9001:2008 Quality
Management System.
Patent # 6,826,664 9831-I MAN-UA-003
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