Hobo UX90-002 Series User manual

HOBO® Light On/Off Data Logger (UX90-002x) Manual
The HOBO Light On/Off data logger monitors indoor light changes with an internal sensor.
Using HOBOware®, you can easily configure the logger to record light on and off conditions
making it ideal for building energy audits and light usage analysis. This compact data logger has
a built-in LCD screen for checking status, remaining battery level, and memory consumption.
You can also use the LCD screen to quickly calibrate the logger to the light level in your building
or you can set calibration to preset sensitivity thresholds with HOBOware. There are two
models of the HOBO Light On/Off data logger: the UX90-002 has 128 KB of memory while the
UX90-002M has 512 KB.
Specifications
Light Threshold > 65 lux
Light Type LED, CFL, fluorescent, HID, incandescent, natural
Memory Modes Wrap when full or stop when full
Start Modes Immediate, push button, date & time, or next interval
Stop Modes When memory full, push button, or date & time
Time Accuracy ±1 minute per month at 25°C (77°F) (see Plot A)
Power Source One 3V CR2032 lithium battery and USB cable
Battery Life 1 year typical use
Memory UX90-002: 128 KB (84,650 measurements, maximum)
UX90-002M: 512 KB (346,795 measurements, maximum)
Download Type USB 2.0 interface
Full Memory Download
Time
10 seconds for 128 KB; 30 seconds for 512 KB
Logger Operating Range Logging: -20° to 70°C (-4° to 158°F); 0 to 95% RH (non-condensing)
Launch/Readout: 0° to 50°C (32° to 122°F) per USB specification
LCD LCD is visible from: 0° to 50°C (32° to 122°F); the LCD may react slowly or
go blank in temperatures outside this range
Size 3.66 x 5.94 x 1.52 cm (1.44 x 2.34 x 0.6 in.)
Weight 23 g (0.81 oz)
Environmental Rating IP50
The CE Marking identifies this product as complying with all relevant
directives in the European Union (EU).
Plot A: Time Accuracy
HOBO Light On/Of
f
Data Logger
Models: UX90-002
UX90-002M
Included Items:
•Command™ strip
•Double-sided tape
•Hook & loop strap
Required Items:
•HOBOware 3.3 or later
•USB cable (included with
software)
Accessories:
•Light pipe (UX90-LIGHT-
PIPE-1)
•U-Shuttle (U-DT-1)
Office: Jl. Radin Inten II No. 62 Duren Sawit, Jakarta 13440 - Indonesia
Workshop: Jl. Pahlawan Revolusi No. 22B, Jakarta 13430 - Indonesia
Phone: [phone] (Hunting) Fax: [phone]
Mobile: [phone]
Fax: [phone]

Logger Components and Operation
Start/Stop Button: Press this button for 3 seconds to start or
stop logging data. This requires configuring the logger in
HOBOware with a push button start or stop (see Setting up the
Logger). You can also press this button for 1 second to record
an internal event (see Recording Internal Logger Events) or to
turn the LCD screen on if the option to turn off the LCD has
been enabled (see Setting up the Logger).
Battery Tray: Remove the battery tray (not visible in the
diagram) on the top of the logger to access the logger battery
(see Battery Information).
Calibration Button: Press this button to calibrate the logger for
the light you will be monitoring. See Calibrating the Light
Sensor for more details.
Light Sensor: This built-in sensor monitors light on and off
conditions.
Mounting Loops: Use the two mounting loops to mount the
logger with the hook-and-loop strap (see Mounting the Logger).
External Input Jack: This is not currently supported for this
model. Check onsetcomp.com for new sensors for this model in
the future.
USB Port: Use this port to connect the logger to the computer
or the HOBO U-Shuttle via USB cable (see Setting up the Logger
and Reading Out the Logger).
LCD Screen: This logger 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 following table.
LCD Symbol Description
The logger is waiting to be launched. Press and
hold the Start/Stop button for 3 seconds to launch
the logger.
The logger has been launched with a push button
stop enabled; press and hold the Start/Stop
button for 3 seconds to stop the logger. Note: If
you also launched the logger with a push button
start, this symbol will not appear on the display for
5 minutes.
The battery indicator shows the approximate
battery power remaining.
If the logger has been configured to stop logging
when memory fills, the memory bar indicates the
approximate space remaining in the logger to
record data. In this example, the logger memory is
almost full.
If the logger has been configured to never stop
logging (wrapping enabled), then a single block
will blink starting at the left and moving right over
time. Each block represents a segment of memory
where the data is being recorded. In this example,
the middle block is blinking.
The light is on.
The light is off.
The logger is currently logging.
The logger can be calibrated. See Calibrating the
Light Sensor for more details.
This shows the signal strength of the light being
monitored. In this example, the signal strength is
at full scale. See Calibrating the Light Sensor for
more details.
Time display when logger is logging:
This shows the total amount of time the light has
been on since logging began, ranging from
seconds to days. This example indicates the light
has been on for a total of 5 minutes and 38
seconds. The logger must be launched with the
LCD set to show “Time” for this symbol to display.
Time display when logger is stopped:
This indicates the logger has been configured to
start logging on a particular date/time. The display
will count down to the start date/time until
logging begins. In this example, 5 minutes and 38
seconds remain until logging will begin.
This shows the percentage of time the light has
been on since logging began. This example
indicates the light has been on for a total of 24%
of the time since logging began. The logger must
be launched with the LCD set to show “%” for this
symbol to display.
The logger has been stopped.
Notes:
•You can disable the LCD screen when logging. Select “Turn
LCD Off” when setting up the logger as described in the
next section. When this option is enabled, you can still
temporarily view the LCD screen by pushing the Start/Stop
button or Calibration button for 1 second. The LCD will
then remain on for 10 minutes.
Calibration Button
Start/Stop Button
USB Port
Mounting
Loop
External Input Jack (not currently
supported in this model)
Light Sensor
Battery Tray
Mounting
Loop
LCD Screen
Office: Jl. Radin Inten II No. 62 Duren Sawit, Jakarta 13440 - Indonesia
Workshop: Jl. Pahlawan Revolusi No. 22B, Jakarta 13430 - Indonesia
Phone: [phone] (Hunting) Fax: [phone]
Mobile: [phone]
Fax: [phone]

•When the logger has stopped logging, the LCD screen will
remain on until the logger is offloaded to a computer or
HOBO U-Shuttle (unless launched with the “Turn LCD Off”
option). Once the logger has been offloaded and
disconnected from the computer, the LCD will turn off
automatically after 2 hours. The LCD will turn back on the
next time the logger is connected to the computer.
Setting up the Logger
Use HOBOware to set up the logger, including configuring the
sensor and selecting the start and stop logging options.
1. Connect the logger and open the Launch Logger window. To
connect the logger to a computer, plug the small end of the
USB cable into the side of the logger and the large end into a
USB port on the computer. Click the Launch icon on the
HOBOware toolbar or select Launch from the Device menu.
Important: USB 2.0 specifications do not guarantee
operation outside the range of 0°C (32°F) to 50°C (122°F).
2. Configure the sensor. Type a label for the sensor if desired
and select the measurement type. The sensor can be
configured to log:
•State. This records how long an event lasts by storing the
date and time when the state of the signal changes (logic
state high to low or low to high). The logger checks every
second for a state change, but will only record a time-
stamped value when the state change occurs. One state
change to the next represents the event duration.
•Runtime. The logger checks the state of the line once
every second. At the end of each logging interval, the
logger records how many seconds the line was in the
logic low state.
3. Configure optional filters as necessary. Click the Filters
button to create additional filtered data series based on the
sensor configuration. Any filtered series will be
automatically available upon reading out the logger.
4. Choose a calibration method with the Advanced settings.
The default method is to calibrate the logger using the
calibrate button on the logger after it is launched. If you
need to specify the sensitivity used for calibration, then
click the Advanced button and select either a maximum or
minimum level. See Calibrating the Light Sensor for more
details.
5. Set the units to display on the LCD screen. Select either
Time or %.
6. If the logger is configured to record runtime, choose a
logging interval from 1 second to a maximum of 18 hours,
12 minutes, and 15 seconds.
7. Choose when to start logging:
•Now. Logging begins immediately.
•At Interval. Logging will begin at the next even interval
(available when logging runtime only).
•On Date/Time. Logging will begin at a date and time you
specify.
•Push Button. Logging will begin once you press the
Start/Stop logging button for 3 seconds.
8. Choose when to stop logging:
•When Memory Fills. Logging will end once the logger
memory is full.
•Never (Wrap When Full). The logger will continue
recording data indefinitely, with newest data overwriting
the oldest.
•Push Button. Logging will end once you press the
Start/Stop logging button for 3 seconds. Note that if you
also choose Push Button to start logging, then you will
not be able to stop logging until 5 minutes after logging
begins.
•Specific Stop Date. Logging will end at a date and time
you specify.
9. Choose whether to keep the LCD on or off. By default, the
LCD will always remain on while logging. If you select the
“Turn LCD off” checkbox, the LCD will not show the current
readings, status, or other information while the logger is
logging. You will, however, be able to temporarily turn the
LCD screen on by pressing the Start/Stop button for 1
second if you select this option.
10. Click the Start button to launch the logger. Disconnect the
logger from the computer and deploy it using the mounting
materials (see Mounting the Logger). After logging begins,
you can read out the logger at any time (see Reading Out
the Logger for details).
Determining Logging Duration
The logger’s storage capacity and logging duration depends on the
interval between light on/off state changes. The longer the
interval between the changes, the more memory is needed to
store each data point. The following table shows how memory
capacity is affected by the amount of time between light changes:
Time
Between
Events
Approximate
Total Data
Points
Approximate
Logging Duration
(1 Year Battery Life)
Logger Part
Number
1 to 15
seconds
84,650 23.51 hours to 14.7
days
UX90-002
346,795
4.01 to 60.21 days UX90-002M
16
seconds
to 4.25
minutes
63,488
11.76 to 187.38 days UX90-002
260,096
48.17 days to 2.1 years UX90-002M
Office: Jl. Radin Inten II No. 62 Duren Sawit, Jakarta 13440 - Indonesia
Workshop: Jl. Pahlawan Revolusi No. 22B, Jakarta 13430 - Indonesia
Phone: [phone] (Hunting) Fax: [phone]
Mobile: [phone]
Fax: [phone]

Time
Between
Events
Approximate
Total Data
Points
Approximate
Logging Duration
(1 Year Battery Life)
Logger Part
Number
4.26 to
68.25
minutes
50,790
150.49 days to 6.6 years UX90-002
208,077
1.69 years to 2.7
decades
UX90-002M
68.26
minutes
to 18.2
hours
42,325 5.5 years to 8.8 decades UX90-002
173,397 2.25 to 36.03 decades UX90-002M
Notes:
•Typical battery life is 1 year when state changes are at 1
minute or greater intervals.
•The logger can record battery voltage data in an additional
channel. This is disabled by default. Recording battery
voltage reduces storage capacity and is generally not used
except for troubleshooting.
Using the Logger with the Light Pipe
An optional fiber optic attachment or light pipe (UX90-LIGHT-
PIPE-1) is available for this logger. This attachment connects to
the back of the logger. To install it:
1. Locate the notch in the upper left corner next to the
mounting magnet.
2. Insert the black base of the attachment into the notch so
that the base clips onto the corner of the logger as shown
below.
Follow these guidelines when using a light pipe:
•Make sure the end of the light pipe is as close to the light
source as possible.
•Avoid 90-degree bends. The light pipe is flexible and can
be bent to gain access to hard-to-reach areas, but should
not have any sharp, 90-degree bends.
•Maximize the signal strength on the logger LCD screen
by adjusting the light pipe while looking at the signal
bars (see Calibrating the Light Sensor for more details
on signal strength).
•Be sure to secure the light pipe after the signal has been
optimized.
•Do not support the logger by the light pipe.
•Be sure that the pipe is seated all the way into the bracket
before deployment.
Calibrating the Light Sensor
Each time you place the logger in a new lighted environment,
you should calibrate it to the light level that you will be
monitoring. This ensures the logger is accurately determining
when the light changes between ON and OFF states. There are
two calibration methods available: auto-calibration (button
calibration) or preset calibration via HOBOware.
Auto-calibration is used to calibrate the ON and OFF threshold
of the logger to achieve reliable readings in an environment
where ambient conditions are unknown prior to deployment or
where logger light levels are variable. In the auto-calibration
process, the light is measured via a built-in analog-to-digital
converter and the resulting value is used to generate a
calibration threshold. Note: Auto-calibration (button
calibration) must be done at the location where the logger will
be deployed.
Preset values are used when light levels are known in advance
and deployment speed is critical.
The logger has a built-in hysteresis level of approximately
±12.5% to prevent the sensor from toggling between ON and
OFF when the light level is near the calibration threshold. This
plot shows how the logger handles hysteresis. The logger
interprets the signal, or light, as ON until it drops below the
lower level of the calibration threshold. Once it switches to off,
the signal will not switch back to ON until it bypasses the upper
limit of the calibration level.
When auto-calibrating from the logger (button calibrating):
1. After launching, deploy the logger near the light source to
be monitored and turn the light source on.
Notch on back of logger
Base of attachment
inserted into notch
Office: Jl. Radin Inten II No. 62 Duren Sawit, Jakarta 13440 - Indonesia
Workshop: Jl. Pahlawan Revolusi No. 22B, Jakarta 13430 - Indonesia
Phone: [phone] (Hunting) Fax: [phone]
Mobile: [phone]
Fax: [phone]

2. Press the Calibrate button for 1 second. The LCD screen will
display the signal strength of the light. The signal strength
should ideally be at least 3 bars. Orient the logger as
necessary to increase the signal strength.
3. Press the Calibrate button for 3 seconds while “HOLD”
appears on the LCD screen. Move your hand away from the
logger to prevent shadowing. The logger will count down to
the auto-calibration and then display either “PASS” or
“FAIL” after calibration is complete.
4. If the auto-calibration fails, point the sensor directly at the
light source and then repeat these steps.
If you cannot manipulate the light source, you can set the
calibration level in HOBOware. To do this:
1. Click the Advanced button in the Launch Logger window.
2. The lower the light level, the higher the sensitivity needs to
be to record changes between ON and OFF conditions.
Therefore:
•For rooms with low light levels, such as residential
environments, select “Set to maximum sensitivity,” which
has a threshold set to approximately 100 lux.
•For rooms with high light levels, such as retail
environments, select “Set to minimum sensitivity,” which
has a threshold set to approximately 500 lux.
Note: The sensor is sensitive to lights that emit high
amounts of infrared radiation like incandescent and
halogen bulbs. It is best to use auto-calibration when
possible when monitoring on/off conditions for lights with
high infrared radiation.
3. Click Save. Note that the selections will not take effect in
the logger until you launch it.
Reading Out the Logger
There are two options for reading out the logger: connect it to
the computer with a USB cable and read out it with HOBOware,
or connect it to a HOBO U-Shuttle (U-DT-1, firmware version
1.15m030 or higher) and then offload the data files from the
U-Shuttle to HOBOware. Refer to the HOBOware Help for
details.
Recording Internal Logger Events
The logger records the following internal events to help track
logger operation and status:
Internal Event Name Definition
Host Connected The logger was connected to the computer.
Started The Start/Stop button was pressed to begin
logging.
Stopped The logger received a command to stop
recording data (from HOBOware or by
pushing the Start/Stop button).
Internal Calibration The logger was calibrated via auto-
calibration (button calibration).
Host Calibration The logger was calibrated via HOBOware.
Calibration Failure Calibrating the logger has failed.
Button Up/Button
Down
The Start/Stop button was pressed for
1
second.
Safe Shutdown The battery level dropped below 2.5 V; the
logger performs a safe shutdown.
Mounting the Logger
There are several ways to mount the logger using the materials
included:
•Use the four built-in magnets on the back of the logger to
mount it to a magnetic surface.
•Attach the Command strip to the back of the logger to
mount it a wall or other flat surface.
•Use the double-sided tape to affix the logger to a surface.
•Insert the hook-and-loop strap through the mounting
loops on both sides of the logger to mount it to a curved
surface, such as a pipe or tubing.
Protecting the Logger
The logger is designed for indoor use and can be permanently
damaged by corrosion if it gets wet. Protect it from
condensation. If the message FAIL CLK appears on the LCD
screen, there was a failure with the internal logger clock
possibly due to condensation. Remove the battery immediately
and dry the circuit board.
Note: Static electricity may cause the logger to stop logging.
The logger has been tested to 8 KV, but avoid electrostatic
discharge by grounding yourself to protect the logger. For more
information, search for “static discharge” in the FAQ section on
onsetcomp.com.
Battery Information
The logger is installed with a 3V CR2032 battery (HRB-TEMP).
Expected battery life varies based on the ambient temperature
where the logger is deployed, the logging interval, the rate of
state changes, the frequency of offloading to the computer,
and battery performance. A new battery typically lasts 1 year
with a logging interval greater than 1 minute. Deployments in
extremely cold or hot temperatures or a logging interval faster
than 1 minute may reduce battery life. Estimates are not
guaranteed due to uncertainties in initial battery conditions and
operating environment.
Office: Jl. Radin Inten II No. 62 Duren Sawit, Jakarta 13440 - Indonesia
Workshop: Jl. Pahlawan Revolusi No. 22B, Jakarta 13430 - Indonesia
Phone: [phone] (Hunting) Fax: [phone]
Mobile: [phone]
Fax: [phone]

The logger can also be powered by the USB cable when the
remaining battery voltage is too low for it to continue logging.
Connect the logger to the computer, click the Readout button
on the toolbar, and save the data as prompted. Replace the
battery before launching the logger again.
To replace the battery:
1. Holding the logger with the LCD screen facing up, pull the
battery tray out of the logger housing.
2. Remove the old battery from the tray.
3. Place the new battery in the tray with the positive side
facing down.
4. With the LCD screen still facing up, slide the tray back into
the logger. The LCD should display “HOBO” briefly after
correctly installing the battery.
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.
HOBOware provides the option of recording the current battery
voltage at each logging interval, which is disabled by default.
Recording battery life at each logging interval takes up memory
and therefore reduces logging duration. It is recommended you
only record battery voltage for diagnostic purposes.
CR2032 battery being
placed in the tray,
positive side facing
down
Battery tray removed
from logger
Office: Jl. Radin Inten II No. 62 Duren Sawit, Jakarta 13440 - Indonesia
Workshop: Jl. Pahlawan Revolusi No. 22B, Jakarta 13430 - Indonesia
Phone: [phone] (Hunting) Fax: [phone]
Mobile: [phone]
Fax: [phone]