Hobo MX1101 User manual

HOBO® MX Temp/RH Data Logger (MX1101) Manual
17840-U
The HOBO MX Temp/RH data logger records and transmits temperature and relative humidity
(RH) in indoor environments with its integrated sensors. This Bluetooth® Low Energy (BLE)-
enabled logger is designed for wireless communication with a phone, tablet, or computer.
Using the HOBOconnect® app, you can easily configure the logger and then download logged
data to view or export for further analysis. The logger can calculate minimum, maximum,
average, and standard deviation statistics and can be configured to trip audible or visual alarms
at thresholds you specify. The logger also supports burst logging in which data is logged at a
different interval when sensor readings are above or below certain limits. This compact data
logger also has a built-in LCD screen to display the current temperature, relative humidity,
logging status, battery use, memory consumption, and more.
Specifications
Temperature Sensor
Range -20° to 70°C (-4° to 158°F)
Accuracy ±0.21°C from 0° to 50°C (±0.38°F from 32° to 122°F), see Plot A
Resolution 0.024°C at 25°C (0.04°F at 77°F), see Plot A
Drift <0.1°C (0.18°F) per year
RH Sensor*
Range 1% to 90% (non-condensing)
Accuracy ±2% from 20% to 80% typical to a maximum of ±4.5% including
hysteresis at 25°C (77°F); below 20% and above 80% ±6% typical
Resolution 0.01%
Drift <1% per year typical
Response Time
Temperature 7:30 minutes in air moving 1 m/s (2.2 mph)
RH 20 seconds to 90% in airflow of 1 m/s (2.2 mph)
Logger
Radio Power 1 mW (0 dBm)
Transmission Range Approximately 30.5 m (100 ft) line-of-sight
Wireless Data Standard Bluetooth Low Energy (Bluetooth Smart)
Logger Operating Range -20° to 70°C (-4° to 158°F); 0 to 95% RH (non-condensing)
Logging Rate 1 second to 18 hours
Logging Modes Fixed interval (normal, statistics) or burst
Memory Modes Overwrite when full or stop when full
Start Modes Immediate, push button, date and time, or next interval
Stop Modes When memory is full, push button, date and time, or after a set
logging period
Restart Mode Push button
Time Accuracy ±1 minute per month at 25°C (77°F), see Plot B
Battery Life 1 year, typical with logging interval of 1 minute. Faster logging and/or
statistics sampling intervals, entering burst logging mode, and
remaining connected with the app affects battery life. Excessive
readouts, audible alarms, and paging all affect battery life. Visual
alarms and other events can have a marginal effect on battery life.
Battery Type Two AAA 1.5 V alkaline batteries, user replaceable
Memory 128 KB (84,650 measurements, maximum)
Full Memory Download Time Approximately 60 seconds; may take longer the further the device is
from the logger
*Per RH sensor manufacturer data sheet
HOBO MX Temp/RH
Data Logger
Models: MX1101
MX1101-01 (Japan
and Korea)
Included Items:
•Command™ strip
•Double-sided tape
•Hook & loop strap
•Two AAA 1.5 V alkaline
batteries
Required Items:
•HOBOconnect app
•Mobile device with
Bluetooth and iOS,
iPadOS®, or Android™, or a
Windows computer with a
native BLE adapter or
supported BLE dongle

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Specifications (continued)
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 8.48 x 2.29 cm (1.44 x 3.34 x 0.9 in.)
Weight 56 g (1.98 oz)
Environmental Rating IP50
The CE Marking identifies this product as complying with all relevant
directives in the European Union (EU).
See last page
*Per RH sensor manufacturer data sheet
Logger Components and Operation
Start/Stop Button: Press this button for 3 seconds to start or
stop logging data, or to resume logging on the next even
logging interval. This requires configuring the logger in the app
with a push button start or stop, and with Allow Button Restart
selected (see Configuring the Logger). You can also press this
button for 1 second to record an internal event (see Logger
Events), to silence a beeping alarm (see Setting up Alarms), or
to turn the LCD screen on if the option to turn off the LCD has
been enabled (see Configuring the Logger).
Press both the Start/Stop button and the Alarm/Stats button
simultaneously for 3 seconds to reset a logger password.
Alarm/Stats Button: Press this button for 1 second to switch
between statistics, alarm readings, and the current sensor
readings as applicable or to silence a beeping alarm. Press this
button for 3 seconds to clear a visual alarm if the logger is
configured in the app to maintain the visual alarm until the
alarm button is pressed (see Setting up Alarms).
Mounting Loops: Use the two mounting loops (only one visible
in the diagram) to mount the logger with the hook-and-loop
strap (see Mounting the Logger).
Temperature Sensor: This sensor is located in the lower left
corner of the raised panel to the right of the LCD screen.
RH Sensor: This sensor is located behind the vented panel in
the logger case to the right of the LCD screen and the
temperature sensor.
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 table on the next page.
LCD Symbol Description
The logger is waiting to be started or restarted.
Press and hold the Start/Stop button for 3 seconds
to start the logger.
Plot A: Temperature
Accuracy and Resolution
Plot B: Time Accuracy
Alarm/Stats Button
Start/Stop Button
Mounting
Loop
LCD Screen
RH Sensor (behind panel)
Temperature
Sensor

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LCD Symbol Description
The logger has been started with push button stop
enabled; press and hold the Start/Stop button for
3 seconds to stop the logger.
The battery indicator shows the approximate
battery power remaining.
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. When first started, all five segments
in the bar are empty. In this example, the logger
memory is almost full (only one segment in the
memory bar is empty).
The logger has been configured to never stop
logging. The logger continues recording data
indefinitely, with newest data overwriting the
oldest data until the batteries die or the logger is
reconfigured. When first launched, all five
segments in the memory bar are empty. In this
example, the memory is full (all five segments are
filled in) and new data is now overwriting the
oldest data. This continues until the logger is
stopped or the battery runs out.
The logger is currently logging.
A sensor reading is above or below the high or low
alarm limit that you configured. Press and release
the Alarm/Stats button until the “alm” symbol
(described below) is displayed on the screen. This
symbol at left clears depending on how visual
alarms are configured in the app. If the visual
alarm is set to clear when the logger is
reconfigured, this symbol remains on the LCD until
the next time new configuration settings are
loaded onto the logger (see Configuring the
Logger). Otherwise, it clears when the sensor
reading is back within the alarm limits or by
pressing the Alarm/Stats button for 3 seconds.
A visual alarm is ready to be cleared. This appears
only if the app is configured to maintain the visual
alarm until the alarm button is pressed. Press the
Alarm/Stats button for 3 seconds to clear the
visual alarm. Note that you can silence an audible
alarm by pressing the Start/Stop button or
Alarm/Stats button for 1 second.
Press the Alarm/Stats button for 1 second to cycle
through the statistics configured to display and
then back to the current sensor reading (or to the
alarm value if applicable). The screen displays
these symbols at the bottom and shows the
maximum, minimum, average, and standard
deviation values most recently calculated by the
logger (if you have selected the fixed logging mode
in the app and have selected each statistic; see
Statistics Logging).
This is the farthest out-of-range sample displayed
during the logger deployment. Press the
Alarm/Stats button to view this reading. Press the
Alarm/Stats button again to cycle through any
statistics (defined above) and ultimately back to
the current sensor reading.
This is an example of a temperature reading.
Temperature units are determined by the settings
in the app. To switch between Celsius and
Fahrenheit, change the units in the app settings
(you must reconfigure the logger for units changes
to take effect).
LCD Symbol Description
This is an example of an RH reading.
The logger has been configured to start logging on
a particular date/time. The display counts down in
days, hours, minutes, and seconds until logging
begins. In this example, 5 minutes and 38 seconds
remain until logging begins.
The configured settings are being loaded onto the
logger from the app.
An error occurred while loading the configuration
settings onto the logger from the app. Try
reconfiguring the logger.
The logger has been stopped with the app or
because the memory is full.
Notes:
•You can disable the LCD screen when logging. Deselect
“Show LCD” when setting up the logger as described in
the next section. When this option is disabled, you can
still temporarily view the LCD screen by pushing the
Start/Stop button for 1 second. The LCD remains on for
10 minutes.
•The LCD screen refreshes every 15 seconds regardless of
the logging interval selected in the app. If you choose a
logging interval less than 15 seconds, the data is
recorded at the faster interval, but the sensor readings
are updated on the screen only every 15 seconds.
•When the logger has stopped logging, the LCD screen
remains on and displays “STOP” until the logger is
offloaded to your mobile device (unless the logger is
configured with the “Show LCD” option disabled). Once
the logger has been offloaded, the LCD turns off
automatically after 2 hours. The LCD turns back on the
next time the logger connects with your device through
the app.
•The LCD screen flashes “HELLO” when you page the
logger from the app (see Downloading the App and
Connecting to a Logger).
•The LCD screen flashes “CHIRP OFF” when an audible
alarm is cleared.
Downloading the App and
Connecting to a Logger
Install the app to connect to and work with the logger.
1. Download the app. Download HOBOconnect to a phone or
tablet from the App Store® or Google Play™ or download
the app to a Windows computer from
www.onsetcomp.com/products/software/hoboconnect.
2. Install the batteries. Open the battery door on the back of
the logger and insert two AAA batteries observing polarity
(see Battery Information). Reinsert the battery door and
snap it back into place.
3. Open the app. Enable Bluetooth in your device settings if
prompted.
4. Connect to the logger. Tap Devices and then tap the logger
tile in the app to connect to it.

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If the logger does not appear or if it is having trouble
connecting, follow these tips:
•Make sure the logger is within range of your mobile
device or computer. The range for successful wireless
communication is approximately 30.5 m (100 ft) with full
line-of-sight.
•If your device can connect to the logger intermittently or
loses its connection, move closer to the logger, within
sight if possible.
•If the logger appears in the app, but you cannot connect
to it, close the app and then power down your device to
force the previous Bluetooth connection to close.
Once the logger is connected, you can:
Tap this: To do this:
Specify logger settings and save them onto the
logger to start logging. See Configuring the
Logger.
Tap to view live data.
Stop a beeping alarm on the logger if audible
alarms are enabled as described in Setting up
Alarms.
Lock the logger. Set a password for the logger so
that it is not mistakenly stopped or reconfigured.
Tap the icon, enter a password, and then tap Set.
Once a password is entered on a phone or tablet,
that mobile device is the only one to
“remember” it. This means you can connect to
the logger without entering a password on that
mobile device, but you must enter a password on
all other mobile devices. For example, if you set
the password for the logger with your tablet and
then try to connect to the device later with your
phone, you must enter the password on the
phone but not with your tablet. Similarly, if
others attempt to connect to the logger with
different devices, they are also required to enter
the password.
To reset a password:
•Simultaneously press both the Start/Stop
button and the Alarm/Stats button for 3
seconds, or
•Tap Manage Password and then tap Reset.
Manage Password. Reset your existing password
or set a new password for the logger.
Stop logging data (this overrides any Stop
Logging settings described in Configuring the
Logger).
Start logging if the logger was configured to start
with a button push. See Configuring the Logger.
Download logger data. See Downloading Data
From the Logger.
Mark the logger as a favorite. You can then filter
the list of devices to show only loggers marked as
favorites.
Make the logger beep one time to help you
locate it. “HELLO” also appears on the LCD when
the logger is paged.
Update the firmware on the logger. A logger
readout will be completed automatically at the
beginning of the firmware update process.
Important: Before updating the firmware on the
logger, check the remaining battery level and
make sure it is no less than 30%. Make sure you
have the time to complete the entire update
process, which requires that the logger remains
connected to the device during the upgrade.
Configuring the Logger
Use the app to set up the logger, including setting alarms,
selecting the options to start and stop logging, and choosing a
logging mode. These steps provide an overview of setting up
the logger. For complete details, see the HOBOconnect User
Guide.
1. In the app, tap Devices and then tap the logger tile to
connect to it.
2. Tap Configure & Start to configure the logger.
3. Tap Name and type a name for the logger (optional). If you
do not enter a name, the app uses logger serial number as
the name.
4. Tap Group to add the logger to a group (optional).
5. Tap Logging Interval and choose how frequently the logger
will record data unless operating in burst logging mode (see
Burst Logging).
6. Tap Start Logging and select when logging begins:
•On Save. Logging begins immediately after configuration
settings are saved.
•On Next Interval. Logging begins at the next even
interval as determined by the selected logging interval.
•On Button Push. Logging begins when you press either
the Start/Stop logging button on the logger for 3 seconds
or start logging with the app.
•On Date/Time. Logging begins at a date and time you
specify. Select the Date and Time.
5. Tap Stop Logging and specify when logging ends.
•Never Stop (Overwrites Old Data). The logger does
not stop at any predetermined time. The logger
continues recording data indefinitely, with newest data
overwriting the oldest.
•On Date/Time. The logger stops logging on a specific
date and time that you specify.
•After. Select this if you want to control how long the
logger should continue logging once it starts. Choose
the amount of time you want the logger to log data.
For example, select 30 days if you want the logger to
log data for 30 days after logging begins.
•Stop When Memory Fills. The logger continues
recording data until the memory is full.

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6. Tap Pause Options, then select Pause On Button Push to
specify that you can pause the logger by pressing its button
for 3 seconds. Select Allow Button Resume to specify that
you can press the Start/Stop button on the logger to
resume logging.
Important: When you select Allow Button Resume and
you use the Start/Stop button on the logger to stop and
restart logging, logging restarts on the next even logging
interval, not at the time you pushed the button. For
example, a logger started logging at 7:00 AM with a
logging interval set to 1 hour. If you press the Start/Stop
button to stop the logger at 8:45 AM and then press the
button again at 10:15 AM, logging will not begin
immediately at 10:15 AM. Instead, logging will begin
again at 11:00 AM, which is the next even interval time
based on your 1-hour logging interval. Depending on the
logging interval, the gap between the time you press the
button to resume logging and the time actual logging
begins could be significant. The faster the logging
interval, the less time elapses before logging resumes.
7. Tap Logging Mode. Select either fixed or burst logging. With
fixed logging, the logger records data for all enabled sensors
and/or selected statistics at the logging interval selected
(see Statistics Logging for details on choosing statistics
options). In burst mode, logging occurs at a different
interval when a specified condition is met. See Burst
Logging for more information.
8. Enable or disable Show LCD, which controls whether the
LCD on the logger remains illuminated while the logger is
logging. If you disable Show LCD, the LCD on the logger does
not show the current reading, status, or other information
while the logger is logging. You can temporarily turn the
LCD screen on by pressing the Start/Stop button on the
logger for 1 second. In addition, you can always view the
status of any in-range logger on your mobile device
regardless of the logger’s LCD setting (may require a logger
password as applicable).
9. Select the sensor measurement types that you want to log.
By default, both the temperature and RH sensors are
enabled. Both sensors are required to calculate dew point,
which is an additional data series available for plotting after
downloading data from the logger. You can also set up
alarms to trip when a sensor reading rises above or falls
below a specified value. See Setting up Alarms for details on
enabling sensor alarms and selecting the associated audible
and visual alarm settings.
10. Select whether to upload data to HOBOlink® via the
gateway or the app (optional and requires an active
HOBOlink account).
11. Tap Start to save the configuration settings.
Logging begins based on the settings you selected. Press the
start button on the logger if you set it up to start logging with a
button push. Deploy the logger 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).
Setting up Alarms
You can set an alarm to trip on the logger when a sensor
reading rises above or falls below a specified value. This alerts
you to problems so you can take corrective action. To set an
alarm:
1. Tap Devices.
2. Tap the logger tile in the app to connect to it and tap
Configure & Start.
3. Tap a Sensor/Channel.
4. Tap Enable Logging, if necessary.
5. Tap Alarms to open that area of the screen.
6. Select Low if you want an alarm to trip when the sensor
reading falls below the low alarm value. Enter a value to set
the low alarm value.
7. Select High if you want an alarm to trip when the sensor
reading rises above the high alarm value. Enter a value to
set the high alarm value.
8. For the Duration, select how much time should elapse
before the alarm trips and select one of the following:
•Cumulative Samples. The alarm trips once the sensor
reading is out of the acceptable range for the selected
duration any time during logging. For example, if the high
alarm is set to 85°F and the duration is set to 30 minutes,
then the alarm trips once the sensor readings have been
above 85°F for a total of 30 minutes since the logger was
configured.
•Consecutive Samples. The alarm trips once the sensor
reading is out of the acceptable range continuously for
the selected duration. For example, the high alarm is set
to 85°F and the duration is set to 30 minutes, then the
alarm trips only if all sensor readings are 85°F or above
for a continuous 30-minute period.
9. Repeat steps 2–8 for the other sensor.
10. In the Alarm Settings area, enable Audible Alarm if you
want a beep to sound on the logger every 30 seconds when
the sensor alarm trips. The beeping continues until you
clear the alarm in the app, press either button on the top of
the logger, or 7 days have passed. Battery life is slightly
reduced when this setting is enabled. It is recommended
that you enable this feature only if you have regular access
to the logger so that you can easily turn off the beeping.
11. For Show Visual Alarms Until, select one of the following
options to determine how long the alarm icon remains
illuminated on the logger LCD screen after an alarm trips:
•Logger Reconfigured. The alarm icon remains visible on
the LCD until the next time the logger is reconfigured.
•Sensor in Limits. The alarm icon remains visible on the
LCD until the sensor reading returns to the normal range
between any configured high and low alarm limits.
•Alarm Button Pressed. The alarm icon remains visible
until you press the Alarm/Stats button on the logger.
Notes:
•The alarm icon is illuminated on the logger LCD when the
alarm trips. You can also press the Alarms/Stats button
on the logger to view the farthest out-of-range value
during the deployment. The logger checks alarm limits

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when the logger’s LCD screen refreshes every 15
seconds.
•The actual values for the high and low alarm limits are set
to the closest value supported by the logger. In addition,
alarms can trip or clear when the sensor reading is within
the resolution specifications. This means the value that
triggers the alarm may differ slightly from the value
entered.
•When you download data from the logger, alarm events
can be displayed on the plot or in the data file. See
Logger Events.
•Once cleared, an audible alarm starts beeping again if the
sensor values go out of the normal range. Even if an
audible alarm is cleared, a visual alarm may remain on
the logger LCD and in the app depending on the settings
selected for maintaining visual alarms or because the
alarm condition may still be in effect. In addition, an
audible alarm continues beeping when the sensor values
have returned to the normal range until it is cleared as
described in step 10.
•Although an audible alarm and a visual alarm can occur
at the same time when a sensor alarm is tripped, they are
cleared in different ways. The audible alarm can be
cleared as described in step 10. Meanwhile, a visual
alarm is cleared as determined by the setting selected for
Maintain Visual Alarm Until configuration setting. This
means you could clear a beeping audible alarm and the
visual alarm remains on the LCD and in the app until the
logger is reconfigured, the sensor is in limits, or the alarm
button is pressed—depending on the setting you
selected.
•If the logger is configured to stop logging with a button
push, any tripped alarms are cleared automatically when
logging is stopped and no Alarm Cleared event is logged.
This ensures that the logger starts checking for alarm
conditions when logging resumes (if the logger was
configured with Allow Button Resume selected).
Burst Logging
Burst logging is a logging mode that allows you to set up more
frequent logging when a specified condition is met. For
example, a logger is recording data at a 5-minute logging
interval and burst logging is configured to log every 30 seconds
when the temperature rises above 85°F (the high limit) or falls
below 32°F (the low limit). This means the logger records data
every 5 minutes as long as the temperature remains between
85°F and 32°F. Once the temperature rises above 85°F, the
logger switches to the faster logging rate and records data
every 30 seconds until the temperature falls back to 85°F. At
that time, logging then resumes every 5 minutes at the fixed
logging interval. Similarly, if the temperature falls below 32°F,
then the logger switches to burst logging mode again and
record data every 30 seconds. Once the temperature rises back
to 32°F, the logger then returns to fixed mode, logging every 5
minutes. Note: Sensor alarms, statistics, and the Stop Logging
option Never Stop (Overwrites Old Data) are not available in
burst logging mode.
To set up burst logging:
1. Tap Devices. Press the Start/Stop button on the logger to
wake it up, if necessary.
2. Tap the logger tile in the app to connect to the logger and
tap Configure & Start.
3. Tap Logging Mode and then tap Burst Logging.
4. Set the burst logging interval, which must be faster than the
logging interval. Keep in mind that the faster the burst
logging rate, the greater the impact on battery life and the
shorter the logging duration. Because measurements are
being taken at the burst logging interval throughout the
deployment, the battery usage is similar to what it would be
if you had selected this rate for the normal logging interval.
5. Select Low and/or High and type a value to set the low
and/or high values.
6. Repeat step 5 for the other sensor if desired.
Notes:
•The high and low burst limits are checked only when the
logger's LCD screen refreshes once every 15 seconds. If
you set the logging interval to less than 15 seconds and
the sensor reading falls outside the levels, burst logging
does not begin until the next 15-second refresh cycle.
•If high and/or low limits are configured for more than
one sensor, burst logging begins when any high or low
condition goes out of range. Burst logging does not end
until all conditions on all sensors are back within normal
ranges.
•The actual values for the burst logging limits are set to
the closest value supported by the logger.
•Burst logging mode can begin or end when the sensor
reading is within the resolution specifications. This means
the value that triggers burst logging may differ slightly
from the value entered.
•Once the high or low condition clears, the logging
interval time is calculated using the last recorded data
point in burst logging mode, not the last data point
recorded in fixed mode. For example, a logger has a 10-
minute logging interval and logs a data point at 9:05.
Then, the high limit is surpassed and burst logging begins
at 9:06. Burst logging then continues until 9:12 when the
sensor reading falls back below the high limit. Now back
in fixed mode, the next logging interval is 10 minutes
from the last burst logging point, or 9:22 in this case. If
burst logging had not occurred, the next data point
would have been at 9:15.
•A New Interval event is created each time the logger
enters or exits burst logging mode. See Logger Events for
details on plotting and viewing the event. In addition, if
the logger is stopped with a button push while in burst
logging mode, a New Interval event is automatically
logged and the burst condition is cleared, even if the
actual high or low condition has not cleared. The logger
checks the high and low conditions when logging
resumes (if the logger is configured with Allow Button
Resume selected).
Statistics Logging
During fixed logging, the logger records data for enabled
sensors and/or selected statistics at the logging interval

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selected. Statistics are calculated at a sampling rate you specify
with the results for the sampling period recorded at each
logging interval. You can log the following statistics for each
sensor:
•The maximum, or highest, sampled value,
•The minimum, or lowest, sampled value,
•An average of all sampled values, and
•The standard deviation from the average for all sampled
values.
For example, a logger is configured with both the temperature
and RH sensors enabled, and the logging interval set to 5
minutes. The logger is set to Fixed Logging Mode and all four
statistics are enabled and with a statistics sampling interval of
30 seconds. Once logging begins, the logger measures and
records the actual temperature and RH sensor values every 5
minutes. In addition, the logger takes a temperature and RH
sample every 30 seconds and temporarily stores them in
memory. The logger then calculates the maximum, minimum,
average, and standard deviation using the samples gathered
over the previous 5-minute period and logs the resulting values.
When downloading data from the logger, this results in 10 data
series (not including any derived series, such as dew point): two
sensor series (with temperature and RH data logged every 5
minutes) plus eight maximum, minimum, average, and standard
deviation series (four for temperature and four for RH with
values calculated and logged every 5 minutes based on the 30-
second sampling).
To log statistics:
1. Tap Devices. Press the Start/Stop button on the logger to
wake it up, if necessary.
2. Tap the logger tile in the app to connect to it and tap
Configure & Start.
3. Tap Logging Mode and select Fixed Logging Mode.
4. Tap to turn on Statistics.
Note: Fixed Logging Mode records sensor measurements
taken at each logging interval. The selections you make in
the Statistics section add measurements to the recorded
data.
5. Select the statistics you want the logger to record at each
logging interval: Maximum, Minimum, Average, and
Standard Deviation (average is automatically enabled when
selecting Standard Deviation). Statistics are logged for all
enabled sensors. In addition, the more statistics you record,
the shorter the logger duration and the more memory is
required.
6. Enter a value in Statistics Sampling Interval to use for
calculating statistics. The rate must be less than, and a
factor of, the logging interval. For example, if the logging
interval is 1 minute and you select 5 seconds for the
sampling rate, the logger takes 12 sample readings between
each logging interval (one sample every 5 seconds for a
minute) and use the 12 samples to record the resulting
statistics at each 1-minute logging interval. Note that the
faster the sampling rate, the greater the impact on battery
life. Because measurements are being taken at the statistics
sampling interval throughout the deployment, the battery
usage is similar to what it would be if you had selected this
rate for the normal logging interval.
Once logging begins, click the Alarm/Stats button on the logger
to cycle through the current maximum, minimum, average, and
standard deviation data on the LCD screen. Note that the logger
always displays the current sensor readings in the app even if
they are not being logged. You can plot the statistics series
once you read out the logger.
Setting a Password
You can create an encrypted password for the logger that is
required if another device attempts to connect to it. This is
recommended to ensure that a deployed logger is not
mistakenly stopped or purposely altered by others. This
password uses a proprietary encryption algorithm that changes
with every connection.
To set a password:
1. Tap Devices. Press the Start/Stop button on the logger to
wake it up, if necessary. Tap the logger tile in the app to
connect to it.
2. Tap Lock Logger.
3. Type a password and then tap Set.
Only the device used to set the password can then connect to
the logger without entering a password; all other devices are
required to enter the password. For example, if you set the
password for the logger with your tablet and then try to
connect to the logger later with your phone, you must enter
the password on the phone but not with your tablet. Similarly,
if others attempt to connect to the logger with different
devices, they are also required to enter the password. To reset
a password, press the circle on the logger for 10 seconds or
connect to the logger and tap Manage Password and tap Reset.
Downloading Data From the Logger
To download data from the logger:
1. Tap Devices. Press the Start/Stop button on the logger to
wake it up, if necessary. Tap the logger tile in the app to
connect to the logger.
2. Tap Download Data. The logger downloads data to the
phone, tablet, or computer.
3. Once the download is complete, tap Done to return to the
previous page or tap Export and Share to save the file in the
specified format.
4. When the export file has successfully been created, tap
Done to return to the previous page or tap Share to use
your device’s usual modes of sharing.
You can also upload data automatically to HOBOlink, Onset’s
web-based software, using the app or the MX gateway. For
details, see the HOBOconnect User Guide and see the HOBOlink
help for details on working with data in HOBOlink.
Logger Events
The logger records the following internal events to track logger
operation and status. You can view events in exported files or
plot events in the app.

HOBO MX Temp/RH Data Logger (MX1101) Manual
1-508-759-9500 (U.S. and International) 8 www.onsetcomp.com
1-800-LOGGERS (U.S. only)
To plot events, tap HOBO Files and select a file to open.
Tap (if applicable) and tap . Select the events you want
to plot and tap OK.
Internal Event Name Definition
Host Connected The logger was connected to the mobile
device.
Started The Start/Stop button was pressed to begin
or resume logging.
Stopped The logger received a command to stop
recording data (from the app or by pushing
the Start/Stop button).
Button Up/Button
Down
The Start/Stop button was pressed for
1 second.
Chan <#> Alarm
Tripped
A sensor alarm has tripped; <#> is the sensor
number, where 1 is temperature and 2 is RH.
Chan <#> Alarm
Cleared
A sensor alarm has cleared; <#> is the sensor
number, where 1 is temperature and 2 is RH.
This event also contains the value that was
furthest out of range for the sensor before
the alarm cleared, which is only available in a
shared or exported file.
New Interval The logger has entered or exited burst
logging mode.
Safe Shutdown The battery level dropped below 1.85 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 magnets on the back of the logger case to
mount it to a magnetic surface.
•Attach Command strips to the back of the logger to
mount it a wall or other flat surface. Double up the two
Command strips so that they protrude past the magnets.
•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” on onsetcomp.com.
Battery Information
The logger requires two user-replaceable AAA 1.5 V alkaline or
optional lithium batteries for operation at the extreme ends of
the logger operating range. Expected battery life varies based
on the ambient temperature where the logger is deployed, the
logging or sampling interval, frequency of offloading and
connection to the mobile device, number of channels that are
active, audible alarms duration, use of burst mode or statistics
logging, and battery performance. New batteries typically last 1
year with logging intervals greater than 1 minute. Deployments
in extremely cold or hot temperatures, a logging interval faster
than 1 minute, or a sampling interval faster than 15 seconds
can impact battery life. Estimates are not guaranteed due to
uncertainties in initial battery conditions and operating
environment.
Note: Make sure the batteries installed have flat negative
terminals. There should be no indent in the bottom of the
batteries. Batteries with indents in the negative terminals may
become loose and prevent proper operation.
To install or replace the batteries:
1. Open the battery door on the back of the logger.
2. Remove any old batteries.
3. Insert two new batteries observing polarity.
4. Reinsert the battery door and snap it back into place.
WARNING: Do not cut open, incinerate, heat above 85°C
(185°F), or recharge the lithium batteries. The batteries 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 batteries in fire. Do not expose the contents of
the batteries to water. Dispose of the batteries according to
local regulations for lithium batteries.
Only use batteries
with flat negative
terminals
Do not use batteries with an
indent in the negative terminal
Battery door
Mounting
magnet
Mounting
magnets

HOBO MX Temp/RH Data Logger (MX1101) Manual
1-508-759-9500 (U.S. and International)
1-800-LOGGERS (564-4377) (U.S. only)
www.onsetcomp.com/support/contact
© 2014–2022 Onset Computer Corporation. All rights reserved. Onset, HOBO, HOBOconnect, and HOBOlink are
registered trademarks of Onset Computer Corporation. App Store, iPhone, iPad, and iPadOS are service marks or
registered trademarks of Apple Inc. Android and Google Play are trademarks of Google LLC. Windows is a registered
trademark of Microsoft Corporation. Bluetooth and Bluetooth Smart are registered trademarks of Bluetooth SIG, Inc.
All other trademarks are the property of their respective companies.
Patent #: 8,860,569 17840-U
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 HOBO MX1101 loggers 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.
NCC Statement
經型式認證合格之低功率射頻電機，非經許可，公司、商號或使用者均不得擅自變更頻率、加大功率或變更原設計之特性及功能。
低功率射頻電機之使用不得影響飛航安全及干擾合法通信；經發現有干擾現象時，應立即停用，並改善至無干擾時方得繼續使用。前項合法通信，指依電信法規定作
業之無線電通信。低功率射頻電機須忍受合法通信或工業、科學及醫療用電波輻射性電機設備之干擾。
Translation:
Article 12
Without permission granted by the NCC, any company, enterprise, or user is not allowed to change frequency, enhance transmitting power or alter original characteristic as well
as performance to an approved low power radio-frequency device.
Article 14
The low power radio-frequency devices shall not influence aircraft security and interfere with legal communications. If found, the user shall cease operating immediately until no
interference is achieved. The said legal communications means radio communications is operated in compliance with the Telecommunications Act. The low power radio-
frequency devices must be susceptible with the interference from legal communications or ISM radio wave radiated devices.