Onset MX1101 Operating Manual

HOBO® MX Temp/RH Data Logger (MX1101) Manual

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-enabled
logger is designed for wireless communication with a mobile device. Using the HOBOmobile®
app, you can easily configure the logger, read it out, and view data on your phone or tablet, or
export the data for further analysis. The logger can calculate minimum, maximum, average, and
standard deviation statistics and 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)

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:

• HOBOmobile app

• Device with iOS or

Android™ and Bluetooth

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

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 Wrap when full or stop when full

Start Modes Immediate, push button, date & time, or next interval

Stop Modes When memory full, push button, date & time, or after a set logging

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

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

*Per RH sensor manufacturer data sheet

hysteresis at 25°C (77°F); below 20% and above 80% ±6% typical

period

statistics sampling intervals, entering burst logging mode, and
remaining connected with HOBOmobile will impact battery life.
Excessive readouts, checking of Full Status Details, audible alarms,
and paging all impact battery life. Visual alarms and other events can
have a marginal impact on battery life.

from the logger

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HOBO MX Temp/RH Data Logger (MX1101) Manual

Specifications (continued)

LCD LCD is visible from 0° to 50°C (32° to 122°F); the LCD may react slowly

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

*Per RH sensor manufacturer data sheet

or go blank in temperatures outside this range

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

See last page

Plot A: Temperature

Accuracy and Resolution

Plot B: Time Accuracy

Logger Components and Operation

Start/Stop Button

LCD Screen

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
HOBOmobile with a push button start or stop, and with Allow
Button Restart selected (see Setting up the Logger). You can
also press this button for 1 second to record an internal event
(see Recording Internal 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 Setting up
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 was

Alarm/Stats Button

Temperature

Sensor

Mounting

Loop

RH Sensor (behind panel)

configured in HOBOmobile to maintain the visual alarm until
the alarm button was 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.

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HOBO MX Temp/RH Data Logger (MX1101) Manual

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.

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 will be 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 (wrapping). The logger will continue
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 will be empty.
In this example, the memory is full (all five
segments are filled in) and new data is now
overwriting the oldest data. This will continue 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 will clear depending on how visual
alarms were configured in HOBOmobile. If the
visual alarm was set to clear when the logger is
reconfigured, this symbol will remain on the LCD
until the next time new configure settings are
loaded onto the logger (see Setting up the Logger).
Otherwise, it will clear 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 will only
appear if HOBOmobile was 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 an audible alarm
can be silenced by pressing the Start/Stop button
or Alarm/Stats button for 1 second.

These symbols show the maximum, minimum,
average, and standard deviation values most
recently calculated by the logger (if the logging
mode has been set to Fixed Interval in
HOBOmobile and each statistic has been selected;
see Statistics Logging). Press the Alarm/Stats
button for 1 second to cycle through the available
statistics and then back to the current sensor
reading (or to the alarm value if applicable).

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 HOBOmobile. To switch between Celsius and
Fahrenheit, change the units in the HOBOmobile
Settings (the logger must be reconfigured 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 will count down
in days, hours, minutes, and seconds until logging
begins. In this example, 5 minutes and 38 seconds
remain until logging will begin.

The configure settings are being loaded onto the
logger from HOBOmobile.

An error occurred while loading the configure
settings onto the logger from HOBOmobile. Try
reconfiguring the logger.

The logger has been stopped with HOBOmobile 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 will then remain
on for 10 minutes.

• The LCD screen refreshes every 15 seconds regardless of
the logging interval selected in HOBOmobile. If you
choose a logging interval less than 15 seconds, the data
will be recorded at the faster interval, but the sensor
readings will only be updated on the screen every 15
seconds.

• When the logger has stopped logging, the LCD screen will
remain on with “STOP” displayed until the logger is
offloaded to your mobile device (unless the logger was
configured with the “Show LCD” option disabled). Once
the logger has been offloaded, the LCD will turn off
automatically after 2 hours. The LCD will turn back on the
next time the logger connects with your device through
HOBOmobile.

• The LCD screen flashes “HELLO” when you page the
logger from HOBOmobile (see Downloading HOBOmobile
and Connecting to a Logger).

• The LCD screen flashes “CHIRP OFF” when an audible
alarm is cleared.

Downloading HOBOmobile and
Connecting to a Logger

Install the HOBOmobile app to connect to and work with the
logger.

1. Download HOBOmobile. Go to the App Store® or Google

Play™ and download the HOBOmobile app to your phone or
tablet.

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 HOBOmobile. Enable Bluetooth in your device
settings if prompted.

4. Connect to the logger. Tap the HOBOs icon (on Android
devices) or tap the Devices icon and then tap Loggers at the

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