Onset HOBO MX CO2 Logger, MX1102 User Manual

HOBO® MX CO2 Logger (MX1102) Manual

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The HOBO MX CO2 data logger records carbon dioxide, temperature, and relative humidity (RH)
data in indoor environments using non-dispersive infrared (NDIR) self-calibrating CO2 sensor
technology and integrated temperature and RH sensors. This Bluetooth® Low Energy-enabled
logger is designed for wireless communication with a mobile device and also supports a USB
connection. Using the HOBOmobile® app on your phone or tablet or HOBOware software on your
computer, you can easily configure the logger, read it out, and view plotted data. 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. In addition, it supports burst logging in
which data is logged at a different interval when sensor readings are above or below certain
limits. This logger also has a built-in LCD screen to display the current CO2 level, temperature, RH,
logging status, battery use, memory consumption, and more.

Specifications

Temperature Sensor

Range 0° to 50°C (32° to 122°F)

HOBO MX CO2 Logger

MX1102

Included Items:

• Four AA 1.5 V alkaline
batteries

Required Items:

• HOBOmobile app and

device with iOS 8.3–9.0 or
Android™ 4.4, 5.0, or 5.1
and Bluetooth 4.0

OR

• HOBOware 3.7.3 or later
and USB cable

Accessories:

• Mounting kit with
mounting brackets, screws,
tie wraps, and Command™
strip

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 70% RH when CO2 sensor is enabled (non-condensing)

Accuracy ±2% from 20% to 80% typical at 25°C (77°F), see Plot B

Hysteresis ±2% RH

Resolution 0.01% at 25°C (77°F)

Drift <1% per year typical

O2 Sensor

Range 0 to 5,000 ppm

Accuracy ±50 ppm ±5% of reading at 25°C (77°F), less than 70% RH and 1,013

Warm-up Time 15 seconds

Calibration Auto or manual to 400 ppm

Non-linearity <1% of FS

Pressure Dependence 0.13% of reading per mm Hg (corrected via user input for

Operating Pressure Range 950 to 1,050 mbar (use Altitude Compensation for outside of this

Compensated Pressure
Range

Sensing Method Non-dispersive infrared (NDIR) absorption

Response Time

Temperature 12 minutes to 90% in airflow of 1 m/s (2.2 mph)

RH 1 minute to 90% in airflow of 1 m/s (2.2 mph)

CO2 1 minute 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 0° to 50°C (32° to 122°F); 0 to 95% RH (non-condensing)

*Per RH sensor manufacturer data sheet
Note: The HOBO U-Shuttle (U-DT-1) is not compatible with this logger.

1% to 90% RH when CO

mbar

elevation/altitude)

range)

-305 to 5,486 m (-1,000 to 18,000 ft)

sensor is disabled (non-condensing)

2

19198-E

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HOBO MX CO2 Data Logger (MX1102) Manual

Specifications (continued)

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

Time Accuracy ±1 minute per month at 25°C (77°F), see Plot C

Power Source 4 AA 1.5 Volt batteries (user replaceable) or USB power source (5 V

Battery Life 6 months, typical with logging and sampling intervals of 5 minutes or

Memory 128 KB (84,650 measurements, maximum)

Download Type USB 2.0 interface or via Bluetooth Smart

Full Memory Download Time 20 seconds via USB; approximately 60 seconds via Bluetooth Smart,

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

Size 7.62 x 12.95 x 4.78 cm (3.0 x 5.1 x 1.88 inches

Weight 267.4 g (9.43 oz)

Environmental Rating IP50

*Per RH sensor manufacturer data sheet
Note: The HOBO U-Shuttle (U-DT-1) is not compatible with this logger.

period

DC, 2 Watts)

slower; 6 months or less with logging and sampling intervals faster
than 5 minutes while logging CO
impact battery life. With HOBOmobile use, battery life can be
reduced by remaining connected, excessive readouts, checking of Full
Status Details, audible alarms, and paging. Visual/audible alarms and
other events can have a marginal impact on battery life.

may take longer the further the device is from the logger

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

. Entering burst logging mode will

2

Plot A: Temperature

Accuracy and Resolution

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Plot B: Typical RH Accuracy*

Plot C: Time Accuracy

HOBO MX CO2 Data Logger (MX1102) Manual

Logger Components and Operation

LCD Screen

USB Port

CO2 Sensor

Clear/Next Button

Start/Stop Button

RH Sensor

Temperature
Sensor

Calibrate Button

USB Port: Use this port to connect the logger to a computer for
use with HOBOware or to power the logger for longer
deployments or if faster logging intervals are required.

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 with a
push button start or stop (see Choosing Logger Settings). 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 Choosing Logger Settings).

Press both the Start/Stop button and the Clear/Next button
simultaneously for 3 seconds to reset a logger password.

Clear/Next 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
configured to maintain the alarm until the button is pressed
(see Setting up Alarms).

Calibrate Button: Press this button to start a five-minute
manual calibration process of the CO
configuring the logger with the manual calibration CO

sensor. This requires

2

sensor

2

setting enabled in HOBOmobile or HOBOware and bringing the
logger into a fresh air environment (see Calibrating the Logger).

Temperature Sensor: This sensor is located to the right of the
LCD screen below the large CO

sensor.

2

RH Sensor: This sensor is located behind the vented panel in
the logger case to the right of the temperature sensor.

Sensor: This sensor is located below the large vented

CO

2

circular panel to the right of the LCD screen.

LCD Screen: This logger is equipped with an LCD screen that
displays details about the current status. The example shows all
symbols illuminated on the LCD screen followed by definitions
of each symbol in the table.

LCD Symbol Description

The logger Is currently communicating with
HOBOmobile via Bluetooth. The more bars there
are, the stronger the Bluetooth signal.

The logger is currently communicating with
HOBOware via USB cable.

The logger is currently being powered by USB cable.

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.

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 Clear/Next button until the “alm” symbol
(described later in this table) is displayed on the
screen. This symbol at left will clear depending on
how alarms were configured to be cleared in the
software. If the alarm was set to clear when the
logger is reconfigured or relaunched, this symbol
will remain on the LCD until the next time the
logger is configured (see Setting up Alarms).
Otherwise, it will clear when the sensor reading is
back within the alarm limits or by pressing the
Clear/Next button for 3 seconds.

The logger is waiting to be started. 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.

An alarm displayed on the LCD is ready to be
cleared. This will only appear if the logger was
configured to maintain the alarm until the
Clear/Next button is pressed (for 3 seconds). Note
that an audible alarm can be silenced by pressing
the Start/Stop button or Clear/Next button for 1
second.

Press this button to view the latest statistics (if
enabled) or the sensor reading associated with a
tripped alarm.

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HOBO MX CO2 Data Logger (MX1102) Manual

LCD Symbol Description

Press this button for 5 seconds to manually
calibrate the CO
and “CO
minute manual calibration process.

These symbols show the maximum, minimum,
average, and standard deviation values most
recently calculated by the logger (if enabled).
Press the Next/Clear 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
Clear/Next button to view this reading. Press the
Clear/Next button again to cycle through any
statistics (defined above) and ultimately back to
the current sensor reading.

This is an example of a CO
million. If the logger is powered by battery: A new
segment appears in the status bar every 15
seconds to indicate how long until the display will
be updated. In this example, there are 18
segments. This means it has been 4 minutes and
30 seconds since the CO
the LCD. There are 30 seconds left (two segments)
before the reading will be updated on the LCD. If
the logger is powered by USB cable: The
segmented status bar is not displayed and the
current reading is updated every second.

This is an example of a temperature reading.
Temperature units are determined by the settings
in the software. To switch between Celsius and
Fahrenheit, change the units in the software and
then reconfigure the logger. Temperature readings
are updated on the LCD every 15 seconds if the
logger is battery-powered or every second if it is
USB-powered regardless of logging interval.

This is an example of an RH reading. RH readings
are updated on the LCD every 15 seconds if the
logger is battery-powered or every second if it is
USB-powered regardless of logging interval.

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 the software.

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

The logger has been stopped with the software or
because the memory is full.

sensor (if enabled). “Calibrate”

2

” will blink on the LCD during the 5-

2

reading in parts per

2

reading was updated on

2

Notes:

• You can disable the LCD screen in the software. When the
LCD is turned off for logging, you can still temporarily
view the LCD screen by pushing the Start/Stop or
Clear/Next button. The LCD will then remain on for 10
minutes.

• When the logger is connected to the computer with the
USB cable, the LCD screen refreshes every second
regardless of logging interval.

• When the logger has stopped logging, the LCD screen will
remain on with “STOP” displayed until the logger is

offloaded (unless the LCD screen was turned off in the
software). Once the logger has been offloaded, the LCD
will turn off automatically after 2 hours.

• The LCD screen flashes “HELLO” when you page the
logger from HOBOmobile (see Getting Started with
HOBOmobile).

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

Setting up the Logger

Important: The CO2 sensor within this logger can experience

measurement drift during storage and shipment. It is strongly
recommended that a manual calibration be performed prior to
deploying the logger. Start the logger as described in this
section and perform a manual calibration. See Calibrating the
Logger for more details; follow the manual calibration steps in
that section. Improper manual calibration can cause incorrect
sensor readings.

Install the batteries in the logger. Use a Phillips-head
screwdriver to open the battery cover on the back of the logger
and insert four AA batteries observing polarity (see Battery
Information). Screw the cover back in place.

You can use both the HOBOmobile app and HOBOware
software with this logger. The following sections provide an
overview for using the logger with both programs. You can
switch back and forth between the two programs (for example,
configure the logger in HOBOware, and read it out in
HOBOmobile). However, you can only connect to one program
at a time. If you attempt to use HOBOmobile while the logger is
connected to HOBOware, a message appears in HOBOmobile
indicating a live USB session is underway. If you attempt to use
the logger in HOBOware while it is connected to HOBOmobile,
the device will not be found. If you want to connect to
HOBOmobile after using the logger with HOBOware, you will
need to disconnect the USB cable once you are done with
HOBOware.

Getting Started with HOBOmobile

These steps provide an overview of setting up the logger with
HOBOmobile. For complete details, see the HOBOmobile User’s
Guide.

SM

1. Go to the App Store
HOBOmobile to your phone or tablet.

2. Open HOBOmobile and enable Bluetooth in your device
settings if prompted.

3. Tap and then tap the logger in the Recently Seen/In
Range list to connect to it. If the logger does not appear in
the list, follow these tips for connecting:

• Make sure the logger is within range of your mobile

device. 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 Recently Seen/In Range list,

but you cannot connect to it, close HOBOmobile and

or Google Play™ and download

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