Onset Onset MX1104-TEMP-06 Manual

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HOBO® MX Analog/Temp/RH/Light (MX1104) and
MX 4-Channel Analog (MX1105) Data Logger Manual

The HOBO MX Analog/Temp/RH/Light (MX1104) and HOBO MX 4-Channel Analog (MX1105)
data loggers measure and transmit data wirelessly from indoor environments to a mobile
device or computer using Bluetooth® Low Energy technology. The MX1104 model has
integrated temperature, relative humidity (RH), and light intensity sensors and one analog input
while the MX1105 model has four analog inputs. Both models support a wide variety of
external sensors (sold separately), including self-describing temperature, split-core AC current
transformer, 4-20 mA input, and DC voltage input sensors. The self-describing sensors are

MX1105 Model Shown

HOBO MX1104 and
MX1105 Data Loggers

designed with integrated strain relief for a secure connection to the loggers and are
automatically detected by the HOBOconnect® app for easy setup. Using the app, you can
configure the loggers, read out and view data, and export the data for further analysis. The
loggers can calculate minimum, maximum, average, and standard deviation statistics and can
also be configured to trip audible or visual alarms at thresholds you specify. In addition, both
loggers support burst logging in which data is logged at a different interval when sensor
readings are above or below certain limits. These compact loggers also have built-in LCD
screens to display current sensor readings, logging status, battery use, memory consumption,
and more.

Models:

• Analog/Temp/RH/Light
(MX1104)

• 4-Channel Analog
(MX1105)

Included Items:

• Tie wraps

• Two AAA 1.5 V alkaline

batteries (installed)

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

Specifications

Temperature Sensor (MX1104)

Range -20° to 70°C (-4° to 158°F)

Accuracy ±0.20°C from 0° to 50°C (±0.36°F from 32° to 122°F)

Resolution 0.002°C at 25°C (0.004°F at 77°F)

Drift <0.1°C (0.18°F) per year

RH Sensor* (MX1104)

Range 0% to 100% at -20° to 70°C (-4° to 158°F); exposure to conditions

Accuracy ±2.5% from 10% to 90% (typical) to a maximum of ±3.5% including

Resolution 0.01%

Drift <1% per year typical

Response Time (MX1104)

Temperature 11 minutes in air moving 1 m/s (2.2 mph)

RH 30 seconds to 90% in airflow of 1 m/s (2.2 mph)

Light Sensor (MX1104)

Range 0 to 167,731 lux (15,582 lum/ft2)

Accuracy ±10% typical for direct sunlight (see Light Measurement on page 4 for

Logger with
Cable Type

Measurement
Range

Accuracy ±0.001 mA

Resolution 0.3 µA 40 µV 80 µV 160 µV 384 µV

SD-MA-420 or
CABLE-4­20mA

0 to 20.1 mA 0 to 2.5 V 0 to 5.0 V 0 to 10 V 0 to 24 V

±0.2% of
reading

above 95% may temporarily increase the maximum RH sensor error
by an additional 1%

hysteresis at 25°C (77°F); below 10% and above 90% ±5% typical

more details)

SD-VOLT-2.5
or CABLE-2.5­STEREO

±0.1 mV
±0.1% of
reading

SD-VOLT-05
or CABLE­ADAP5

±0.2 mV
±0.3% of
reading

SD-VOLT-10
or CABLE­ADAP10

±0.4 mV
±0.3% of
reading

SD-VOLT-24
or CABLE­ADAP24

±1.0 mV
±0.3% of
reading

23968-G

Logger

Operating Range -20° to 70°C (-4° to 158°F)

Radio Power 1 mW (0 dBm)

HOBO MX Analog/Temp/RH/Light (MX1104) and MX 4-Channel Analog (MX1105) Manual

Specifications (continued)

Transmission Range Approximately 30.5 m (100 ft) line-of-sight

Wireless Data Standard Bluetooth Low Energy (Bluetooth Smart)

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)

Battery Type Two AAA 1.5 V alkaline batteries, user replaceable

Battery Life 1 year, typical with logging interval of 1 minute and Bluetooth Always

Memory 4 MB (1.9 million measurements, maximum)

Full Memory Download Time Approximately 4 to 15 minutes depending on the mobile device; may

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

Size 11.28 x 5.41 x 2.92 cm (4.44 x 2.13 x 1.15 in.)

Weight 123 g (4.34 oz)

Environmental Rating IP54

period

On enabled; 2 years, typical with logging interval of 1 minute and
Bluetooth Always On disabled; and temperatures between 0° and
50°C (32° and 122°F). Faster logging intervals and statistics sampling
intervals, burst logging, remaining connected with the app, excessive
downloads, and paging may impact battery life.

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 re
directives in the European Union (EU).

See last page

levant

*Per RH sensor manufacturer data sheet

Logger Components and Operation

RH Sensor

Light Sensor

Temperature
Sensor (internal)
and Venting Pipe

RH Sensor: This sensor is located in the upper left corner and to
the left of the LCD screen in the MX1104 model.

Light Sensor: This sensor is located below the RH sensor and to
the left of the LCD screen in the MX1104 model.

Temperature Sensor: This sensor is located in the bottom left
corner and to the left of the LCD screen in the MX1104 model.
A small pipe protrudes from the bottom side of the logger case
to vent the temperature sensor.

Analog Sensor
Port

MX1104 Model

Top Button

Bottom
Button

LCD Screen

Plug

Self-Describing Sensor

MX1105 Model

Mounting
Loop

Analog Sensor Port: Use this 2.5 mm jack to connect a self­describing sensor or other analog sensor. The MX1104 model
has one port and the MX1105 model has four ports.

Top 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).

2

HOBO MX Analog/Temp/RH/Light (MX1104) and MX 4-Channel Analog (MX1105) Manual

You can also press the top button for 1 second to wake up the
logger, bring the logger to the top of the list in the app, cycle
through each channel on the LCD, silence a beeping alarm (see
Setting up Alarms), and turn the LCD screen on if the option to
turn off the LCD has been enabled (see Configuring the Logger).

Bottom Button: When statistics are being logged, press this
button for 1 second to switch between the latest sensor
reading, statistics, and an alarm reading (if applicable) for the
channel currently displayed. If no statistics are being logged
and a sensor alarm trips, press this button for 1 second to view
the alarm reading for the channel currently displayed. You can
also press this button for 1 second to wake up the logger,
silence a beeping alarm, or turn the LCD screen on if the option
to turn off the LCD has been enabled. Press this button for 3
seconds to clear a visual alarm if the logger was configured in
the app to maintain the visual alarm until the alarm button was
pressed (see Setting up Alarms). Press both the top and bottom
buttons simultaneously for 10 seconds to reset a logger
password.

Self-Describing Sensor: This is a type of external sensor
available for MX1104 and MX1105 loggers. Turn the sensor
plug one-quarter clockwise when inserting it into an analog
sensor port to secure it in place. This sensor also features
automatic detection by the logger (see Working with Sensors).

Plug: Use this Santoprene® (TPE) plug to fill an empty analog
sensor port.

Mounting Loops: Use the two mounting loops (only one visible
in the diagrams) to mount the logger with tie wraps (see
Mounting 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.

LCD Symbol Description

The logger is waiting to be started or restarted.
Press and hold the top button for 3 seconds to
start the logger; HOLD will also be displayed
during this time.

The logger has been started with push button stop
enabled. Press and hold the top button for 3
seconds to stop the logger; HOLD will also be
displayed during this time.

This is displayed while pressing the top button for
3

seconds to start, stop, or restart the logger, or
while pressing the bottom button for 3 seconds to
clear an alarm.

This is displayed when there is more
channel being logged. Press the top button to
cycle through each channel to view sensor
measurements.

than one

LCD Symbol Description

Statistics are being logged. Press the bottom
button to switch between the current
readings, statistics, and any alarm readings for
each channel.

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

The battery indicator
battery power remaining.

The logger has been configured to stop
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
logging (wrapping). The logger will continue
recording data indefinitely, with newest data
overwriting the oldest data until the battery
voltage is depleted 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 curr

This indicates a sensor alarm
the top button to view the channel with the alarm
icon. Press the bottom button to view the reading
that tripped the alarm. The “alm” symbol
(described below) is displayed on the screen with
the reading (or dashes if the alarm has already
cleared). This symbol at left will clear depending
on how visual alarms were configured in the app.
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 Configuring the
Logger). Otherwise, it will clear when the sensor
reading is back within the alarm limits or by
pressing the bottom button for 3 seconds.

This is displayed with the reading tha
alarm. While viewing the channel with the alarm,
press the bottom button to see the reading (you
may need to cycle through statistics readings first
if applicable). If the alarm cleared, dashes (- - - -)
will display instead of a reading.

A visual alarm is ready
appear if the app was configured to maintain the
visual alarm until the alarm button is pressed.
While viewing the channel with the alarm on the
LCD, press the bottom button for 3 seconds to
clear the visual alarm. Note that an audible alarm
can be silenced by pressing the top or bottom
button for 1 second.

This indicates a problem with an exter
See Working with External Sensors for more
details.

the maximum, minimum,

shows the approximate

configured to never stop

ently logging.

has tripped. Press

to be cleared. This will only

sensor

logging

t

tripped the

nal sensor.

3

HOBO MX Analog/Temp/RH/Light (MX1104) and MX 4-Channel Analog (MX1105) Manual

LCD Symbol Description

This is an example of a sensor reading, with the
latest reading displayed above the unit type for
that sensor. To switch between US and SI units,
change the units in the app Settings (the logger
must be reconfigured for units changes to take
effect). Note: If the sensor value exceeds five
digits, then the scientific notation E3 is appended
to the value on the LCD to signify that the
displayed digits are multiplied by 1,000. For
example, a value of 100,000 is displayed as 100E3
on the LCD. This only affects the LCD; logged data
contains all digits.

The logger has been configured to star
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
logger from the app.

The logger has been stopped with the app or
because the memor

y is full.

t logging on

onto the

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 top
or bottom button for 1 second. The LCD will then remain
on for 10 minutes.

• The LCD screen refreshes at the same rate as the loggi
interval.

• 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 1 hour. The LCD will turn back on the
next time you press the top or bottom button to wake up
the logger.

• The LCD screen flashes “HELLO” when you page th

ogger from the app (see Downloading the App an

l

Connectin

g to a Logger

).

• The LCD screen flashes “BOOT” when a firmware upgrade
is underway.

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

Button Functionality Quick Reference

Button Press for 1 second to:

Top
button

• Cycle through each
channel to view the
latest sensor readings

• Wake up the logger

• Bring the logger to the

top of the list in the
app

• Silence a beeping
alarm

• Turn on LCD

Press and
hold for
3 seconds to:

Start, stop, or
resume
logging
(depending on
settings
chosen in the
app)

Press and
hold for 10
seconds to:

NA

Button Press for 1 second to:

Bottom
button

Both
buttons

• Cycle through any
statistics and alarm
readings for the
channel currently
displayed (if
applicable)

• Wake up the logger

• Silence a beeping

alarm

• Turn on LCD

NA NA Reset a

Press and
hold for
3 seconds to:

Clear an alarm
for the
channel
currently
displayed
(depending on
the settings
chosen in the
app)

Press and
hold for 10
seconds to:

NA

password

Light Measurement (MX1104)

The MX1104 logger measures light intensity in units of
lumens/ft2 or lux. The light sensor in the MX1104 has a spectral
response that tightly matches the photopic response of the
human eye. This is shown in Plot A.

The light sensor has range of 0 to 167,731 lux (15,582 lum/ft2).
The resolution of the light measurement varies from 1 unit of
lux or lum/ft2 in very dim light to 40 lux (4 lum/ft2) for a full
scale measurement.

ng

e

d

Light Measurement Accuracy

Although the MX1104 is factory calibrated to account for the
light attenuation of the plastic enclosure, you may notice a

e

difference in the MX1104 reading compared to a commercially
available lux meter. Ideally, a light meter’s response should be
proportional to the cosine of the angle at which the light is
incident. The MX1104 does not collect light exactly according to
this rule. Plot B illustrates the difference between an ideal
cosine response and the approximate response of the MX1104.
The MX1104 is calibrated to give best results for direct
illumination, but this is not always the case.

Plot A

4