Hobo Mx1104 User manual

HOBO® MX Analog/Temp/RH/Light (MX1104) and

MX 4-Channel Analog (MX1105) Data Logger Manual

23968-H

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 (BLE) 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

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.

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

above 95% may temporarily increase the maximum RH sensor error

by an additional 1%

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

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

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

more details)

Logger with

Cable Type

SD-MA-420 or

CABLE-4-

20mA

SD-VOLT-2.5

or CABLE-2.5-

STEREO

SD-VOLT-05

or CABLE-

ADAP5

SD-VOLT-10

or CABLE-

ADAP10

SD-VOLT-24

or CABLE-

ADAP24

Measurement

Range

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

Accuracy ±0.001 mA

±0.2% of

reading

±0.1 mV

±0.1% of

reading

±0.2 mV

±0.3% of

reading

±0.4 mV

±0.3% of

reading

±1.0 mV

±0.3% of

reading

Resolution 0.3 µA 40 µV 80 µV 160 µV 384 µV

Logger

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

Radio Power 1 mW (0 dBm)

HOBO MX1104 and

MX1105 Data Loggers

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

MX1105 Model Shown

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

1-508-759-9500 (U.S. and International) 2 www.onsetcomp.com

1-800-LOGGERS (U.S. only)

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

period

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

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.

Memory 4 MB (1.9 million measurements, maximum)

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

take longer the further the device is from the logger

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 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

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

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: Use this 2.5 mm jack to connect a self-

describing 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).

MX1104 Model

Analog Sensor

Port

Bottom

Button

Top Button

Light Sensor

Temperature

Sensor (internal)

and Venting Pipe

Mounting

Loop

Self-Describing Sensor

Plug

LCD Screen

MX1105 Model

RH Sensor

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

1-508-759-9500 (U.S. and International)

1-800-LOGGERS (564-4377) (U.S. only)

www.onsetcomp.com/support/contact

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 23968-H

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 you are logging statistics, 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 you are not logging statistics 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; the logger also displays HOLD

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; the logger also displays

HOLD during this time.

The logger displays HOLD when you press 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.

The logger displays NEXT when it is logging more

than one. Press the top button to cycle through

LCD Symbol Description

each channel to view sensor measurements.

The logger is logging statistics. Press the bottom

button to switch between the current sensor

readings, statistics, and any alarm readings for

each channel.

These symbols show the maximum, minimum,

average, and standard deviation values most

recently calculated by the logger (if the logging

mode is set to Fixed Logging Interval in the app

and you have selected each statistic; 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 shows the approximate

battery power remaining.

The logger is set to Stop When Memory Fills. The

memory bar indicates the approximate amount of

storage space remaining in the logger. When the

logger first starts logging data, all five segments

are empty. In this example, the logger memory is

almost full (only one segment in the memory bar is

empty).

The logger is set to Never Stop (Overwrites Old

Data). The logger continues recording data

indefinitely, with newest data overwriting the

oldest data until the battery voltage is depleted or

the logger is reconfigured. When the logger first

starts logging data, all five segments in the

memory bar are empty. In this example, the

memory is full (all five segments are filled) and

new data is now overwriting the oldest data.

The logger is currently logging.

The bell icon indicates a sensor alarm has tripped.

Press 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 (dashes are displayed if the alarm has

already cleared). The alarm symbol clears

depending on the setting for Show Visual Alarms

in the app. If the it is set to Logger Reconfigured

(clears when the logger is reconfigured), this

symbol remains 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 when you press the bottom button for 3

seconds.

This is displayed with the reading that tripped the

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 (- - - -)

appear instead of a reading.

A visual alarm is ready to be cleared. This appears

only if the setting for Show Visual Alarms in the

app is set to Alarm Button Pressed (maintain the

visual alarm until you press the alarm button).

While viewing the channel with the alarm on the

LCD, press the bottom button for 3 seconds to

clear the visual alarm. You can silence an audible

alarm by pressing the top or bottom button for 1

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

1-508-759-9500 (U.S. and International)

1-800-LOGGERS (564-4377) (U.S. only)

www.onsetcomp.com/support/contact

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 23968-H

LCD Symbol Description

second.

This indicates a problem with an external sensor.

See Working with External Sensors for more

details.

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 Settings area of the app

(reconfigure the logger to have your units changes

take effect). Note: If the sensor value exceeds five

digits, 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 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 configuration settings are being loaded onto

the logger from the app.

The logger was stopped by 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 top

or bottom button for 1 second. The LCD then remains on

for 10 minutes.

•The LCD screen refreshes at the same rate as the logging

interval.

•When the logger has stopped logging, the LCD screen

remains on with “STOP” displayed until you download

data from the logger to your mobile device (unless the

logger was configured with the “Show LCD” option

disabled). Once you have downloaded data from the

logger, the LCD turns off automatically after 1 hour. The

LCD turns 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 the

logger from the app (see Downloading the App and

Connecting to a Logger).

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

is underway.

•The LCD screen flashes “CHIRP OFF” when you clear an

audible alarm.

Button Functionality Quick Reference

Button Press for 1 second to:

Press and

hold for

3 seconds to:

Press and

hold for 10

seconds to:

Top

button

•Cycle through each

channel to view the

Start, stop, or

resume

Button Press for 1 second to:

Press and

hold for

3 seconds to:

Press and

hold for 10

seconds to:

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

logging

(depending on

settings

chosen in the

app)

Bottom

button

•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

Clear an alarm

for the

channel

currently

displayed

(depending on

the settings

chosen in the

app)

Both

buttons

NA NA Reset a

password

Light Measurement (MX1104)

The MX1104 logger measures light intensity in units of

lumens/ft

or lux. The light sensor in the MX1104 has a spectral

response that tightly matches the photopic response of the

human eye as illustrated in Plot A.

The light sensor has a range of 0 to 167,731 lux (15,582

lum/ft

). The resolution of the light measurement varies from 1

unit of lux or lum/ft

in very dim light to 40 lux (4 lum/ft

) for a

full scale measurement.

Plot A

Light Measurement Accuracy

Although the MX1104 is factory calibrated to account for the

light attenuation of the plastic enclosure, you may notice a

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.

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

1-508-759-9500 (U.S. and International)

1-800-LOGGERS (564-4377) (U.S. only)

www.onsetcomp.com/support/contact

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 23968-H

The MX1104 is calibrated to give best results for direct

illumination, but this is not always the case.

Plot B

The MX1104 is also calibrated to give best results in sunlight.

Because artificial indoor and outdoor lights have spectral

properties that differ from sunlight, the MX1104 may show an

error of greater than ±10% when compared to a commercially

available lux meter in these situations. Multiple MX1104

loggers, however, typically exhibit ±10% agreement with each

other in any type of light.

Downloading the App and

Connecting to a Logger

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

1. Download HOBOconnect to a phone or tablet from the App

Store® or Google Play™.

Download the app to a Windows computer from

www.onsetcomp.com/products/software/hoboconnect.

2. Open the app and enable Bluetooth in your device settings

if prompted.

3. Press either button on the logger to wake it up.

4. Tap Devices and then tap the logger tile in the app to

connect to the logger.

If the logger does not appear or if it is having trouble

connecting, follow these tips:

•If the logger is configured with Bluetooth Always On

disabled (see Configuring the Logger), make sure the

logger is “awake” by pressing the top or bottom button.

Press the top button again to bring the logger to the top

of the list if you are working with multiple loggers.

•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.

•Change the orientation of your device to ensure the

antenna is pointed toward the logger. Obstacles between

the antenna in the device and the logger may result in

intermittent connections.

•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.

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

1-508-759-9500 (U.S. and International)

1-800-LOGGERS (564-4377) (U.S. only)

www.onsetcomp.com/support/contact

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 23968-H

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.

7. 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.

8. Tap Pause Options, then select Pause On Button Push to

specify that you can pause the logger by pressing its

Start/Stop 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.

9. 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.

10. 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).

11. Enable or disable Bluetooth Always On. If Bluetooth Always

On is enabled, the logger advertises or regularly sends out a

Bluetooth signal for the phone, tablet, or computer to find

via the app while it is logging, which uses battery power.

When Bluetooth Always On is disabled, the logger only

advertises during logging when you press either button on

the logger to wake it up, thereby preserving as much

battery power as possible.

12. Select whether to upload data to HOBOlink® via the

gateway or the app (optional and requires an active

HOBOlink account).

13. Make sure all channels you want to log are enabled and

then do the following:

•For self-describing sensors, the sensor type is

automatically detected. Tap the sensor if you want to

enter a label, set up alarms, or add scaling.

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

1-508-759-9500 (U.S. and International)

1-800-LOGGERS (564-4377) (U.S. only)

www.onsetcomp.com/support/contact

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 23968-H

•For other external sensors, the sensor type is not

automatically detected. Enable the channel (if necessary)

and then tap it to enter a label (optional). Select the type

of sensor or cable from the list. Set up alarms and add

scaling if needed and then tap Save.

•See Working with External Sensors and Setting up Alarms

for additional details.

14. Tap Start to save the configuration settings.

Logging begins based on the settings you selected. Deploy the

logger using the mounting materials (see Mounting the Logger).

After logging begins, you can download data from the logger at

any time (see Downloading Data From the Logger for details).

Note: If an “Error Configuring Logger” message appears in the

app, an error occurred while loading the configure settings onto

the logger. Try reconfiguring the logger.

Working with External Sensors

The MX1104 has one analog sensor port and the MX1105 has

four analog sensor ports that can accept self-describing and

other external sensors. Refer to www.onsetcomp.com for a

current list of supported sensors.

To connect an external sensor:

1. Make sure the logger is stopped.

2. For self-describing sensors, insert the plug into an analog

sensor port as shown.

3. For other external sensors, insert the sensor into an analog

sensor port and make sure it is firmly seated.

4. If you need to connect a sensor to the sensor cable,

complete any wiring before logging begins. Refer to the

sensor or cable manual for more information on connecting

the sensor and wiring, if applicable.

5. Tap Devices. Press either button on the logger to wake it up

(if necessary).

6. Tap the logger tile in the app to connect to the logger and

tap Configure & Start.

7. Make sure all external sensor channels are enabled.

8. For self-describing sensors, the sensor type is automatically

detected. Tap the Sensor/Channel Name in the app to enter

a label (optional). To set up scaling (if it is present), tap

Scaling and then enter the Series Name, Unit, and values for

High and Low and then tap Save. See Setting up Alarms for

details on adding alarms.

For other external sensors, the sensor type is not

automatically detected. Tap the sensor and enable the

channel (if necessary). Enter a label (optional). Select the

type of sensor or cable from the list. To set up scaling (if it’s

present), tap Scaling and then enter the Series Name, Unit,

and values for High and Low and then tap Save. See Setting

up Alarms for details on adding alarms.

Notes:

•For MX1104 loggers, an external sensor is channel 1. For

MX1105 loggers, the sensor channel number is listed

above the analog sensor port where the external sensor

is connected.

•The configuration screen in the app automatically

updates to show when a sensor is disconnected or

connected.

•Make sure you select the correct sensor type in the app if

you are not using self-describing sensors. If you select the

wrong type, incorrect data is logged. The app

automatically detects the sensor type only for self-

describing sensors.

•If you disconnect a sensor or if it is not fully inserted into

the analog sensor port while the logger is logging, a

warning icon appears on the LCD and the logger beeps

once. Use the top button on the logger to view the

channel with the warning, which also displays dashes

instead of a valid current reading. Erroneous readings are

displayed in the app and logged depending on the

logging interval while the sensor is disconnected (e.g., if a

sensor is disconnected for 5 minutes and the logging

interval is set to 1 minute, there are 5 erroneous data

points while the sensor was disconnected). When the

sensor is reconnected, the warning icon clears, the

correct value replaces the dashes for the channel on the

LCD, and the correct readings are logged.

•Do not swap out sensors or move sensors to empty ports

while the logger is logging. Stop the logger before making

any physical changes to the sensors.

•If a warning icon appears for a self-describing sensor and

you have checked that the correct sensor is properly

installed, the sensor might be faulty. Contact Onset

Technical Support.

•The 4-20mA input cable (SD-MA-420 or CABLE-4-20mA)

measures current from 0 to 20.1 mA. Do not expose it to

current above 20 mA or to negative current. Do not cut

off the end of the gray cable where it connects to the

blue and yellow wires as it contains the precision resistor

required for current measurement.

•If you are using the SD-VOLT-2.5 or CABLE-2.5-STEREO

voltage input cable, the input line must not be exposed

Using the diagram on the

logger housing shown above as

reference, insert the plug into

the analog sensor port.

Turn the plug one-

quarter clockwise.

The flat part of the plug will be

facing up when properly installed.

a. b.

c. d.

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

1-508-759-9500 (U.S. and International)

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www.onsetcomp.com/support/contact

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 23968-H

to signals below 0 V or above 2.5 V. The voltage input

cable connections are as follows:

Wire Connection

Red Switched 2.5 V output

White Voltage input

Black Ground

•The external input channels have a switched 2.5 V

output. This signal can be used to power a sensor directly

or to trigger an external circuit. External sensors should

draw no more than 4 mA total when powered.

The switched 2.5 V output turns on about 5 ms before

the external channels are measured as shown in the

following diagram for an MX1105 logger. The shaded

area shows the 100 ms period for each enabled channel

during which the logger samples the input signals.

When using multiple voltage and/or current inputs, the

(-) from the current source(s) and the 0 V line from the

voltage source(s) are tied together at the logger. If these

lines are at different voltage potentials, this may cause

inaccurate readings or even damage your logger.

WARNING: Analog channel input cannot exceed 2.5

V DC. For sensor outputs up to 24 V DC, use the

appropriate voltage adapter cable (SD-VOLT-xx or

CABLE-ADAPX).

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. Alarms alert

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 the logger 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,

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, 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 the logger to beep 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. Dashes appear instead of a value

once the alarm is cleared on the channel. The logger

checks alarm limits at the same rate as the logging

interval.

•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 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 will start beeping again if

the sensor values go out of the normal range. Even if you

clear an audible alarm, a visual alarm may remain on the

logger LCD and in the app depending on the settings

selected for Show Visual Alarms Until or because the

alarm condition may still be in effect. In addition, an

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

1-508-759-9500 (U.S. and International)

1-800-LOGGERS (564-4377) (U.S. only)

www.onsetcomp.com/support/contact

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 23968-H

audible alarm continues beeping when the sensor values

have returned to the normal range until it is cleared.

•Although an audible alarm and a visual alarm can occur

at the same time when a sensor alarm is tripped, you

clear them 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

Show Visual Alarms 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

bottom button on the logger is pressed--whichever

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

in the data file. 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 other sensors as necessary.

Notes:

•The logger checks burst limits at the same rate as the

logging interval. When the logger enters burst logging

mode, the LCD updates at the same rate as the new burst

logging interval.

•If high and/or low limits are configured for more than

one sensor, burst logging begin 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

range.

•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, let’s assume the

logger has a 10-minute logging interval and logged a data

point at 9:05. 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 was 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

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

•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

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

1-508-759-9500 (U.S. and International)

1-800-LOGGERS (564-4377) (U.S. only)

www.onsetcomp.com/support/contact

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 23968-H

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 either 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 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 bottom button on the logger to

cycle through the current maximum, minimum, average, and

standard deviation data for the current channel displayed 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 both buttons 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 either 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.

To plot events, tap Data and select a file to open.

Tap (if applicable) and then 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.

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

1-508-759-9500 (U.S. and International)

1-800-LOGGERS (564-4377) (U.S. only)

www.onsetcomp.com/support/contact

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 23968-H

Internal Event Name Definition

Started The top button on the logger was pressed to

begin or resume logging.

Stopped The logger received a command to stop

recording data (from the app or by pushing

the top button on the logger).

Chan <#> Alarm

Tripped

A sensor alarm has tripped; <#> is the sensor

number, 1 through 4.

Chan <#> Alarm

Cleared

A sensor alarm has cleared; <#> is the sensor

number, 1 through 4. 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 1.6 V; the

logger performs a safe shutdown.

Mounting the Logger

Use the four magnets on the back of the logger to mount it to a

magnetic surface or insert the tie wraps through the mounting

loops to attach it to other surfaces. Insert a Santoprene plug

into any empty analog sensor ports if necessary.

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.

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. Battery life is 1 year, typical with a

logging interval of 1 minute, but may be extended to 2 years

when the logger is configured with Bluetooth Always On

disabled. 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. 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.

To replace the batteries:

1. Use a Phillips-head screwdriver to unscrew the four screws

on the front of the logger.

2. Carefully separate the top and bottom of the logger

enclosure.

3. Remove any old batteries and insert new batteries

observing polarity.

4. Make sure the rubber seal on the bottom part of the logger

enclosure is clean and free of any debris.

5. Carefully reassemble the logger enclosure and screw in the

four screws.

WARNING: Do not cut open, incinerate, heat above 85°C

(185°F), or recharge lithium batteries. The batteries may

explode if the logger is exposed to extreme heat or conditions

that could damage or destroy the battery cases. 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.

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

1-508-759-9500 (U.S. and International)

1-800-LOGGERS (564-4377) (U.S. only)

www.onsetcomp.com/support/contact

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 23968-H

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 logger must be installed to provide a separation distance of at least 20cm from