Onset MX100 Operating Manual

HOBO® MX100 Temp Logger Manual

Temperature Sensor

Range

-30° to 70°C (-22° to 158°F)

Accuracy

±1.0°C from -30° to -5°C (±1.8°F from -22° to 23°F)
±0.5°C from -5° to 50°C (±0.9°F from 23° to 122°F)
±1.0°C from 50° to 70°C (±1.8°F from 122° to 158°F)

Resolution

0.04°C (0.072°F)

Drift

<0.01°C (0.018°F) per year

Response Time

6 minutes typical to 90% in open air moving 1 m/s, unmounted

Logger

Logger Operating Range

-30° to 70°C (-22° to 158°F)

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)

Logging Rate

1 second to 18 hours

Time Accuracy

±1 minute per month at 25°C (77°F)

Battery

CR2450 3V lithium, not replaceable

Battery Life

1 year, typical with logging interval of 1 minute and Power Saving Mode
disabled; 2 years, typical with logging interval of 1 minute and Power
Saving Mode enabled. Faster logging intervals, remaining connected with
the app, excessive downloads, and paging may impact battery life.

Memory

30,000 measurements

Full Memory Download
Time

Approximately 30 seconds; may take longer the farther the device is
from the logger

Dimensions

6.9 x 4.5 x 1.1 cm (2.71 x 1.76 x 0.42 inches)

Weight

25.5 g (0.90 oz)

Environmental Rating

IP67

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

See last page

HOBO MX100
Temp Logger

Required Items:

 HOBOmobile app
 Device with iOS and

Bluetooth

The HOBO MX100 Temp logger measures temperature in indoor environments. With an IP67
environmental rating, the logger can be deployed in indoor locations where moisture may
form. 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 automatically upload the data to HOBOlink® for
further analysis. The logger has a built-in alarm you can configure to trip at thresholds you
specify. Designed with a non-replaceable lithium battery, this logger also has a power-saving
mode that allows you to use the Bluetooth signal only when needed to maximize battery life.

Specifications

Passed RTCA DO160G, part 21H

20813-B

HOBO MX100 Temp Logger Manual

Alarm LED

Status LED

Mounting
Loop

Start Button

Logger Components and Operation

Mounting Loop: Use this when deploying the logger by tying it

to an object.

Alarm LED: This LED blinks red every 4 seconds when an alarm
is tripped (unless Show LED is disabled as described in
Configuring the Logger). Both this LED and the status LED will
blink once when you press the start button to wake up the
logger before configuring it. If you select Page Logger LED in the
HOBOmobile app, both LEDs will be illuminated for 4 seconds.

Status LED: This LED blinks green every 4 seconds when the
logger is logging (unless Show LED is disabled as described in
Configuring the Logger). If the logger is waiting to start logging

because it was configured to start “On button push” or with a

delayed start, it will blink green every 8 seconds.

Start Button: Press this button for 1 second to wake up the

logger; both the alarm and status LEDs will blink. Once the
logger is awake, press this button for 1 second to move it to the
top of the loggers list in HOBOmobile. Press this button for 4
seconds to start or stop the logger when it is configured to start
or stop “On button push” (see Configuring the Logger). Both
LEDs will blink four times when you press the button to start or
stop logging. Press this button for 10 seconds to reset a
password.

Downloading HOBOmobile and
Connecting to a Logger

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

1. Download the HOBOmobile app from the App Store®.

2. Press the button on the logger to wake it up.

3. Open the app and enable Bluetooth in the device settings if

prompted.

4. Tap the HOBOs icon at the bottom of the screen. Tap the

logger in the list to connect to it.

second time to bring it to the top of the list if you are
working with multiple loggers.

 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 list, but you cannot connect

to it, close HOBOmobile and power cycle the mobile
device. This forces the previous Bluetooth connection to
close.

Once the logger is connected, you can select one of the
following actions:

 Configure. Select logger settings and load them onto the

logger to start logging. See Configuring the Logger.

 Readout. Download logger data. See Reading Out the

Logger.

 Full Status Details. Check the battery level and view the

configuration settings currently selected for the logger.

 Start Logging. Select this option to begin logging (if the

logger is configured to start “On Button Push” as

described in Configuring the Logger).

 Stop Logging. Stop the logger from recording data. This

overrides any other Stop Logging settings that may be
configured.

 Page Logger LED. Press and hold this option to illuminate

the alarm and status LEDs for 4 seconds.

 Logger Password. Select this to create a password for the

logger that will be required if another mobile device
attempts to connect to it. To reset a password, connect
to the logger, tap Set Logger Passkey, and select Reset to
Factory Default. You can also press the button on the
logger for 10 seconds to reset the password.

 Update Firmware. When new logger firmware is

available, this action appears in the list. Select it and
follow the instructions on the screen. Note that if there is
a communication failure during the firmware update
process, the logger will revert to the previous firmware.

Important: Before updating the firmware on the
logger, always read out the logger first. Check the
remaining battery level by selecting Full Status Details
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.

If the logger does not appear in the list or if it is having
trouble connecting, follow these tips.

 Make sure the logger is “awake” by pressing the start

button. The alarm and status LEDs will blink once when
the logger wakes up. You can also press the button a

1-800-LOGGERS 2 www.onsetcomp.com

 Force Offload. This may appear if an error was

encountered when loading configure settings. Select this
to offload all the data on the logger before reconfiguring
the logger.