Onset MX2200 Data sheet

HOBO® TidbiT® MX Temp 400 (MX2203) and
Temp 5000 (MX2204) Logger Manua

HOBO TidbiT MX Temp loggers measure temperature in streams, lakes, oceans, coastal
habitats, and soil environments. Housed in a protective boot, these rugged loggers are
designed for extended deployments in fresh or salt water at depths up to 400 ft (MX2203) or
5,000 ft (MX2204). The loggers use Bluetooth® Low Energy for wireless communication with a
mobile device and are equipped with an optional water detection feature that automatically
turns Bluetooth advertising off when the logger is submerged in water, thereby preserving
battery power. Using the HOBOmobile® app, you can easily configure the loggers, download
logged data to your phone or tablet, or automatically upload the data to HOBOlink® for further
analysis. You can also configure the loggers to calculate statistics, set up alarms to trip at
specific thresholds, or enable burst logging in which data is logged at a faster interval when
sensor readings are above or below certain limits.

MX2203 Model Shown

HOBO TidbiT MX Temp
Logger

Models:

• MX Temp 400 (MX2203)

• MX Temp 5000

(MX2204)

Items included:

• Protective boot

Required Items:

• HOBOmobile app

• Device with iOS or

Android™ and Bluetooth

Accessories:

• Solar radiation shield
(RS1 or M-RSA) for
MX2203

• Mounting bracket for
solar radiation shield
(MX2200-RS-BRACKET),
for use with MX2203
models

• Replacement O-rings
(MX2203-ORING) for
MX2203

• Replacement boots for
both models in gray
(BOOT-MX220x-GR),
black (BOOT-MX220x­BK), or white (BOOT­MX220x-WH)

Specifications

Temperature Sensor

Range MX2203: -20° to 70°C (-4° to 158°F) in air; -20° to 50°C (-4° to 122°F) in

Accuracy

Resolution 0.01°C (0.018°F)

Drift <0.1°C (0.18°F) per year

Response Time MX2203: 17 minutes typical to 90% in air moving 1 m/s, unmounted;

Logger

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

Buoyancy (Fresh Water) MX2203: 3.1 g (0.11 oz) negative

Waterproof MX2203: To 122 m (400 ft)

Water Detection Water conductivity level of 100 µS/cm or greater necessary for reliable

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 CR2477 3V lithium, user replaceable in MX2203, non-replaceable in

Battery Life 3 years, typical at 25°C (77°F) with logging interval of 1 minute and

Memory 96,000 measurements

l

water

MX2204: -20° to 70°C (-4° to 158°F) in air; -20° to 50°C (-4° to 122°F) in
water, maximum sustained temperature in water 30°C (86°F)

±0.25°C from -20° to 0°C (±.45°F from -4° to 32°F)
±0.2°C from 0° to 70°C (±0.36°F from 32° to 158°F)

7 minutes typical to 90% in stirred water, unmounted
MX2204: 15 minutes typical to 90% in air moving 1 m/s, unmounted;
4 minutes typical to 90% in stirred water, unmounted

MX2204: 7.6 g (0.27 oz) negative

MX2204: To 1,524 m (5,000 ft)

detection of water. Deionized water or water below 100 µS/cm may not
be detected.

The water conductivity circuit may not reliably detect water that has
frozen around the electrodes, i.e. below 0°C (32°F).

MX2204

Bluetooth Always Off disabled in software.

5 years, typical at 25°C (77°F) with logging interval of 1 minute and
Bluetooth Always Off or Bluetooth Off Water Detect enabled in software.

Faster logging intervals and statistics sampling intervals, burst logging,
remaining connected with the app, excessive downloads, and paging may
impact battery life.

To ensure proper battery installation, see Battery Information for detailed
instructions on replacing the battery in the MX2203 logger.

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HOBO TidbiT MX Temp 400 (MX2203) and Temp 5000 (MX2203) Logger Manual

W

Specifications (continued)

Full Memory Download
Time

Wetted Materials MX2203: Polypropylene case, EPDM O-ring, stainless steel screws,

Dimensions MX2203: 4.45 x 7.32 x 3.58 cm (1.75 x 2.88 x 1.41 inches)

eight MX2203: 36.2 g (1.28 oz)

Logger Components and Operation

Protective
Boot

Status LED

Magnetic

Start Button

Mounting Tab

Reed Switch (Internal)

MX2204 MX2203

Protective Boot: This waterproof cover protects the logger

during deployment. It has two mounting tabs and a built-in
magnet to use with the logger’s internal reed switch (see
Deploying and Mounting the Logger).

Magnetic Start Button: This button is functional when the
logger is inside the protective boot. Press this button for 3
seconds to start or stop the logger when it is configured to start
or stop “On Button Push” (see Configuring the Logger). Press
this button for 1 second to wake up the logger (if configured
with Bluetooth Always Off as described in Configuring the
Logger). You may need to press the button a second time to
wake up the logger if it is logging every 5 seconds or faster and
the temperature is -10°C (14°F) or below.

Mounting Tab: Use the tabs at the top and bottom of the
logger to mount it (see Deploying and Mounting the Logger).

Reed Switch: The logger has an internal reed switch
represented by the dotted rectangle on the logger. The reed
switch is used in conjunction with the magnetic button in the
protective boot. When the logger is removed from the boot, a
magnet placed over the reed switch can substitute for the built­in button (see Deploying and Mounting the Logger).

Water Detection Screws: These two screws can detect the
presence of water. This allows you to configure the logger in
power-saving mode in which Bluetooth advertising is active
only when the logger is removed from water. See Configuring
the Logger for details. Note: The logger will check for the

Alarm LED

Temperature
Sensor
(Internal)

Water-Detection
Screws

Approximately 45 seconds; may take longer the farther the device is from
the logger

Santoprene® (TPE) boot
MX2204: Epoxy case, Santoprene (TPE) boot

MX2204: 4.06 x 6.99 x 3.51 cm (1.6 x 2.75 x 1.38 inches)

MX2204: 32.8 g (1.16 oz)

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

See last page

presence of water every 15 seconds when the Bluetooth Off
Water Detect power-saving mode is selected.

Temperature Sensor: The internal temperature sensor (not
visible in the diagram) is located on upper right side of the
logger.

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. Both this LED
and the Alarm LED will blink once when you press the button to
wake up the logger or will blink four times when you press the
button to start or stop logging. If you select Page Logger LED in
the HOBOmobile app, both LEDs will be illuminated for 5
seconds.

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).

Getting Started

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

1. Download the HOBOmobile app from the App Store® or
Google Play™.

2. Open the app and enable Bluetooth in the device settings if
prompted.

3. Tap the HOBOs icon at the bottom of the screen. Tap the
logger in the list to connect to it.

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

• If the logger was configured with Bluetooth Always Off

(see Configuring the Logger), make sure the logger is
“awake” by pressing the magnetic start button for 1
second. The alarm and status LEDs will blink once when
the logger wakes up. This will also bring the logger to the
top of the list if you are working with multiple loggers. If

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the logger is currently logging at a fast interval (5 seconds
or faster) and the temperature is -10°C (14°F) or below,
you may need to press the button twice before it appears
in the list.

• Make sure the logger is within range of your mobile
device. The range for successful wireless communication
in air is approximately 30.5 m (100 ft) with full line-of­sight.

• Change the orientation of your phone or tablet to ensure
the antenna in your device is pointed toward the logger.
Obstacles between the antenna in the device and the
logger may result in intermittent connections.

• If the logger is in water and configured with Bluetooth
Off Water Detect, you must remove the logger from the
water to connect to it.

• 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 is in water, the connection
can be unreliable. Remove it from water for a consistent
connection.

• 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.

that option is available) to continue updating the
firmware.

Important: Before updating the firmware on the
logger, 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.

• 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
it.

Configuring the Logger

Use HOBOmobile to set up the logger, including selecting the
logging interval, start and stop logging options, and configuring
alarms. These steps provide an overview of setting up the
logger. For complete details, see the HOBOmobile User’s Guide.

1. Open HOBOmobile and tap the HOBOs icon.

2. Find the logger in the list and tap it to connect to it. If the
logger was previously configured with Bluetooth Always
Off, press the button on the logger to wake it up. If the
logger was previously configured with Bluetooth Off Water
Detect and it is deployed in water, remove it from water. If
you are working with multiple loggers, pressing the button
also brings the logger to the top of the list (and the logger
name will turn green). Note that the current sensor
readings are displayed even when the logger is not logging.

3. Once connected, tap Configure.

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

configuration settings currently selected for the logger.

• Start Logging. Start recording data (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 5 seconds.

• Logger Password. 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. A logger readout
will be completed automatically at the beginning of the
firmware update process. If the connection is lost
between the logger and the mobile device during the
firmware update, a Firmware Update Pending Status
displays for the logger in the HOBOs list. Connect to the
logger and select Restore Logger (or Update Firmware if

4. Tap Name and type a name for the logger up to 20
characters (optional). Tap Done. If no name is selected, the
logger serial number is used as the name.

5. Tap Group to add the logger to the Favorites group, an
existing custom group, or create a new group name up to
20 characters (optional). Tap Done.

6. Tap Logging Interval and choose how frequently the logger
will record data.

7. Tap Start Logging and select when logging will begin:

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HOBO TidbiT MX Temp 400 (MX2203) and Temp 5000 (MX2203) Logger Manual

• Now. Logging will begin immediately after tapping Start

in the Configure screen.

• On Next Logging Interval. Logging will begin at the next

even interval as determined by the selected logging
interval.

• On Button Push. Logging will begin once you press the

button on the logger for 3 seconds.

• On Date/Time. Logging will begin at a date and time you

specify. Select the Date and time and tap Done.

Tap Done in the Start Logging screen.

8. Tap Stop Logging and select the options for when logging
will end.

a. Choose one of two memory options:

• When Memory Fills. The logger will continue recording

data until the memory is full.

• Never (Wrap When Full). The logger will continue

recording data indefinitely, with newest data
overwriting the oldest.

b. Select On Button Push if you want to be able to stop

logging by pushing the button on the logger for 3
seconds. Note that if you also choose On Button Push for
the Start Logging option, then you will not be able to stop
logging until 30 seconds after logging begins.

c. Select one of the following time options for when to stop

logging:

12. Select the power saving mode, which determines when the
logger will “advertise” or regularly send out a Bluetooth
signal for the phone or table to find via HOBOmobile.

• Bluetooth Always Off. The logger will only advertise

during logging when you press the button on the
protective boot (or place a magnet where the reed
switch is located if the logger is out of the protective
boot). This will wake up the logger when you need to
connect to it. This option uses the least battery power.

• Bluetooth Off Water Detect. The logger will not

advertise when the presence of water is detected. Once
the logger is removed from the water, advertising will
automatically turn on, thereby not requiring you to push
a button (or use a magnet) to wake up the logger when
you need to connect to it. This option preserves some
battery power. Note: The logger will check for the
presence of water every 15 seconds when this is option is
selected.

• Bluetooth Always On. The logger will always advertise.

You will never need to push a button (or use a magnet)
to wake up the logger. This option uses the most battery
power.

13. Tap Start in the upper right corner of the Configure screen
to load the settings onto the logger.

• Never. Select this if you do not want the logger to stop

at any predetermined time frame.

• On Date/Time. Select this if you want the logger to

stop logging on a specific date and time. Select the
date and time and then tap Done.

• 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
and then tap Done. For example, select 30 days if you
want the logger to log data for 30 days after logging
begins.

d. Tap Done in the Stop Logging screen.

9. You can set up alarms to trip when a sensor reading rises
above or falls below a specified value. See Setting up Alarms
for details on enabling sensor alarms.

10. Tap Logging Mode. Select either fixed interval logging or
burst logging. With fixed interval 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. Tap Done.

11. Enable or disable Show LED. If Show LED is disabled, the
alarm and status LEDs on the logger will not be illuminated
while logging (the alarm LED will not blink if an alarm trips).
You can temporarily turn on LEDs when Show LED is
disabled by pressing the button on the logger for 1 second.

Logging will begin based on the settings you selected. See
Deploying and Mounting the Logger for details on mounting
and see Reading Out the Logger for details on downloading.

Setting up Alarms

You can set up alarms for the logger so that if a sensor reading
rises above or falls below a specified value, the logger alarm
LED will blink and an alarm icon will appear in the app. This can
alert you to problems so you can take corrective action.

To set an alarm:

1. Tap the HOBOs icon and tap the logger to connect to it. If
the logger was configured with Bluetooth Always Off
enabled, press the HOBOs button on the logger to wake it
up. If the logger was configured with Bluetooth Off Water
Detect and is currently underwater, remove it from the
water.

2. Once connected, tap Configure.

3. In Sensor & Alarm Setup, tap an enabled sensor.

4. Enable the High Alarm if you want an alarm to trip when the
sensor reading rises above the high alarm value. Drag the
slider to the reading that will trip the alarm or tap the value
field and type a specific reading. In the example, an alarm
will trip when the temperature rises above 85°F.

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HOBO TidbiT MX Temp 400 (MX2203) and Temp 5000 (MX2203) Logger Manual

• The actual values for the high and low alarm limits are set

to the closest value supported by the logger. For
example, the closest value to 85°F that the logger can
record is 84.990°F. In addition, alarms can trip or clear
when the sensor reading is within the specified
resolution. This means the value that triggers the alarm
may differ slightly than the value entered. For example, if
the High Alarm is set to 75.999°F, the alarm can trip
when the sensor reading is 75.994°F, which is within the
range of the resolution specifications.

• When you read out the logger, alarm events can be

displayed on the plot or in the data file. See Logger

5. Enable the Low Alarm if you want an alarm to trip when the
sensor reading falls below the low alarm value. Drag the
slider to the reading that will trip the alarm or tap the value
field and type a specific reading. In the example, an alarm is
configured to trip when the temperature falls below 32°F.

6. Under Raise Alarm After, select the duration before an
alarm is tripped and tap Done in the Alarm Duration screen.

7. Select either Cumulative or Consecutive Samples. If you
select Cumulative Samples, then the alarm will trip when
the time the sensor is out of range over the course of the
deployment is equal to the selected duration. If you select
Consecutive Samples, then the alarm will trip when the
time the sensor is continuously out of range is equal to the
selected duration. For example, the high alarm for
temperature is set to 85°F and the duration is set to 30
minutes. If Cumulative is selected, then an alarm will trip
once a sensor reading has been at or above 85°F for a total
of 30 minutes since the logger was configured; specifically,
this could be 15 minutes above 85°F in the morning and
then 15 minutes above 85°F again in the afternoon. If
Consecutive is selected, then an alarm will trip only if all
sensor readings are 85°F or above for a continuous 30­minute period.

8. Tap Done.

9. Back in the Configure screen, select one of the following
options to determine how the alarm indications are cleared:

• Logger Reconfigured. The alarm indication will display

until the next time the logger is reconfigured.

• Sensor in Limits. The alarm indication will display until

the sensor reading returns to the normal range between
any configured high and low alarm limits.

10. Tap Start in the Configure screen to load the alarm settings
onto the logger if you are ready to start.

When an alarm trips, the logger alarm LED blinks every 4
seconds (unless Show LED is disabled), an alarm icon appears in
the app, and an Alarm Tripped event is logged. The alarm state
will clear when the readings return to normal if you selected
Sensor in Limits in step 9. Otherwise, the alarm state will
remain in place until the logger is reconfigured.

Events.

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 will record
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 will switch to the faster logging rate and record
data every 30 seconds until the temperature falls back to 85°F.
At that time, logging then resumes every 5 minutes at the
normal logging interval. Similarly, if the temperature falls below
32°F, then the logger would switch to burst logging mode again
and record data every 30 seconds. Once the temperature rises
back to 32°F, the logger will then return to normal mode,
logging every 5 minutes. Note: Sensor alarms, statistics, and the
Stop Logging option “Wrap When Full” are not available in
burst logging mode.

To set up burst logging:

1. Tap the HOBOs icon and tap the logger to connect to it. If
the logger was configured with Bluetooth Always Off
enabled, press the HOBOs button on the logger to wake it
up. If the logger was configured with Bluetooth Off Water
Detect and is currently underwater, remove it from the
water.

2. Once connected, tap Configure.

3. Tap Logging Mode and then tap Burst Logging.

4. Tap the temperature sensor under Burst Sensor Limits.

5. Enable High Limit if you want burst logging to occur when
the sensor reading rises above a specific reading. Drag the
slider to the reading that will trigger burst logging or tap the
value field and type a specific reading. In the example, the
logger will switch to burst logging when the temperature
rises above 85°F.

Notes:

• Alarm limits are checked at every logging interval. For
example, if the logging interval is set to 5 minutes, then
the logger will check the sensor readings against your
configured high and low alarm setting every 5 minutes.

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6. Enable Low Limit if you want burst logging to occur when
the sensor reading falls below a specific reading. Drag the
slider to the reading that will trigger burst logging or tap the
value field and type a specific reading. In the example, the
logger will switch to burst logging when the temperature
falls below 32°F.

7. Tap Done.

8. Tap Burst Logging Interval and select an interval 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.
Tap Done.

9. Tap Done to exit the Logging Mode screen.

10. Tap Start in the Configure screen to load the burst settings
onto the logger if you are ready to start.

Notes:

• The high and low burst limits are checked at the burst

logging interval rate whether the logger is in normal or
burst condition. For example, if the logging interval is set
to 1 hour and the burst logging interval is set to 10
minutes, the logger will always check for burst limits
every 10 minutes.

• The actual values for the burst logging limits are set to

the closest value supported by the logger. For example,
the closest value to 85°F that the logger can record is

84.990°F.

• Burst logging can begin or end when the sensor reading is

within the specified resolution. This means the value that
triggers burst logging may differ slightly than the value
entered. For example, if the high limit for a temperature
alarm is set to 75.999°F, burst logging can start when the
sensor reading is 75.994°F, which is within the range of
the resolution specifications.

• Once the high or low condition clears, the logging

interval time will be calculated using the last recorded
data point in burst logging mode, not the last data point
recorded at the normal logging rate. For example, the
logger has a 10-minute logging interval and logged a data
point at 9:05. Then, the high limit was surpassed and
burst logging began at 9:06. Burst logging then continued
until 9:12 when the sensor reading fell back below the
high limit. Now back in normal mode, the next logging
interval will be 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, then a New Interval event is automatically
logged and the burst condition is cleared, even if the
actual high or low condition has not cleared.

Statistics Logging

During fixed interval logging, the logger records data for the
temperature sensor 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. The following statistics can be logged:

• The maximum, or highest, sampled value,

• The minimum, or lowest, sampled value,

• An average of all sampled values, and

• The standard deviation from the average for all sampled

values.

For example, the logging interval is 5 minutes. The logging
mode is set to fixed interval logging with Normal and all four
statistics enabled, and with a statistics sampling interval of 30
seconds. Once logging begins, the logger will measure and
record the actual temperature values every 5 minutes. In
addition, the logger will take a temperature sample every 30
seconds and temporarily store them in memory. The logger will
then calculate the maximum, minimum, average, and standard
deviation using the samples gathered over the previous 5­minute period and log the resulting values. When reading out
the logger, this would result in five data series: one
temperature series (with data logged every 5 minutes) plus four
maximum, minimum, average, and standard deviation series
(with values calculated and logged every 5 minutes based on
the 30-second sampling).

To log statistics:

1. Tap the HOBOs icon and tap the logger to connect to it. If
the logger was configured with Bluetooth Always Off
enabled, press the HOBOs button on the logger to wake it
up. If the logger was configured with Bluetooth Off Water
Detect and is currently underwater, remove it from the
water.

2. Once connected, tap Configure.

3. Tap Logging Mode and then select Fixed Interval Logging.

4. Select Normal to record the current reading for the
temperature sensor at the logging interval shown at the top
of the screen. Do not select this if you only want to log
statistics.

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 will be logged for all
enabled sensors. In addition, the more statistics you record,
the shorter the logger duration and the more memory is
required.

6. Tap Statistics Sampling Interval and select the rate 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, then the logger will take 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

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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.

7. Tap Done.

8. Tap Done again to exit the Logging Mode screen.

9. Tap Start in the Configure screen to load the statistics
settings onto the logger if you are ready to start.

Setting a Password

You can create an encrypted password for the logger that will
be required if another phone or tablet 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 the HOBOs icon and connect to the logger.

2. Tap Logger Password.

3. Type a password up to 10 characters.

4. Tap Save.

Only the phone or tablet used to set the password can then
connect to the logger without entering a password; all other
mobile devices will be 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 device later with your phone,
you will be required to enter the password on the phone but
not with your tablet. Similarly, if others attempt to connect to
the logger with different devices, then they would also be
required to enter the password. To reset a password, connect
to the logger, tap Set Logger Passkey, and select Reset to
Factory Default or press the button on the logger for 10
seconds.

Reading Out the Logger

To download data from the logger:

1. Open HOBOmobile.

2. If the logger was configured with Bluetooth Always On,
continue to step 3.

If the logger was configured with Bluetooth Always Off,
press the button on the logger for 1 second to wake it up.

If the logger was configured with Bluetooth Water Detect
and it is deployed in water, remove it from the water.

3. Tap the HOBOs icon and tap the logger to connect to it.

4. Once connected, tap Readout.

5. Tap the Data Files icon to view a mini-graph of the
downloaded data.

6. Tap the mini-graph to view a larger version of the graph or
to share the file. See the HOBOmobile User’s Guide for
details on viewing graphs and sharing data.

Data can also be uploaded automatically to HOBOlink, Onset’s
web-based software. Tap the Settings icon to enable the
HOBOlink Upload Data option (this requires a HOBOlink

account at www.hobolink.com). See the HOBOmobile User’s
Guide for more details on this setting and see the HOBOlink
Help for details on working with data in HOBOlink.

Logger Events

The logger records the following events to track logger
operation and status. To plot events in HOBOmobile, tap a

mini-graph and then tap . Select the events you wish to plot

and then tap again. You can also view events in shared or
exported data files.

Event Name Definition

Host Connect The logger was connected to a mobile

Started The logger started logging.

Stopped The logger stopped logging.

Alarm
Tripped/Cleared

Button Up/Down The button on the logger was pressed to

New Interval The logger has switched to logging at the

Water Detect The logger has been placed in water or

Power Warn The battery level dropped below 2.3 V.

Safe Shutdown The battery level dropped below a safe

device.

An alarm has occurred because the reading
was outside the alarm limits or back within
range. Note: Although the reading may
return to a normal range, an alarm cleared
event will not be logged if the logger was
set up to maintain alarms until
reconfigured.

wake it up/bring it to the top of the loggers
list in HOBOmobile.

burst logging rate or back to the normal
rate.

removed from water.

operating voltage and performed a safe
shutdown.

Deploying and Mounting the Logger

Follow these guidelines for deploying and mounting the logger.

• You can deploy the logger by using the two mounting
tabs on the protective boot. Insert two screws through
the holes on the mounting tabs to affix the logger to a
flat surface. Insert cable ties through the rectangular
holes on both mounting tabs to attach the logger to a
pipe or pole.

Use cable ties with
the rectangular holes

Use screws with
the round holes

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HOBO TidbiT MX Temp 400 (MX2203) and Temp 5000 (MX2203) Logger Manual

• Use nylon cord or other strong cable with any of the
holes on the mounting tabs. If wire is used to secure the
logger, make sure the wire loop is snug to the holes. Any
slack in the loop may cause excessive wear.

• When deploying in water, the logger should be
appropriately weighted, secured, and protected
depending on water conditions and desired
measurement location.

• If the TidbiT MX Temp 500 (MX2203) logger will be
exposed to sunlight in the deployment location, attach it
to a solar radiation shield (RS1 or M-RSA) using the solar
radiation shield bracket (MX2200-RS-BRACKET). Attach
the logger to the underside of the mounting plate as
shown. For more details on the solar radiation shield,
refer to the Solar Radiation Shield Installation Guide at
www.onsetcomp.com/manuals/rs1.

• Be careful of solvents. Check a materials compatibility
chart against the wetted materials listed in the
Specifications table before deploying the logger in
locations where untested solvents are present. The
TidbiT MX Temp 500 (MX2203) logger has an EPDM O­ring, which is sensitive to polar solvents (acetone, keton),
and oils.

• The protective boot is designed with a magnetic button
that will interact with the reed switch located inside the
logger. This means you do not need to remove the boot
to start, stop, or wake up the logger (if On Button Push or
Bluetooth Always Off configuration settings have been
selected). If you remove the logger from the boot, you
must place a magnet on the logger where the reed switch
is located if you want to start or stop the logger with a
button push or wake the logger up. Leave the magnet in
place for 3 seconds to start or stop it or 1 second to wake
it up.

• Periodically inspect the logger for biofouling if it is
deployed in water and clean as described above.

• Periodically inspect the O-ring on the inside of the

battery cover in the TidbiT MX Temp 400 (MX2203)
logger for cracks or tears and replace it if any are
detected (MX2203-ORING). See Battery Information for
steps on replacing the O-ring.

• Periodically inspect the boot for any cracks or tears and
replace it if necessary (BOOT-MX220x-XX).

Protecting the Logger

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
www.onsetcomp.com.

Battery Information

The logger requires one CR2477 3V lithium battery (HRB-2477),
which is user-replaceable for the TidbiT MX Temp 400
(MX2203) and non-replaceable for the TidbiT MX Temp 5000
(MX2204). Battery life is 3 years, typical at 25°C (77°F) with a
logging interval of 1 minute and Bluetooth Always On selected
or 5 years, typical at 25°C (77°F)
with Bluetooth Always Off or Bluetooth Off Water Detect
selected. Expected battery life varies based on the ambient
temperature where the logger is deployed, the logging interval,
the frequency of connections, downloads, and paging, and the
use of burst mode or statistics logging. Deployments in
extremely cold or hot temperatures or a logging interval faster
than 1 minute can impact battery life. Estimates are not
guaranteed due to uncertainties in initial battery conditions and
operating environment.

To replace the battery in the TidbiT MX Temp 400 (MX2203)
logger:

1. Remove the logger from the boot.

2. While pushing down on the back of the logger, rotate the
cover counterclockwise.

3. Use the small tab on the cover to lift it off the logger.

when the logger is configured

Place a magnet
here to act as a
button when the
logger is removed
from the boot

Use this tab to
lift the cover off

Maintaining the Logger

• To clean the logger, remove the logger from the boot.
Rinse both the logger and the boot it in warm water. Use
a mild dishwashing detergent if necessary. Do not use
harsh chemicals, solvents, or abrasives.

4. Remove the battery and place a new one in the battery
holder, positive side facing up.

5. Inspect the O-ring on the battery cover. Make sure it is
clean and seated properly. Remove any dirt, lint, hair, or
debris from the O-ring. If the O-ring has any cracks or tears,
replace it as follows:

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HOBO TidbiT MX Temp 400 (MX2203) and Temp 5000 (MX2203) Logger Manual

a. Spread a small dot of silicone-based grease on the O-

ring with your fingers, making sure the entire O-ring
surface is completely covered in grease.

b. Place the O-ring on the cover and clean off any debris.

Make sure the O-ring is fully seated and level in the
groove and not pinched or twisted. This is necessary to
maintain a waterproof seal.

6. Place the cover back on the logger. Make sure the cover is
level as it is placed on the logger case to ensure the battery
terminal maintains its proper position.

Place cover
straight down and
level on the back
of the logger

Battery Covery Placement Top View

8. Place the logger back in the protective boot, making sure
the ridge in the logger case slides into the groove on the
inside of the boot.

Make sure this ridge on the logger
slides into this groove on the boot

Note: MX2203 logger is shown in the example; the groove in
the boot on an MX2204 logger is in a slightly different location.

(185°F), or recharge the lithium battery. The battery may
explode if the logger is exposed to extreme heat or conditions
that could damage or destroy the battery case. Do not dispose

Battery Cover Side View,

Incorrect Assembly

Battery Cover Side View,

Correct Assembly

7. While pushing down on the cover, rotate it clockwise until

of the logger or battery in fire. Do not expose the contents of
the battery to water. Dispose of the battery according to local
regulations for lithium batteries.

the edges are aligned. When the cover is properly
positioned, the tab will be aligned with the ridge in the
logger as shown.

Cover aligned properly

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

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HOBO TidbiT MX Temp 400 (MX2203) and Temp 5000 (MX2203) Logger Manual

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
all persons and must not be co-located or operating in conjunction with any other antenna or transmitter.

© 2017 Onset Computer Corporation. All rights reserved. Onset, HOBO, TidbiT, HOBOmobile, and HOBOlink are
registered trademarks of Onset Computer Corporation. App Store is a service mark of Apple Inc. Android and

1-800-LOGGERS (564-4377) • 508-759-9500
www.onsetcomp.com/support/contact

Google Play are trademarks or registered trademarks of Google Inc. Bluetooth and Bluetooth Smart is a registered
trademark of Bluetooth SIG, Inc. All other trademarks are the property of their respective companies.
Patent #: 8,860,569 21537-B