Hobo Mx2300 series User manual

HOBO® MX2300 Series Data Logger Manual

20923-L

The HOBO MX2300 series data loggers record and transmit temperature and/or relative

humidity (RH) in outdoor or indoor environments. These Bluetooth® Low Energy-enabled

loggers are designed for wireless communication with a mobile device. Using the

HOBOconnect™ app, you can easily configure the logger, read it out, and view data on your

phone or tablet, or export the data for further analysis. The logger can calculate minimum,

maximum, average, and standard deviation statistics and be configured to indicate alarms at

thresholds you specify. The logger also supports burst logging in which data is logged at a faster

interval when sensor readings are above or below certain limits. The Temp and Temp/RH

models have internal sensors while the External Temp/RH, External Temp, and 2x External

Temp include built-in external sensors, offering a wide range of solutions for monitoring

temperature and RH in numerous applications.

Specifications

Temperature Sensor

Range MX2301A and MX2305 internal sensors: -40 to 70°C (-40 to 158°F)

MX2302A external temperature sensor: -40 to 70°C (-40 to 158°F)

MX2303 and MX2304 external sensors: -40 to 100°C (-40 to 212°F), with

tip and cable immersion in fresh water up to 50°C (122°F) for one year

Accuracy ±0.25°C from -40 to 0°C (±0.45 from -40 to 32°F)

±0.2°C from 0 to 70°C (±0.36 from 32 to 158°F)

±0.25°C from 70 to 100°C (±0.45 from 158 to 212°F), MX2303 and

MX2304 only

Resolution MX2301A and MX2302A: 0.02°C (0.036°F)

MX2303, MX2304, and MX2305: 0.04°C (0.072°F)

Drift <0.01°C (0.018°F) per year

Relative Humidity Sensor* (MX2301A, MX2302A only)

Range 0 to 100% RH, -40° to 70°C (-40° to 158°F); exposure to conditions

below -20°C (-4°F) or above 95% RH 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% RH and above 90% RH ±5% typical

Resolution 0.01%

Drift <1% per year typical

Response Time (typical, to 90% of change)

Temperature Without Solar

Radiation Shield

With RS1/M-RSA

Solar Radiation Shield

With RS3-B Solar

Radiation Shield

MX2301A

internal sensor

17 minutes in air

moving 1 m/sec

24 minutes in air

moving 1 m/sec

MX2302A

external sensor

3 minutes, 45 seconds

in air moving 1 m/sec

7 minutes, 45

seconds in air

moving 1 m/sec

6 minutes, 30

seconds in air

moving 1 m/sec

MX2303/MX2304

external sensors

3 minutes in air

moving 1 m/sec; 20

seconds in stirred

water

7 minutes in air

moving 1 m/sec

4 minutes in air

moving 1 m/sec

MX2305

internal sensor

17 minutes in air

moving 1 m/sec

24 minutes in air

moving 1 m/sec

RH Without Solar

Radiation Shield

With RS1/M-RSA

Solar Radiation Shield

With RS3-B Solar

Radiation Shield

MX2301A

internal sensor

30 seconds in air

moving 1 m/sec

40 seconds in air

moving 1 m/sec

MX2302A

external sensor

15 seconds in air

moving 1 m/sec

30 seconds in air

moving 1 m/sec

30 seconds in air

moving 1 m/sec

HOBO MX2300 Series

Data Logger

Models:

•MX2301A, temp/RH

•MX2302A, ext temp/RH

•MX2303, 2 ext temp

•MX2304, ext temp

•MX2305, temp

Included Items:

•Screws

•Cable ties

Required Items:

•HOBOconnect app

•Mobile device with

Bluetooth and iOS,

iPadOS®, or Android™

Accessories:

•Solar radiation shield

(RS3-B for use with

MX2302A, MX2303, and

MX2304 models; RS1 or M-

RSA for use with MX2301A

and MX2305 models)

•Mounting bracket for solar

radiation shield (MX2300-

RS-BRACKET), for use with

MX2301A and MX2305

models

•Replacement battery

(HRB-2/3AA)

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Specifications (continued)

Logger

Operating Range -40° to 70°C (-40° 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

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

Time Accuracy ±1 minute per month 0° to 50°C (32° to 122°F)

Battery Type 2/3 AA 3.6 Volt lithium, user replaceable

Battery Life 2 years, typical with logging interval of 1 minute and Bluetooth Always

On enabled; 5 years, typical with logging interval of 1 minute and

Bluetooth Always On disabled. Faster logging intervals and statistics

sampling intervals, burst logging, remaining connected with the app,

excessive downloads, and paging may impact battery life.

Memory MX2301A and MX2302A: 128 KB (63,488 measurements, maximum)

MX2303, MX2304, and MX2305: 128 KB (84,650 measurements,

maximum)

Full Memory Download Time Approximately 60 seconds; may take longer the further the device is

from the logger

Dimensions Logger housing: 10.8 x 5.08 x 2.24 cm (4.25 x 2.0 x 0.88 in.)

External temperature sensor diameter: 0.53 cm (0.21 in.)

External temperature/RH sensor diameter: 1.17 cm (0.46 in.)

External sensor cable length: 2 m (6.56 ft)

Solar radiation shield bracket: 10.8 x 8.3 cm (4.25 X 3.25 in.)

Weight Logger: 75.5 g (2.66 oz)

Solar radiation shield bracket: 20.4 g (0.72 oz)

Materials Acetal, silicone gasket, stainless steel screws

Environmental Rating NEMA 6 and IP67

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

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Logger Components and Operation

Mounting Holes: Use the holes at the top and bottom of the

logger to mount it (see Deploying and Mounting the Logger).

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).

Status LED: This LED blinks blue 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 every 8 seconds.

Start Button: Press this button to wake up the logger; both the

alarm and status LEDs will blink. Once the logger is awake,

press this button to move it to the top of the devices list in the

app. 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). 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 (see Setting a Password).

External Sensor: This is the external probe attached to the

bottom of the logger that measures temperature or

temperature/RH. The MX2302A logger has one external sensor

that measures both temperature and RH and the MX2304

logger has one sensor that measures temperature only. The

MX2303 logger (shown at left above) has two external

temperature sensors; the left sensor is channel 1 and the right

sensor is channel 2.

Vent: The RH sensor is located behind the vent (MX2301A

model only).

Downloading the App and

Connecting to a Logger

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

1. Download HOBOconnect from the App Store® or Google

Play™.

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

prompted.

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

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

to it.

If the logger does not appear 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

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 there are several loggers in the area, move the logger

to a location with fewer loggers. Interference can

sometimes occur when numerous loggers are in one

location.

•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 app, but you cannot connect

to it, close the app and power cycle the mobile device.

This forces the previous Bluetooth connection to close.

Once the logger is connected, you can:

Tap this: To do this:

Select logger settings and save them onto the

logger to start logging. See Configuring the

Logger.

Read out (offload) logger data. See Reading Out

the Logger.

Start logging if the logger was configured to start

with a button push. See Configuring the Logger.

Stop the logger from recording data (this

overrides any Stop Logging settings described in

Configuring the Logger).

Illuminate the logger LEDs for 4 seconds.

Set a password for the logger that will be

required if another mobile device attempts to

connect to it. To reset a password, press the

button on the logger for 10 seconds or tap

and tap Reset.

Mark the logger as a favorite. You can then filter

the list of devices to only show loggers marked as

favorites.

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.

Alarm LED

Mounting

Holes

Start Button

External Sensor

Status LED

MX2303 model shown

Vent

MX2301A model shown

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Configuring the Logger

Use the app to set up the logger, including selecting the logging

options, configuring alarms, and other settings. These steps

provide an overview of setting up the logger. For complete

details, see the app user’s guide.

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

2. In the app, tap Devices and tap the logger in the app to

connect to it. If you are working with multiple loggers, you

can press the button on the logger a second time to bring it

to the top of the list.

3. Tap to configure the logger.

4. Tap Name and type a name for the logger (optional). If no

name is selected, the logger serial number is used as the

name.

5. Tap Group to add the logger to a group (optional). Tap Save.

6. Tap Logging Interval and choose how frequently the logger

will record data unless operating in burst logging mode (see

Burst Logging). Note: If you configure an alarm, the logger

will use the logging interval you selected as the rate to

check for alarm conditions (alarms are not available if burst

logging is configured). See Setting up Alarms for more

details.

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

•Now. Logging will begin immediately after configuration

settings are loaded on the logger.

•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 on a date and time you

specify. Select the date and time.

Tap Save.

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. This option is not available if

the Logging Mode is set to Burst (see Burst Logging).

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

logging by pushing the button on the logger for 3

seconds.

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

logging:

•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.

•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.

d. Tap Save.

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. Tap Save.

10. 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.

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

On is enabled, the logger will “advertise” or regularly send

out a Bluetooth signal for the phone or tablet to find via the

app while it is logging, which uses battery power. When

Bluetooth Always On is disabled, the logger will only

advertise during logging when you press the button on the

logger to wake it up, thereby preserving as much battery

power as possible.

12. Select the sensor measurement types that will be logged.

Both the temperature and RH sensors are required to

calculate dew point, which is an additional data series

available for plotting after reading out the logger. You can

also 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. Note for MX2303 models

only: The first temperature sensor listed is channel 1 and

the second is channel 2 (and “-1” and “-2” is used in the

column headings in the data file to differentiate the two

sensors).

13. Tap to save the configuration settings.

Logging will begin based on the settings you selected. Press the

start button on the logger if you set it up to start logging with a

button push. 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 Devices. Press the button on the logger to wake it up (if

necessary).

2. Tap the logger in the app to connect to it and tap .

3. Tap a sensor (tap the Enable Logging toggle in if necessary).

4. Select High if you want an alarm to trip when the sensor

reading rises above the high alarm value. Drag the slider or

type a value to set the high alarm value.

5. Select Low if you want an alarm to trip when the sensor

reading falls below the low alarm value. Drag the slider or

type a value to set the low alarm value.

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6. For the Duration, select how much time should elapse

before the alarm trips and select one of the following:

•Cumulative. The alarm will trip 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, then the

alarm will trip once the sensor readings have been above

85°F for a total of 30 minutes since the logger was

configured.

•Consecutive. The alarm will trip 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, then the

alarm will only trip if all sensor readings are 85°F or

above for a continuous 30-minute period.

7. Tap Save and repeat steps 3–7 for the other sensor if

desired.

8. In the configuration settings, 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 icon indication will display

until the sensor reading returns to the normal range

between any configured high and low alarm limits.

9. Tap .

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 8. Otherwise, the alarm state will

remain in place until the logger is reconfigured.

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.

•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 sensor reading is within

the resolution specifications.

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

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

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 Devices. Press the button on the logger to wake it up (if

necessary).

2. Tap the logger in the app to connect to it and tap .

3. Tap Logging Mode and then tap Burst Logging.

4. Select Low and/or High and either type or drag the slider to

set the low and/or high values.

5. Repeat step 4 for the other sensor if desired.

6. 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.

7. Tap Save.

8. Tap .

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.

•If high and/or low limits have been configured for more

than one sensor, then burst logging will begin when any

high or low condition goes out of range. Burst logging will

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 can begin or end when the sensor reading is

within the resolution specifications. This means the value

that triggers burst logging may differ slightly than the

value entered.

•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

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logged and the burst condition is cleared, even if the

actual high or low condition has not cleared.

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. The following statistics can be logged for each

sensor:

•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, a logger is configured with both the temperature

and RH sensors enabled, and the logging interval set to 5

minutes. The logging mode is set to fixed 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 and RH sensor

values every 5 minutes. In addition, the logger will take a

temperature and RH 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 5-minute period and log

the resulting values. When reading out the logger, this would

result 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 the button on the logger to wake it up (if

necessary).

2. Tap the logger in the app to connect to it and tap .

3. Tap Logging Mode and then select Fixed Logging.

4. Select Normal to record the current reading for each

enabled 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

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 Save.

8. Tap .

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 Devices. Press the button on the logger to wake it up (if

necessary). Tap the logger in the app to connect to it.

2. Tap and then .

3. Type a password and then tap Set.

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, press the

button on the logger for 10 seconds or connect to the logger

and tap , then , and tap Reset.

Reading Out the Logger

To offload data from the logger:

1. Tap Devices. Press the button on the logger to wake it up (if

necessary).

2. Tap the logger in the app to connect to it and tap . The

logger will read out the data to the phone or tablet.

3. Once the readout is complete, tap HOBO Files and select

the file to view it. Tap and then to export and share

the data.

Data can also be uploaded automatically to HOBOlink, Onset’s

web-based software, via the app or the MX gateway. For

details, see the app user’s 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 HOBO Files and select a file to open.

Tap and then tap . Select the events you want to plot

and tap OK.

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Internal Event Name Definition

Host Connected The logger was connected to the mobile

device.

Started The logger started logging.

Stopped The logger stopped logging.

Alarm

Tripped/Cleared

An alarm has occurred because the reading

was outside the alarm limits or back within

range. Note: Although the reading may have

returned to a normal range during logging,

an alarm cleared event will not be logged if

the logger was set up to maintain alarms

until reconfigured.

New Interval The logger has switched to logging at the

burst logging rate or back to the normal rate.

Safe Shutdown The battery level dropped below a safe

operating voltage and the logger performed

a safe shutdown.

Deploying and Mounting the Logger

Follow these guidelines when deploying the logger:

•A solar radiation shield is required if the MX2301A or

MX2305 logger or the external sensors from an

MX2302A, MX2303, or MX2304 logger will be in sunlight

at any time.

•When using a solar radiation shield with an MX2301A or

MX2305 model, the logger must be mounted using the

solar radiation shield bracket (MX2300-RS-BRACKET) to

the underside of the mounting plate as shown on the

next page.

For more details on the solar radiation shield, refer to the

Solar Radiation Shield Installation Guide at

www.onsetcomp.com/manuals/rs1.

•When deploying an MX2302A logger, it is recommended

that the sensor must be mounted vertically. If it must be

mounted horizontally, then make sure the vent on the

side of the sensor is vertical or facing down. If the sensor

is being deployed in an RS3-B solar radiation shield,

mount it vertically as shown below.

•When deploying a logger with external sensors

(MX2302A, MX2303, and MX2304), mount the logger so

the sensor cable is not being pulled. Leave about 5 cm (2

in.) of drip loop in the cable where it comes out of the

logger to prevent water from entering the logger

housing.

•For MX2301A and MX2305 loggers that are not being

deployed with a solar radiation shield or for loggers with

external sensors (MX2302A, MX2303, and MX2304), you

can either use the included large screws or cable ties to

mount the logger via the mounting holes. Use the screws

to attach the logger to a wall or flat surface. Use the

cable ties to affix the logger to a PVC pipe or mast. The

MX2301A logger must also be mounted vertically or with

the sensor vent facing down when not using the solar

radiation shield.

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 onsetcomp.com.

Battery Information

The logger requires one user-replaceable 2/3 AA 3.6 V lithium

battery (HRB-2/3AA). Battery life is 2 year, typical with a logging

interval of 1 minute, but may be extended to 5 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 connecting to the mobile device,

number of channels that are active, and use of burst mode or

statistics logging. Deployments in extremely cold or hot

temperatures or logging interval faster than 1 minute can

impact battery life. Estimates are not guaranteed due to

uncertainties in initial battery conditions and operating

environment.

Drip Loop

HOBO MX2300 Series Data Logger Manual

1-800-LOGGERS (564-4377) • 508-759-9500

www.onsetcomp.com/support/contact

trademarks or registered trademarks of Onset Computer Corporation. App Store and iPadOS are service marks or

registered trademarks of Apple Inc. Android and Google Play are trademarks of Google LLC. 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 20923-L

To install or replace the battery:

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

from the back of the logger.

2. Carefully separate the top and bottom of the logger

enclosure.

3. Remove the old battery and insert the new battery

observing polarity. It is recommended that you replace the

desiccant (DESICCANT2) when replacing the battery.

4. Make sure the rubber seal is clean and free of any debris

and then 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 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

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.

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