HOBO MX2300 Series Data Logger User Manual

HOBO   **MX2300 Series Data Logger User Manual

**

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.

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 MRSA 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)

Logger Components and Operation

• MX2303 model shown

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.

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.
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 above85°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 fall 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 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.

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.

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.

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.

Translation:
The service related to human safety is not allowed because this device may have the possibility of the radio interference.

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| NA

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| NA

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| NA

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

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

1-508-759-9500 (U.S. and International)
1-800-LOGGERS (564-4377) (U.S. only)
www.onsetcomp.com/support/contact

© 2016–2020 Onset Computer Corporation. All rights reserved. Onset, HOBO, HOBOconnect, and HOBOlink are 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

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