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  • MX2302A
  • MX2302A
  • MX2302A
  • MX2302A
  • MX2302A
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HOBO External Temperature/RH Sensor Data Logger

Part # MX2302A
 
Bluetooth Low Energy (BLE)
 

The HOBO MX2300 data logger requires a compatible mobile device and the HOBOconnect app. System requirements for the app can be found at the bottom of the HOBOconnect software page. The MX2302 is designed for use with the RS3-B Solar Radiation Shield and is not compatible with the RS3 version. 

Learn More

Overview

The HOBO MX2302 is a weatherproof data logger with external temperature and relative humidity sensors. Leveraging Bluetooth Low Energy, the logger enables easy, fast setup and data download directly from your mobile device with Onset's free HOBOconnect app. The MX2302 provides high-accuracy measurements in harsh outdoor environments.

Add the MX Gateway for remote access to your data in Onset's cloud-based HOBOlink software. 

You can download the HOBOconnect app here: 

  

  • Convenient wireless setup and download via Bluetooth Low Energy (100-foot range)
  • Retrieve data in hard-to-reach locations
  • Visual alarms alert you to out-of-range conditions
  • Compact, weatherproof housing with built-in mounting
  • View current data in real time with Onset’s free HOBOconnect app
  • Share downloaded data easily from your mobile device
  • Accuracy: +/- 0.2C° and +/- 2.5% RH

In what environment does this operate?

This operates in indoor and outdoor environments.

What measurements does this support?

The supports the following measurements: Dew Point, Relative Humidity and Temperature

The country of origin for this product is the United States. To see the full specifications for this product, please see our product manual found under the documentation tab if available.

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
CE Compliant The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).
FCC Logo Australia/New Zealand General Compliance mark  Japanese Telecom and Radio Certificaiton Mark South Korea KC Certification for Electrical and Electronic Products  

*Per RH sensor manufacturer data sheet

    • HOBO MX2302 Ext Temp/RH Data Logger
    • Screws
    • Cable ties

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NIST-RH

Onset offers testing and certification of HOBO data logger and sensor RH (relative humidity) accuracy using standards traceable to the U.S. National Institute of Standards & Technology (NIST). This includes single-point (50% RH @ 25C) or three-point (25, 50, 75% RH @ 25C) NIST certification. For each data logger certified, a certificate is provided showing the device’s RH and temperature accuracy vs. a NIST traceable standard. Certification is available for all currently manufactured Onset data loggers and sensors. 

NOTE: The temperature value used for RH certification is fixed at 25C and verified against a NIST-traceable 200-ohm platinum RTD (resistance temperature detector). If additional temperature certification is required at temperature values other than 25C, Onset’s temperature NIST certification services must also be performed. Onset’s temperature NIST services offer certification in an oil-bath for user-selectable temperature points between -30 and 120C. If custom temperature points are desired additional cost and lead time will apply.

Onset also offers NIST temperature certification, learn more.

Frequently Asked Questions

Q: Can I request RH NIST Certification for an existing logger that I already own?
A: Yes, please fill out our technical support form for further instructions. 

Q: Can I request RH NIST Certification for loggers no longer in production (like the H08 loggers)?
A: Only Onset data loggers and sensors that are currently in production are available for RH NIST Certification

Q: Does Onset RH NIST-certify data loggers made by other manufacturers?
A: No, only currently-manufactured Onset data loggers and sensors are supported.

Q: Will I get as-found data as part of this service?
A: Onset data logger products and sensors are not adjustable to correct for drift over time. If your logger or sensor is found to be within acceptable RH limits the RH test data will be included on your certification report. If your logger or sensor is found to be out of tolerance you will be contacted by Onset Technical Support with a copy of your as-found data and offer options for repair or replacement.

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NIST-TEMP-POINT

Temperature point certification charge on a per-data logger basis. (Download Sample Certificate - PDF)

This service provides testing and certification of Onset temperature data loggers' accuracy using standards traceable to the U.S. National Institute of Standards & Technology (NIST). For each data logger certified, a certificate is provided showing the data logger's temperature accuracy versus a NIST traceable standard. Certification is available for all standard Onset temperature data loggers, including both new data logger purchases and data loggers already owned. Temperature points used for certification are user-selected and can be specified in 1°C increments from -30°C to +120°C. The actual points used for certification will be ±0.25°C. Certification is also available for multi-channel data loggers, however only for the temperature channels.

 
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RS3-B

Use the RS3-B Solar Radiation Shield with HOBO external sensors for improved temperature measurement accuracy in locations exposed to sunlight. The small size and unobstructed airflow of this shield provides a faster response to changing conditions than larger radiation shields.

The RS3-B Solar Radiation Shield works with most of Onset’s external temperature and temperature/relative humidity sensors, including those for our award-winning HOBO Weather Station products.

For customers looking for a radiation shield large enough to mount a HOBO data logger inside it, Onset also offers two other models of solar radiation shields; the RS1 and the pre-assembled M-RSA

 

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