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Part Number -
MX2309
HOBO MX2309 Temp/RH/Solar Data Logger
Measures Temperature, RH & Solar Radiation with LI-COR 200R Pyranometer
$545.00 USD
Research-grade, multiparameter microclimate monitoring solution with effortless Bluetooth data offload that continuously measures global solar radiation, temperature, and humidity. Ideal for agricultural, environmental research, ecology, and energy applications.
Important Information
Requires a compatible mobile device or Windows computer and the HOBOconnect app. System requirements for the app can be found at bottom of the HOBOconnect software page.
Get cloud storage and access to the powerful tools of LI-COR Cloud® IoT software! (formerly HOBOlink)
Add an MX Data Plan!
Compatible with
Overview
The MX2309 pairs research-grade sensing with wireless convenience, integrating the renowned LI-COR LI-200R pyranometer that delivers solar radiation measurements with scientific-grade accuracy (calibration uncertainty of ±3% typical).
This all-in-one device captures a comprehensive climate picture, combining an external LI-200R pyranometer (measuring total solar irradiance in the 400–1100 nm range) and built-in temperature and relative humidity sensors. This enables the calculation of critical metrics such as Accumulated Solar Radiation (MJ/ m²), Daily Light Integral (DLI of Solar, MJ/m²/day), Vapor Pressure Deficit (VPD, kPa), and Dew Point. Providing laboratory-quality measurements of solar climate conditions in an affordable, mobile logger, the rugged, battery-powered MX2309 is easily deployed and expands monitoring capabilities to an even broader range of environmental and energy applications.
IMPORTANT NOTE: For mounting, an M-PLT and 2003S Leveling Fixture are required. Mounting to poles or pipes require an M-BRK and 2003S.
Users can mount the sensor in the field, and setup and data retrieval are seamlessly simple—no cables or additional download devices needed using the free HOBOconnect app on your phone or tablet. Effortlessly configure the logger and download data via Bluetooth (up to a 100 ft range), which allows you to deploy in and download data from hard-to-reach spots.
Expand your remote monitoring by adding an MX Data Plan, which allows you to upload data to LI-COR Cloud remote software for further analysis, sharing, and more.
Features
Wireless Bluetooth Data Offload
Fast, easy logger setup and download via phone or tablet (up to ~100 ft range)
Research-grade Solar Radiation Measurements
Integrated LI-COR 200R sensor measures total solar irradiance in the 400–1100 nm range with ±3% typical calibration uncertainty
Integrated Temp & RH Monitoring
Logged temperature and humidity alongside solar radiation for a complete view of environmental conditions
Rugged, Weatherproof Design
Durable IP67/NEMA 6 housing stands up to humid, wet, and dusty environments found in greenhouses, growth chambers, or outdoor field sites
Long Battery Life & Memory
User-replaceable battery lasts up to ~2+ years and ample data storage supports extended deployments
Alarms and Alerts
See out-of-range conditions with logger's LED readout, and configure threshold alerts using HOBOconnect for proactive monitoring
Easy Deployment
Users can deploy the logger in minutes, configure logging intervals via the HOBOconnect app, and wirelessly retrieve data (without a laptop) in the field!
Specifications
Temperature Sensor
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-40 to 65 °C (-40 to 149 °F)
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±0.2 °C (typical) within -40 to 65 °C
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0.008°C (.014 °F)
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<0.01°C (0.018°F) per year
Range
Accuracy
Resolution
Drift
Relative Humidity (RH) Sensor
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0 to 100% RH, -40° to 65 °C (-40° to 149 °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%
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±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
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0.01% RH
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<1% per year typical
Range
Accuracy
Resolution
Drift
Global Solar Radiation Sensor
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0 to ~1280 W/m² (full sunlight)
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±3% typical, ± 5% maximum (LI-200R Absolute Calibration:)*
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± 0.5 W/m²
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0.05 W/m²
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400–1100 nm
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Maximum deviation of 1% up to 3,000 W m-2
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<= 2% change over one year
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±0.15% per ˚C maximum
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Cosine corrected up to 82˚ angle of incidence
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<±1% error over 360˚ at 45˚ elevation
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No error induced from orientation
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High stability silicon photovoltaic detector (blue enhanced)
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Weatherproof anodized aluminum case with acrylic diffuser and stainless steel hardware. O-ring seal on the sensor base.
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2.36 cm diameter x 3.63 cm (095” x 1.43”)
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1.8 m
Range
Accuracy
Offset
Resolution
Spectral Range
Linearity
Stability
Temperature Dependence
Cosine Correction
Azimuth
Tilt
Detector
Sensor Housing
Sensor Size
Cable Length
Calculated Metrics
Accumulated Solar Radiation in MJ/m², Daily Light Integral (DLI) of Solar in MJ/m²/day, Vapor Pressure Deficit (VPD) in kPa, and Dew Point
Response Time (typical, to 90% of charge)
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Without Solar Radiation Shield: 17 minutes in air moving 1 m/secWith RS1 Solar Radiation Shield: 24 minutes in air moving 1 m/sec
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Without Solar Radiation Shield: 30 seconds in air moving 1 m/secWith RS1 Solar Radiation Shield: 40 seconds in air moving 1 m/sec
Temperature
Relative Humidity (RH)
Logger
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-40 to 65 °C (-40 to 149 °F)
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0.4mW (-4 dBm)
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Approximately 30.5 m (100 ft) line-of-sight
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Bluetooth Low Energy (Bluetooth Smart)
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1 second to 18 hours
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Fixed interval (normal, statistics) or burst
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Wrap when full or stop when full
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Immediate, push button, date & time, or next interval
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When memory is full, push button, date & time, or after a set logging period
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±1 minute per month 0° to 50°C (32° to 122°F)
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2/3 AA 3.6 Volt lithium, user replaceable
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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 c
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195,000 measurements, maximum
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Approximately 4-5 minutes; may take longer the further the device is from the logger
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Logger housing: 10.8 x 5.08 x 2.24 cm (4.25 x 2.0 x 0.88 in.)LI-190R: 2.36 cm diameter × 3.63 cm (0.93 × 1.43 in.)
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Logger: 149 g (5.26 oz)
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Acetal, silicone gasket, stainless steel screws
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NEMA 6 and IP67
Operating Range
Radio Power
Transmission Range
Wireless Data Standard
Logging Rate
Logging Modes
Memory Modes
Start Modes
Stop Modes
Time Accuracy
Battery Type
Battery Life
Memory
Full Memory Download Time
Dimensions
Weight
Materials
Environmental Rating
*: Calibrated against an Eppley Precision Spectral Pyranometer (PSP) under natural daylight conditions. Absolute uncertainty under these conditions is ± 3% typical; ± 5% maximum
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