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.
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.
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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, Long Battery Life & Memory
Durable IP67/NEMA 6 housing stands up to humid, wet, and dusty environments found in greenhouses, growth chambers, or outdoor field sites |
Specifications
Temperature Sensor |
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Range Accuracy |
-40° to 65°C ±0.2°C within -40° to 65°C |
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Resolution Drift |
0.008°C <0.01°C per year |
Relative Humidity (RH) Sensor |
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| Range | 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% |
| Accuracy | ±2.5% from 10% to 90% (typical) to a maximum of ±3.5% including hysteresis at 25°C; below 10% and above 90% ±5% typical |
| Resolution | 0.01% |
| Drift | <1% per year typical |
Global Solar Radiation Sensor |
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Range |
0 to ~1280 W/m² (full sunlight) |
| Accuracy | ±3% typical, ± 5% maximum (LI-200R Absolute Calibration:)* |
| Offset | ± 0.5 W/m² |
| Resolution | 0.05 W/m² |
| Spectral Range | 400–1100 nm |
| Linearity | Maximum deviation of 1% up to 3,000 W m-2 |
| Stability | <= 2% change over one year |
| Temperature Dependence | ±0.15% per ˚C maximum |
| Cosine Correction | Cosine corrected up to 82˚ angle of incidence |
| Azimuth | <±1% error over 360˚ at 45˚ elevation |
| Tilt | No error induced from orientation |
| Detector | High stability silicon photovoltaic detector (blue enhanced) |
| Sensor Housing | Weatherproof anodized aluminum case with acrylic diffuser and stainless steel hardware. O-ring seal on the sensor base. |
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Sensor Size |
2.36 cm diameter x 3.63 cm (095” x 1.43”) |
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Full Memory Download Time |
Approximately 60 seconds depending on the mobile device; may take longer the further the device is from the logger |
| Cable Length | 1.8 m |
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
Logger |
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| Operating Range | -40 to 65 °C |
| Radio Power | 0.4mW (-4 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 is full, push button, date & time, or after a set logging period |
| Time Accuracy | ±1 minute per month 0° to 50°C |
| 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. |
| Memory | 195,000 measurements, maximum |
| Dimensions | 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.) |
| Weight | Logger: 149 g (5.26 oz) |
| Materials | Acetal, silicone gasket, stainless steel screws |
| Environmental Rating | NEMA 6 and IP67 |