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OVERVIEW
The HOBO MX2309 Temp/RH/Solar Data Logger delivers advanced, research-quality environmental monitoring in a versatile and robust platform. Engineered to measure temperature, relative humidity, and global solar radiation—with integrated LI-COR LI-200R pyranometer—it is ideally suited for demanding applications in agriculture, environmental research, ecology, and energy sectors. Precise and reliable, the MX2309 ensures that professionals have access to high-quality data for critical decision-making.
Powered by LI-COR’s LI-200R pyranometer for high-accuracy solar data
Key Features and Benefits
Comprehensive Environmental Sensing
The HOBO MX2309 incorporates high-accuracy sensors to deliver simultaneous measurements of temperature, relative humidity, and solar radiation. The LI-COR LI-200R pyranometer provides solar radiation data with a typical calibration uncertainty of ±3%, supporting accurate determination of metrics such as Accumulated Solar Radiation (MJ/m²), Daily Light Integral (DLI, MJ/m²/day), Vapor Pressure Deficit (VPD, kPa), and Dew Point.Streamlined Bluetooth Data Management
Featuring integrated Bluetooth connectivity, the MX2309 enables seamless configuration and data download using the free HOBOconnect app on a mobile device. Wireless data offload is possible from distances up to 100 feet (30 meters), eliminating the need for direct cable connections and simplifying data access from remote or difficult-to-reach installations.Durable, Field-Ready Construction
Designed for rigorous field use, the HOBO MX2309 is rugged and battery-powered, ensuring consistent performance across diverse environmental conditions. Its robust enclosure guards internal components against harsh elements, making it suitable for long-term monitoring in agriculture, forestry, energy, and other challenging settings.Ease of Deployment and Operation
The logger’s compact design enables quick and flexible installation, whether in fixed or portable setups. With HOBOconnect, users can intuitively configure settings and manage data, reducing setup time and enhancing operational efficiency.Applications
The HOBO MX2309 serves as a comprehensive solution for research and professional monitoring requirements, including microclimate assessment, crop management, ecological studies, and energy resource evaluation. Its research-grade precision and user-friendly features help optimise workflows and improve data-driven outcomes.
Improve your environmental monitoring capabilities with the HOBO MX2309 Temp/RH/Solar Data Logger—trusted by professionals for reliable, high-precision performance.
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SPECIFICATIONS
Temperature Sensor
Range -40 to 65 °C (-40 to 149 °F) Accuracy ±0.2 °C (typical) within -40 to 65 °C Resolution 0.008°C (.014 °F) Drift <0.01°C (0.018°F) per year Relative Humidity (RH) Sensors
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 (77°F); below 10% RH and above 90% RH ±5% typical Resolution 0.01% RH Drift <1% per year typical Global Solar Radiation Sensor
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. Sensor Size 2.36 cm diameter x 3.63 cm (095” x 1.43”) Cable Length 1.8 m 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)
Temperature Without Solar Radiation Shield: 17 minutes in air moving 1 m/sec
With RS1 Solar Radiation Shield: 24 minutes in air moving 1 m/secRelative Humidity (RH) Without Solar Radiation Shield: 30 seconds in air moving 1 m/sec
With RS1 Solar Radiation Shield: 40 seconds in air moving 1 m/secLogger
Operating Range -40 to 65 °C (-40 to 149 °F) 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 (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 c Memory 195,000 measurements, maximum Full Memory Download Time Approximately 4-5 minutes; 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.)
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 *: 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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HOBOCONNECT
Download the free HOBOconnect app for your iOS or Android mobile device or Windows computer today.
Onset’s HOBOconnect app, accessed from a free download from the iTunes or Google Play app store, or your pc, makes it quick and easy to configure compatible MX Series data loggers (chart below) and manage the collected data. From your mobile device, tablet, or Windows computer, users can view data in graphs, check the operational status of loggers, share data files and graph images for analysis in Excel, Numbers, and other applications, and store data in the cloud. HOBOconnect also makes it fast and easy to set up audible alarm notifications so users are immediately notified of problems.
Learn more about HOBOconnect >>
HOBO MX2309 Temp/RH/Solar Data Logger
$1,557.00 ex GST
The HOBO MX2309 is a research-grade data logger that measures temperature, humidity, and solar radiation using the LI-COR 200R Pyranometer. With Bluetooth data offload, it’s perfect for microclimate monitoring in agriculture, environmental research, and energy applications.
Need Remote Access?
Add the MX Gateway for remote access to your data in the LI-COR cloud IoT Platform (formerly HOBOlink).
