HOBO MX2309 Temp/RH/Solar Data Logger HOBO MX2309
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HOBO® MX2309 Temp/RH/Solar Data Logger




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HOBO MX2309 Temp/RH/Solar Data Logger

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. The sensor can be mounted in the field. 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.

Brand: HOBO
MPN: MX2309
UPC:
UNSPSC: 41111900
Weight:

Temperature Sensor – Range: -40 to 149 °F (-40 to 65 °C). Accuracy: ±0.2 °C (typical) within -40 to 65 °C. Resolution: .014 °F (0.008°C). Drift: <0.018°F (0.01°C) per year. Relative Humidity (RH) Sensor – Range: 0 to 100% RH, -40° to 149 °F (-40° to 65 °C); exposure to conditions below -4°F(-20°C) 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 77°F (25°C); 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: (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/sec. Relative 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/sec. Logger – Operating Range: -40 to 149 °F (-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 32° to 122°F(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. Faster logging intervals and statistics sampling intervals, burst logging, remaining. 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, 4.25˝ x 2.0˝ x 0.88˝; LI-190R, 0.93˝ × 1.43˝. Weight: 5.26 oz. Environmental Rating: NEMA 6 and IP67.
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