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MX2311 HOBO Temp/RH + Solar + Soil EC/VWC/Temp Data Logger
Research-grade multiparameter logger for temperature, relative humidity, solar radiation, and soil moisture and electrical conductivity, with Bluetooth data offload.
The MX2311 combines research-grade LI-COR sensors for solar radiation and soil moisture with integrated temperature and relative humidity sensors. It measures global solar radiation, temperature, RH, volumetric water content (VWC), and soil electrical conductivity (EC), and calculates accumulated radiation, solar DLI, VPD, dew point, EC, and VWC for root-zone and microclimate analysis.
Wireless configuration and data retrieval use Bluetooth and the HOBOconnect app, up to approximately 30.5 m line of sight. The IP67/NEMA 6 housing withstands humid, wet, and dusty environments; the user-replaceable battery lasts up to 2 years or more depending on configuration. The LI-200R measures 400–1100 nm with ±3% typical calibration uncertainty. M-PLT and 2003S are required for mounting; M-BRK and 2003S are required for poles or pipes.
Features and specifications
- Bluetooth Low Energy up to approximately 30.5 m; HOBOconnect app.
- Temperature: −40 to 70 °C range; ±0.2 °C typical accuracy; 0.008 °C resolution.
- Relative humidity: 0–100 % RH; ±2.5 % typical accuracy from 10–90 %; 0.01 % RH resolution.
- VWC: 0.00–1.0 m³/m³; ±0.03 typical and ±0.06 maximum accuracy; 0.001 resolution; 70 MHz frequency.
- Soil temperature: −40 to 70 °C; ±0.5 °C from −40 to −20 °C and ±0.3 °C from −20 to 70 °C; 0.1 °C resolution.
- Soil apparent EC: 0–20,000 µS cm⁻¹; ±5 % up to 10,000 and ±8 % from 10,000 to 20,000 µS cm⁻¹; 1 µS cm⁻¹ resolution.
- Global solar radiation: 0–1280 W/m²; ±3 % typical, ±5 % maximum accuracy; 0.05 W/m² resolution.
- LI-200R solar sensor: 400–1100 nm spectral range; maximum 1 % linearity deviation; cosine correction up to 82°.
- Calculated metrics: VPD, dew point, accumulated radiation, solar DLI, EC, and VWC.
- IP67/NEMA 6 housing; logger operating range −40 to 70 °C.
- Logging rate from 1 second to 18 hours; maximum memory 195,000 measurements.
- Power: user-replaceable 2/3 AA 3.6 V lithium battery; typical life 2 years with Bluetooth always on and up to 4 years with it off.
- Logger dimensions: 10.8 × 5.08 × 2.24 cm; soil moisture sensor cable: 2 m.
- Mounting: M-PLT and 2003S leveling fixture; M-BRK and 2003S for poles or pipes.
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