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OVERVIEW
Understanding a growing environment means understanding what’s happening above and below ground at the same time. The MX2311 measures both: total solar irradiance via an integrated LI-COR LI-200R pyranometer, and soil EC, VWC and soil temperature via an external LI-300/350 soil sensor, with internal temperature and RH rounding out the picture.
Volumetric water content tells you whether the root zone has enough water; soil EC tells you whether dissolved salts in that water are becoming a problem. Paired with solar and climate data, the logger supports calculated metrics including accumulated solar radiation, Daily Light Integral, VPD and dew point, so above and below-ground conditions can be assessed from one dataset instead of cross-referencing multiple instruments.
Configuration and data offload run through the HOBOconnect app over Bluetooth (up to 100 ft range), suited to microclimate studies, energy and renewables research, and agricultural or ecological monitoring across remote or hard-to-access sites.
Key features
- Research-grade solar radiation measurement via an integrated LI-COR LI-200R sensor
- Soil EC, volumetric water content and soil temperature via an external LI-300/350 soil sensor
- Internal temperature and RH, enabling on-device VPD and dew point calculation
- IP67-rated weatherproof housing, built for humid, wet or dusty environments
- User-replaceable battery, up to 2+ years typical life
- Configurable alarms flag out-of-range readings on the logger LED and in the app
- Configure and offload data via Bluetooth using the free HOBOconnect app
Important:
The HOBO MX2300 data loggers require the HOBOconnect App and a compatible mobile device. The system requirements for the HOBOconnect app can be found at the bottom of our HOBOconnect software page.
Not sure if the MX2311 is right for your project?
Solar radiation and soil monitoring needs vary a lot by site and study design. Call our team on 1300 768 887 and we’ll help you work out the right fit.
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SPECIFICATIONS
Temperature Sensor
Range -40 to 70°C (-40 to 158°F) Accuracy ±0.2 °C (typical) within -40 to 70 °C Resolution 0.008°C (.014 °F) Drift <0.01°C (0.018°F) per year Response Time* Without Solar Radiation Shield 17 minutes in air moving 1 m/sec Response Time* With Solar Radiation Shield 24 minutes in air moving 1 m/sec Relative Humidity (RH) Sensor
Range 0 to 100% RH, -40° to 70 °C 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 Response Time* Without Solar Radiation Shield 30 seconds in air moving 1 m/sec Response Time* With Solar Radiation Shield 40 seconds in air moving 1 m/sec Calculated Metrics Vapor Pressure Deficit (VPD) in kPa, and Dew Point (computed from logged data) Soil Moisture: Volumetric Water Content (VWC)
Measurement Range (select one at configuration)**** 0.00 to 1.0 m³/m³ VWC in mineral soils
0.00 to 1.0 m³/m³ VWC in soilless media
Apparent Dielectric Permittivity: 1 (air) to 80 (water)Accuracy ±0.03 m³/m³ typical
±0.06 m³/m³ maximum
Apparent Dielectric Permittivity: ±1 ƐaResolution 0.001 m³/m³
Apparent Dielectric Permittivity: 0.002 ƐaDielectric Measurement Frequency 70 MHz Volume of Influence 1400 ml Percent of Field Capacity (for VWC measurements only) Range: 0 to 200%
Resolution: 0.1%Soil Temperature*****
Measurement Range -40 to 70°C (-40 to 158°F) Accuracy ±0.5°C from -40° to -20°C
±0.3°C from -20°C to 70°CResolution 0.1°C (0.18°F) Soil Bulk Electrical Conductivity (EC)
Measurement Range 0 to 20000 µS cm-1 Accuracy ±5 % from 0 to 10000 µS cm-1
±8 % from 10000 to 20000 µS cm-1Resolution 1 µS cm-1 Global Solar Radiation (GSR) 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% Stability <= 2% change over one year Temperature -40 to 65°C (-40 to 149°F) 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 (0.95” x 1.43”) Cable Length 1.8 m Calculated Metrics Accumulated solar radiation in MJ/m², daily light integral (DLI) of solar Logger
Operating Range -40 to 70°C (-40 to 158°F) Radio Power 1mW (0 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; 4 years, typical with logging interval of 1 minute and Bluetooth Always On disabled. Faster logging intervals and statistics sampling intervals, burst logging, remaining connected with the app, excessive downloads, and paging may impact battery life. 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.)
Soil moisture sensor (only): 4.6 × 4.6 × 10.9 cm (1.81 × 1.81 × 4.31 in)
Soil moisture sensor needle length: 5.4 cm (2.14 in)
Soil moisture sensor needle diameter: 0.40 cm (0.16 in)
Sensor cable length: 2 m (6.56 ft)Weight (unpackaged) 333 g (11.8 oz) Weight (packaged) 490 g (17.3 oz) Materials Acetal, silicone gasket, stainless steel screws
Soil Moisture Sensor: ASA plastic body with polyurethane epoxy filling and stainless-steel pins
Cable: PVC, UV resistant and rodent repellent (soil moisture sensor cable)Environmental Rating Logger: NEMA 6 and IP67
Soil Moisture sensor and cable: xxxx* Typical, up to 90% of change
** Per RH sensor manufacturer data sheet
*** Calibrated against an Eppley Precision Spectral Pyranometer (PSP) under natural daylight conditions. Absolute uncertainty under these conditions is ± 3% typical; ± 5% maximum.
**** The sensor data can be post-calibrated if necessary (e.g. the sensor is used in non-mineral soil types or higher than standard accuracy is required). Users can apply a calibration equation to the data exported from HOBOlink. The VWC range will depend on the calibration equation.
***** For additional accuracy, the sensor data can be post-calibrated for a particular soil by applying a calibration equation to the data exported from the app.
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HOBO CONNECT
Download the free HOBOconnect app for your iOS or Android mobile device or Windows computer today.
The 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 MX2311 – Temp/RH, Solar & Soil Moisture Data Logger
$2,435.00 ex GST AUD
An all-in-one, research-grade logger measuring global solar radiation, temperature, RH, soil electrical conductivity and volumetric water content, delivering a complete microclimate and root-zone picture from a single Bluetooth-enabled device.
Need Remote Access?
Add the MX Gateway for remote access to your data in the LI-COR cloud IoT Platform (formerly HOBOlink).
