HOBO MX2307A Wireless Soil Moisture, EC/WC/Temperture Data Logger - Optional Remote Monitoring
The MX2307A combines air temperature, relative humidity, soil moisture (VWC), soil temperature, and soil electrical conductivity (EC) in a single logger for irrigation management, agriculture, turf, and environmental research.
Communications
Access your data directly from your mobile phone, tablet or Windows computer when within 100 foot (30 m) line-of-sight range of the logger, with the free HOBOconnect app.
To enable cloud data storage and analysis, add an MX Data Plan (select from the options above).
To enable near real-time remote monitoring and alerts via email or text message, add an MX Data Plan and an MX Gateway (select from the options above). Note: the MX Gateway must be indoors.
You can download the HOBOconnect app here:
| Power (Outdoor Unit) | Battery only |
|---|---|
| Batteries (Outdoor Unit) | 2/3 AA 3.6 Volt lithium (included). User-replaceable. |
| HOBO Product Series | MX2300 |
| Measurements | Dew Point, Evapotranspiration, Humidity, Soil Electrical Conductivity (EC), Soil Moisture, Soil Temperature, Temperature |
| Data Available By | Online, Mobile App, WiFi, Email, Ethernet, Wireless (Bluetooth/RF) |
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 Ɛa
Resolution
-
0.001 m³/m³
Apparent Dielectric Permittivity: 0.002 Ɛa
Dielectric 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°C
Resolution
-
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-1
Resolution
-
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 g11.8 oz
Weight (Packaged)
-
490 g17.3 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.
HOBO MX2307A Data Logger with 2m cable(s) and attached sensor(s)
HOBO MX Soil Moisture Logger Quick Start
Screws
Cable ties
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Ideal for researchers and growers looking for the accurate data to complete their plant growth picture, this Bluetooth-enabled, fully integrated logger delivers high precision measurements for soil moisture/electrical conductivity (EC), volumetric water content (VWC), and temperature with an external sensor, as well as temperature/relative humidity with an internal sensor.
For use in both mineral soils and soilless media.
Option to view data in Percent of Field Capacity.
Assess growing conditions, improve crop yields, reduce harmful runoff, and protect ecosystems.
Key Features
Wireless Bluetooth Data Offload -Fast, easy logger setup and download via phone or tablet (up to ~100 ft range). For indoor areas, such as greenhouses, add the optional MX Gateway and MX Data Plan for remote access to your data.
Durable TEROS 10 soil moisture sensor - lasts over 10 years in the field. With sturdy, sharp stainless-steel spikes for easy installation and better soil contact
Integrated Temperature & Humidity Monitoring - Logged temperature and humidity alongside solar radiation for a complete view of environmental conditions
Rugged, Weatherproof Design -Durable IP67/NEMA 6 housing stands up to humid, wet, and dusty environments found in greenhouses, growth chambers, or outdoor field sites.
Long Battery Life & Memory -User-replaceable battery lasts up to ~2+ years and ample data storage supports extended deployments.
Alarms and Alerts - See out-of-range conditions with logger's LED readout, and configure threshold alerts using HOBOconnect for proactive monitoring.
Easy Deployment -Users can deploy the logger in minutes, configure logging intervals via the HOBOconnect app, and wirelessly retrieve data (without a laptop) in the field!
Requires a compatible mobile device or Windows computer and the HOBOconnect app.