Hobo MX Series Manual

HOBO® MX Soil Moisture (MX2306) and
MX Soil Moisture and Temperature (MX2307) Data Logger Manual
MX2307 Model Shown
HOBO MX2306 and
MX2307 Data Loggers
Models:
• Soil Moisture (MX2306)
• Soil Moisture and
Temperature (MX2307)
Included Items:
• Screws
• Cable ties
Required Items:
• HOBOconnect app
• Mobile device with
Bluetooth and iOS,
iPadOS®, or Android™, or a
Windows computer with a
native BLE adapter or
supported BLE dongle
Accessories (sold
separately):
• Solar radiation shield
(RS3-B for use with
MX2307)
• Soil moisture verification
clip (TEROS-CLIP)
• Replacement battery
(HRB-2/3AA)
26456-C
The HOBO MX Soil Moisture (MX2306) and HOBO MX Soil Moisture and Temperature (MX2307)
data loggers measure soil moisture and temperature in numerous soil types, including high
salinity and sandy soil. These Bluetooth®-enabled loggers are designed for wireless
communication with a phone, tablet, or computer. Using the HOBOconnect® app, you can
easily configure the logger and then download logged data to view or export for further
analysis. The logger can calculate minimum, maximum, average, and standard deviation
statistics and be configured to indicate alarms at user-specified thresholds. The loggers also
support burst logging, in which data is logged at a faster interval when sensor readings are
above or below certain limits.
Specifications
Measurement Range
(select one at
configuration)
Accuracy *
Resolution
Dielectric Measurement
Frequency
Volume of Influence
Percent of Field Capacity
(for VWC measurements
only)
Temperature Sensor
(MX2307)
Range
Accuracy
Resolution
Drift
Response Time
Logger
Operating Range
Radio Power
Transmission Range
Wireless Data Standard
Logging Rate
Logging Modes
Memory Modes
Start Modes
Stop Modes
0.00 to 0.64 m³/m³ VWC in mineral soils
0.00 to 0.70 m³/m³ VWC in soilless media
Apparent Dielectric Permittivity: 1 (air) to 80 (water)
±0.031 m³/m³ typical in mineral soils that have solution EC <8
dS/m
±0.051 m³/m³ typical in soilless media
Apparent Dielectric Permittivity: +/- 1 Ɛa for the range 1 to 40
(soil range); +/-15% for over 40
0.001 m³/m³
Apparent Dielectric Permittivity: 0.1 Ɛa
70 MHz
430 ml
Range: 0 to 200%
Resolution: 0.1%
-40 to 100°C (-40 to 212°F), with tip and cable immersion in fresh
water up to 50°C (122°F) for one year
±0.25°C from -40 to 0°C (±0.45 from -40 to 32°F)
±0.2°C from 0 to 70°C (±0.36 from 32 to 158°F)
±0.25°C from 70 to 100°C (±0.45 from 158 to 212°F)
0.04°C (0.072°F)
<0.01°C (0.018°F) per year
3 minutes in air moving 1 m/s; 20 seconds in stirred water
4 minutes in air moving 1 m/s with RS3-B Solar Radiation Shield
-25° to 60°C (-13° to 140°F)
1 mW (0 dBm)
Approximately 30.5 m (100 ft) line-of-sight
Bluetooth Low Energy (Bluetooth Smart)
1 second to 18 hours
Fixed Interval Logging or Burst Logging
Never Stop (Overwrites Old Data) or Stop When Full
On Save (immediate), On Next Interval, On Push Button, On
Date/Time
Never Stop (Overwrites Old Data), On Date/Time, After (a
specified amout of time), Stop When Memory Fills