Specifications

ManualsBrandsOnset Computer ManualsData LoggersMX2306 HOBO MX Soil Moisture Data Logger, MX2307 HOBO MX Soil Moisture and Temperature Data Logger

HOBO®MXSoilMoisture(MX2306)and

MXSoilMoistureandTemperature(MX2307)DataLoggerManual

26456‐A

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,theusercan

easilyconfiguretheloggerandthendownloadloggeddatatovieworexportforfurther

analysis.Theloggers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)

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)

Accuracy* ±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

Resolution 0.001m³/m³

ApparentDielectricPermittivity:0.1Ɛa

DielectricMeasurement

Frequency

70MHz

VolumeofInfluence 430ml

Percentof

FieldCapacity

(forVWCmeasurements

only)

Range:0to200%

Resolution:0.1%



TemperatureSensor

(MX2307)



Range ‐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

Accuracy ±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)

Resolution 0.04°C(0.072°F)

Drift <0.01°C(0.018°F)peryear

ResponseTime 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

Logger



OperatingRange ‐25°to60°C(‐13°to140°F)

RadioPower 1mW(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full,pushbutton,date&time,orafteraset

loggingperiod

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)



MX2307ModelShown

Summary of content (9 pages)

PAGE 1
HOBO® MX Soil Moisture (MX2306) and MX Soil Moisture and Temperature (MX2307) Data Logger Manual 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.
PAGE 2
HOBO MX Soil Moisture (MX2306) and MX Soil Moisture and Temperature (MX2307) Data Logger Manual 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; 5 years, typical with logging interval of 1 minute and Bluetooth Always On disabled.
PAGE 3
HOBO MX Soil Moisture (MX2306) and MX Soil Moisture and Temperature (MX2307) Data Logger Manual External Sensor: This is the soil moisture (and temperature sensor in MX2307 model) attached to the bottom of the logger. Soil Moisture Sensor Components and Operation The soil moisture sensor measures the volumetric water content (VWC) of soil using stainless‐steel needles. A ferrite core positioned on the sensor cable 7.
PAGE 4
HOBO MX Soil Moisture (MX2306) and MX Soil Moisture and Temperature (MX2307) Data Logger Manual Tap this: > Start logging if the logger was configured to start with a button push. See Configuring the Logger. > Stop the logger from recording data (this overrides any Stop Logging settings described in Configuring the Logger). > >  Now. Logging will begin immediately after configuration settings are loaded on the logger.
PAGE 5
HOBO MX Soil Moisture (MX2306) and MX Soil Moisture and Temperature (MX2307) Data Logger Manual logger is pressed to wake it up, thereby preserving as much battery power as possible. to 0.05 m³/m³ for a soil moisture alarm and the duration is set to 30 minutes, the alarm will trip once the sensor readings have been below 0.05 m³/m for a total of 30 minutes since the logger was started. 12. Select Soil Type:  Mineral – for common soils, with EC values up to 8 dS/m.
PAGE 6
HOBO MX Soil Moisture (MX2306) and MX Soil Moisture and Temperature (MX2307) Data Logger Manual selected. Statistics are calculated at a sampling rate you specify with the results for the sampling period recorded at each logging interval. The following statistics can be logged for each sensor: To set up burst logging: 1. Tap Devices. Press the button on the logger to wake it up (if necessary). 2. Tap the logger in the app to connect to it and tap  The maximum, or highest, sampled value . 3.
PAGE 7
HOBO MX Soil Moisture (MX2306) and MX Soil Moisture and Temperature (MX2307) Data Logger Manual Setting a Password Internal Event Name Definition You can create an encrypted password for the logger that will be required if another device attempts to connect to it. This is recommended to ensure that a deployed logger is not mistakenly stopped or purposely altered by others. This password uses a proprietary encryption algorithm that changes with every connection. Stopped The logger stopped logging.
PAGE 8
HOBO MX Soil Moisture (MX2306) and MX Soil Moisture and Temperature (MX2307) Data Logger Manual  Avoid any metal located between the sensor and the ferrite core because it can interfere with VWC measurements. Trench Installation Method This method is best for shallow installations at less than 40 cm (15.7 inches). This requires digging a trench with a shovel, excavator, or other tool to the depth of the deepest installed sensor (if installing more than one in the measurement location).
PAGE 9
installation. Higher density can cause the sensor readings to be elevated. Maintenance To clean the soil moisture sensor and needles, use a mild detergent, such as liquid dish soap, and a nonabrasive sponge or cloth. Avoid detergents that contain lotions or moisturizers. Rinse the sensor and needles thoroughly with tap or deionized (DI) water. The logger is designed for outdoor use, but should be inspected periodically. Wipe off any dust or grime with a damp cloth.