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

1‐508‐759‐9500(U.S.andInternational) 5 www.onsetcomp.com

1‐800‐LOGGERS(U.S.only) 

loggerispressedtowakeitup,therebypreservingasmuch

batterypoweraspossible.

12. SelectSoilType:

 Mineral–forcommonsoils,withECvaluesupto8

dS/m.

 Soilless–forpottingsoils,perlite,andpeatmosswith

ECvaluesupto8dS/m.

 Apparent

DielectricPermittivity–rawmeasurements

thatcanbeusedinpublishedequationssuchasthe

Toppequationtoderivesoilmoisturedata.

13. EnableordisablePercentofFieldCapacity–Toseesoil

moistureasthepercentoffieldcapacity,enablethisand

enterthefieldcapacityforthe

soilatthesiteinVolumetric

WaterContentonascaleof0.01to1.00.Notethatthe

PercentofFieldCapacityvaluesreportedwillbelimitedto

therangeof0%to200%.IfyouselectedApparentDielectric

Permittivityasyoursoiltype,theoptionforPercentofField

Capacityisdisabled.

14. SelectwhethertouploaddataviatheHOBOconnectappor

theMXGateway.UsingtheMXGatewayrequiresa

HOBOlinkaccount.

15. Enable/Disablethesensorsthatwillbelogged(MX2307

model)andsetupanyalarmstotripwhenasensorreading

risesaboveorfallsbelow

aspecifiedvalue.SeeSettingup

Alarmsfordetailsonenablingsensoralarms.Notethatfor

theMX2307,temperatureisshownaschannel3.Thisis

becausechannel2isreservedforApparentDielectric

Permittivity,ifthatisselected.

16. Taptosavetheconfigurationsettings,andstart

loggingbasedon

thesettingsyouselected.Pressthestart

buttonontheloggerifitwassetuptostartloggingwitha

buttonpush.SeeDeployingandMounting theLoggerfor

detailsonmountingandseeReadingOuttheLoggerfor

detailsondownloading.

SettingupAlarms

Youcansetupalarmsfortheloggersothatifasensorreading

risesaboveorfallsbelowaspecifiedvalue,theloggeralarm

LEDwillblinkandanalarmiconwillappearintheapp.Thiscan

alertyoutoproblemssoyoucantakecorrectiveaction.

Tosetanalarm:

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 .

3. Tapasensor(taptheEnableLoggingtoggleifnecessary).

4. SelectHighifyouwantanalarm

totripwhenthesensor

readingrisesabovethehighalarmvalue.Dragtheslideror

typeavaluetosetthehighalarmvalue.

5. SelectLowifyouwantanalarmtotripwhenthesensor

readingfallsbelowthelowalarmvalue.Dragtheslideror

typeavaluetosetthelowalarmvalue.

6. FortheDuration,selecthowmuchtimeshouldelapse

beforethealarmtrips,andselectoneofthefollowing:

 Cumulative. The alarmwilltriponcethesensorreadingis

outoftheacceptablerangefortheselecteddurationany

timeduringlogging.Forexample,ifthelowalarmisset

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.

 Consecutive.Thealarmwilltriponcethesensorreading

isoutoftheacceptablerangecontinuouslyforthe

selectedduration.Forexample,ifthelowalarmissetto

0.05

m³/m³

forasoilmoisturealarmandthedurationis

setto30minutes,thealarmwillonlytripifallsensor

readingshavebeenbelow0.05

m³/m

foracontinuous30‐

minuteperiod.

7. TapSave.ForMX2307models,repeatsteps3–7forthe

othersensorifdesired.

8. Intheconfigurationsettings,selectoneofthefollowing

optionstodeterminehowthealarmindicationsarecleared:

 LoggerReconfigured.Thealarmiconindicationwill

displayuntilthenexttimetheloggerisreconfigured.

 SensorinLimits.Thealarmiconindicationwilldisplay

untilthesensorreadingreturnstothenormalrange

betweenanyconfiguredhighandlowalarmlimits.

Whenanalarmtrips,theloggeralarmLEDblinksevery4

seconds(unlessShowLEDisdisabled),

analarmiconappearsin

theapp,andanAlarmTrippedeventislogged.Thealarmstate

willclearwhenthereadingsreturntonormalifSensorinLimits

wasselectedinstep8.Otherwise,thealarmstatewillremainin

placeuntiltheloggerisreconfigured.

Notes:

 Alarm limitsarecheckedateverylogginginterval.For

example,iftheloggingintervalissetto5minutes,the

loggerwillcheckthesensorreadingsagainstthe

configuredhighandlowalarmsettingevery5minutes.

 The actualvaluesforthehighandlowalarmlimitsareset

tothe

closestvaluesupportedbythelogger.Inaddition,

alarmscantriporclearwhenthesensorreadingiswithin

theresolutionspecifications.

 Whenreading outthelogger,alarmeventscanbe

displayedontheplotorinthedatafile.SeeLogger

Events.

BurstLogging

Burstloggingisaloggingmodethatallowsyoutosetupmore

frequentloggingwhenaspecifiedconditionismet.For

example,anMX2307loggerisrecordingdataata5‐minute

loggingintervalandburstloggingisconfiguredtologevery30

secondswhenthetemperaturerisesabove85°F

(thehighlimit)

orfallsbelow32°F(thelowlimit).Thismeanstheloggerwill

recorddataevery5minutesaslongasthetemperature

remainsbetween85°Fand32°F.Oncethetemperaturerises

above85°F,theloggerwillswitchtothefasterloggingrateand

recorddataevery30secondsuntilthetemperaturefallsback

to85°F.Atthattime,loggingresumesevery5minutesatthe

normallogginginterval.Similarly,ifthetemperaturefallsbelow

32°F,theloggerwouldswitchtoburstloggingmodeagainand

recorddataevery30seconds.Oncethetemperaturerisesback

to32°F,the

loggerwillreturntonormalmode,loggingevery5

minutes.Note:Sensoralarms,statistics,andtheStopLogging

option“WrapWhenFull”arenotavailableinburstlogging

mode.