Hobo MX1104 User manual

HOBO®MXAnalog/Temp/RH/Light(MX1104)and
MX4‐ChannelAnalog(MX1105)DataLoggerManual
23968‐B
TheHOBOMXAnalog/Temp/RH/Light(MX1104)andHOBOMX4‐ChannelAnalog(MX1105)
dataloggersmeasureandtransmitdatawirelesslyfromindoorenvironmentstomobiledevices
usingBluetooth®LowEnergytechnology.TheMX1104modelhasintegratedtemperature,
relativehumidity(RH),andlightintensitysensorsandoneanaloginputwhiletheMX1105
modelhasfouranaloginputs.Bothmodelssupportawidevarietyofexternalsensors(sold
separately),includingself‐describingtemperature,split‐coreACcurrenttransformer,4‐20mA
input,andDCvoltageinputsensors.Theself‐describingsensorsaredesignedwithintegrated
strainreliefforasecureconnectiontotheloggersandareautomaticallydetectedbythe
HOBOmobileappforeasysetup.Usingtheapp,youcanconfiguretheloggers,readoutand
viewdata,andexportthedataforfurtheranalysis.Theloggerscancalculateminimum,
maximum,average,andstandarddeviationstatisticsandcanalsobeconfiguredtotripaudible
orvisualalarmsatthresholdsyouspecify.Inaddition,bothloggerssupportburstloggingin
whichdataisloggedatadifferentintervalwhensensorreadingsareaboveorbelowcertain
limits.Thesecompactloggersalsohavebuilt‐inLCDscreenstodisplaycurrentsensorreadings,
loggingstatus,batteryuse,memoryconsumption,andmore.
Specifications
TemperatureSensor(MX1104)
Range‐20°to70°C(‐4°to158°F)
Accuracy±0.20°Cfrom0°to50°C(±0.36°Ffrom32°to122°F)
Resolution0.002°Cat25°C(0.004°Fat77°F)
Drift<0.1°C(0.18°F)peryear
RHSensor*(MX1104)
Range0%to100%at‐20°to70°C(‐4°to158°F);exposuretoconditions
above95%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%andabove90%±5%typical
Resolution0.01%
Drift<1%peryeartypical
ResponseTime(MX1104)
Temperature11minutesinairmoving1m/s(2.2mph)
RH30secondsto90%inairflowof1m/s(2.2mph)
LightSensor(M1104)
Range0to167,731lux(15,582lum/ft2)
Accuracy±10%typicalfordirectsunlight(seeLightMeasurementonpage4for
moredetails)
Loggerwith
CableType
SD‐MA‐420or
CABLE‐4‐
20mA
SD‐VOLT‐2.5
orCABLE‐2.5‐
STEREO
SD‐VOLT‐05
orCABLE‐
ADAP5
SD‐VOLT‐10
orCABLE‐
ADAP10
SD‐VOLT‐24
orCABLE‐
ADAP24
Measurement
Range
0to20.1mA 0to2.5V0to5.0V0to10V0to24V
Accuracy±0.001mA
±0.2%of
reading
±0.1mV
±0.1%of
reading
±0.2mV
±0.3%of
reading
±0.4mV
±0.3%of
reading
±1.0mV
±0.3%of
reading
Resolution0.3µA40µV80µV160µV384µV
Logger
OperatingRange‐20°to70°C(‐4°to158°F)
RadioPower1mW(0dBm)

HOBOMX1104and
MX1105DataLoggers
Models:
Analog/Temp/RH/Light
(MX1104)
4‐ChannelAnalog
(MX1105)
IncludedItems:
Tiewraps
TwoAAA1.5Valkaline
batteries(installed)
RequiredItems:
HOBOmobileapp
DevicewithiOSand
Bluetooth


MX1105ModelShown

HOBOMXAnalog/Temp/RH/Light(MX1104)andMX4‐ChannelAnalog(MX1105)Manual
1‐800‐LOGGERS2www.onsetcomp.com
Specifications(continued) 
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
RestartModePushbutton
TimeAccuracy±1minutepermonthat25°C(77°F)
BatteryTypeTwoAAA1.5Valkalinebatteries,userreplaceable
BatteryLife1year,typicalwithloggingintervalof1minuteandBluetoothAlways
Onenabled;2years,typicalwithloggingintervalof1minuteand
BluetoothAlwaysOndisabled;andtemperaturesbetween0°and
50°C(32°and122°F).Fasterloggingintervalsandstatisticssampling
intervals,burstlogging,remainingconnectedwiththeapp,excessive
downloads,andpagingmayimpactbatterylife.
Memory4MB(1.9millionmeasurements,maximum)
FullMemoryDownloadTimeApproximately4to15minutesdependingonthemobiledevice;may
takelongerthefurtherthedeviceisfromthelogger
LCDLCDisvisiblefrom0°to50°C(32°to122°F);theLCDmayreactslowly
orgoblankintemperaturesoutsidethisrange
Size11.28x5.41x2.92cm(4.44x2.13x1.15in.)
Weight123g(4.34oz)
EnvironmentalRatingIP54

TheCEMarkingidentifiesthisproductascomplyingwithallrelevant
directivesintheEuropeanUnion(EU).
 Seelastpage
*PerRHsensormanufacturerdatasheet
LoggerComponentsandOperation

RHSensor:Thissensorislocatedintheupperleftcornerandto
theleftoftheLCDscreenintheMX1104model.
LightSensor:ThissensorislocatedbelowtheRHsensorandto
theleftoftheLCDscreenintheMX1104model.
TemperatureSensor:Thissensorislocatedinthebottomleft
cornerandtotheleftoftheLCDscreenintheMX1104model.
Asmallpipeprotrudesfromthebottomsideoftheloggercase
toventthetemperaturesensor.
AnalogSensorPort:Usethis2.5mmjacktoconnectaself‐
describingsensororotheranalogsensor.TheMX1104model
hasoneportandtheMX1105modelhasfourports.
TopButton:Pressthisbuttonfor3secondstostartorstop
loggingdata,ortoresumeloggingonthenextevenlogging
interval.ThisrequiresconfiguringtheloggerinHOBOmobile
withapushbuttonstartorstop,andwithAllowButtonRestart
selected(seeSettinguptheLogger).
MX1104Model
AnalogSensor
Port
Bottom
Button
TopButton
LightSensor
Temperature
Sensor(internal)
andVentingPipe
Mounting
Loop
Self‐DescribingSensor
Plug
LCDScreen
MX1105Model
RHSensor

HOBOMXAnalog/Temp/RH/Light(MX1104)andMX4‐ChannelAnalog(MX1105)Manual
1‐800‐LOGGERS3www.onsetcomp.com
Youcanalsopressthetopbuttonfor1secondtowakeupthe
logger,bringtheloggertothetopofthelistinHOBOmobile,
cyclethrougheachchannelontheLCD,silenceabeepingalarm
(seeSettingupAlarms),andturntheLCDscreenonifthe
optiontoturnofftheLCDhasbeenenabled(seeSettingupthe
Logger).
BottomButton:Whenstatisticsarebeinglogged,pressthis
buttonfor1secondtoswitchbetweenthelatestsensor
reading,statistics,andanalarmreading(ifapplicable)forthe
channelcurrentlydisplayed.Ifnostatisticsarebeinglogged
andasensoralarmtrips,pressthisbuttonfor1secondtoview
thealarmreadingforthechannelcurrentlydisplayed.Youcan
alsopressthisbuttonfor1secondtowakeupthelogger,
silenceabeepingalarm,orturntheLCDscreenoniftheoption
toturnofftheLCDhasbeenenabled.Pressthisbuttonfor3
secondstoclearavisualalarmiftheloggerwasconfiguredin
HOBOmobiletomaintainthevisualalarmuntilthealarm
buttonwaspressed(seeSettingupAlarms).Pressboththetop
andbottombuttonssimultaneouslyfor10secondstoreseta
loggerpassword.
Self‐DescribingSensor:Thisisatypeofexternalsensor
availableforMX1104andMX1105loggers.Turnthesensor
plugone‐quarterclockwisewheninsertingitintoananalog
sensorporttosecureitinplace.Thissensoralsofeatures
automaticdetectionbythelogger(seeWorkingwithSensors).
Plug:UsethisSantoprene®(TPE)plugtofillanemptyanalog
sensorport.
MountingLoops:Usethetwomountingloops(onlyonevisible
inthediagrams)tomounttheloggerwithtiewraps(see
MountingtheLogger).
LCDScreen:ThisloggerisequippedwithanLCDscreenthat
displaysdetailsaboutthecurrentstatus.Thisexampleshowsall
symbolsilluminatedontheLCDscreenfollowedbydefinitions
ofeachsymbol.

LCDSymbolDescription

Theloggeriswaitingtobestartedorrestarted.
Pressandholdthetopbuttonfor3secondsto
startthelogger;HOLDwillalsobedisplayed
duringthistime.

Theloggerhasbeenstartedwithpushbuttonstop
enabled.Pressandholdthetopbuttonfor3
secondstostopthelogger;HOLDwillalsobe
displayedduringthistime.

Thisisdisplayedwhilepressingthetopbuttonfor
3secondstostart,stop,orrestartthelogger,or
whilepressingthebottombuttonfor3secondsto
clearanalarm.

Thisisdisplayedwhenthereismorethanone
channelbeinglogged.Pressthetopbuttonto
cyclethrougheachchanneltoviewsensor
measurements.
LCDSymbolDescription

Statisticsarebeinglogged.Pressthebottom
buttontoswitchbetweenthecurrentsensor
readings,statistics,andanyalarmreadingsfor
eachchannel.




Thesesymbolsshowthemaximum,minimum,
average,andstandarddeviationvaluesmost
recentlycalculatedbythelogger(ifthelogging
modehasbeensettoFixedIntervalin
HOBOmobileandeachstatistichasbeenselected;
seeStatisticsLogging).Pressthebottombuttonto
cyclethroughtheavailablestatisticsandthenback
tothecurrentsensorreading(ortothealarm
valueifapplicable).

Thebatteryindicatorshowstheapproximate
batterypowerremaining.

Theloggerhasbeenconfiguredtostoplogging
whenmemoryfills.Thememorybarindicatesthe
approximatespaceremainingintheloggerto
recorddata.Whenfirststarted,allfivesegments
inthebarwillbeempty.Inthisexample,the
loggermemoryisalmostfull(onlyonesegmentin
thememorybarisempty).

Theloggerhasbeenconfiguredtoneverstop
logging(wrapping).Theloggerwillcontinue
recordingdataindefinitely,withnewestdata
overwritingtheoldestdatauntilthebattery
voltageisdepletedortheloggerisreconfigured.
Whenfirstlaunched,allfivesegmentsinthe
memorybarwillbeempty.Inthisexample,the
memoryisfull(allfivesegmentsarefilledin)and
newdataisnowoverwritingtheoldestdata.
Theloggeriscurrentlylogging.

Thisindicatesasensoralarmhastripped.Press
thetopbuttontoviewthechannelwiththealarm
icon.Pressthebottombuttontoviewthereading
thattrippedthealarm.The“alm”symbol
(describedbelow)isdisplayedonthescreenwith
thereading(ordashesifthealarmhasalready
cleared).Thissymbolatleftwillcleardepending
onhowvisualalarmswereconfiguredin
HOBOmobile.Ifthevisualalarmwassettoclear
whentheloggerisreconfigured,thissymbolwill
remainontheLCDuntilthenexttimenew
configuresettingsareloadedontothelogger(see
SettinguptheLogger).Otherwise,itwillclear
whenthesensorreadingisbackwithinthealarm
limitsorbypressingthebottombuttonfor3
seconds.

Thisisdisplayedwiththereadingthattrippedthe
alarm.Whileviewingthechannelwiththealarm,
pressthebottombuttontoseethereading(you
mayneedtocyclethroughstatisticsreadingsfirst
ifapplicable).Ifthealarmcleared,dashes(‐‐‐‐)
willdisplayinsteadofareading.

Avisualalarmisreadytobecleared.Thiswillonly
appearifHOBOmobilewasconfiguredtomaintain
thevisualalarmuntilthealarmbuttonispressed.
Whileviewingthechannelwiththealarmonthe
LCD,pressthebottombuttonfor3secondsto
clearthevisualalarm.Notethatanaudiblealarm
canbesilencedbypressingthetoporbottom
buttonfor1second.

Thisindicatesaproblemwithanexternalsensor.
SeeWorkingwithExternalSensorsformore
details.

HOBOMXAnalog/Temp/RH/Light(MX1104)andMX4‐ChannelAnalog(MX1105)Manual
1‐800‐LOGGERS4www.onsetcomp.com
LCDSymbolDescription

Thisisanexampleofasensorreading,withthe
latestreadingdisplayedabovetheunittypefor
thatsensor.ToswitchbetweenUSandSIunits,
changetheunitsintheHOBOmobileSettings(the
loggermustbereconfiguredforunitschangesto
takeeffect).Note:Ifthesensorvalueexceedsfive
digits,thenthescientificnotationE3isappended
tothevalueontheLCDtosignifythatthe
displayeddigitsaremultipliedby1,000.For
example,avalueof100,000isdisplayedas100E3
ontheLCD.ThisonlyaffectstheLCD;loggeddata
containsalldigits.

Theloggerhasbeenconfiguredtostartloggingon
aparticulardate/time.Thedisplaywillcountdown
indays,hours,minutes,andsecondsuntillogging
begins.Inthisexample,5minutesand38seconds
remainuntilloggingwillbegin.

Theconfiguresettingsarebeingloadedontothe
loggerfromHOBOmobile.

TheloggerhasbeenstoppedwithHOBOmobileor
becausethememoryisfull.
Notes:
YoucandisabletheLCDscreenwhenlogging.Deselect
“ShowLCD”whensettinguptheloggerasdescribedin
thenextsection.Whenthisoptionisdisabled,youcan
stilltemporarilyviewtheLCDscreenbypushingthetop
orbottombuttonfor1second.TheLCDwillthenremain
onfor10minutes.
TheLCDscreenrefreshesatthesamerateasthelogging
interval.
Whentheloggerhasstoppedlogging,theLCDscreenwill
remainonwith“STOP”displayeduntiltheloggeris
offloadedtoyourmobiledevice(unlesstheloggerwas
configuredwiththe“ShowLCD”optiondisabled).Once
theloggerhasbeenoffloaded,theLCDwillturnoff
automaticallyafter1hour.TheLCDwillturnbackonthe
nexttimeyoupressthetoporbottombuttontowakeup
thelogger.
TheLCDscreenflashes“HELLO”whenyoupagethe
loggerfromHOBOmobile(seeDownloadingHOBOmobile
andConnectingtoaLogger).
TheLCDscreenflashes“BOOT”whenafirmwareupgrade
isunderway.
TheLCDscreenflashes“CHIRPOFF”whenanaudible
alarmiscleared.
ButtonFunctionalityQuickReference
ButtonPressfor1secondto:
Pressand
holdfor
3secondsto:
Pressand
holdfor10
secondsto:
Top
button
Cyclethrougheach
channeltoviewthe
latestsensorreadings
Wakeupthelogger
Bringtheloggertothe
topofthelistin
HOBOmobile
Silenceabeeping
alarm
TurnonLCD
Start,stop,or
resume
logging
(dependingon
settings
chosenin
HOBOmobile)
NA
ButtonPressfor1secondto:
Pressand
holdfor
3secondsto:
Pressand
holdfor10
secondsto:
Bottom
button
Cyclethroughany
statisticsandalarm
readingsforthe
channelcurrently
displayed(if
applicable)
Wakeupthelogger
Silenceabeeping
alarm
TurnonLCD
Clearanalarm
forthe
channel
currently
displayed
(dependingon
thesettings
chosenin
HOBOmobile)
NA
Both
buttons
NANAReseta
password
LightMeasurement(MX1104)
TheMX1104loggermeasureslightintensityinunitsof
lumens/ft
2
orlux.ThelightsensorintheMX1104hasaspectral
responsethattightlymatchesthephotopicresponseofthe
humaneye.ThisisshowninPlotA.
Thelightsensorhasrangeof0to167,731lux(15,582lum/ft
2
).
Theresolutionofthelightmeasurementvariesfrom1unitof
luxorlum/ft
2
inverydimlightto40lux(4lum/ft
2
)forafull
scalemeasurement.

PlotA
LightMeasurementAccuracy
AlthoughtheMX1104isfactorycalibratedtoaccountforthe
lightattenuationoftheplasticenclosure,youmaynoticea
differenceintheMX1104readingcomparedtoacommercially
availableluxmeter.Ideally,alightmeter’sresponseshouldbe
proportionaltothecosineoftheangleatwhichthelightis
incident.TheMX1104doesnotcollectlightexactlyaccordingto
thisrule.PlotBillustratesthedifferencebetweenanideal
cosineresponseandtheapproximateresponseoftheMX1104.
TheMX1104iscalibratedtogivebestresultsfordirect
illumination,butthisisnotalwaysthecase.

HOBOMXAnalog/Temp/RH/Light(MX1104)andMX4‐ChannelAnalog(MX1105)Manual
1‐800‐LOGGERS5www.onsetcomp.com

PlotB
TheMX1104isalsocalibratedtogivebestresultsinthe
sunlight.Becauseartificialindoorandoutdoorlightshave
differentspectralpropertiesthansunlight,theMX1104may
showanerrorofgreaterthan±10%whencomparedtoa
commerciallyavailableluxmeterinthesesituations.Multiple
MX1104loggers,however,willtypicallyexhibit±10%
agreementwitheachotherinanytypeoflight.
DownloadingHOBOmobileand
ConnectingtoaLogger
InstalltheHOBOmobileapptoconnecttoandworkwiththe
logger.
1. DownloadHOBOmobile.GototheAppStore®and
downloadtheHOBOmobileapptoyourphoneortablet.
2. OpenHOBOmobile.EnableBluetoothinyourdevice
settingsifprompted.
3. Connecttothelogger.TaptheDevicesiconandthentap
Loggersatthetopofthescreen.Theloggershouldappear
intheInRangelistasshownhere.

Taptherowinthelisttoconnecttothelogger.Ifitdoes
notappearinthelist,makesuretheloggeriswithinrange
ofyourmobiledevice.Notethatsensorreadingsarevisible
inthislisteveniftheloggerisnotlogging.Dashesare
displayedforchannelsthatarenotenabled.
Tipsforconnecting:
IftheloggerwasconfiguredwithBluetoothAlwaysOn
disabled(seeSettinguptheLogger),makesurethe
loggeris“awake”bypressingthetoporbottombutton.
Pressthetopbuttonagaintobringtheloggertothetop
ofthelistifyouareworkingwithmultipleloggers.
Makesuretheloggeriswithinrangeofyourmobile
device.Therangeforsuccessfulwirelesscommunication
isapproximately30.5m(100ft)withfullline‐of‐sight.
Ifyourdevicecanconnecttotheloggerintermittentlyor
losesitsconnection,moveclosertothelogger,within
sightifpossible.
Changetheorientationofyourphoneortablettoensure
theantennainyourdeviceispointedtowardthelogger.
Obstaclesbetweentheantennainthedeviceandthe
loggermayresultinintermittentconnections.
IftheloggerappearsintheInRangelist,butyoucannot
connecttoit,closeHOBOmobileandpowercyclethe
mobiledevice.ThisforcesthepreviousBluetooth
connectiontoclose.
Onceconnectedtothelogger,youcanselectoneofthe
followingactions:
Configure.Selectloggersettingsandloadthemontothe
loggertostartlogging.SeeSettinguptheLogger.
Readout.Offloadloggerdata.SeeReadingOutthe
Logger.
FullStatusDetails.Checkthebatterylevelandviewthe
configurationsettingscurrentlyselectedforthelogger.
StartLoggingorRestartLogging.Theseoptionsappear
dependingontheStartLoggingandStopLoggingsettings
selectedinthenextsection.
StopLogging.Stoptheloggerfromrecordingdata(this
overridesanyStopLoggingsettingsdescribedinSetting
uptheLogger).
Page.PressandholdthePageiconandtheloggerwill
beeptohelpyoulocateadeployedlogger(tapthePage
iconifyouonlywanttheloggertobeeponce).“HELLO”
alsoappearsontheLCDwhentheloggerispaged.
ClearAudibleAlarm.Ifaudiblealarmsareenabledas
describedinSettingupAlarms,usethistocleara
beepingalarmonthelogger.
LoggerPassword.Selectthistocreateapasswordforthe
loggerthatwillberequiredifanothermobiledevice
attemptstoconnecttoit.Toresetapassword,
simultaneouslypressboththetopandbottombuttonfor
10secondsortapResettoFactoryDefaultintheSet
LoggerPasswordscreen.
UpdateFirmware.Whennewloggerfirmwareis
available,thisactionappearsinthelist.Selectitand
followtheinstructionsonthescreen.Aloggerreadout
willbecompletedautomaticallyatthebeginningofthe
firmwareupdateprocess.Iftheconnectionislost
betweentheloggerandthemobiledeviceduringthe
firmwareupdate,aFirmwareUpdatePendingStatus
displaysfortheloggerwhenyoutapDeviceandthen
Loggers.ConnecttotheloggerandselectRestoreLogger
(orUpdateFirmwareifthatoptionisavailable)to
continueupdatingthefirmware.
Important:Beforeupdatingthefirmwareonthe
logger,checktheremainingbatterylevelbyselecting
FullStatusDetailsandmakesureitisnolessthan30%.
Makesureyouhavethetimetocompletetheentire
updateprocess,whichrequiresthattheloggerremains
connectedtothemobiledeviceduringtheupgrade.
ForceOffload.Thismayappearifanerrorwas
encounteredwhenloadingconfiguresettings.Selectthis

HOBOMXAnalog/Temp/RH/Light(MX1104)andMX4‐ChannelAnalog(MX1105)Manual
1‐800‐LOGGERS6www.onsetcomp.com
tooffloadallthedataontheloggerbeforereconfiguring
it.
SettinguptheLogger
UseHOBOmobiletosetupthelogger,includingsettingalarms,
selectingtheoptionstostartandstoplogging,andchoosinga
loggingmode.Thesestepsprovideanoverviewofsettingup
thelogger.Forcompletedetails,seetheHOBOmobileUser’s
Guideatwww.onsetcomp.com/manuals/17841‐hobomobile‐
users‐guide.
1. Ifyouareusingananalogsensor,insertthesensorpluginto
thesensorport.Forself‐describingsensors,turnthesensor
plugone‐quarterclockwiseuntilitstops.SeeWorkingwith
ExternalSensorsformoredetails.
2. TaptheDevicesiconandthentapLoggersatthetopofthe
screen.Taptheloggertoconnecttoit.Iftheloggerwas
configuredwithBluetoothAlwaysOndisabled,pressa
buttonontheloggertowakeitup.Whenworkingwith
multipleloggers,youcanpressthetopbuttononthelogger
tobringittothetopofthelist.
3. Onceconnected,tapConfigure.

4. TapNameandtypeanamefortheloggerupto20
characters(optional).TapDone.
5. TapGrouptoaddtheloggertotheFavoritesgroup,an
existingcustomgroup,orcreateanewgroupnamewithup
to20characters(optional).TapDone.
6. TapLoggingIntervalandchoosehowfrequentlythelogger
willrecorddataunlessoperatinginburstloggingmode(see
BurstLogging).
7. TapStartLoggingandselectwhenloggingwillbegin:
Now.LoggingwillbeginimmediatelyaftertappingStart
intheConfigurescreen.
OnNextLoggingInterval.Loggingwillbeginatthenext
evenintervalasdeterminedbytheselectedlogging
interval.
OnButtonPush.Loggingwillbeginonceyoupressthe
Start/Stoploggingbuttonontheloggerfor3seconds.
OnDate/Time.Loggingwillbeginatadateandtimeyou
specify.SelectthedateandtimeandtapDone.
TapDone.
8. TapStopLoggingandselecttheoptionsforwhenlogging
willend.
a. Chooseoneoftwomemoryoptions:
WhenMemoryFills.Theloggerwillcontinuerecording
datauntilthememoryisfull.
Never(WrapWhenFull).Theloggerwillcontinue
recordingdataindefinitely,withnewestdata
overwritingtheoldest.Thisoptionisnotavailableif
theLoggingModeissettoBurst(seeBurstLogging).
b. SelectOnButtonPushifyouwanttobeabletostop
loggingbypushingthetopbuttonontheloggerfor3
seconds.NotethatifyoualsochooseOnButtonPushfor
theStartLoggingoption,thenyouwillnotbeabletostop
logginguntil30secondsafterloggingbegins.
IfyouselectOnButtonPushfortheStopLoggingoption,
thenyoualsohavetheoptiontoselectAllowButton
Restart.Thisallowsyoutostopandthenresumelogging
duringthedeploymentbypushingthetopbuttononthe
loggerfor3seconds.
Important:WhenAllowButtonRestartisselectedand
youusethetopbuttonontheloggertostopandrestart
logging,loggingwillrestartonthenextevenlogging
interval,notatthetimethebuttonwaspushed.For
example,aloggerstartedloggingat7:00AMwitha
loggingintervalsetto1hour.Ifyoupressthetopbutton
tostoptheloggerat8:45AMandthenpressthebutton
againat10:15AM,loggingwillnotbeginimmediatelyat
10:15AM.Instead,loggingwillbeginagainat11:00AM,
whichisthenextevenintervaltimebasedonyour1‐hour
logginginterval.Therefore,dependingonthelogging
interval,thegapbetweenthetimeyoupressthebutton
toresumeloggingandthetimeactualloggingbegins
couldbesignificant.Thefasterthelogginginterval,the
lesstimewillelapsebeforeloggingresumes.
c. Selectoneofthefollowingtimeoptionsforwhentostop
logging:
Never.Selectthisifyoudonotwanttheloggertostop
atanypredeterminedtimeframe.
OnDate/Time.Selectthisifyouwanttheloggerto
stoploggingonaspecificdateandtime.Selectthe
dateandtimeandthentapDone.
After.Selectthisifyouwanttocontrolhowlongthe
loggershouldcontinueloggingonceitstarts.Choose
theamountoftimeyouwanttheloggertologdata
andthentapDone.Forexample,select30daysifyou
wanttheloggertologdatafor30daysafterlogging
begins.
d. TapDone.
9. Makesureallchannelsyouwanttologareenabledand
thendothefollowing:
Forself‐describingsensors,thesensortypewillbe
automaticallydetected.Tapthesensorifyouwantto
enteralabel,setupalarms,oraddscaling.
Forotherexternalsensors,thesensortypewillnotbe
automaticallydetected.Enablethechannelandthentap
ittoenteralabel(optional).Selectthetypeofsensoror
cablefromthelistandtapDone.Setupalarmsandadd
scalingifneededandthentapDone.
SeeWorkingwithExternalSensorsandSettingupAlarms
foradditionaldetails.
10. TapLoggingMode.Selecteitherfixedintervalloggingor
burstlogging.Withfixedintervallogging,theloggerrecords
dataforallenabledsensorsand/orselectedstatisticsatthe

HOBOMXAnalog/Temp/RH/Light(MX1104)andMX4‐ChannelAnalog(MX1105)Manual
1‐800‐LOGGERS7www.onsetcomp.com
loggingintervalselected(seeStatisticsLoggingfordetails
onchoosingstatisticsoptions).Inburstmode,logging
occursatadifferentintervalwhenaspecifiedconditionis
met.SeeBurstLoggingformoreinformation.TapDone.
11. EnableordisableShowLCD,whichcontrolswhetherthe
LCDontheloggerwillremainilluminatedwhiletheloggeris
logging.IfyoudisableShowLCD,theLCDontheloggerwill
notshowthecurrentreading,status,orotherinformation
whiletheloggerislogging.Youwill,however,beableto
temporarilyturntheLCDscreenonbypressingeither
buttonontheloggerfor1second.Inaddition,youcan
alwaysviewthestatusofanyin‐rangeloggeronyour
mobiledeviceregardlessofthelogger’sLCDsetting(may
requirealoggerpasswordasapplicable).
12. TapStartintheupperrightcorneroftheConfigurescreen
toloadthesettingsontotheloggerifyouarereadytostart.

Loggingwillbeginbasedonthesettingsyouselected.Deploy
theloggerusingthemountingmaterials(seeMountingthe
Logger).Afterloggingbegins,youcanreadouttheloggerat
anytime(seeReadingOuttheLoggerfordetails).Note:Ifan
“ErrorConfiguringLogger”messageappearsinHOBOmobile,
anerroroccurredwhileloadingtheconfiguresettingsonto
thelogger.Tryreconfiguringthelogger.
WorkingwithExternalSensors
TheMX1104hasoneanalogsensorportandtheMX1105has
fouranalogsensorportsthatcanacceptself‐describingand
otherexternalsensors.Refertowww.onsetcomp.comfora
currentlistofsupportedsensors.
Toconnectanexternalsensor:
1. Makesuretheloggerisstopped.
2. Forself‐describingsensors,inserttheplugintoananalog
sensorportasshown.

3. Forotherexternalsensors,insertthesensorintoananalog
sensorportandmakesureitisfirmlyseated.
4. Ifyouneedtoconnectasensortothesensorcable,
completeanywiringbeforeloggingbegins.Refertothe
sensororcablemanualformoreinformationonconnecting
thesensorandwiring,ifapplicable.
5. InHOBOmobile,taptheDevicesiconandthentapLoggers.
Taptheloggertoconnecttoit.Iftheloggerwasconfigured
withBluetoothAlwaysOndisabled,pressabuttononthe
loggertowakeitup.Whenworkingwithmultipleloggers,
youcanpressthetopbuttonontheloggertobringittothe
topofthelist.
6. Onceconnected,tapConfigure.
7. UnderSensor&AlarmSetup,makesureallexternalsensor
channelsareenabled.
8. Forself‐describingsensors,thesensortypewillbe
automaticallydetected.Tapthesensortoenteralabel
(optional).Tosetupscaling,tapScalingandthenenterthe
SeriesName,Unit,andvaluesforHighandLowandthen
tapDone.SeeSettingupAlarmsfordetailsonadding
alarms.TapDoneinthesensorconfigurationscreentosave
allsensorchanges.
Forotherexternalsensors,thesensortypewillnotbe
automaticallydetected.Enablethechannelandthentapit
toenteralabel(optional).Selectthetypeofsensororcable
fromthelistandtapDone.Tosetupscaling,tapScalingand
thenentertheSeriesName,Unit,andvaluesforHighand
LowandthentapDone.SeeSettingupAlarmsfordetailson
addingalarms.TapDoneinthesensorconfigurationscreen
tosaveallsensorchanges.
9. TapStartintheConfigurescreentoloadthesettingsonto
theloggerifyouarereadytostart.
Notes:
ForMX1104loggers,anexternalsensorischannel1.For
MX1105loggers,thesensorchannelnumberislisted
abovetheanalogsensorportwheretheexternalsensor
isconnected.
TheConfigurescreeninHOBOmobilewillautomatically
updatetoshowwhenasensorisdisconnectedor
connected.
Makesureyouselectthecorrectsensortypein
HOBOmobileifyouarenotusingself‐describingsensors.
Ifyouselectthewrongtype,thenincorrectdatawillbe
logged.HOBOmobilecanonlyautomaticallydetectthe
sensortypeforself‐describingsensors.
Ifyoudisconnectasensororifitisnotfullyinsertedinto
theanalogsensorportwhiletheloggerislogging,a
warningiconappearsontheLCDandtheloggerwillbeep
once.Usethetopbuttonontheloggertoviewthe
channelwiththewarning,whichalsodisplaysdashes
insteadofavalidcurrentreading.Erroneousreadingswill
bedisplayedinHOBOmobileandloggeddependingon
theloggingintervalwhilethesensorisdisconnected(e.g.
ifasensorisdisconnectedfor5minutesandthelogging
intervalissetto1minute,thentherewillbe5erroneous
datapointswhilethesensorwasdisconnected).When
thesensorisreconnected,thewarningiconwillclear,the
correctvaluewillreplacethedashesforthechannelon
theLCD,andthecorrectreadingswillbelogged.
Usingthediagramonthe
loggerhousingshownaboveas
reference,insertthepluginto
theanalogsensorport.
Turntheplugone‐
quarterclockwise.
Theflatpartoftheplugwillbe
facingupwhenproperlyinstalled.
a.b.
c.d.

HOBOMXAnalog/Temp/RH/Light(MX1104)andMX4‐ChannelAnalog(MX1105)Manual
1‐800‐LOGGERS8www.onsetcomp.com
Donotswapoutsensorsormovesensorstoemptyports
whiletheloggerislogging.Stoptheloggerbeforemaking
anyphysicalchangestothesensors.
Ifawarningiconappearsforaself‐describingsensorand
youhavecheckedthatthecorrectsensorisproperly
installed,thenthesensormightbefaulty.ContactOnset
TechnicalSupport.
The4‐20mAinputcable(SD‐MA‐420orCABLE‐4‐20mA)
measurescurrentfrom0to20.1mA.Donotexposeto
currentabove20mAortonegativecurrent.Donotcut
offtheendofthegraycablewhereitconnectstothe
blueandyellowwiresasitcontainstheprecisionresistor
requiredforcurrentmeasurement.
IfyouareusingtheSD‐VOLT‐2.5orCABLE‐2.5‐STEREO
voltageinputcable,theinputlinemustnotbeexposed
tosignalsbelow0Vorabove2.5V.Thevoltageinput
cableconnectionsareasfollows:
WireConnection
RedSwitched2.5Voutput
WhiteVoltageinput
BlackGround
Theexternalinputchannelshaveaswitched2.5V
output.Thissignalcanbeusedtopowerasensordirectly
ortotriggeranexternalcircuit.Externalsensorsshould
drawnomorethan4mAtotalwhenpowered.
Theswitched2.5Voutputturnsonabout5msbefore
theexternalchannelsaremeasuredasshowninthe
followingdiagramforanMX1105logger.Theshaded
areashowsthe100msperiodforeachenabledchannel
duringwhichtheloggersamplestheinputsignals.

Whenusingmultiplevoltageand/orcurrentinputs,the
(‐)fromthecurrentsource(s)andthe0Vlinefromthe
voltagesource(s)aretiedtogetheratthelogger.Ifthese
linesareatdifferentvoltagepotentials,thismaycause
inaccuratereadingsorevendamageyourlogger.
WARNING:Analogchannelinputcannotexceed2.5
VDC.Forsensoroutputsupto24VDC,usethe
appropriatevoltageadaptercable(SD‐VOLT‐xxor
CABLE‐ADAPX).
SettingupAlarms
Youcansetanalarmtotripontheloggerwhenasensor
readingrisesaboveorfallsbelowaspecifiedvalue.Thiscan
alertyoutoproblemssoyoucantakecorrectiveaction.Toset
analarm:
1. TaptheDevicesiconandthentapLoggersatthetopofthe
screen.Taptheloggertoconnecttoit.Iftheloggerwas
configuredwithBluetoothAlwaysOndisabled,pressa
buttonontheloggertowakeitup.Whenworkingwith
multipleloggers,youcanpressthetopbuttononthelogger
tobringittothetopofthelist.
2. Onceconnected,tapConfigure.
3. InSensor&AlarmSetup,tapanenabledsensor.
4. TapAlarmsinthesensorconfigurationscreen.
5. EnabletheHighAlarmifyouwantanalarmtotripwhenthe
sensorreadingrisesabovethehighalarmvalue.Dragthe
slidertothereadingthatwilltripthealarmortapthevalue
fieldandtypeaspecificreading.Inthefollowingexample,a
temperaturesensoralarmwilltripwhenthetemperature
risesabove85°F.

6. EnabletheLowAlarmifyouwantanalarmtotripwhenthe
sensorreadingfallsbelowthelowalarmvalue.Dragthe
slidertothereadingthatwilltripthealarmortapthevalue
fieldandtypeaspecificreading.Inthepreviousexample,a
temperaturesensoralarmisconfiguredtotripwhenthe
temperaturefallsbelow32°F.
Note:Theactualvaluesforthehighandlowalarmlimitsare
settotheclosestvaluesupportedbythelogger.
7. UnderRaiseAlarmAfter,selectthedurationbeforean
alarmistripped.
8. IfyouselectCumulativeSamples,thenthealarmwilltrip
whenthetimethesensorisoutofrangeoverthecourseof
thedeploymentisequaltotheselectedduration.Ifyou
selectConsecutiveSamples,thenthealarmwilltripwhen
thetimethesensoriscontinuouslyoutofrangeisequalto
theselectedduration.Forexample,thehighalarmfora
temperaturesensorissetto85°Fandthedurationissetto
30minutes.IfCumulativeisselected,thenanalarmwilltrip
onceasensorreadinghasbeenatorabove85°Fforatotal
of30minutessincetheloggerwasconfigured;specifically,
thiscouldbe15minutesabove85°Finthemorningand
then15minutesabove85°Fagainintheafternoon.If
Consecutiveisselected,thenanalarmwilltriponlyifall
sensorreadingsare85°Foraboveforacontinuous30‐
minuteperiod.
9. TapDoneinthealarmconfigurationscreenandthentap
Doneagaininthesensorconfigurationscreen.
10. Repeatsteps3–9foranyothersensorsifdesired.
11. BackinthemainConfigurescreen,enableAudibleAlarmsif
youwantabeeptosoundontheloggerevery30seconds
whenthesensoralarmtrips.Thebeepingwillcontinueuntil
thealarmisclearedfromHOBOmobile,eitherbuttononthe
loggerispressed,or7dayshavepassed.Batterylifewillbe

HOBOMXAnalog/Temp/RH/Light(MX1104)andMX4‐ChannelAnalog(MX1105)Manual
1‐800‐LOGGERS9www.onsetcomp.com
slightlyreducedwhenthissettingisenabled.Itis
recommendedthatyouonlyenablethisfeatureifyouhave
regularaccesstotheloggersothatyoucaneasilyturnoff
thebeeping.
12. AlsointheConfigurescreen,selectoneofthefollowing
optionstodeterminehowlongthealarmiconwillremain
illuminatedontheloggerLCDscreenafteranalarmtrips:
LoggerReconfigured.Thealarmiconwillremainvisible
ontheLCDuntilthenexttimetheloggerisreconfigured.
SensorinLimits.Thealarmiconwillremainvisibleonthe
LCDuntilthesensorreadingreturnstothenormalrange
betweenanyconfiguredhighandlowalarmlimits.
AlarmButtonPressed.Thealarmiconwillremainvisible
untilyoupressthebottombuttononthelogger.
13. TapStartintheConfigurescreentoloadthealarmsettings
ontotheloggerifyouarereadytostart.
Notes:
ThealarmiconwillbeilluminatedontheloggerLCD
whenthealarmtrips.Youcanalsopressthebottom
buttonontheloggertoviewthefarthestout‐of‐range
valueduringthedeployment.Dasheswillappearinstead
ofavalueoncethealarmisclearedonthechannel.
Alarmlimitsarecheckedatthesamerateasthelogging
interval.
Theactualvaluesforthehighandlowalarmlimitsareset
totheclosestsupportedvalue.Inaddition,alarmscan
triporclearwhenthereadingiswithintheresolution
specifications.Thismeansthevaluethattriggersthe
alarmmaydifferslightlythanthevalueentered
Whenyoureadoutthelogger,alarmeventscanbe
displayedontheplotorinthedatafile.SeeRecording
InternalLoggerEvents.
Oncecleared,anaudiblealarmwillstartbeepingagainif
thesensorvaluesgooutofthenormalrange.Evenifan
audiblealarmiscleared,avisualalarmmayremainon
theloggerLCDandinHOBOmobiledependingonthe
settingsselectedformaintainingvisualalarmsorbecause
thealarmconditionmaystillbeineffect.Inaddition,an
audiblealarmwillcontinuebeepingwhenthesensor
valueshavereturnedtothenormalrangeuntilitis
clearedasdescribedinstep11.
Althoughanaudiblealarmandavisualalarmcanoccur
atthesametimewhenasensoralarmistripped,theyare
clearedindifferentways.Theaudiblealarmcanbe
clearedasdescribedinstep11.Meanwhile,avisual
alarmisclearedasdeterminedbythesettingselectedfor
MaintainVisualAlarmUntilintheConfigurescreen.This
meansyoucouldclearabeepingaudiblealarmandthe
visualalarmwillremainontheLCDandinHOBOmobile
untiltheloggerisreconfigured,thesensorisinlimits,or
thebottombuttonontheloggerispressed‐‐whichever
settingyouselected.
Iftheloggerwasconfiguredtostoploggingwithabutton
push,anytrippedalarmswillbeclearedautomatically
whenloggingisstoppedandnoAlarmClearedeventwill
beloggedinthedatafile.Thisensuresthattheloggerwill
startcheckingforalarmconditionswhenloggingresumes
(iftheloggerwasconfiguredwithAllowButtonRestart
selected).
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,aloggerisrecordingdataata5‐minutelogging
intervalandburstloggingisconfiguredtologevery30seconds
foratemperaturesensor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32°Fand85°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then
resumesevery5minutesatthenormallogginginterval.
Similarly,ifthetemperaturefallsbelow32°F,then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then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.
Tosetupburstlogging:
1. TaptheDevicesiconandthentapLoggersatthetopofthe
screen.Taptheloggertoconnecttoit.Iftheloggerwas
configuredwithBluetoothAlwaysOndisabled,pressa
buttonontheloggertowakeitup.Whenworkingwith
multipleloggers,youcanpressthetopbuttononthelogger
tobringittothetopofthelist.
2. Onceconnected,tapConfigure.
3. TapLoggingModeandthentapBurstLogging.
4. TapasensorunderBurstSensorLimits.
5. EnableHighLimitifyouwantburstloggingtooccurwhen
thesensorreadingrisesaboveaspecificreading.Dragthe
slidertothereadingthatwilltriggerburstloggingortapthe
valuefieldandtypeaspecificreading.Inthefollowing
exampleforatemperaturesensor,theloggerwillswitchto
burstloggingwhenthetemperaturerisesabove85°F.

6. EnableLowLimitifyouwantburstloggingtooccurwhen
thesensorreadingfallsbelowaspecificreading.Dragthe
slidertothereadingthatwilltriggerburstloggingortapthe
valuefieldandtypeaspecificreading.Intheprevious
exampleforatemperaturesensor,theloggerwillswitchto
burstloggingwhenthetemperaturefallsbelow32°F.
7. TapDoneandrepeatsteps4–7foranyothersensorsif
desired.
8. TapBurstLoggingIntervalandselectanintervalfasterthan
thelogginginterval.Keepinmindthatthemorefrequent
theburstloggingrate,thegreatertheimpactonbatterylife
andtheshortertheloggingduration.TapDone.
9. TapDonetoexittheLoggingModescreen.

HOBOMXAnalog/Temp/RH/Light(MX1104)andMX4‐ChannelAnalog(MX1105)Manual
1‐800‐LOGGERS10www.onsetcomp.com
10. TapStartintheConfigurescreentoloadtheburstsettings
ontotheloggerifyouarereadytostart.
Notes:
Burstlimitsarecheckedatthesamerateasthelogging
interval.Whentheloggerentersburstloggingmode,the
LCDwillupdateatthesamerateasthenewburstlogging
interval.
Ifhighand/orlowlimitshavebeenconfiguredformore
thanonesensor,thenburstloggingwillbeginwhenany
highorlowconditiongoesoutofrange.Burstloggingwill
notenduntilallconditionsonallsensorsarebackwithin
normalrange.
Theactualvaluesfortheburstlogginglimitsaresetto
theclosestvaluesupportedbythelogger.
Burstloggingmodecanbeginorendwhenthesensor
readingiswithinthespecifications.Thismeansthevalue
thattriggersburstloggingmaydifferslightlythanthe
valueentered.
Oncethehighorlowconditionclears,thelogging
intervaltimewillbecalculatedusingthelastrecorded
datapointinburstloggingmode,notthelastdatapoint
recordedin“normalmode.”Forexample,let’sassume
theloggerhasa10‐minuteloggingintervalandloggeda
datapointat9:05.Then,thehighlimitwassurpassed
andburstloggingbeganat9:06.Burstloggingthen
continueduntil9:12whenthesensorreadingfellback
belowthehighlimit.Nowbackinnormalmode,thenext
loggingintervalwillbe10minutesfromthelastburst
loggingpoint,or9:22inthiscase.Ifburstlogginghadnot
occurred,thenextdatapointwouldhavebeenat9:15.
ANewIntervaleventiscreatedeachtimethelogger
entersorexitsburstloggingmode.SeeRecording
InternalLoggerEventsfordetailsonplottingandviewing
theevent.Inaddition,iftheloggerisstoppedwitha
buttonpushwhileinburstloggingmode,thenaNew
Intervaleventisautomaticallyloggedandtheburst
conditioniscleared,eveniftheactualhighorlow
conditionhasnotcleared.Theloggerwillcheckthehigh
andlowconditionswhenloggingresumes(ifthelogger
wasconfiguredwithAllowButtonRestartselected).
StatisticsLogging
Duringfixedintervallogging,theloggerrecordsdatafor
enabledsensorsand/orselectedstatisticsatthelogging
interval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:
Themaximum,orhighest,sampledvalue,
Theminimum,orlowest,sampledvalue,
Anaverageofallsampledvalues,and
Thestandarddeviationfromtheaverageforallsampled
values.
Forexample,theMX1104loggerisconfiguredwithonlythe
temperatureandRHsensorsenabled,andthelogginginterval
setto5minutes.Theloggingmodeissettofixedinterval
loggingwithNormalandallfourstatisticsenabledandwitha
statisticssamplingintervalof30seconds.Onceloggingbegins,
theloggerwillmeasureandrecordtheactualtemperatureand
RHsensorvaluesevery5minutes.Inaddition,theloggerwill
takeatemperatureandRHsampleevery30secondsand
temporarilystoretheminmemory.Theloggerwillthen
calculatethemaximum,minimum,average,andstandard
deviationusingthesamplesgatheredovertheprevious5‐
minuteperiodandlogtheresultingvalues.Whenreadingout
thelogger,thiswouldresultin10dataseries(notincludingany
derivedseries,suchasdewpoint):twosensorseries(with
temperatureandRHdataloggedevery5minutes)pluseight
maximum,minimum,average,andstandarddeviationseries
(fourfortemperatureandfourforRHwithvaluescalculated
andloggedevery5minutesbasedonthe30‐secondsampling).
Tologstatistics:
1. TaptheDevicesiconandthentapLoggersatthetopofthe
screen.Taptheloggertoconnecttoit.Iftheloggerwas
configuredwithBluetoothAlwaysOndisabled,pressa
buttonontheloggertowakeitup.Whenworkingwith
multipleloggers,youcanpressthetopbuttononthelogger
tobringittothetopofthelist.
2. Onceconnected,tapConfigure.
3. TapLoggingModeandthenselectFixedIntervalLogging.
4. SelectNormaltorecordthecurrentreadingforeach
enabledsensorattheloggingintervalshownatthetopof
thescreen.Donotselectthisifyouonlywanttolog
statistics.
5. Selectthestatisticsyouwanttheloggertorecordateach
logginginterval:Maximum,Minimum,Average,and
StandardDeviation(averageisautomaticallyenabledwhen
selectingStandardDeviation).Statisticswillbeloggedforall
enabledsensors.Inaddition,themorestatisticsyourecord,
theshortertheloggerdurationandthemorememoryis
required.
6. TapStatisticsSamplingIntervalandselecttheratetouse
forcalculatingstatistics.Theratemustbelessthan,anda
factorof,thelogginginterval.Forexample,ifthelogging
intervalis1minuteandyouselect5secondsforthe
samplingrate,thentheloggerwilltake12samplereadings
betweeneachlogginginterval(onesampleevery5seconds
foraminute)andusethe12samplestorecordtheresulting
statisticsateach1‐minutelogginginterval.Notethatthe
morefrequentthesamplingrate,thegreatertheimpacton
batterylife.
7. TapDone.
8. TapDoneagaintoexittheLoggingModescreen.
9. TapStartintheConfigurescreentoloadthestatistics
settingsontotheloggerifyouarereadytostart.
Onceloggingbegins,clickthebottombuttonontheloggerto
cyclethroughthecurrentmaximum,minimum,average,and
standarddeviationdataforthecurrentchanneldisplayedon
theLCD.Notethattheloggerwillalwaysdisplaythecurrent
sensorreadingsforsomechannelsinHOBOmobileevenifthey
arenotbeinglogged.Youcanplotthestatisticsseriesonceyou
readoutthelogger.

HOBOMXAnalog/Temp/RH/Light(MX1104)andMX4‐ChannelAnalog(MX1105)Manual
1‐800‐LOGGERS11www.onsetcomp.com
ReadingOuttheLogger
Tooffloaddatafromthelogger:
1. TaptheDevicesiconandthentapLoggersatthetopofthe
screen.Taptheloggertoconnecttoit.Iftheloggerwas
configuredwithBluetoothAlwaysOndisabled,pressa
buttonontheloggertowakeitup.Whenworkingwith
multipleloggers,youcanpressthetopbuttononthelogger
tobringittothetopofthelist.
2. Onceconnected,tapReadout.
3. TaptheDataFilesicontoviewamini‐graphofthe
offloadeddata.
4. Tapthemini‐graphtoviewalargerversionofthegraphor
tosharethefile.
DatacanalsobeuploadedautomaticallytoHOBOlink,Onset’s
web‐basedsoftware,viaHOBOmobileortheHOBOMX
Gateway.FordetailsonuploadingdatatoHOBOlink,seethe
HOBOmobileUser’sGuide.
RecordingInternalLoggerEvents
Theloggerrecordsthefollowinginternaleventstotracklogger
operationandstatus.ToploteventsinHOBOmobile,tapa
mini‐graphandthentap.Selecttheeventsyouwishtoplot
andthentapagain.Youcanalsovieweventsinsharedor
exporteddatafiles.
InternalEventNameDefinition
HostConnectedTheloggerwasconnectedtothemobile
device.
StartedThetopbuttonontheloggerwaspressedto
beginorresumelogging.
StoppedTheloggerreceivedacommandtostop
recordingdata(fromHOBOmobileorby
pushingthetopbuttononthelogger).
Chan<#>Alarm
Tripped
Asensoralarmhastripped;<#>isthesensor
number,1through4.
Chan<#>Alarm
Cleared
Asensoralarmhascleared;<#>isthesensor
number,1through4.Thiseventalso
containsthevaluethatwasfurthestoutof
rangeforthesensorbeforethealarm
cleared,whichisonlyavailableinasharedor
exportedfile.
NewIntervalTheloggerhasenteredorexitedburst
loggingmode.
SafeShutdownThebatteryleveldroppedbelow1.6V;the
loggerperformsasafeshutdown.
MountingtheLogger
Usethefourmagnetsonthebackoftheloggertomountittoa
magneticsurfaceorinsertthetiewrapsthroughthemounting
loopstoattachittoothersurfaces.InsertaSantopreneplug
intoanyemptyanalogsensorportsifnecessary.
ProtectingtheLogger
Theloggerisdesignedforindooruseandcanbepermanently
damagedbycorrosionifitgetswet.Protectitfrom
condensation.
Note:Staticelectricitymaycausetheloggertostoplogging.
Theloggerhasbeentestedto8KV,butavoidelectrostatic
dischargebygroundingyourselftoprotectthelogger.Formore
information,searchfor“staticdischarge”ononsetcomp.com.
BatteryInformation
Theloggerrequirestwouser‐replaceableAAA1.5Valkalineor
optionallithiumbatteriesforoperationattheextremeendsof
theloggeroperatingrange.Batterylifeis1year,typicalwitha
loggingintervalof1minute,butmaybeextendedto2years
whentheloggerisconfiguredwithBluetoothAlwaysOn
disabled.Expectedbatterylifevariesbasedontheambient
temperaturewheretheloggerisdeployed,theloggingor
samplinginterval,frequencyofoffloadingandconnectionto
themobiledevice,numberofchannelsthatareactive,audible
alarmsduration,useofburstmodeorstatisticslogging,and
batteryperformance.Deploymentsinextremelycoldorhot
temperatures,aloggingintervalfasterthan1minute,ora
samplingintervalfasterthan15secondscanimpactbattery
life.Estimatesarenotguaranteedduetouncertaintiesininitial
batteryconditionsandoperatingenvironment.
Toreplacethebatteries:
1. UseaPhillips‐headscrewdrivertounscrewthefourscrews
onthefrontofthelogger.
2. Carefullyseparatethetopandbottomofthelogger
enclosure.
3. Removeanyoldbatteriesandinsertnewbatteries
observingpolarity.
4. Makesuretherubbersealonthebottompartofthelogger
enclosureiscleanandfreeofanydebris.
5. Carefullyreassembletheloggerenclosureandscrewinthe
fourscrews.
WARNING:Donotcutopen,incinerate,heatabove85°C
(185°F),orrechargelithiumbatteries.Thebatteriesmay
explodeiftheloggerisexposedtoextremeheatorconditions
thatcoulddamageordestroythebatterycases.Donotdispose
oftheloggerorbatteriesinfire.Donotexposethecontentsof
thebatteriestowater.Disposeofthebatteriesaccordingto
localregulationsforlithiumbatteries.
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HOBOMXAnalog/Temp/RH/Light(MX1104)andMX4‐ChannelAnalog(MX1105)Manual
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1‐800‐LOGGERS(564‐4377)•508‐759‐9500
www.onsetcomp.com/support/contact
©2019OnsetComputerCorporation.Allrightsreserved.Onset,HOBO,HOBOmobile,andHOBOlinkare
registeredtrademarksofOnsetComputerCorporation.AppleisaregisteredtrademarkandAppStoreisa
servicemarkofAppleInc.BluetoothandBluetoothSmartareregisteredtrademarksofBluetoothSIG,Inc.All
othertrademarksarethepropertyoftheirrespectivecompanies.
Patent#:8,860,56923968‐B
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FederalCommunicationCommissionInterferenceStatement
ThisequipmenthasbeentestedandfoundtocomplywiththelimitsforaClassBdigitaldevice,pursuanttoPart15oftheFCCRules.Theselimitsaredesignedtoprovide
reasonableprotectionagainstharmfulinterferenceinaresidentialinstallation.Thisequipmentgeneratesusesandcanradiateradiofrequencyenergyand,ifnotinstalledand
usedinaccordancewiththeinstructions,maycauseharmfulinterferencetoradiocommunications.However,thereisnoguaranteethatinterferencewillnotoccurina
particularinstallation.Ifthisequipmentdoescauseharmfulinterferencetoradioortelevisionreception,whichcanbedeterminedbyturningtheequipmentoffandon,theuser
isencouragedtotrytocorrecttheinterferencebyoneofthefollowingmeasures:
Reorientorrelocatethereceivingantenna
Increasetheseparationbetweentheequipmentandreceiver
Connecttheequipmentintoanoutletonacircuitdifferentfromthattowhichthereceiverisconnected
Consultthedealeroranexperiencedradio/TVtechnicianforhelp
ThisdevicecomplieswithPart15oftheFCCRules.Operationissubjecttothefollowingtwoconditions:(1)Thisdevicemaynotcauseharmfulinterference,and(2)thisdevice
mustacceptanyinterferencereceived,includinginterferencethatmaycauseundesiredoperation.
FCCCaution:Anychangesormodificationsnotexpresslyapprovedbythepartyresponsibleforcompliancecouldvoidtheuser'sauthoritytooperatethisequipment.
IndustryCanadaStatements
ThisdevicecomplieswithIndustryCanadalicense‐exemptRSSstandard(s).Operationissubjecttothefollowingtwoconditions:(1)thisdevicemaynotcauseinterference,and
(2)thisdevicemustacceptanyinterference,includinginterferencethatmaycauseundesiredoperationofthedevice.
Avisdeconformitépourl’IndustrieCanada
LeprésentappareilestconformeauxCNRd'IndustrieCanadaapplicablesauxappareilsradioexemptsdelicence.L'exploitationestautoriséeauxdeuxconditionssuivantes:(1)
l'appareilnedoitpasproduiredebrouillage,et(2)l'appareildoitacceptertoutbrouillageradioélectriquesubi,mêmesilebrouillageestsusceptibled'encompromettrele
fonctionnement.
TocomplywithFCCandIndustryCanadaRFradiationexposurelimitsforgeneralpopulation,theloggermustbeinstalledtoprovideaseparationdistanceofatleast20cmfrom
allpersonsandmustnotbeco‐locatedoroperatinginconjunctionwithanyotherantennaortransmitter.