Hobo U14 Manual de usuario

©2010–2012OnsetComputerCorporation.Allrightsreserved.Onset,HOBO,andHOBOwarearetrademarksorregisteredtrademarksofOnsetComputerCorporationforitsdatalogger

productsandconfiguration/interfacesoftware.Allothertrademarksarethepropertyoftheirrespectivecompanies.

13416‐CMAN‐U14‐00x

U14DataLogger

(ModelU14‐001shown)

HOBO®U14 Data Logger User Manual

TheUfamilyofdataloggersoffersreliabilityandconvenientmonitoringforapplicationsthat

requirehigheraccuracy,betterresolution,morememory,orUSBconnectivityforfastdata

readouttoyourcomputer.

TheHOBOU14loggerrecordsanddisplaystemperatureandhumidityconditionsin

manufacturing,processing,andstorageenvironmentswherereliablemonitoringand

documentationofspecifictemp/RHconditionsarecritical.

TheHOBOU14isavailableintwoversions:U14‐001withinternalsensorsandtheU14‐002

withexternalsensors.TheHOBOU14requiresHOBOware®ProorHOBOwareLite,Version2.5

orlater.

Features

64knon‐volatilememorythatretainsdataevenifthebatteriesfail

MemoryindicatoronLCDshowshowmuchdatastoragespaceremains

BatteryLevelindicatorshowsremainingusefulbatterylife

OperatesforoneyearonthreealkalineAAAbatteriesintypicalconditions

Built‐inrelayforusewithRemoteAlarmorAutomaticDialer

DirectUSBinterfaceforlaunchinganddatareadoutusingHOBOware

Sample(logging)intervalcanbesetfromonesecondto18hours

SupportsOnset’sDataAssistants(availablewithHOBOwaresoftware)

CanbeusedwiththeOnsetU‐Shuttle(U‐DT‐1)

Internalsensormodel(U14‐001)hasinternaltemperatureandrelativehumiditysensorswith12‐bitresolution

Externalsensormodel(U14‐002)supportsthe12‐bitTemperature/10‐bitRHSensor(S‐THB‐M00x)andthe12‐bit

TemperatureSensor(S‐TMB‐M00x)

Accessories

OutdoorCase(CASE‐4x)

RemoteAlarm(ARA)

AutomaticDialer(AVD‐45)

LocationRequirements

TheHOBOU14isdesignedforanon‐condensing,non‐corrosiveenvironment.Keeptheloggerdry.Someexternalsensorscanbe

placedinharsherenvironmentsthanthelogger.Seetheexternalsensorspecificationsinthesensorusermanual.

Specifications

Environmental

Operatingtemperaturerange‐20°Cto+50°C,(‐4°Fto+122°F),0to100%RHnon‐condensing

Operatingrelativehumidityrange0to95%,non‐condensing,non‐corrosiveenvironment

LoggerCapabilities

CapacityTempandRH:21,500measurements;TempOnly:43,000measurements

Software‐selectablesamplingintervals1secondupto18hours,recordingtimesupto1year

StartProgrammablestarttime/date

RecordingmodesStopwhenfull

LaunchModesImmediate,Delayed

MemoryNonvolatileEEPROMmemoryretainsdataevenifbatteriesfail

HOBO U14 Data Logger User Manual

2

PlotA:InternalTemperatureSensor

AccuracyandResolution

Specifications

LCD

Size33x50.8mm(1.3x2inches)

ElementsTemperatureandrelativehumiditysimultaneously

°Cor°F(selectablewithinhostsoftware)

Memoryremainingandbatterylevel

FlashingALERTforout‐of‐limitsconditions(selectablewithinhostsoftware),whichstopsflashing

onoffloadorreturntonormalrange

Alarms

SetpointsHighandlowsetpointsforbothtemperatureandrelativehumiditywithselectabledelays

ResetoptionsAlertconditionsresetonoffloadorreturntonormalrange

SelectableContactRelayNormallyClosedorNormallyOpen

Contactrating48VDC,1Amax

ContactresistanceLessthan1Ohm

Range0%LowBatteryRange

Communications

MethodOffloadsdatatoPCorU‐ShuttleviaUSBcable

SpeedReadoutfulllogger(64K)inlessthan30seconds

Timeaccuracy±1minutepermonthat+20°C(+68°F)

Power3AAAAlkalinebatteries,user‐replaceable

Dimensions125x92x31mm(4.9x3.6x1.2in)

Weight170g(6.0oz)withbatteries

Internal12‐BitTemperatureSensor

Measurementrange‐20°Cto+50°C(‐4°Fto+122°F)

Accuracy±0.21°Cfrom0°to50°C(±0.38°Ffrom32°to122°F);±0.13°C(0.24°F)typical(seePlotA)

Resolution0.02°C@25°C(0.04°F@77°F)(seePlotA)

Responsetime15minutes(to90%inairflowof1m/sec)

TemperatureAccuracyDriftNegligible

Internal12‐BitRelativeHumiditySensor(Userreplaceable)

Measurementrange0‐100%RH,‐20to50°C(‐4to122°F)

Accuracy+/‐2.5%from10%to90%RH(typical),toamaximumof+/‐3.5%includinghysteresis(seePlotB)

Resolution0.03%RH@25°C(77°F)

Responsetime2minutes(to90%inairflowof1m/sec)

AccuracyDrift<2%over5yearstypical

Hysteresis1%Typical

ExternalSensorsForExternalSensorSpecifications,seethesensor’susermanual

BatteryLifeThebatterieswilllastoneyearintypicalconditions(loggingintervalsof≥1minutewithweekly

offloadsandaveragetemperaturesgreaterthan10°Cor+50°F).Frequentoffloadsand/orextreme

temperatureswillreducebatterylife.Attemperaturesbelowfreezing(0°Cor+32°F),batterieswill

typicallyrequirereplacementeverysixmonths.Intheseconditionsthebatterylevelbargraph

shouldbecheckedregularly.SeeBatteryLevelIndicatorsonpage8.



TheCEMarkingidentifiesthisproductascomplyingwithallrelevantdirectivesintheEuropean

Union(EU).

TemperatureAccuracyandResolution

Themaximumreadingerrorfortheinternaltemperaturesensorsisshownatright.Thisisaworstcase

error.Inatypicallogger,temperatureerrorswillbesubstantiallylower.NISTcertificationof

temperatureaccuracyforsomesensorsisavailablefromOnset.Thetemperatureresolutionforinternal

sensorsisalsoshownatright.Resolutionisthesmallestdifferencebetweenadjacenttemperaturesteps

thattheloggercanreport.Theloggerwilltypicallyexperiencelittleornoaccuracydriftunlessthe

electroniccomponentsortemperaturesensoraredamagedmechanicallyorbyexposureto

environmentalfactorsbeyondthespecifications,suchashighheatandhumidity.

HOBO U14 Data Logger User Manual

3

Plot B:InternalRHSensorAccuracy

Internal Relative Humidity Accuracy

Temperaturecompensated.

DonotexposetheinternalRHsensortofog,mist,orothercondensing

conditions.

Thelogger’srelativehumidityaccuracyfortheinternalmodelisshowninthe

plotatright.

Components

FrontBack



CircuitBoard



LCDScreen.

SeeTheLCD

Screensection

fordetails.

USBPort.

UseanOnset‐

suppliedUSB

interfacecable

toconnectthe

HOBOU14toa

computer.

ExternalSensor

Port(Model

U14‐002Only).

Connect

supported

SmartSensor

here.

ReplaceableInternalRHSensor(ModelU14‐001Only).Theinternal

relativehumiditysensorintheU14‐001mayrequirereplacementif

itisdamagedmechanicallyorbyexposuretocondensationor

chemicals.Thereplacementsensor(partnumberHUM‐RHPCB‐3or

RHPCB‐3A)isavailablefromOnsetoranOnsetAuthorizedDealer.

Seethelastpageformoredetails.

RelayTerminal(forRemoteAlarmorAutomaticDialer).TheHOBO

U14iscompatiblewithOnset’sRemoteAlarm(partnumberARA)and

AutomaticDialer(partnumberAVD‐45)availablefromOnset

ComputeroranOnsetAuthorizedDealer.Seethenextsectionfor

moredetails.

MountingHoles.Use

mountingscrews2.5cm

(1inch)aparttomount

theU14toawall.

BatteryCompartment.TheHOBOU14requires

threeAAAbatteries.OnsetComputerCorporation

stronglyrecommendstheuseoffreshalkaline

batteries.Batteriesshouldbereplacedwhenthe

BATTLEVELbargraphisdowntoonesegment,

whichindicates20%batterylifeorless.

HOBO U14 Data Logger User Manual

4

SettingUptheHOBOU14

FollowtheseinstructionsforsettingupandlaunchingtheHOBOU14logger.

1. InsertthethreeAAAbatteries.Removethebatterydooronthebackoftheunitandinsertthebatteriesintheproper

direction.

2. IfyouareusingaRemoteAlarmand/orAutomaticDialer,connectittotheHOBOU14now.Otherwise,replacethe

batterycoverandgotostep3.

TheHOBOU14iscompatiblewithOnset’sRemoteAlarm(partnumberARA)andAutomaticDialer(partnumberAVD‐

45)availablefromOnsetComputeroranOnsetAuthorizedDealer.Seetheproduct’susermanualforcompletedetails.

Theinterconnectwirerangeis22AWGto14AWG.ToconnectaRemoteAlarmorAutomaticDialertotheHOBOU14:

a. Loosenthetwoscrewsontherelay

terminal.(Removethebatterydoorif

necessary.)

b. Feedthewiresthroughthesmallholeat

thebottomofthecase.

c. Feedthewiresthroughtheholesinthe

relayterminal.

d. Tightenthescrewsontheterminal.

e. Replacethebatterycompartmentcover.

f. ConnectthewirestotheRemoteAlarmorAutomaticDialerusingthefollowingwiringdiagramsasguides.

AllthreedrawingsshowtheloggerintheNormallyClosedstatewiththeAlertinactive.TheHOBOU14’scontact

closureisinitiallysetatthefactorytobeNormallyClosed,butyoucanchangethisinHOBOwaretoaccommodate

NormallyOpendevices(seetheARAUser’sManual).

IfthealertoutputisconnectedtoaremotealarmconfiguredforNormallyClosedinputs,youcanavoidfalsealarms

whentheloggerisdisconnectedbymakingatemporaryconnectionbetweenthewiresgoingtotheremotealarm.

Besuretodisconnectthistemporaryconnectionwhentheloggerisreconnectedtotheremotealarmwires.

HOBOU14withOnset’sARARemoteAlarm

NOTE:Thepolarityoftheconnectionstotheloggerdoesnotmatter.



HOBOU14withOnset’sAVD‐45AutomaticDialer

NOTE:Thepolarityoftheconnectionstotheloggerdoesnotmatter.

HOBO U14 Data Logger User Manual

5

HOBOU14withOnset’sARARemoteAlarmandAVD‐45AutomaticDialer

NOTE:Thepolaritymustbeasshown.

3. IfyouhaveanExternalSensormodel(U14‐002):PlugtheexternalsensorintotheRJ‐12jackonthesideoftheHOBO

U14.Holdtheblackrubberflapdownagainsttheconnectorsoitslidesintotheport.NOTE:Thesensorreadingswillnot

bedisplayeduntiltheloggerislaunched(immediateordelayed)orthestatusischeckedusingeitherHOBOwareorthe

U‐Shuttle.Thereadingswillnotbeloggeduntilyoulaunchtheloggerlaterinthisprocedure.

4. ConnecttheU14toacomputerrunningHOBOware.PlugthelargeendoftheUSBcablesuppliedwithHOBOwareinto

aUSBportonthecomputerandplugthesmallendofthecableintothesideoftheHOBOU14.Iftheloggerhasnever

beenconnectedtothecomputerbefore,itmaytakeafewsecondsforthenewhardwaretobedetected(Windowsonly).

5. StartHOBOwareandopentheLaunchwindow.FromtheDevicemenu,selectLaunch.ConfigureLaunchparameters,

includingaLaunchdescription,logginginterval,andstarttime.ClickHelpinHOBOwarefordetailsonLaunch

parameters.

6. ConfigureAlarms(optional).UsetheAlarmfeaturetoflashawarningontheLCDifthemonitoredtemperatureor

relativehumidityfallsoutsideuser‐selectablelimits.IfthetemperatureorRHmeasuredbytheloggerfallsoutsidethe

selectedhighorlowlimit,theword‘Alert,’analertsymbol,andthetemperatureorRHmeasurementthatwentoutof

limitswillflash.

7. Ifyourequireremoteorsecondarynotificationofanalarmcondition,youcanconnectaremoteaudioalarmand/oran

AutomaticDialertothecontactclosureasdescribedinStep2.

ToaccesstheAlarmfeature,clicktheAlarmsbuttonintheLaunchwindow,whichopensthefollowingdialogbox.



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a. EnableSensorAlarms.Toenableasensoralarm,selectthedesiredsensorintheChannelbox,andthenselectthe

checkboxfortheHighAlarmand/ortheLowAlarm.Enteravaluetodefinethealarmthreshold.Youcanentera

valueintheboxorusethesliders.(Ifyouentervaluesmanually,thesoftwaremayadjustthemslightlytothe

nearestvaluessupportedbythelogger.)Youcanalsosetthenumberofsamples(30secondspersample)thatmust

bedisplayedbeforethealarmwillbetriggered.

b. SetNumberofSamples.Toavoidunintendedactivationoftherelaycontact,setthenumberofsamplestoallow

foranticipatedbreachesofthealarmthreshold.Ifthealarmistrippedandthenumberofsamplesissettomore

than1,theLCDwillindicateAlertDelayed.Ifthemeasurementisstilloutofrangewhenthenumberofsamplesis

reached,therelaycontactwillbeactivated.

NoteaboutAvoidingUnintendedRelayActivation.Insomeapplications,theenvironmentinwhichthelogger

islaunchedisinimmediateviolationofthedesiredalarmlimitandwillcauseanunintendedopeningorclosing

ofthecontactrelay.Forexample,settinganupperalarmlimitof+32°Fforafreezerapplicationandthen

launchingtheloggerinaroomatroomtemperaturewillcauseanimmediatealarmtrigger.Inthissituation,

enableaDelayedLaunchorselectanumberofsamplesthatwillresultinalongenoughdelaytoallowtimeto

transport,mount,andstabilizetheloggerinthedesiredlocation.

Othercausesofinvalidalarmswouldbefreezerdoorsbeingopenedfrequentlyordefrostcycles.Toavoid

these,setthenumberofsamplestoallowforsmallperiodsoftimewherethevalueisoutsidetherange,but

wherethealarmwillnotbetrippedunlessthevalueisoutsidetherangeforasignificantnumberofsamples.

c. LowBatteryAlarm.SelecttheBatteryAlarmcheckboxtoenabletheBatteryAlarm,whichwilltriggerifthebattery

dropsto0%.

d. AlarmReset.SelectwhetherthealarmwillbedeactivatedwhentheHosthasrelaunchedtheloggerorwhenthe

sensorreadinghasreturnedwithinlimits.

e. SetRelayContact.Ifyouareusinganexternaldevicethatwillbetriggeredbyanalarm(suchasaRemoteAlarmor

AutomaticDialer),setthedesireddefaultrelaycontactstatetoeitherNormallyClosed(relayopensduringanalarm

condition,whichisthedefault)orNormallyOpen(relayclosesduringanalarmcondition)TheARARemoteAlarm

canbesettoNormallyClosedorNormallyOpen(seeremotedeviceUser’sManualsformoredetails).NOTE:The

AVD‐45AutomaticDialerrequiresthelogger’scontactstobesettoNormallyClosed.

f. TesttheRelayAlarm.UsetheTestSetAlarmbuttontotesttherelayalarmfunction.WhenyouclicktheTestSet

Alarmbutton,theloggerwillactivatethealarmandchangetheconditionofthecontactclosure.Whenyouclick

theTestSetAlarmbutton,itchangestotheTestClearAlarmbutton.ClicktheTestClearAlarmbuttonto

deactivatethealarm.

NOTE:WhentestingthealarmwiththeAVD‐45AutomaticDialer,Onsetrecommendsthatyoumaintainthealarm

forupto7minutestoensurethattheAVD‐45AutomaticDialercompletesitsdial‐outsequence(seeAVD‐45

AutomaticDialerUser’sManualfordetails).

8. ClicktheLaunchbuttoninHOBOwaretolaunchtheHOBOU14.NOTE:IfyouremovetheexternalsensorontheU14‐

002modelafterloggingstarts,youwillneedtorelaunchtheloggerifyoureconnectasensor.

9. DisconnecttheHOBOU14fromthecomputerbyunpluggingtheUSBcable.

10. Transporttheloggertodeploymentsite.

11. Mountthelogger.TheHOBOU14isdesignedforanon‐condensing,non‐corrosiveenvironment.Makesurethelogger

isinstalledinalocationwhereitwillremaindry.Someoftheexternalsensorscanbeplacedinharsherenvironments

(seethesensormanualforspecifications).

a. Markthewallfortheplacementofthetwomountingscrews2.5cm(1inch)apart(vertically).

b. Screwinmountingscrews,leavingagapbetweenthewallandtheheadofthescrewofabout0.5cm(3/16in.).

c. Attachloggerbyaligningitwiththescrews,andthenpushinanddowntolockinplace.

12. IfyouhaveanExternalSensormodel(U14‐002),mounttheExternalSensors(seethesensorusermanual).

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Insomeapplications(suchasarefrigerator,freezer,cleanroom)itmaybemoreconvenienttopermanentlymountan

externalsensoratthesite.Besuretoplacetheremotesensorinalocationthatisrepresentativeofthetarget

measurementlocationandallowsfreeflowofair(bewareofanydraftscausedbyvents,doors,etc).

Ifyoupermanentlymountthesensorandlaterhavetodisconnectitfromtheloggerforreadout,selectDelayedLaunch

whenyourelaunchtheloggertoallowtimetoreconnectthesensorbeforetheactuallaunchtime.

13. ReadouttheHOBOU14asdescribedinthenextsection.Whenthememoryisfull,oranytimeyouwanttoviewthe

data,readouttheHOBOU14usingHOBOware.

ReadingOuttheHOBOU14

NOTE:IfyouareusingtheU‐Shuttletoreadoutthelogger,seetheU‐ShuttleUserManualforspecificinstructions.

TooffloaddatafromtheHOBOU14:

1. Optional:Disconnecttheloggerfromtheexternalsensor,RemoteAlarmorAutomaticDialer.

2. Transporttheloggertothelocationofthecomputer.

3. Connecttheloggertothecomputer.

4. OpenHOBOwaresoftwareonthecomputer.

5. Optional:Ifyouhavemorethanoneloggerconnectedtothecomputer,connecttotheHOBOU14byselectingDevice>

SelectandthenselecttheHOBOU14fromtheSelectDevicewindow.

6. Fromthemainmenu,clicktheReadouticon(orselectDevice>Readoutfromthemainmenu).

7. Iftheloggeriscurrentlylogging,youcanchoosetocontinueloggingwhileoffloadingorstoplogging.Thereadoutwill

begin.ThestatusbarintheReadoutLoggerwindowwillindicatethepercentagecomplete.

8. Whenprompted,enteranameforthefileandclickSave.ThePlotSetupDialogappears.

9. ClickPlottoviewthegraphofthedata.SeetheHOBOwareUserManualorOn‐lineHelpformoredetailsongraphing,

timeselectioninplots,andexportingdatafiles.

10. Toredeploythelogger,re‐launchitwithadelayedstartallowingenoughtimetoreturntheloggertothesite,reconnect

externaldevicesifany(ExternalSensors,RemoteAlarm,AutomaticDialer).

TheLCDScreen

Afterinstallingthebatteries,theLCDwilldisplayallsegmentsforfiveseconds.Thereafter,theLCDwilldisplaytemperatureand

%RHinformation.ThevaluesontheLCDscreenrefreshevery30seconds.ThefollowingisanoverviewoftheLCDscreen

elements.Formoredetailsonindividualelements,seeLCDIndicatorsformoredetails.



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TemperatureReading.Thisdisplaysthecurrenttemperature(FahrenheitorCelsiusasselectedinHOBOware)onthe

LCD.Internalsensorhastemperaturemeasurementrangeof‐20°Cto+50°C(‐4°Fto+122°F).Notes:Theremaybeslight

variationsbetweenthedisplayedtemperaturevalueandtheloggedvalueduetolimitsindisplayconversions.The

valuesseeninHOBOwareandtheU‐Shuttlearetheactualrecordedvaluesandthemostaccurate.Thedisplayed

temperatureontheLCDscreenmaybe±0.3°C(±0.6°F)differentthantheloggedvalue.Fahrenheitvaluesof200°and

higheraredisplayedasthreedigitswithoutadecimal(e.g.,205°F);however,thefullresolutionvaluewillberecordedin

theloggermemory(e.g.,205.4).

RelativeHumidity(RH)Reading.ThisdisplaysthecurrentRHontheLCD.Theinternalsensorhasameasurementrange

of0%to100%.

AlarmIcon.ThisdisplaysalertsasconfiguredwithinHOBOware.Specifically,ALERTindicatorsignalswhentemperature

orrelativehumiditylimitshavebeenexceeded.ALERTDELAYEDifyouhavedelayenabledandanalarmistripped.

Trianglewithexclamationmarkimmediatelyafterdelay(ifenabled)indicatesthattherelayisinanalarmstate.

BatteryLevel.Remainingbatterylevelisindicatedbyafive‐segmentbar.Thenumberofsegmentsdecreasesasbattery

leveldecreases.BatteriesshouldbereplacedwhentheBATTLEVELbargraphisdowntoonesegment,whichindicates

20%batterylifeorless.

RemainingMemory.Remainingmemoryisindicatedbyafive‐segmentbar.Thenumberofsegmentsdecreasesas

remainingmemorydecreases.NOTE:Ifthememoryisfull,theloggerwillnolongerlog.Theloggerwillcontinueto

monitorconditionshowever,andwilltriggeranalertifthereadingfallsoutsideoftheconfiguredrange.Youmust

readouttheloggerandthenrelaunchitusingHOBOwaretoresumelogging.

LCD Indicators

Alarms IfthetemperatureorRHmeasuredbytheloggerfallsoutsidetheselectedhighorlow

limit,theword‘Alert,’analertsymbol,andthetemperatureorRHmeasurementthat

wentoutoflimitswillflash.Ifyousetthenumberofsamplestogreaterthan1andthe

measuredvalueisoutsidethelimits,ALERTDELAYEDwillflashuntileitherthenumber

ofsamplesisreached(ALERTwithatrianglesymbolisdisplayed)orthealertcondition

nolongerexists.

Battery Level

BATTLEVELbargraphdowntoonesegmentindicates20%batterylifeorless.Batteries

shouldbereplaced.

Condensation (100%RH) 100%RHisdisplayedifatemperature/RHsensorisconnectedandiscoveredwith

condensation.Thesensorwillnotprovideaccuratereadingsuntilithasdriedout.

Unread Data Iftheloggerhasbeenstopped,eithermanuallyorbecausethememoryisfull,theMEM

LEFThashmarkswillblinkindicatingthereisunreaddata.

Memory

Remainingmemoryisindicatedbyafive‐segmentbar.Segmentsdecreaseasremaining

memorydecreases.TheMEMLEFTbargraphwilldecreaseasthememoryisfilled.

Whenthememoryhasbeencompletelyfilled,theMEMLEFTdisplaywillflashandall

segmentswillbeoff.TheHOBOU14willcontinuetomonitorconditionshowever,and

willtriggeranalertifthereadingfallsoutsideoftheconfiguredrange.Youmust

readouttheloggerandthenrelaunchitusingHOBOwaretoresumelogging.



HOBO U14 Data Logger User Manual

9

LCD Indicators

MemoryDisplayStates

StateMEMLEFTHash

marks

SegmentsIllustration

StoppedOnNone



Launched/

Logging

OnNumberofsegmentsdepends

onmemoryremaining.Highest

segmentflashes.



Launch

Delaying

FlashingAllOn/Flashing



MemoryFullFlashing

(untildatais

downloaded)

AllOff



ExternalSensorRemoved Ifanexternalsensorisdisconnectedfromthelogger,theloggerwillrecordvaluesof‐

888.88°C/‐888.88°Ffortemperatureand0%RH.

NoExternalSensor

IftheU14‐002loggerislaunchedandnoexternalsensorhasbeenconnected,the

displaywillshowdashes“‐‐‐”andwilllogfalsevalues(‐888.88°C/‐888.88°Ffor

temperatureand‐888.9%forRH).

TempOnlySensorInstalled

Ifatemperature‐onlysensorisconnected,noRHvaluewillbedisplayed.

NoRHSensorInstalledbutChannel

Active



Adisplayof‐‐%RHindicatesthatthehumiditychannelisactiveinthesoftwareand

shouldbeturnedofftomaximizememoryspace.Otherwise,theunitwillrecorda‐

888.9%RHvalueateverylogginginterval

HOBO U14 Data Logger User Manual

10

Maintenance

ReplacingBatteries

TheHOBOU14requiresthreeAAAbatteries.OnsetComputerCorporationstronglyrecommendstheuseoffreshalkaline

batteries.BatteriesshouldbereplacedwhentheBATTLEVELbargraphisdowntoonesegment,whichindicates20%batterylife

orless.Toensuredataintegrity,useHOBOwaretoreadouttheloggerandstoploggingbeforechangingbatteries.

ReplacingtheInternalRHSensor(ModelU14‐001Only)

TheinternalrelativehumiditysensorintheU14‐001loggermayrequirereplacementifitisdamagedmechanicallyorby

exposuretocondensationorchemicals.Thereplacementsensor(PartNo.HUM‐RHPCB‐3A)isavailablefromOnsetoranOnset

AuthorizedDealerforU14‐001loggerswithserialnumbersabove9847173.Note:U14‐001loggerswithaserialnumberbelow

9847173requireadifferentreplacementsensor(PartNo.HUM‐RHPCB‐3).YoucanreplacetheinternalRHsensoryourselfor

haveitreplacedaspartofaU14‐001tune‐up/calibrationservice(availablefromOnset).ContactOnsetformoredetails.



OnsetComputerCorporation

www.onsetcomp.com

MailingAddress:

P.O.Box3450

Pocasset,MA02559‐3450

Phone:1‐800‐LOGGERS(1‐800‐564‐4377)or508‐759‐9500

Fax:508‐759‐9100

HoursofOperation:8AMto5PMET,MondaythroughFriday

Email:[email protected]

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