Hobo UX100-023A User manual

HOBO®ExternalTemp/RHDataLogger(UX100‐023A)Manual
22934‐B
TheHOBOExternalTemp/RHdataloggerrecordstemperatureandrelativehumidityinanindoor
environmentwithitsexternalsensor.UsingHOBOware®,youcaneasilyconfigurethelogger
alarmtotripforspecifichighorlowsensorreadings.Or,youcansetupburstlogginginwhichthe
loggerrecordsdataatadifferentintervalduringcertainconditions.Theloggercanalsocalculate
minimum,maximum,average,andstandarddeviationstatistics.Thiscompactdataloggerhasa
built‐inLCDscreentomonitorthecurrenttemperature,relativehumidity,loggingstatus,battery
use,andmemoryconsumptioninbetweenreadouts.
Specifications
TemperatureSensor
Range‐20°to70°C(‐4°to158°F)
Accuracy±0.21°Cfrom0°to50°C(±0.38°Ffrom32°to122°F)
Resolution0.02°C(0.04°F)
ResponseTime3minutes,45secondsinairmoving1m/s(2.2mph)
Drift<0.1°C(0.18°F)peryear
RHSensor
Range1%to100%RHat‐40°to75°C(‐40°to167°F),non‐condensing;
exposuretoconditionsbelow‐20°C(‐4°F)orabove95%RHmay
temporarilyincreasethemaximumRHsensorerrorbyanadditional
1%
Accuracy±2.5%from10%to90%RHtypicaltoamaximumof±3.5%including
hysteresisat25°C(77°F);below10%andabove90%±5%typical
Resolution0.01%
ResponseTime15secondsto90%inairflowof1m/s(2.2mph)
Drift<1%peryeartypical
CableLength1.83m(6ft)
Logger
LoggerOperatingRangeLogging:‐20°to70°C(‐4°to158°F);0to95%RH(non‐condensing)
Launch/Readout:0°to50°C(32°to122°F)perUSBspecification
LoggingRate1secondto18hours,12minutes,15seconds
LoggingModesFixedinterval(normal),burst,orstatistics
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,ordate&time
RestartModePushbutton
TimeAccuracy±1minutepermonthat25°C(77°F),seePlotA
PowerSourceOne3VCR2032lithiumbatteryandUSBcable
BatteryLife1year,typicalwithloggingrateof1minuteandsamplingintervalof
15secondsorgreater
Memory128KB(63,488measurements,maximum)
DownloadTypeUSB2.0interface
FullMemoryDownloadTime20seconds
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3.66x8.48x1.52cm(1.44x3.34x0.6in.)
Weight30g(1.06oz)
EnvironmentalRatingIP50

TheCEMarkingidentifiesthisproductascomplyingwithallrelevant
directivesintheEuropeanUnion(EU).
HOBOExternal
Temp/RHDataLogger
UX100‐023A
IncludedItems:
Command™strip
Double‐sidedtape
Hook&loopstrap
RequiredItems:
HOBOware3.7.16orlater
(downloadat
www.onsetcomp.com/
hoboware‐free‐download)
USBcable



HOBOExternalTemp/RHDataLogger(UX100‐023A)Manual
1‐800‐LOGGERS2www.onsetcomp.com
Specifications  (continued)

PlotA:TimeAccuracy 
LoggerComponentsandOperation

Start/Stop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
HOBOwarewithapushbuttonstartorstop,andwith“Resume
loggingonnextbuttonpush”selected(seeSettingupthe
Logger).Youcanalsopressthisbuttonfor1secondtorecord
aninternalevent(seeRecordingInternalLoggerEvents)orto
turntheLCDscreenoniftheoptiontoturnofftheLCDhas
beenenabled(seeSettinguptheLogger).
BatteryTray:Removethebatterytrayonthetopofthelogger
toaccesstheloggerbattery(seeBatteryInformation).
Alarm/StatsButton:Usethisbuttontoclearatrippedalarm
(seeSettingupAlarms)ortoswitchbetweenstatistics,alarm
readings,andthecurrentsensorreadings.
MountingLoops:Usethetwomountingloopstomountthe
loggerwiththehook‐and‐loopstrap(seeMountingtheLogger).
ExternalTemp/RHSensor:TheexternaltemperatureandRH
sensorsareattheendofthesensorcable,whichisattachedto
logger.
USBPort:Usethisporttoconnecttheloggertothecomputer
ortheHOBOU‐ShuttleviaUSBcable(seeSettinguptheLogger
andReadingOut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inthetablebelow.

LCDSymbolDescription

Theloggeriswaitingtobelaunched.Pressand
holdtheStart/Stopbuttonfor3secondstolaunch
thelogger.

Theloggerhasbeenlaunchedwithapushbutton
stopenabled;pressandholdtheStart/Stop
buttonfor3secondstostopthelogger.Note:If
youalsolaunchedtheloggerwithapushbutton
start,thissymbolwillnotappearonthedisplayfor
30seconds.

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launched,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.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.Thiswillcontinueuntil
theloggerisstoppedorthebatteryrunsout.
Theloggeriscurrentlylogging.

Asensorreadingisaboveorbelowthehighorlow
alarmthatyouconfigured.Pressandreleasethe
Alarm/Statsbuttonuntilthe“alm”symbol
(describedbelow)isdisplayedonthescreen.This
symbolatleftwillcleardependingonhowalarms
wereconfiguredinHOBOware.Ifthealarmwas
configuredtoclearwhentheloggerisrelaunched,
thissymbolwillremainontheLCD.Otherwise,it
willclearwhenthesensorreadingisbackwithin
thealarmlimitsorbypressingtheAlarm/Stats
buttonfor3seconds.

Analarmisreadytobecleared.Thiswillonly
appearif“Clearedwithbuttonpress”wasselected
intheHOBOwarealarmsettings.Pressthe
Alarm/Statsbuttonfor3secondstoclearthe
alarm.




Thesesymbolsshowthemaximum,minimum,
average,andstandarddeviationvaluesmost
recentlycalculatedforthelogger(ifthelogging
modehasbeensettoStatisticsinHOBOware).
PresstheAlarm/Statsbuttonfor1secondtocycle
througheachoftheavailablestatisticsandthen
backtothecurrentsensorreading(ortothealarm
valueifapplicable).

Thisisthesensorreadingthattrippedthealarm.
PresstheAlarm/Statsbuttontoviewthisreading.
PresstheAlarm/Statsbuttonagaintocycle
throughanystatistics(definedabove)and
ultimatelybacktothecurrentsensorreading.
Alarm/StatsButton
Start/StopButton
USBPort
Mounting
Loop
BatteryTray
Mounting
Loop
LCDScreen
ExternalTemp/RHSensorCable

HOBOExternalTemp/RHDataLogger(UX100‐023A)Manual
1‐800‐LOGGERS3www.onsetcomp.com
LCDSymbolDescription

Thisisanexampleofatemperaturereading.
Temperatureunitsaredeterminedbythesettings
inHOBOware.ToswitchbetweenCelsiusand
Fahrenheit,changetheDisplayPreferencesin
HOBOwarebeforelaunchingthelogger.

ThisisanexampleofanRHreading.

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launchsettingsarebeingloadedontothe
loggerfromHOBOware.Donotdisconnectthe
USBcableduringthisprocess.

Anerroroccurredwhileloadingthelaunch
configurationsontotheloggerfromHOBOware.
MakesuretheUSBcableisconnectedtoboththe
loggerandthecomputerandtrylaunchingagain.

TheloggerhasbeenstoppedwithHOBOwareor
becausethememoryisfull.
Notes:
YoucandisabletheLCDscreenwhenlogging.Select
“TurnLCDoff”whensettinguptheloggerasdescribedin
thenextsection.Whenthisoptionisenabled,youcan
stilltemporarilyviewtheLCDscreenbypushingthe
Start/Stopbuttonfor1second.TheLCDwillthenremain
onfor10minutes.
TheLCDscreenrefreshesevery15secondsregardlessof
theloggingintervalselectedinHOBOware.Ifyouchoose
aloggingintervallessthan15seconds,thedatawillbe
recordedatthefasterinterval,butthesensorreadings
willonlybeupdatedonthescreenevery15seconds.
Whentheloggerhasstoppedlogging,theLCDscreenwill
remainonuntiltheloggerisoffloadedtoacomputeror
HOBOU‐Shuttle(unlesslaunchedwiththe“TurnLCDoff”
option).Oncetheloggerhasbeenoffloadedand
disconnectedfromthecomputer,theLCDwillturnoff
automaticallyafter2hours.TheLCDwillturnbackonthe
nexttimetheloggerisconnectedtothecomputer.
SettinguptheLogger
UseHOBOwaretosetupthelogger,includingsettingalarms,
selectingtheoptionstostartandstoplogging,andchoosinga
loggingmode.
1. ConnecttheloggerandopentheLaunchLoggerwindow.
Toconnecttheloggertoacomputer,usetheUSBcable
provided.ClicktheLaunchiconontheHOBOwaretoolbar
orselectLaunchfromtheDevicemenu.
Important:USB2.0specificationsdonotguarantee
operationoutsidetherangeof0°C(32°F)to50°C(122°F).
2. Selectthesensorstologinthisdeployment.Choose
TemperatureorTemperatureandRH.Typealabelforthe
sensor(s)ifdesired.Notethatbothsensorsarerequiredto
calculatedewpoint,whichisanadditionaldataseries
availableforplottingafterreadingoutthelogger.

3. Setupalarms(optional).ClicktheAlarmsbuttonifyou
wanttoconfigureanalarmtotripwhenthesensorreading
isaboveorbelowavalueyouspecify.SeeSettingupAlarms
fordetails.
4. Configurefilters(optional).ClicktheFiltersbuttonto
createadditionalfiltereddataseries.Anyfilteredserieswill
beavailableautomaticallyuponreadingoutthelogger.
5. SelecttheLoggingInterval.Selectaloggingintervalfrom1
secondtoamaximumof18hours,12minutes,and15
seconds.
6. SelecttheLoggingMode:
FixedInterval.InFixedIntervalmode,datawillalwaysbe
recordedattheregularloggingintervalsetinthe
previousstep.Thisisthedefaultsetting.
Burst.InBurstmode,loggingwilloccuratadifferent
intervalwhenaspecifiedconditionismet.SeeBurst
Loggingformoreinformation.
Statistics.InStatisticsmode,maximum,minimum,
average,andstandarddeviationstatisticsarecalculated
forallenabledsensorsduringlogging,samplingatan
intervalyouspecify.SeeStatisticsformoreinformation.
7. Choosewhentostartlogging:
Now.Loggingbeginsimmediately.
AtInterval.Loggingwillbeginatthenextevenintervalas
determinedbytheselectedlogginginterval.
OnDate/Time.Loggingwillbeginatadateandtimeyou
specify.
PushButton.Loggingwillbeginonceyoupressthe
Start/Stoploggingbuttonfor3seconds.
8. Choosewhentostoplogging:
WhenMemoryFills.Loggingwillendoncethelogger
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Burstisselected
fortheLoggingMode.

HOBOExternalTemp/RHDataLogger(UX100‐023A)Manual
1‐800‐LOGGERS4www.onsetcomp.com
PushButton.Loggingwillendonceyoupressthe
Start/Stoploggingbuttonfor3seconds.Notethatifyou
alsochoosePushButtontostartlogging,thenyouwill
notbeabletostoplogginguntil30secondsafterlogging
begins.
IfyouselectthePushButtonsetting,thenyoualsohave
theoptiontoselect“Allowbuttonrestart.”Thisallows
youtostopandthenrestartloggingduringthe
deploymentbypushingtheStart/Stopbuttononthe
loggerfor3seconds.
Important:When“Allowbuttonrestart”isselectedandyou
usetheStart/Stopbutton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Start/Stop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.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.
SpecificStopDate.Loggingwillendatadateandtime
youspecify.Notethatifyoualsoconfiguretheloggerfor
aPushButtonstopandto“Allowbuttonrestart,”then
theloggerwillstoploggingatthedateyouselect
regardlessofhowmanytimesyoustopandrestartthe
loggerwiththeStart/Stopbutton.
9. ChoosewhethertokeeptheLCDonoroff.Bydefault,the
LCDwillalwaysremainonwhilelogging.Ifyouselectthe
“TurnLCDoff”checkbox,theLCDwillnotshowthecurrent
readings,status,orotherinformationwhiletheloggeris
logging.Youwill,however,beabletotemporarilyturnthe
LCDscreenonbypressingtheStart/Stopbuttonfor1
secondifyouselectthisoption.
10. ClicktheStartbuttontolaunchthelogger.Disconnectthe
loggerfromthecomputeranddeployit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).
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.Tosetan
alarm:
1. ClicktheAlarmsbuttonfromtheLaunchLoggerwindow.
IftheAlarmsbuttonisdisabled,makesuretheLogging
ModeisnotsettoBurst.(Alarmscanonlybeconfigured
iftheloggerisinNormalorStatisticsmode.)
2. Selectasensor.Inthisexample,thetemperaturesensor
wasselected.

3. SelecttheHighAlarmcheckboxifyouwantanalarmto
tripwhenthesensorreadingrisesabovethehighalarm
value.TypethereadingnexttotheHighAlarmcheckbox
ordragthereduppersliderintheConfigureAlarms
window.
4. SelecttheLowAlarmcheckboxifyouwantanalarmto
tripwhenthesensorreadingfallsbelowthelowalarm
value.TypethereadingnexttotheLowAlarmcheckbox
ordragthebluelowerslider.
5. Setthedurationbeforeanalarmistripped.
6. SelecteitherCumulativeorConsecutive.Ifyouselect
Cumulative,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,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
temperature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.
7. Repeatsteps2through6fortheothersensorifdesired.
8. Choosehowlongtheloggershouldmaintainasensor
alarmonceithastripped.Select“Hosthasrelaunched
logger”ifyouwantthealarmtoremainvisibleonthe
LCDuntilthenexttimeyourelaunchthelogger.Select
“Sensorreadingwithinlimits”ifyouwantthealarmto
clearoncethesensorreadingreturnstothenormal
rangebetweenthehighandlowalarmlimits.Select
“Clearedwithbuttonpress”ifyouwantthealarmto
remainonuntilyoupresstheAlarm/Statsbuttononthe
logger.
9. ClickOKtosavealarmsettings.
Notes:
Oncetheloggerislaunched,alarmswilltripas
determinedbythesesettings.Loggeralarmswilldisplay

HOBOExternalTemp/RHDataLogger(UX100‐023A)Manual
1‐800‐LOGGERS5www.onsetcomp.com
ontheLCDscreen.Notethatthealarmlimitsareonly
checkedwhenthelogger’sLCDscreenrefreshesevery15
seconds.
Theactualvaluesforthehighandlowalarmlimitsareset
totheclosestvaluesupportedbythelogger.For
example,theclosestvalueto85°FthattheUX100series
loggercanrecordis84.990°Fandtheclosestvalueto
32°Fis32.043°F.Inaddition,alarmscantriporclear
whenthesensorreadingiswithinthelogger
specificationsof0.02°Cresolution.Thismeansthevalue
thattriggersthealarmmaydifferslightlythanthevalue
entered.Forexample,iftheHighAlarmissetto
75.999°F,thealarmcantripwhenthesensorreadingis
75.994°F(whichiswithinthe0.02°Cresolution).
Whenyoureadoutthelogger,highandlowalarmlevels
willbedisplayedontheplotalongwith“Chan<#>Alarm
Tripped”and“Chan<#>AlarmCleared”eventsshowing
whenthesensoralarmtrippedandcleared.The“Chan
<#>AlarmCleared”eventcontainsthevaluethatwas
furthestoutofrangeforthesensorbeforethealarm
cleared(seethePointstablefortheactualvalue).
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,let’ssaytheloggerisrecordingdataata5‐minute
loggingintervalandburstloggingisconfiguredtologevery10
secondswhenthetemperaturegoes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reaches
90°F,forexample,theloggerwillswitchtothefasterlogging
rateandrecorddataevery10secondsuntilthetemperature
fallsbackbelowthehighlimit(or85°Finthiscase).Atthat
time,loggingthenresumesevery5minutesatthenormal
logginginterval.Similarly,ifthetemperaturefallsto30°F,for
example,thentheloggerwouldswitchtoburstloggingmode
againandrecorddataevery10seconds.Oncethetemperature
risesbackto32°F,theloggerwillthenreturntonormalmode,
loggingevery5minutes.
Tosetupburstlogging:
1. SelectBurstforLoggingModeintheLaunchLogger
window.IfBursthasalreadybeenconfiguredforthis
logger,clicktheEditbuttonintheLaunchLogger
window.Notethatyoucannotsetupalarmswithburst
logging.YoualsocannotselecttheStopLoggingoption
“Never(wrapwhenfull)””ifburstloggingisconfigured.
2. IntheBurstLoggingwindow,selectasensor.Inthe
exampleatright,thetemperaturesensorwasselected.
3. SelecttheHighLimitcheckboxifyouwanttosetupa
conditioninwhichburstloggingwilloccurwhenthe
sensorreadingrisesabovethehighlimitvalue.Typein
thevalueordragtheredupperslider(seeexample
below).
4. SelecttheLowLimitcheckboxifyouwanttosetupa
conditioninwhichburstloggingwilloccurwhenthe
sensorreadingfallsbelowthelowlimitvalue.Typeinthe
valueordragthebluelowerslider.

5. Repeatsteps2through4fortheothersensor,ifdesired.
6. Settheburstlogginginterval,whichmustbelessthan
thelogginginterval.Selecteitherapresetburstlogging
intervalorselectCustomandenteryourown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.
7. ClickOKwhendone.ThiswillreturnyoutotheLaunch
Loggerwindow.ClicktheEditbuttonnexttoLogging
ModeintheLaunchLoggerwindowtomakeadditional
changes.
Notes:
Oncetheloggerislaunched,thehighandlowburst
logginglimitsareonlycheckedwhenthelogger’s
LCDscreenrefreshesonceevery15seconds.Therefore,
ifyousettheloggingintervaltolessthan15secondsand
thesensorreadingfallsoutsidethelimits,theburst
loggingwillnotbeginuntilthenext15‐secondrefresh
cycle.
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.Forexample,
theclosestvalueto85°Fthattheloggercanrecordis
84.990°Fandtheclosestvalueto32°Fis32.043°F.
Burstloggingmodecanbeginorendwhenthesensor
readingiswithintheloggerspecificationsof0.02°C
resolution.Thismeansthevaluethattriggersburst
loggingmaydifferslightlythanthevalueentered.For
example,ifthehighlimitforatemperaturealarmisset
to75.999°F,burstloggingcanstartwhenthesensor
readingis75.994°F(whichiswithinthe0.02°C
resolution).
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

HOBOExternalTemp/RHDataLogger(UX100‐023A)Manual
1‐800‐LOGGERS6www.onsetcomp.com
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willappearontheplot(ifyouselect
eventsforplottinginthePlotSetupwindow)eachtime
theloggerentersorexitsburstloggingmode.
Statistics
Statisticsisaloggingmodeinwhichtheloggercalculates
maximum,minimum,average,andstandarddeviationstatistics
duringlogging,recordingtheresultsateachlogginginterval
basedonsamplestakenatarateyouspecify.Thiswillresultin
uptofouradditionalseriespersensorthatrecordthefollowing
informationateachlogginginterval:
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,let’ssayboththetemperatureandRHsensors
havebeenenabled,theloggingintervalissetto5minutesand
thesamplingintervalissetto30seconds(withmaximum,
minimum,average,andstandarddeviationallenabled).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setupstatistics:
1. SelectStatisticsforLoggingModeintheLaunchLogger
window.IfStatisticshasalreadybeenconfiguredforthis
logger,clicktheEditbuttonintheLaunchLogger
window.
2. ClicktheMaximum,Minimum,Average,andStandard
Deviationcheckboxesforeachofthestatisticsyouwant
tocalculateduringlogging.NotethatAverageis
automaticallyenabledwhenselectingStandard
Deviation.Important:Statisticsapplytoallenabled
sensors;everyselectedstatisticwillbecalculatedforall
sensors(exceptbatteryvoltage).Forexample,ifboththe
temperatureandRHsensorshavebeenselectedinthe
LaunchLoggerwindowandyouselectAverage,thenthe
averagewillbecalculatedforbothtemperatureandRH.
Inaddition,themorestatisticsyourecord,theshorter
theloggerdurationandthemorememoryisrequired.

3. Setthesamplinginterval,whichmustbelessthananda
factorofthelogginginterval.Chooseeitherapreset
samplingintervalorselectCustomandenteryourown
samplinginterval.Keepinmindthatthemorefrequent
thesamplingrate,thegreatertheimpactonbatterylife.
4. ClickOKwhendone.ThiswillreturnyoutotheLaunch
Loggerwindow.ClicktheEditbuttonnexttoLogging
ModeintheLaunchLoggerwindowtomakeadditional
changes.
Onceloggingbegins,clicktheAlarm/Statsbuttononthelogger
tocyclethroughthecurrentmaximum,minimum,average,and
standarddeviationdataontheLCDscreen.Youcanplotthe
statisticsseriesonceyoureadoutthelogger.
ReadingOuttheLogger
Therearetwooptionsforreadingoutthelogger:connectitto
thecomputerwithaUSBcableandreadoutitwithHOBOware,
orconnectittoaHOBOU‐Shuttle(U‐DT‐1,firmwareversion
1.18m030orhigher)andthenoffloadthedatafilesfromthe
U‐ShuttletoHOBOware.RefertotheHOBOwareHelpformore
details.
RecordingInternalLoggerEvents
Theloggerrecordsthefollowinginternaleventstotracklogger
operationandstatus.YoucanplottheseeventsinHOBOware
afterreadingouttheloggerandopeningthedatafile.
InternalEventNameDefinition
HostConnectedTheloggerwasconnectedtothecomputer.
StartedTheStart/Stopbuttonwaspressedtobegin
logging.
StoppedTheloggerreceivedacommandtostop
recordingdata(fromHOBOwareorby
pushingtheStart/Stopbutton).
ButtonUp/Button
Down
TheStart/Stopbuttonwaspressedfor
1second.
Chan<#>Alarm
Tripped
Asensoralarmhastripped;#isthechannel
orsensornumberasshownintheLaunch
LoggerwindowinHOBOware.
Chan<#>Alarm
Cleared
Asensoralarmhascleared;#isthechannel
orsensornumberasshownintheLaunch
LoggerwindowinHOBOware.Thisevent
alsocontainsthevaluethatwasfurthest
outofrangeforthesensorbeforethealarm
cleared.
NewIntervalTheloggerhasenteredorexitedburst
loggingmode.
SafeShutdownThebatteryleveldroppedbelow2.5V;the
loggerperformsasafeshutdown.

HOBOExternalTemp/RHDataLogger(UX100‐023A)Manual


1‐800‐LOGGERS(564‐4377)•508‐759‐9500
www.onsetcomp.com/support/contact
©2013–2020OnsetComputerCorporation.Allrightsreserved.Onset,HOBO,andHOBOwareare
trademarksorregisteredtrademarksofOnsetComputerCorporation.Allothertrademarksaretheproperty
oftheirrespectivecompanies.
22934‐B

MountingtheLogger
Thereareseveralwaystomounttheloggerusingthematerials
included:
Usethefourbuilt‐inmagnetsonthebackoftheloggerto
mountittoamagneticsurface.
AttachtheCommandstriptothebackoftheloggerto
mountitawallorotherflatsurface.
Usethedouble‐sidedtapetoaffixtheloggertoasurface.
Insertthehook‐and‐loopstrapthroughthemounting
loopsonbothsidesoftheloggertomountittoacurved
surface,suchasapipeortubing.
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.IfthemessageFAILCLKappearsontheLCD
screen,therewasafailurewiththeinternalloggerclock
possiblyduetocondensation.Removethebatteryimmediately
anddrythecircuitboard.
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
www.onsetcomp.com.
BatteryInformation
Theloggercontainsa3VCR2032battery(HRB‐TEMP).Expected
batterylifevariesbasedontheambienttemperaturewhere
theloggerisdeployed,theloggingorsamplinginterval,
frequencyofoffloadingtothecomputer,numberofchannels
thatareactive,ifburstorstatisticsloggingmodesareactive,
andbatteryperformance.Anewbatterytypicallylasts1year
withloggingintervalsgreaterthan1minute.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.
TheloggercanalsobepoweredbytheUSBcablewhenthe
remainingbatteryvoltageistoolowforittocontinuelogging.
Connecttheloggertothecomputer,clicktheReadoutbutton
onthetoolbar,andsavethedataasprompted.Replacethe
batterybeforelaunchingtheloggeragain.
Toreplacethebattery:
1. HoldingtheloggerwiththeLCDscreenfacingup,pullthe
batterytrayoutoftheloggerhousing.

2. Removetheoldbatteryfromthetray.
3. Placethenewbatteryinthetraywiththepositiveside
facingdown.

4. WiththeLCDscreenstillfacingup,slidethetraybackinto
thelogger.TheLCDshoulddisplay“HOBO”brieflyafter
correctlyinstallingthebattery.
WARNING:Donotcutopen,incinerate,heatabove85°C
(185°F),orrechargethelithiumbattery.Thebatterymay
explodeiftheloggerisexposedtoextremeheatorconditions
thatcoulddamageordestroythebatterycase.Donotdispose
oftheloggerorbatteryinfire.Donotexposethecontentsof
thebatterytowater.Disposeofthebatteryaccordingtolocal
regulationsforlithiumbatteries.
HOBOwareprovidestheoptionofrecordingthecurrentbattery
voltageateachlogginginterval,whichisdisabledbydefault.
Recordingbatterylifeateachloggingintervaltakesupmemory
andthereforereducesloggingduration.Itisrecommendedyou
onlyrecordbatteryvoltagefordiagnosticpurposes.


Batterytrayremoved
fromlogger
CR2032batterybeing
placedinthetray,
positivesidefacing
down