Extech Instruments RH30 User manual

USERGUIDE
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HumidityAlert
PortableHygro‐Thermometer
withDewPoint
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ModelRH30
Introduction
ThankyouforselectingtheExtechModelRH30.TheRH30monitorsrelativehumidity,air
temperature,dewpointtemperature,andMAX‐MINreadings.TheRH30alsoincludesan
audible/visualhighhumidityalarm.Thisdeviceisshippedfullytestedandcalibratedand,with
properuse,willprovideyearsofreliableservice.PleasevisittheExtechInstrumentswebsite
(www.extech.com)tocheckforthelatestversionofthisUserGuide.ExtechInstrumentsisanISO‐
9001certifiedcompany.
Safety
GeneralSafety
oPleasereadallsafetyandinstructionalinformationbeforeusingthisproduct.
oThisproductisintendedforhomeuseonly.
oUnauthorizedrepairs,modifications,orotherchangestotheproductarenotsupported.
oThisproductisnotintendedforuseinmedicalpractices.
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Caution!RiskofInjury!
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oKeepthisproductanditsbatteriesoutofthereachofchildrenandpets.
oBatteriesmustnotbeplacedinfire,shortcircuited,takenapart,ordischarged.Riskof
explosion!
oBatteriescanbefatalifswallowed.Contactmedicalemergencypersonnelifbatteriesare
swallowed.
oBatteriescontainharmfulacids.Weakbatteriesshouldbechangedassoonaspossibleto
preventdamagecausedbyleakingbatteries.
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ProductSafety!
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oDonotplacethisproductnearextremetemperatures,vibration,orshock
oNeverholdaprobedirectlyinoroverfire
oDonotimmersethemetersinanyliquid

2RH30‐EN‐EUv1.411/13
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AL. ON
AL. OFF
F
C
o
o
65%
55%
60%
Description
MeterDescription
1. RelativeHumidityreading
2. AirTemperaturereading
3. DewPointreading(Td)
4. HumidityAlarmindicator
5. Batterycompartment
6. Resetbutton
7. MIN‐MAXbutton
8. Meterstand
9. AlarmON/OFFswitch(rear)
10. TemperatureUnitsswitch(rear)
11. RHAlarmsettingswitch(rear)
12. Wallmountaccesshole(rear)
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TemperatureandHumiditychart(Forgeneralreferenceonly)
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Operation
DisplayProtectiveFoil
TheLCDdisplaymayincludeaprotectivefoilcovering.Carefullyremovethisfilmbeforeuse.
Poweringthemeter
Openthebatterycompartmentbyslidingthefrontbatterycompartmentcoverdownward.Ifthe
meterisnewandbatteriesareinstalled,thebatteryinsulationstripmustberemovedbefore
usesothatthebatteriescanmakepropercircuitcontactandpowerthemeter.Ifnobatteries
areinstalled,pleaseinserttwo1.5VAAbatteriesorientedforproperpolarity.
Theinstrumentshouldnowbepoweredupandrelativehumidity,temperature,anddewpoint
temperatureshouldbedisplayedlefttorightontheLCD.
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EUconsumersarelegallyboundbytheBatteryOrdinancetoreturnusedbatteriesto
communitycollectionpointsorwhereverbatteries/accumulatorsaresold.Disposalin
householdtrashorrefuseisprohibited.
Disposal:Followthevalidlegalstipulationsinrespectofthedisposalofthedeviceat
theendofitslifecycle.

3RH30‐EN‐EUv1.411/13
Mounting
TheRH30canbewallmountedusingtherearwallmountaccessholeoritcanbeplacedona
desktoporothersurfaceusingthesuppliedstandbase.
SelectingoC/oFunitsofmeasure
Usetherear(center)oC/oFswitchtoselectthedesiredtemperatureunitofmeasure.
MAX‐MINandHOLDFunction
TheRH30storesthehighest(MAX)andlowest(MIN)readingssincethemeterwaslastreset.To
viewthemaximum(MAX)reading,presstheMIN‐MAXbutton(rightside,lower).Allreadings
displayedwillnowrepresentthehighestreadingsencounteredsincelastreset.TheMAX
indicatorwillalsoappearontheleftandmiddledisplaysforconfirmation.PresstheMIN‐MAX
buttonagaintoviewthelowestreadings(MIN)sincethelastreset.Allreadingsdisplayedwill
nowrepresentthelowestreadingsencounteredalongwiththeMINindicators.Toreset(clear)
theMAX‐MINmemories,pressRESET(rightside,upperbutton)whileMAXorMINisdisplayed.
RelativeHumidity(RH)Alert
TheRHAlarmtriggersanaudibletoneandtwovisualalerts(frowningfacesymbolilluminates
anduparrowappearsnexttothehumidityreadout)whentheRHexceedsthevaluesetbythe
user.Thelimitswitchontherear(right)ofthemetercanbesetto55%,60%,or65%RH.
WhentheRHreturnstothedesiredrangetheaudiblealarmwillstopsoundingandthefrowning
facesymbollightwillswitchoff.Thearrowwillremainhowevertoshowthatthehumiditywas
higherthanthesetvalueatleastonceinthepast.Toggletherearhumidity%limitswitchto
turnoffthearrow.
PracticalConsiderations
TheBasics
TheRH30thermo‐hygrometermonitorsambientroomconditionsandalertstheuserwhenthe
relativehumidityexceedstheuserprogrammedlimit(usetherearhumidity55/60/65%switch
tosetthelimit).
Excessivelyhumidroomaircanaffecthealth,promotingtheformationofmoistureandmold.At
theotherextreme,excessivelydryroomaircanalsoaffecthealthbydryingskin,mucous
membranes,andairways.Pets,houseplants,woodflooring,antiquefurniture,fineart,musical
instruments,etc.areallaffectedbyextremesinambientconditions.Effectiveheatingand
ventilationcanhelpachieveacomfortableandhealthylivingenvironmentandcanalsocut
costs.
TheBenefitsofVentilation
Forroomsthataretoohumid,ventilationatfirstmayseemabadideainwinterwhenoutdoor
airisalsocold,damp,andjustashumid.Coldairhowevercanabsorblittleornomoisture.
Whencoldairentersalivingareaitbecomeswarmerandcanthereforeabsorbmuchmore
watervapor;inonlyafewminutesthehumiditydecreases.

4RH30‐EN‐EUv1.411/13
DewPointTemperature
DewPointisawindowintotherelationshipbetweenTemperatureandHumidity.Forexample,if
airiscooledataconstant(absolute)humidity,therelativehumiditywillsteadilyincreasetoa
maximumof100%.Iftheairiscooledfurther,theexcesswatervaporwillseparateintheform
ofwaterdroplets.IftheRH30indicatesanairtemperatureof20oC(60oF)andarelativehumidity
of65%,thedew‐pointtemperaturewillbe13.2oC(56oF).Thismeansthatifwallsorceilingsina
livingareaarecoolerthan13.2oC(56oF),theairwillcondenseandformdropletsonthewalls
andceilingsurfaces.Moldanddamppatchescanresult.Inthissameexample,whentherelative
humidityoftheairis40%,thedewpointtemperatureisonly6oC(43oF).Surfaceswouldhaveto
besignificantlycolderfortheairtoreachitsdewpointtoformwaterdroplets.
TipsonAchievingOptimumAmbientConditions
oCheckthatthedewpointtemperatureofwallsisatleast15oC(59oF).
oDonotswitchoffhomeheatingcompletelywhenleavingthehouse.
oVentilateforshortperiodsonlyinallweatherconditions,evenduringrain.
oAirroomsbyopeningwindowsforashorttimeonly.Partiallyopenedwindowsforprolonged
periodsdonotyieldthedesiredresults,wasteenergy,andcanfurtherpromotethegrowthof
mold.
oIfroomairistoodry(asittendstobeinwinter),humidifierunitsarehighlyrecommended
sinceairingatlowoutdoortemperatureswilltendtodecreasehumidityfurther.
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Specifications
Display Multi‐functionLCD
Sensor Swissprecisionhumiditysensorforquickandaccuratereadings
MeasurementrangeRelativeHumidity:1.0to99.0%RH
AirTemperatureandDewPointTemperature:‐10to50oC(14to122oF)
Resolution0.1oC(oF)and%
HumidityAccuracy±4%from35%to75%otherwise±5%
Temp.Accuracy±1.0oC(1.8oF)
Powersupply2x1.5VAAbatteries
Dimensions95x25x95mm(3.7x1.0x3.7")
Weight 90g(3.2oz.)instrumentonly,batteriesnotincludedinweightspec.
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Copyright©2013FLIRSystems,Inc.
Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform
www.extech.com
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