Extech Instruments IRT600 User manual

USERGUIDE

DewPointTemperatureDetector

withLaserPointer



MODELIRT600

IRT600‐EU‐ENv1.49/132

Introduction

CongratulationsonyourpurchaseoftheModelIRT600DewPointTemperatureDetector!The

IRT600iscapableofdisplayingAirTemperature(AT),SurfaceTemperature(ST),Relative

Humidity(RH),andDewPointTemperature(DP)andcananalyzethepotentialformildew.The

LEDlampabovetheLCDdisplaychangescolortoindicatethepotentialformildew:green(no

mildew),yelloworamber(lowtomoderateprobabilityofmildew),andred(highprobabilityof

mildew).



TheIRT600measuresSurfaceTemperatureusinganinfrared(IR)sensorandincludesdualred

laserpointersforimprovedtargeting.TheIRsensorhasa12:1DistancetoSpotratio.Thismeans

thatatarget30cmawayfromthemeterhasaspotdiameterof1.25cm,atarget45cmawayhas

aspotdiameterof3.75cm,andsoon.Theclosertothetarget,thesmallerthespotsizeandthe

furtheraway,thelargerthespotsize(verymuchlikeaflashlightbeambehaveswithregardto

distance‐to‐spotratio).



TheAirTemperatureandRelativeHumidityaremeasuredbytheinternalsensorsatthetopof

themeter.DewPointTemperatureiscalculatedusingAirTemperatureandRelativeHumidity

measurements.MildewanalysisisbasedoncalculationsmadefromAirTemperature,Surface

Temperature,DewPointTemperature,andRelativeHumidityvalues.



Thismeterisshippedfullytestedandcalibratedand,withproperuse,willprovideyearsof

reliableservice.Pleasevisitthewebsitewww.extech.comforthelatestversionofthisUser

Guide,CustomerSupport,andinformationonotherproductsofferedbyExtechInstrumentsand

FLIRSystems.

Safety



Useextremecautionwhenthelaserpointerbeamison

Donotpointthebeamtowardanyone’seyeorallowthe

beamtostriketheeyefromareflectivesurface.

Donotusethelasernearexplosivegasesorineither

potentiallyexplosiveareas.

Donotcleanthelaserwithanycorrosiveacidsorliquids.

Useanappropriate(9V)batterytopowerthemeter.



IRT600‐EU‐ENv1.49/133

MeterDescription



1. Multi‐colormildewstatusindicator

2. LCDdisplay

3. MODEbutton

4. BacklightandLaserpointerbutton

5. Batterycompartment

6. Measurementtrigger

7. Temperatureunitsbutton

8. LaserPointersandInfraredsensor

9. Humidity/Temperaturesensors

Display Description



1. Emissivitysetting(fixedat0.95)

2. AirTemperatureicon

3. LaserPointerONicon

4. Batterystatus

5. Bargraphrangemaximum(100%)

6. RH,AirTemperatureorDewPointreading

7. Unitofmeasure

8. Surfacetemperaturereading

9. Bargraph

10. Bargraphrangeminimum(0%)

IRT600‐EU‐ENv1.49/134

Operation

PoweringtheMeter

PressthetriggeroncetopowerthemeterONorOFF.



TurntheBacklightOn/Off

Pressthebacklight/laserbuttontoturnthebacklightonoroff.



SelectingoC/oFunitsofmeasure

PresstheoC/oFkeytoselectthedesiredtemperatureunitofmeasure.



TurntheTwoRedLaserPointersOn/Off

Pressthebacklight/laserbuttontoturnthelaserpointersONorOFF.



TakingMeasurements

TheIRT600candisplayDewPointTemperature(DP),AirTemperature(AT),InfraredSurface

Temperature(ST),andRelativeHumidity(%RH).Thebottomdisplaydigitsalwaysshowthe

SurfaceTemperaturereading.TheupperdisplaydigitsalternatelyshowAirTemperature,Dew

PointTemperature,orRelativeHumiditydependingonthemodethatisselected.Themulti‐color

statusLEDlight(locatedabovetheLCDdisplay)changescolortoindicatethelikelihoodofmildew

(seethe‘DetectingMildew’section).



1. PressthetriggeroncefirmlytoswitchthemeterON.

2. UsetheMODEbuttontoselectAirTemperature,DewPointTemperature,orRelative

Humidity%fortheupperdisplaydigits.Themeterwillrememberthedisplayselection

afterthemeterisswitchedOFF.

3. ForSurfaceTemperaturemeasurements,pointthemeter

towardthesurfaceundertest.Thelowerdisplaydigitsshow

thetemperatureofthesurfaceundertest.Forprecise

targeting,usethedualredlaserpointers(thebacklight/laser

pointerbuttonswitchesthepointersONorOFF).TheIR

sensorhasa12:1distance‐to‐spotratio(seeaccompanying

‘fieldofview’diagram).Forexample,ata30cmdistance,

themeasuredspotsizeis2.5cm.

4. PressthetriggerfirmlyagaintoswitchthemeterOFF.



IRSurfaceTemperatureMeasurementNotes

1. Theobjectundertestshouldbelargerthanthespot

(target)sizecalculatedbythefieldofviewdiagram(printed

onthesideofthemeterandinthisguide).

2. Beforemeasuring,besuretocleansurfacesthatare

coveredwithfrost,oil,grime,etc.

IRT600‐EU‐ENv1.49/135

3. Ifanobject'ssurfaceishighlyreflective,applymaskingtapeorflatblackpainttothe

surfacebeforemeasuring.Allowtimeforthepaintortapetoadjusttothetemperatureof

thesurfaceitiscovering.

4. Measurementscannotbemadethroughglass.

5. Steam,dust,smoke,etc.canobscuremeasurements.

6. Themeterautomaticallycompensatesfordeviationsinambienttemperature.However,it

cantakeupto30minutesforthemetertoadjusttoextremelywidechanges.

7. Tofindahotspot,aimthemeteroutsidetheareaofinterestthenscanacross(inanup

anddownorsidetosidemotion)untilthehotspotislocated.

DetectingMildew

Todetectmildew,takeaSurfaceTemperaturemeasurementasdescribedearlierbypointingthe

meteratthedesiredobject(s)andmovingthemeterslowly,notingthesurfacetemperatureof

theobject(s)undertest.



AlsonotetheAirTemperature,DewPointTemperatureandRelativeHumiditytolearnhowthese

relationshipsaffectmildewpotential.Themeterautomaticallydetectsthelikelihoodofmildew;

nonethelessitisusefultoseehowonemeasurementaffectsanotherandhowthecombinations

ofthesemeasurementsandcalculationsleadtoanaccuratemildewanalysis.



ThelikelihoodofmildewishighertheclosertheSurfaceTemperatureistotheDewPoint

Temperature.(TheDewPointtemperaturetakestheRelativeHumiditymeasurementinto

account,sincethehighertheRH,thehighertheDewPointTemperature).



ThemeterusestheAirTemperature(AT)andtheDewPointTemperature(DP)valuestocreatea

rangeoftemperaturesthatisdividedintothirds(seeaccompanyingdiagram).Theupper

boundaryistheAirTemperature(AT)andthelowerboundaryistheDewPointTemperature(DP).



IRT600‐EU‐ENv1.49/136



Ifthesurfacetemperaturelieswithintheupperthirdtemperaturerangebetweentheair

temperatureandthedewpointtemperature,theLEDwillbegreen,indicatingthatthesurface

temperatureandhumidityarebothnormalandmildewisunlikely(seediagram).



Ifthesurfacetemperaturelieswithinthemiddlethirdtemperaturerangebetweentheair

temperatureandthedewpointtemperature,theLEDwillbeyellow(amber),indicatingthat

thereisalowtomoderatepotentialformildew.



Ifthesurfacetemperaturelieswithinthebottomthirdtemperaturerangebetweentheair

temperatureandthedewpointtemperature,theLEDwillbered,indicatingthatthereisahigh

probabilityofmildewpresentonthesurfaceundertest.



Forexample,iftheairtemperatureis25°Candtherelativehumidityis50%,thedewpoint

temperatureis13.8°C.Inthisexample,thelightwouldbegreenwhenthesurfacetemperatureis

between25and21.3°C;ayellowlightwouldindicateasurfacetemperaturebetween21.2and

17.4°C;andaredlightwouldindicateasurfacetemperaturebetween17.3and13.8°C.



BatteryReplacement



Toreplacethebattery:



1. Openthebatterycover(locatedonthehandlegrip)

2. Carefullyremovethebattery

3. Installnew9Vbattery

4. Closethebatterycoverbeforeusingthemeter

Neverdisposeofusedbatteriesorrechargeable

batteriesinhouseholdwaste.

Asconsumers,usersarelegallyrequiredtotakeused

batteriestoappropriatecollectionsites,theretailstorewherethebatterieswere

purchased,orwhereverbatteriesaresold.

Disposal:Donotdisposeofthisinstrumentinhouseholdwaste.Theuserisobligatedtotake

end‐of‐lifedevicestoadesignatedcollectionpointforthedisposalofelectricalandelectronic

equipment.



BatterySafetyReminders

oNeverdisposeofbatteriesinafire.Batteriesmayexplodeorleak.

oRemovebatteryfrommeterifitistobestoredforalongtimeperiod.



IRT600‐EU‐ENv1.49/137

Specifications



MainDisplay BacklitLCDwithmulti‐functionindicators

Three‐colorLEDindicatorGreen,Amber,andRedtoindicatemildewpotential

Responsetime <1second

DiodeLaserPointersOutput<1mW,Wavelength630~670nm,Class2(II)Laserproduct

Emissivity0.95(fixed)

IRSpectralResponse8‐14µm

IRSensorFieldofView12:1(Distance‐to‐SpotRatio)

Operatingtemperature0oCto50oC(32oFto122oF)

Storagetemperature‐20oCto60oC(‐4oFto140oF)

Relativehumidity10%~90%RHoperating,<80%RHstorage

Powersupply9Vbattery,NEDA1604AorIEC6LR61,orequivalent

Weight163g(5.7oz.)

Dimensions168x82x58mm(6.6x3.2x2.3”)



RangeResolutionAccuracy

AirTemperature‐50to350°C(‐58to662°F)

Surfacetemperature‐50to350°C(‐58to662°F)

DewPointTemperature‐30to100°C(‐22to212°F)

0.1°F/C



±3.5°C(6.3°F)

‐50to20°C(‐58to32°F)

±(1%rdg+1.5°C[2.7°F])

20to350°C(32to662°F)

RelativeHumidity0to100%0.1°%±3.5%(20%to80%)

Note:Accuracyisgivenat64°Fto82°F(18°Cto28°C);<80%RH



Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform

ISO‐9001Certified

www.extech.com

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