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



Copyright©2013FLIRSystems,Inc.
Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform
ISO‐9001Certified
www.extech.com