Extech Instruments AN320 Manuel utilisateur

USERGUIDE

LargeVaneCFM/CMM

Anemometer/Psychrometer+CO2

ModelAN320

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

AN320-en-GB_V1.2 11/14

Introduction

CongratulationsonyourpurchaseoftheExtechAN320VaneAirflowAnemometerPsychrometer

+CO2.ThisinstrumentmeasuresAirVelocity,AirFlow(volume),AirTemperature,Relative

Humidity,WetBulbTemperature,DewPointTemperature,andCO2(carbondioxide).Thelarge,

easy‐to‐readbacklitLCDincludesprimaryandsecondarydisplaysplusnumerousstatusindicators.

Theoptionalroundandsquareairflowconeadaptorsallowforquickairflow(volume)

measurements.Thismeterisshippedfullytestedandcalibratedand,withproperuse,willprovide

yearsofreliableservice.Pleasevisitourwebsite(www.extech.com)tocheckforthelatestversion

ofthisUserGuide,ProductUpdates,andCustomerSupport.

CAUTIONS

Improperuseofthismetercancausedamagetothemeterandpersonalinjury.Readand

understandthisusermanualbeforeoperatingthemeter.

Inspecttheconditionoftheprobeandthemeterforanydamagebeforeoperatingthe

meter.Repairorreplacedamagebeforeuse.

Iftheequipmentisusedinamannernotspecifiedbythemanufacturer,theprotection

providedbytheequipmentmaybeimpaired.

Thisdeviceshouldnotbemadeavailabletochildren.Itcontainshazardousobjectsaswell

assmallpartsthatcanbeaccidentallyswallowed.Themeter’sbatteriesandpacking

materialcanalsobedangeroustochildren.

Intheeventthatthemeteristobeunusedforanextendedperiodoftime,removethe

batteriestoprotectagainstbatteryleakage.

Expiredordamagedbatteriescanbehazardousifallowedtocomeincontactwithskin.Use

suitablehandprotectioninsuchcases.

Donotshortcircuitbatteriesorputbatteriesinfire.

AN320-en-GB_V1.2 11/14

MeterDescription

MeterDescription(front)

1. ToplineLCDdisplayreading

2. BottomlineLCDdisplayreading

3. U/modeAVGanduparrowbutton

4. L/modeanddownarrowbutton

5. ON‐OFF(Power)andSETbutton

6. HOLD,MAX‐MIN,andleftarrow(Enter)button

7. Unitofmeasuresymbolforlowerdisplayrow

8. Unitofmeasuresymbolforupperdisplayrow

9. AirVelocityVane

MeterDescription(rear)

10. Airtemperature,humidity,andCO2sensors

11. Batterycompartment



AN320-en-GB_V1.2 11/14

SET

HOLD

MAX/MIN

U/mode

AVG

▲

L/mode

▼

U/mode

AVG

▲

U/mode

AVG

▲

L/mode

▼

BriefKeypadDescription



PressmomentarilytoswitchthemeterONorOFF.Pressandholdthisbuttonfor2

secondstoenterorexittheSetupmode(refertoSetupmodesectionfordetails).



oPressmomentarilytofreezethedisplayedreading(HOLDiconswitchesON);press

againmomentarilytoexittheHOLDmode(HOLDiconswitchesOFF)

oPressandholdfor2secondstodisplaytheMIN(minimum)reading;pressandhold

againtodisplaytheMAX(maximum)reading;Pressandholdathirdtimetoexit

oThisbuttonisalsousedintheAVERAGEmode(forrecordingreadingsoneatatime

orfora‘timed’recordingsession)andintheSETUPmode(forconfiguringthe

meter).PleasereviewtheAVERAGEandSETUPmodesectionsfordetails



Pressmomentarilytotogglebetweenppm(CO2),humidity,andairvelocityreadings.

Pressandholdfor2secondstoaccesstheMulti‐PointAverageandTimedAverage

modes(theAVGiconswitchesON).Detailedinstructionsforthesemodesareprovided

laterinthisguide.IntheSetupmodepresstoselectacategoryortoincreaseavalue

(refertoSetupmodelaterinthisguide)



Presstotogglethelowerdisplaybetweenairtemperature,airvolume,wetbulb

temperature,anddewpointtemperaturereadings;AlsousedintheMulti‐Point

Average,TimedAverage,andSetupmodes;refertotheAVERAGEandSETUPmodes

sectionslaterinthisguide



 

+WiththemeterswitchedOFF,pressandholdthesetwobuttonstodisable

AutoPowerOFF.DetailedAUTOPOWEROFF(Sleepmode)instructionsare

providedlaterinthisguide





++ Pressall3buttonssimultaneouslytoentertheCalibrationmode.

Calibrationinstructionsareprovidedindetaillaterinthisguide



AN320-en-GB_V1.2 11/14

DisplayLayout

1. LowerDisplaydigits(airvolume,temperature,timer,ormenuparameterdisplays)

2. UpperDisplaydigits(airvelocity,humidity,CO2,ormenudisplayparameters)

3. OptionalConeorFunnelattachmenticon

4. Unitsofmeasureforductareaprogramming

5. Vaneindicator(flashesverybrieflyonpowerup)

6. DisplayHOLDicon

7. MAXmodeicon

8. MINmodeicon

9. Recordingicon

10. ElapsedTimericon

11. AVGmodeicon

12. Batterystatusicon

13. Unitofmeasureicons*



*Fulllistshown.Availableunitsofmeasureiconsvarybymodel.

AN320-en-GB_V1.2 11/14

Operation

AirVelocityandAirVolumeMeasurements

1. SwitchthemeterONbypressingthePOWER buttonmomentarily.Themeterwill

countdownfrom30to0asitperformsaself‐test.PressthePOWERbuttonagaintoswitch

themeterOFF.

2. Notethatthemeterwillautomaticallyenterthesleepmodeafter20minutesofinactivity.

Todisablethisfeature:withthemeterOFF,pressandholdthePOWERandtheU/mode

buttonsfor2seconds.TheLCDwilldisplay'n'asitswitchesON.Nowthesleepmodeis

disabledandtheusermustpressthePOWERbuttonmomentarilytoswitchthemeterOFF.

3. WhenthemeterisON,theupperdisplaycanindicate

airvelocity,relativehumidity,orCO2(usetheU/mode

buttontoscroll).Thelowerdisplaydigitscanindicate

airflow,dewpointtemperature,wetbulbtemperature,

orairtemperature(usetheL/modebuttontoscroll).

4. Placethesensorintheairstream.Theairmustenter

thevanefromtherearofthemeter.TheAir

Temperature,Relativehumidity,andCO2sensorsarelocatedatthecenterofthevaneon

therearofthemeter.

5. ReadthemeasurementdataontheLCD.Airvelocityreadingsareindicatedinmetersper

second(m/s)orfeetperminute(fpm).Temperaturereadings(air,dewpointDP,orwetbulb

WBT)areindicatedin°C/°F.Airflow(volume)isindicatedinCFM(cubicfeetperminute)or

CMM(cubicmetersperminute).UsetheL/modebutton(forlowerdisplay)andtheU/mode

button(forupperdisplay)toscrollthroughthedisplayedreadingoptions.

6. TochangebetweenImperialandMetricunitsofmeasurerefertotheSETUPModesection.

7. TomeasuretheAirVolumeofaduct,firstmeasuretheduct’sarea(seetheAppendixfor

areacalculations)andthenentertheareavalueinthemeter’sSETUPmodeinin2orcm2.

Aftertheareavaluehasbeenentered,usetheL/modebuttontoscrolltotheairvolume

display(CMM/CFM)onthelowerdigits.Placethemeterinairstreamtomeasurevolume.

8. Optional:measureAirVolumewithanairflowConeorSquareadaptorbyfirstattachingone

oftheadaptorstothemeter(theoptionalconeadaptorkitincludesaroundandasquare

cone;kitpartnumberAN300‐C).Themeterwillautomaticallyrecognizethattheadaptoris

attachedtothemeterandaconeiconwillappearonthedisplay.Note:regardlessofthe

AREAsettingintheSETUPmode,themeterwilldefaulttothedimensionsofthevane

opening.Ensurethattheairflowadaptoriswellmountedandlockedbeforetaking

measurements.

LCDbacklight

PresstheU/modebuttontoswitchONtheLCDbacklight.Thebacklightwillautomaticallyswitch

OFFafterapproximately10secondstoconservebatterypower.Notethatthebacklighting

switchesONautomaticallywhenthemeterisswitchedONbytheuser.

AN320-en-GB_V1.2 11/14

RelativeHumidity,WetBulb/DewPointTemperature,andCO2Readings

Sensorsarebuiltintothecenterofthevane(rearofmeter)andareusedtomeasurerelative

humidity,airtemperature,andCO2.WetBulbandDewPointtemperaturesarecalculatedbased

ontemperatureandhumidityreadings.

1. PressU/modetoscrolltoRH(%)orCO2(ppm)modes.Themeasuredrelativehumidityor

carbondioxidereadingswillbedisplayedontheupperLCDdigitsasselected.

2. UsetheL/modebuttontoscrollthroughairtemperature,dewpointtemperature,wetbulb

temperature,andairflow(volume)readings.

3. Tomeasurethehumidityusinganoffsetreferencevalue,pleaseaccesstheSetupmodeand

inputtheoffsetvalueasdescribedintheSetupmodesection.TheLCDwilldisplaythe

measuredvalueminustheoffsetvalueoncetheoffsetisprogrammedintheSetupmode.

DataHoldMode

1. PresstheHOLDbuttonfromthenormaloperatingmodetofreezethecurrentmeasurement.

2. The‘HOLD’iconwillappearatthetopoftheLCDdisplay.

3. PressHOLDagaintoreturntonormaloperation.The‘HOLD’iconwillswitchOFFandthe

meterwillreturntodisplayingreadingsinrealtime.

MAX/MINMode

TheMAX‐MINfeaturerecordsthehighest(MAX)andlowest(MIN)readingscapturedsincethe

MAX‐MINmodewasaccessed.

1. PressandholdtheMAX/MINbuttonfor2secondstobegindisplayingthelowest(minimum)

readingsencounteredsincethismodewasaccessed.The‘MIN’iconwillappearatthetopof

theLCDdisplayindicatingthatthereadingsshownarethelowestmeasured.

2. PressandholdtheMAX/MINbuttonagainfor2secondstodisplaythemaximumreadings

encountered.The‘MAX’iconwillappearontheLCD.

3. Pressandholdthisbuttonagainfor2secondstoreturntothenormalmodeofoperation

(the‘MIN’and‘MAX’iconsshouldswitchOFF).

4. WhileviewingtheMAXorMINdata,usetheL/modebuttontoswitchthedisplaysothatthe

AirVolumeMINandMAXreadingscanbeviewedalso.

5. PressandholdMAX/MINfor2secondstoreturntothenormaloperationmode.

Multi‐PointAverageMode

1. FromthenormaloperatingmodepresstheU/modebuttonfor2secondstoenterMulti‐

PointAveragemode(theAVGdisplayiconandtheassociatedblackdot•willswitchON).

2. PresstheHOLDbuttonmomentarilytorecordonereading.Theupperdisplaydigitswill

showthereading’smemorylocationnumberandthelowerdisplaywillshowthemeasured

value.PresstheHOLDbuttonagaintotakeandstoreanotherreading;thememorylocation

numberwillincrementbyoneandthecurrentreadingwillbestoredinthisnewmemory

location.

3. PressU/modemomentarilytoseethemulti‐pointmean(average)forallofthereadings

recordedduringthesession(the'•AVG'displayiconwillflashduringthisprocess).

4. PressL/modetoviewtheaveragereadingfortheotheravailableparameters.

5. PressU/modemomentarilytoreturntothenormaloperatingmode.

AN320-en-GB_V1.2 11/14

TimedAverageMode

1. Fromthenormaloperatingmode,pressandholdtheU/modebuttonfor2secondstoenter

theMulti‐PointAveragemodefirstandthenpressU/modeonemoretimemomentarilyto

entertheTimedAverageMode(theAVGandtheelapsedtimer iconswillswitchON).

2. PressHOLDtobeginrecording.Theelapsedtimerstarts(asshownontheupperdisplay

digits)andtheclockiconflashesonandoff.

3. PressU/modetostoptheclockandtocalculatethetimedaverage.TheupperLCDwill

displaytheelapsedtimeandthelowerLCDwillshowtheaveragedreadings.TheLCDwill

flashthe'AVG'andtheelapsedtimericons.

4. PressL/modetoviewtheaverageforotheravailablemeasurements.

5. PressU/modetoreturntothenormaloperatingmode.



SetupMode

EnteringSetupMode

PressandholdthePOWERSETbuttonfor2secondstoenterSetupmode.Twooptionsare

available:P1.0:UnitandP2.0:AREA.

Usetheup/downbuttonstotogglebetweenP1.0UNITandP2.0AREAoptions.

P1.0:UnitSelection

1. Onceinsetupmode,attheP1.0UNITdisplay,momentarilypresstheHOLDbuttontoenter

theP1.0UNITmenu.

2. Useeitherarrowbuttontoswitchbetweenmetricandimperialunits.Theavailableunits

are:airvelocity(m/s,fpm),temperature(C,F),airvolume(CMM,CFM),andareasize(cm²,

inch²).

3. PressHOLDmomentarilytoreturntotheP1.0display.

4. PresseitherarrowbuttontomovetotheP2.0AREAoptionandfollowthestepsbelow.

P2.0:AreaSizeSelection(entersquareinchesorsquarecentimeters)

1. Insetupmode,fromtheP2.0AREAdisplay,pressHOLDtoentertheAREAsettingmenu.The

LCDwillshow‘99999’inthelowerdisplaywiththefirstdigitflashing.

2. Usetheuparrowbuttonchangetheflashingdigit(from0through9).

3. Usethedownarrowbuttontomovetothenextdigit.Usetheuparrowbuttonagainto

changetheflashingdigit.ContinueinthiswayuntilthedesiredAREAvalueisdisplayed.

4. PresstheHoldbuttonagainmomentarilytostorethevalueandtoreturntotheP2.0display.

5. PresseitherarrowbuttontomovetotheP3.0RHOFFSEToptionandfollowthestepsbelow.

P3.0:RelativeHumidity(RH)OffsetSelection

1. WheninsetupmodeP3.0pressHOLDtoentertheRHoffsetsetting.TheLCDwillshow0.0

RHintheupperdisplay.

2. PressU/modetoincreaseoffsetvalueandL/modetodecreaseoffset.

3. PresHOLDoncemoretoreturntoP3.0.

4. PressandholdthePOWERSETbuttonfor2secondstoreturntothenormaloperating

mode.

AN320-en-GB_V1.2 11/14

P4.0:AltitudePressureCompensation

5. WheninsetupmodeP4.0,pressHOLDtoenterthepressurecompensationparameter.The

LCDwillshowhPA(unitofmeasure:hector‐Pascalormillibar)onthelowerlineanda

flashing4‐digitnumber(from700to1990;thedefaultis1013hPAwhichisstandard

pressure)ontheupperline.

6. PressU/modetoincreasethepressurevalueandL/modetodecreaseit.

7. PressHOLDoncemoretoreturntoP4.0.

8. PressandholdthePOWERSETbuttonfor2secondstoreturntothenormaloperating

mode.

Calibration

CAUTION:DonotcalibratethemeterinairwithanunknownCO2concentration.Doingsowill

resultinthemeterbeingcalibratedtothestandard400ppmandcouldleadtoinaccurate

results.

1. Placethemeterinacalibratedenvironment.

2. WiththemeterOFF,pressSET,HOLDandL/modesimultaneouslytoenterCO2calibration

mode.

3. Themeterwillruna30secondcountdownand'CAL'willshowinthelowerdisplay.

4. DuringcalibrationaCO2readingbetween380‐420ppmwillflashintheupperdisplay.

5. Waitforapprox.10minutesforthereadingtostopflashing.

6. Thecalibrationisnowcompleteandthemeterwillreturntothenormaloperatingmode.

7. Toabortthecalibrationatanytime,turnOFFthemeter.

8. IfthecalibrationfailsforanyreasonpleasereturnthemetertoExtechInstrumentsforan

evaluationandpossiblerepair.

AN320-en-GB_V1.2 11/14

BatteryReplacement

WhenappearsontheLCD,theAAAbatteriesmustbereplaced.Thebatterycoverislocated

onthebackofthemeter.

1. Opentherearbatterycompartmentbycarefullypullingdownonthecompartment’slatch.

2. Thebatterycompartmentcovershouldbecompletelyremovedbeforeproceeding.

3. Replacethefour(4)1.5V‘AAA’batteriesensuringproperpolarity.

4. Closethebatterycompartmentbeforeattemptingtouse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.



OtherBatterySafetyReminders

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

oNevermixbatterytypes.Alwaysinstallnewbatteriesofthesametype.

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