Extech Instruments AN340 Manuel utilisateur

USERGUIDE

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Mini‐VaneCMM/CFM

Anemometer/Psychrometer+Datalogger

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ModelAN340

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AN340-EU-EN V1.3 4/13

Introduction

ThankyouforselectingtheExtechAN340CMM/CFMAnemometerPsychrometerDatalogger.This

instrumentmeasuresAirVelocity,AirFlow(volume),AirTemperature,RelativeHumidity,WetBulb

Temperature,andDewPointTemperature.



Themeter’scompactminiimpellerisperfectforductairflowmeasurements.Thesensorprobehas

an18mm(0.7”)diameteranda1M(39”)telescopingprobewandwithamarkedscale.Duct

temperaturedoesnotaffecttheairflowmeasurementresults.Temperatureandhumiditysensors

arebuiltintothevanesensor.

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Theusercanmanuallystoreandrecall99readingsdirectlyonthemeter’sLCD.Theusercanalso

automaticallylogupto12,000readingswithdateandtimestampandselectablesamplingrate.

ReadingsaretransferredtoaPCusingthesuppliedPCsoftwareandUSBconnectorcable.

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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

materials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.

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AN340-EU-EN V1.3 4/13

Description

MeterandSensorDescription

1. Sensorconnectiontothemeter

2. MainLCDdisplaydigits

3. LowerlineLCDdisplaydigits

4. MODEbutton

5. AVG‐MAX‐MINandENTERbutton

6. POWERON‐OFFandSETbutton

7. HOLDanduparrowbutton

8. MEMandRECALLbutton

9. STARTandESCbutton

10. LW‐D‐Aanddownarrowbutton

11. Mini‐Vaneimpeller

12. Temperatureandhumiditysensors

13. Telescopingsensorarm

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Note:Batterycompartment(notshown)islocatedonrearofinstrument

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MeterTopDescription

1. Sensorconnectionjack

2. ACpoweradaptorjack

3. USBPCinterfacejack

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KeypadDescription

POWERON‐OFFandSETbutton

PressmomentarilytopowermeterONorOFF.Pressandholdfortwo(2)secondstoentertheSETUPmode.

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AN340-EU-EN V1.3 4/13

MODEbutton

Momentarypresstostepthroughtheavailablemodes:airvelocity,airvolume,airtemperature,relative

humidity,wetbulbtemperature,dewpointtemperature.

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AVERAGE,MAXIMUM,MINIMUM,andENTERbutton

Presstoviewaverage/minimum/maximumreadings.Alsousedtoconfirm(enter)aselectionwhile

programming.

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START,ESCbutton

Inthenormaloperatingmode,pressandholdfortwo(2)secondstostartorstoptheautomaticdatalogger.

Also,presstoexit(escape)AVG/MIN/MAX,RECALL,andSETUPmodes.

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HOLD,UPARROWbutton

Inthenormalmode,presstofreeze/un‐freezethedisplayedreading.ItisalsousedtomoveUPinamenulist.

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LW‐D‐A(LENGTH/WIDTH‐DIAMETER‐AREA)button

IntheAirVolumemode,pressthisbuttontobeginprogrammingtheAREAvaluefortheductundertest.This

buttonisalsousedtomoveDOWNamenulist.

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MEM‐RECALLbutton

Inthenormalmodeofoperation,pressthisbuttontomanuallyrecordareadingintothemeter’s99location

memory.Pressandholdfortwo(2)secondstorecallandreviewthemanuallyrecordeddataonereadingata

time.



and 

WiththemeterOFF,pressandholdthesetwobuttonstodisablethesleepmode.Sleepmodeswitchesthe

meteroffautomaticallyafteratwenty(20)minuteperiodofinactivity.

and 

WiththemeterOFF,pressandholdthesetwobuttonsuntilPCappearsontheLCD.Themeterisnowreadyto

communicatewithaPC.ForinstructionsontheuseofthePCinterfacepleaserefertotheHELPutilityprovided

onthesuppliedCD‐ROM.



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AN340-EU-EN V1.3 4/13

DisplayIconDescription

MAX‐MIN‐AVGMaximum,Minimum,andAveragereadings

LWLengthandWidth(forrectangularductareameasurements)

DDiameter(forcircularductareameasurements)

AAreaforductmeasurements

Cm2andinch2Squarecentimetersandsquareinchesforareameasurements

oC/FTemperatureunits

TAAirTemperature

RHRelativeHumidity

DPDewpoint

WBTWetbulb

VELVelocity

VOLVolume

HOLDDisplayHOLDfeature

%rhRelativeHumidityunitofmeasure

m/sMeterspersecond

ft/mFeetperminute

CFMCubicfeetperminute

CMMCubicmetersperminute

RECRecord

RECALLRecall

AM/PMMorning/Eveningtime

B LowBattery

8888.8Main(largerandupper)displaydigits

88‐88‐88Timer(lower)displaydigits



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AN340-EU-EN V1.3 4/13

Operation

PowerON‐OFF

1. SwitchthemeterONbypressingthepowerbuttonmomentarily.

2. PressagaintoswitchthemeterOFF.

3. IfthemeterdoesnotswitchON,checkthatthemeterhassix(6)freshAAAbatteries

installedintherearbatterycompartment.Refertothebatteryinstallationsectionfor

details.

4. Themetercanalsobepoweredusingthe9VACpoweradaptor.Thepoweradaptorconnects

tothetopofthemeterusingthejackasshownintheDescriptionsectionofthisguide.

Sleepmode

Themeterwillautomaticallyenterthesleepmode(switchoff)aftertwenty(20)minutesof

inactivity.Todisablethisfeature:withthemeterOFF,pressandholdtheSETandHOLDbuttons

fortwo(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.

Measurements

5. ConnectthesensortothejackatthetopofthemeterasshownintheDescriptionsection.

Thensensorandjackarekeyedtoensureproperconnection.Thesensordiameteris18mm

(0.7”)andthetelescopingwandextends1m(39”).

6. WiththemeterswitchedON,usetheMODEbuttontoadvancefromonemeasurementtype

tothenext(airvelocity,airfloworvolume,airtemperature,relativehumidity,wetbulb

temperature,anddewpointtemperature).Notethatforairvolumemeasurementstheuser

mustfirstentertheareavaluefortheductundertestbeforeaccuratereadingscanbemade.

RefertotheAREAsectionofthisguideforprogrammingdetailsandtotheAppendixfor

additionalinformationonareameasurements,calculations,andunitconversions.

7. Whenmeasuring,airmustenterthevaneonthesideofthesensorwiththeprintedwords

AIRIN.Thesensorwandcanbeextendedusingitstelescopingcapabilityupto1m(39”).

8. Themeasurementisindicatedontheupperdisplaydigitsalongwiththecurrentlyselected

unitofmeasure.Tochangetheunitofmeasure,refertotheSETUPmodesection.Thelower

displaylineshowstherealtimeclock,alternatingtimeanddateinformation.

9. Theairtemperatureandrelativehumiditysensorsarelocatedintheslottedopeningonthe

sensorwandbelowtheimpeller.

10. Airvelocityreadingsareindicatedinmeterspersecond(m/s)orfeetperminute(fpm).

Temperaturereadings(air,dewpoint,orwetbulb)areindicatedin°C/°F.RelativeHumidity

isindicatedin%.Airflow(volume)isindicatedinCFM(cubicfeetperminute)orCMM(cubic

metersperminute).

11. Tomeasurerelative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.

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AN340-EU-EN V1.3 4/13

LCDbacklight

Whenanybuttonispressed,theLCDbacklightingswitchesonfor10secondsandthenswitches

OFFautomatically.

DataHOLD

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

2. The‘HOLD’iconwillappearon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.

AVG‐MAX‐MINMode

TheAVG‐MAX‐MINfeaturerecordsthehighest(MAX),lowest(MIN),andaverage(AVG)

readingsforeasyrecall.ThemeterbeginsrecordingAVG‐MAX‐MINvalueswhentheAVG‐MAX‐

MINmodeisstarted.Thelowerdisplaylineindicatestheelapsedtimeofthesessionin

HH:MM:SS(hours,minutes,andseconds)

1. PresstheAVG/MAX/MINbuttonmomentarily.TheelapsedtimerwillstartandtheMIN

valuewilldisplay.The‘MIN’iconwillswitchONindicatingthatthereadingshownisthe

minimumreadingencounteredsincethemodewasaccessed.

2. PressAVG/MAX/MINagaintodisplaythemaximumreadingencountered.The‘MAX’icon

willappearontheLCDandthereadingdisplayedindicatesthehighestreadingencountered.

3. PressAVG/MAX/MINagaintodisplaytheaverageofallreadingencountered.The‘AVG’icon

willappearontheLCD.

4. PressAVG/MAX/MINagainandthedisplaywillreturntodisplayingrealtimereadings.The

meterwillcontinuemonitoringAVG‐MAX‐MINvaluesforthecurrentsessionandwill

continuetodosountilthesessionisstoppedbytheuser.

5. Tostoptherecordingsession,presstheESCbuttonmomentarily.Theelapsedtime

indicationwillswitchoffandthelowerdisplaydigitswillreturntodisplayingthecurrent

dateandtime(the‘AVG,‘MAX’,and‘MIN’iconswillswitchOFF).

6. NotethatduringanAVG‐MAX‐MINrecordingsession,theMODEbuttoncanbeused,asit

normallyis,tostepthroughthedisplayedmeasurementtypes.

7. AlsonotethattheHOLDandMANUALRECORDmodesofoperationaredisabledduringan

AVG‐MAX‐MINsession.



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AN340-EU-EN V1.3 4/13

99ReadingManualDatalogger

Themetercanrecordupto99readingsmanuallyforon‐screenrecall.

1. PresstheMEM‐RECALLbuttonmomentarilytorecordonereading.Thedisplaywillflash

brieflyandthereadingwillbestoredinthememorylocationindicatedonthedisplay(from

location1uptolocation99).Notethatallreadingstypesarestorednotonlythereading

typecurrentlydisplayed.Forexample,ifairvelocityreadingsaredisplayed,wetbubanddew

pointtemperatureswillalsoberecorded.Date/timestampoftherecordingisalsorecorded.

2. Toreviewthereadings,pressandholdtheMEM‐RECALLbuttonfortwo(2)seconds;the

‘RECALL’iconwillswitchON.Nowusetheupanddownarrowbuttonstoscrollthestored

readings.Thememorylocationwillappearfirstinthemaindisplayareafollowedbythe

reading.Thetimestampfortherecordingisshownonthelower,timerdigits.UsetheMODE

buttontostepthroughtheothermeasurementtypes.

3. PresstheESCbuttonmomentarilytoexittheMEM‐RECALLmode.

4. Thereadingswillremaininmemoryuntiloverwrittenorerasedbytheuser.Toerase

readings,followthestepsprovidedintheSETUPmodesectionofthisguide.

12,000ReadingAutomaticDataloggerandPCInterface

The12,000readingdataloggercanrecordreadingsatarateselectedbytheusedautomatically.

UsetheSETUPmodetoselectthesamplingrate(from1secondupto4hours59minutes59

seconds).LoggedreadingsmustbedownloadedtoaPCusingthesuppliedsoftwareprogramin

orderforthereadingstobereadandanalyzed.

1. PressandholdtheSTART‐ESCbuttonfortwo(2)secondstostartthedatalogger.Readings

willbeloggedatthesamplingrateselectedbytheuserintheSETUPmode.The‘REC’icon

willflashwhilethemeterisautomaticallylogging.

2. Allparameters(velocity,volume,dewpoint,wetbulb,andhumidity)willbelogged

regardlessofwhichparameterisdisplayed.

3. Whilelogging,theupperdisplaydigitsindicatetherealtimereadings;thelowerdisplay

showstherealtimeclock.

4. TostopthedataloggerpressandholdtheSTART‐ESCbuttonagainfortwo(2)seconds.

5. ImportantNote:Ifthedataloggerisstartedagainbeforethedatafromtheprevioussession

isdownloadedtoaPC,alldatafromtheprevioussessionwillbeoverwritten(erased).

6. Duringthedataloggingsession,theMODEbuttoncanbeused,asitnormallyis,toswitchthe

measurementparameter(velocity,volume,dewpoint,etc.).

7. AVG‐MAX‐MIN,manuallogging,andHOLDmodesaredisabledwhilethemeteris

datalogging.

8. Installandrunthesupplieddataloggingsoftwareprogramtotransfertheloggedreadingsto

thePC.ThemeterconnectstothePCviaaUSBcable(meter’sUSBjackislocatedatthetop

ofthemeterasshownintheDescriptionsection).Readthesoftwarehelpguideavailablein

thesoftwareprogramforfullsoftwareoperatinginstructions.

9. WiththemeterOFF,pressandholdtheSETandLWDAbuttonsuntilPCappearsontheLCD.

ThemeterisnowreadytocommunicatewithaPC.ForinstructionsontheuseofthePC

interfacepleaserefertotheHELPutilityprovidedonthesuppliedCD‐ROM.



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AN340-EU-EN V1.3 4/13

AREAprogrammingforAirFlow(Volume)CMM/CFMMeasurements

Toaccuratelymeasurethevolumeofairflowinaduct,theareaoftheductmustfirstbemeasured

andtheresultenteredinthemeterviathebuttonpresssequencesdescribedbelow.Refertothe

Appendixformoreinformationonareameasurements,calculations,andunitconversions.Area

measurementsareenteredassquarecentimetersorsquareinches(cm2orinch2).



Firstdecidethemethodforprogrammingtheareainformationintothemeterandthenproceed.

Thethreemethodsare:



a. LxW:Entertheduct’sLength&Widthmeasurementvaluesincentimetersorinches

(rectangularducts);themeterthencalculatestheareainsquarecentimetersorsquare

inches(cm2orinch2).

b. D:Entertheduct’sDiametervalueincentimetersorinches(forroundducts);themeter

calculatestheareaautomaticallyinsquarecentimetersorsquareinches(cm2orinch2).

c. A:Entertheareavaluedirectlyinsquarecentimetersorsquareinches(cm2orinch2).Seethe

Appendixfortipsonareameasurements,calculations,andunitconversions.



ImportantNote:Areameasurementsmustbeenteredincentimetersorinches.If

measurementsaremadeinmetersorfeetpleaseconverttocentimetersorinches.Seethe

Appendixformoreinformation.



Fromthenormaloperatingmode,usetheMODEbuttontoscrolltotheAirVolumemode.

UsetheLW‐D‐Abuttontoselectthemethod:LW(LENGTHxWIDTHforrectangularducts),D

(DIAMETERforcircularducts),orA(AREA:iftheareavalueisknown).ThedisplayiconsL,D,

andAinformtheuserastowhichmodeisselected.

LENGTHxWIDTH(Area)Mode

Whenthe‘L’isshownatthetopoftheLCD,themeterisreadytoacceptarectangularduct’s

Lengthmeasurementincentimetersorinches.

UsethebuttonONLYtochangethevalueoftheflashingdigit(pressingthedownarrow

willcausethescreentochangefromLengthtoDiameter).UsetheENTERbuttontomove

fromdigittodigit.

Whenfinishedenteringthelength,andwiththeright‐mostdigitflashing,presstheENTER

buttontomovetotheWidth(W)screen.

Whenthe‘W’isshownatthetopoftheLCD,themeterisreadytoaccepttheWidth

measurementincentimetersorinches.

UsethebuttonONLYtochangethevalueoftheflashingdigit(pressingthedownarrow

willcausethescreentochangetoDiametermode).UsetheENTERbuttontomovefrom

digittodigit.

Whenfinishedenteringthewidth,andwiththeright‐mostdigitflashing,presstheENTER

buttontoreturntothemainoperatingmode.

Themeterautomaticallycalculatestheareaoftheductand,whenvolumemeasurements

aretaken,theLCDwillshowaccurateairvolume(flow)inCMM/CFMunits.

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AN340-EU-EN V1.3 4/13

DIAMETER(Area)Mode

Whenthe‘D’isshownatthetopoftheLCD,themeterisreadytoacceptacircularduct’s

Diameterincentimetersorinches.

UsethebuttonONLYtochangethevalueoftheflashingdigit(pressingthedownarrow

willcausethescreentochangefromDiametertoArea).UsetheENTERbuttontomovefrom

digittodigit.

WhenfinishedenteringtheDiameter,andwiththeright‐mostdigitflashing,presstheENTER

buttontoreturntothemainoperatingmode.

Themeterautomaticallycalculatestheareaoftheductand,whenvolumemeasurements

aretaken,theLCDwillshowaccurateairvolume(flow)inCMM/CFMunits.

EnteringtheAREAValueManually

Whenthe‘A’isshownatthetopoftheLCD,themeterisreadytoacceptanAreavalue

directlyinsquarecentimetersorsquareinches(cm2orinch2).Note:UsetheLW‐D‐Abutton

fromtheAirVolumemeasurementmodetoaccessthe‘A’screenifnecessary.

UsethebuttonONLYtochangethevalueoftheflashingdigit(pressingthedownarrow

willcausethescreentochangefromAreatoLength).UsetheENTERbuttontomovefrom

digittodigit.

WhenfinishedenteringtheDiameter,andwiththeright‐mostdigitflashing,presstheENTER

buttontoreturntothemainoperatingmode.

Nowwhenvolumemeasurementsaretaken,theLCDwillshowairvolume(flow)in

CMM/CFMunits.

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