Extech Instruments AN340 User manual

USERGUIDE


Mini‐VaneCMM/CFM
Anemometer/Psychrometer+Datalogger


ModelAN340
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AN340-EU-EN V1.3 4/13
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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.

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.

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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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





Note:Batterycompartment(notshown)islocatedonrearofinstrument

MeterTopDescription
1. Sensorconnectionjack
2. ACpoweradaptorjack
3. USBPCinterfacejack

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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MODEbutton
Momentarypresstostepthroughtheavailablemodes:airvelocity,airvolume,airtemperature,relative
humidity,wetbulbtemperature,dewpointtemperature.

AVERAGE,MAXIMUM,MINIMUM,andENTERbutton
Presstoviewaverage/minimum/maximumreadings.Alsousedtoconfirm(enter)aselectionwhile
programming.

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.

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.

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.

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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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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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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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
8
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
9
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
10
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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