Extech Instruments AN320 User manual

USERGUIDE



LargeVaneCFM/CMM

Anemometer/Psychrometer+CO







ModelAN320

AN320-en-GB_V1.3 11/15

Introduction

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

+CO

.ThisinstrumentmeasuresAirVelocity,AirFlow(volume),AirTemperature,Relative

Humidity,WetBulbTemperature,DewPointTemperature,andCO

2

(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_V1.3 11/15

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

Unitofmeasuresymbolforupperdisplayrow

9. AirVelocityVane

MeterDescription(rear)

10. Airtemperature,humidity,andCO

sensors

11. Batterycompartment



AN320-en-GB_V1.3 11/15

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).



o Pressmomentarilytofreezethedisplayedreading(HOLDiconswitchesON);press

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

o Press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

o This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(CO

),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_V1.3 11/15

DisplayLayout

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

2. UpperDisplaydigits(airvelocity,humidity,CO

,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_V1.3 11/15

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CO

(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CO

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in

orcm

.

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_V1.3 11/15

RelativeHumidity,WetBulb/DewPointTemperature,andCO

Readings

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

humidity,airtemperature,andCO

.WetBulbandDewPointtemperaturesarecalculatedbased

ontemperatureandhumidityreadings.

1. PressU/modetoscrolltoRH(%)orCO

(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.Themetercanstoreupto19,999pointsinmemory.

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_V1.3 11/15

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.Thelongestamountoftimethemetercan

operateinTimedAverageModeis19,999seconds.

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_V1.3 11/15

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CO

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CO

calibration

mode.

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

4. DuringcalibrationaCO

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_V1.3 11/15

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

o Neverdisposeofbatteriesin

afire.Batteriesmayexplodeorleak.

o Nevermixbatterytypes.Alwaysinstallnewbatteriesofthesametype.

AN320-en-GB_V1.3 11/15

Specifications

AirVelocity Ranges Resolution Accuracy

m/s(meterspersec) 0.2–30m/s 0.01m/s ±(1.5%rdg+0.3m/s)

fpm(feetperminute) 40–5900fpm 1fpm ±(1.5%rdg+59fpm)

RelativeHumidity Range Resolution Accuracy

RH 0.1%‐99.9%RH 0.1RH ±3%RH(10‐90%RH)

±5%RH(<10%or>90%)

AirFlow Ranges Resolution AreaRange

CMM(cubicmeters/min) 0‐99999m

/min

0.1upto9999.9

then1.0

0to99999cm



CFM(cubicft/min) 0‐99999ft

/min

0.1upto9999.9

then1.0

0to99999in



Temperature Ranges Resolution Accuracy

C

AirandWetBulb:

‐20to60

C(‐4to140

F)

DewPoint:

‐5to60

C(23to140

F)

0.1

F)

±0.6°C(‐20to50°C)

±1.2°C(51to60°C)

±1.1°F(‐5to122°F)

±2.2°F(123to140°F)



Range Resolution Accuracy

PPM(partspermillion)

0–9999ppm

(readingsover5000are

notspecified)

1ppm

±(30ppm+5%ofrdg)

from0to5000ppm

AN320-en-GB_V1.3 11/15

Circuit CustomLSImicroprocessor

Display Dualfunction13mm(0.5")4‐digitLCD

Samplingrate 1readingpersecondapprox.

Airvelocity/flowsensor Conventionalangledvanearmswithlow‐frictionballbearing

TemperatureSensor NTC‐typeprecisionthermistors

Sensor NDIRCO

sensor

AutomaticPoweroff Autoshutoffafter20minutestopreservebatterylife(sleepmode)

OperatingTemperature 0°Cto50°C(32°Fto122°F)

StorageTemperature‐10°Cto50°C(14to122

F)

OperatingHumidity <80%RH

StorageHumidity <90%RH

OperatingAltitude 2000m(7000ft.)maximum

BatteryPower Four(4)‘AAA’1.5Vbatteries

BatteryLife >40hours

Batteryconsumption 8.3mADC(approx.)

Weight 725g(1.6lbs.)includingbatteryandprobe

Dimensions Maininstrument:269x106x51mm(10.6x

4.2x2”)



Vaneinnerdiameter:100mm/3.94inches

 OptionalAirFlowAdaptors:

 Round:210mm(8.3”)Diameter

 Square:346x346mm(13.6x13.6”)

AN320-en-GB_V1.3 11/15

ErrorMessages

Errorcodesandsolutions



AirTemperature

E02:Temperaturereadingislowerthanthelowrangelimit.Placethemeterinroom

temperaturefor30minutes.IfE02continues,sendtheunittoExtechforrepair.

E03:Temperatureexceedsthehighrangelimit.Placethemeterinroomtemperaturefor30

minutes.IfE03continuestoappear,

sendtheunittoExtechforrepair.

E31:TheA‐to‐Dconverterrequiresreplacing.SendthemetertoExtechInstrumentsforrepair.



RelativeHumidity(RH)

E04:Temperatureerrorcorruptedthehumidityreading.Checkthetemperatureerrorsolution

section.

E11:RHcalibrationerror.SendtoExtechInstrumentsforrepair.

E33:RHmeasurementcircuiterror.SendtoExtechInstrumentsforrepair.



DewPoint(DP)andWetBulb(WBT)Temperature

E04:TemperatureorRHerror.ChecktemperatureorRHerrorsolutions.



Airvelocity

E03:Velocityexceedsthehighrangelimit.Testthemeterusinganairvelocitythatisknown

tobewithinthespecifiedrangelimits.SendtheunittoExtechforrepairiftheE03error

messagepersists.



Airvolume

E03:Readingexceedsthemeter’sdisplaylimit.CheckthattheAREAsettingiscorrectinthe

SetupMode.

E04:Airvelocityerror.ReturnmetertoExtechforrepair.



CO2

E01/E33:VoltagetooloworCO

moduleerror.Checkifthelowbatteryiconisdisplayedon

theLCD,ifyes,replacewithnewbatteries.Tryarecalibration,orsendtheunittoExtechfor

repairiftheproblempersists.



OtherErrors

E32:MemoryICerror.Rebootthemeterandcheckitagain;sendittoExtechInstrumentsfor

repairiftheerrormessagepersists.

Nodisplay

1. Checkthatthebatteriesaremakinggoodcontactandarealignedforcorrectpolarity.

2. Replacebatteries.

DisplayswitchesOFFautomatically

Thissymptomcouldbethenormal‘SleepMode’whichswitchesthemeterOFFafter20

minutesofin‐activity.Ifthisisnotthe‘SleepMode’,checkwhetherthelowbatteryindicator

appearsbeforetheLCDattemptstoswitchON;ifyes,replacethebatteries.



AN320-en-GB_V1.3 11/15

Appendix:UsefulEquationsandConversions

Areaequationforrectangularorsquareducts





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Areaequationforcircularducts

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Cubicequations

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NOTE:Measurementsmadeininchesorcentimetersmustbeconvertedtofeetormetersbeforeusingtheseformulae.

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UnitofMeasureConversionTable

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 m/s ft/min knots km/h MPH

1m/s 1 196.87 1.944 3.6 2.24

1ft/min 0.00508 1 0.00987 0.01829 0.01138

1knot 0.5144 101.27 1 1.8519 1.1523

1km/h 0.2778 54.69 0.54 1 0.6222

1MPH 0.4464 87.89 0.8679 1.6071 1

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www.extech.com 

Width(W)

Height(H) Area(A)=Width(W)xHeight(H)

CFM(ft

/min)=AirVelocity(ft/min)xArea(ft

)

CMM(m

/min)=AirVelocity(m/sec)xArea(m

)x60

Radius

Area(A)=pi xr

Wherepi=3.14andr

=radiusxradius

Extech Instruments AN320 User manual

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