Extech Instruments AN320 Manual

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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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.