User manual

AN320-EU-EN V1.0 1/13
6
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
2
(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
2
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
2
orcm
2
.
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. Optionally,measureAirVolumewithanairflowcone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theadaptorandthe‘INSERT
ConeShape’promptwillappearontheLCD(theadaptoriconwillalsoappear).Selectround 
orsquareusingthemeter’s
keypad.Notethat,regardlessoftheAREAsettinginthe SETUP
mode,themeterwilldefaulttothedimensionsoftheattachment(Square:356x346mm
[13.6x13.6”);Round:210mm[8.3”]diameter).NOTE: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.