
9
LoggingData
OncetheGasLab®softwarehasbeeninstalledandthemeterisconnectedtothecomputer,youcan
gatherdatainavarietyofways.Dependingonthetypeofmeter,datacanbecollectedinrealtime,
datalogscanbedownloadedfromthemeter’smemory(ifequipped),andsavedtothecomputer,
anddatacanbereviewedonthemeter’sLCDdisplay(ifequipped).
Foreachloggingsession
1. TurnthemeterON.
2. Themetermustbestartedatleast1minutepriortodeploymentanddataloggingtoallow
theCO2sensortimetowarm‐upandcalibrate.
3. Setthelogginginterval(min30sec)asdesiredandcommencelogging.
4. Whendataloggingiscompleted,turnthemeterOFF.
SettingtheLoggingInterval
Tochangethedefaultsettings,connectthemetertoacomputerusingtheincludedUSBcable.Select
thedesiredmeter,andchangethesettings.
NOTE:RefertotheGasLab®User’sManualforcompleteinstructions.
DisplayandAlarm(CM‐0016,CM‐0017only)
Thisdataloggingmeterincludesabuilt‐inaudible(80dB)alarmandanLCD(LiquidCrystal
Display)displaythatprovidesvisualindicationofthecurrentCO2levelbychangingcolortogreen,
yelloworred,dependingonCO2levelrangesselected.Thedisplaywillchangecolorsdependingon
theactualCO2levelreadingsbysettingthe“Green”,“Yellow”,and“Red”ranges.
ThealarmissetperLEEDIAQlevelsbydefaultbutcanbeprogrammedtootherstandardssuchas
OSHAlevelsusingtheGasLab®software.Thenewalarmlevelwillbemaintainedinthemeter’s
memory.
Duringoperation,whenthemeteristurnedon,andwhenthehighconcentrationCO2level
programmedisreached,an80dBalarmwillsound.Thealarmcanbemutedfor30secondsby
pressingthebuttononthefrontofthemeter.ThisfeaturecanbechangedinGasLab®.
Calibration
TheCO2sensor,inIAQapplicationsonly,usesanalgorithmcalledAutomaticBackground
Calibration(ABC)toensuremaximumaccuracybycontinuouslyadjustingthezero‐point.
TheABCalgorithmallowstheCO2sensortodynamicallyshiftitsCO2readingbyaconstant.It
worksviastoringthelowestCO2sampletakenovertheABCPeriodandassumingthatthislow
valueisequaltoaknownvalue(thetargetvalue).ItthenadjuststheoutputoftheCO2readingby
thedeltabetweenthesevalues.Thisalgorithmdoesnotaffectthelinearizationoftheoutputsignal.
Forexample,bydefaultABCisenabledwithanABCPeriodof180hours,atargetvalueof400ppm,
andamaximumdeltaof30ppm.Thisoperatesundertheprinciplethatambient,outdoorairisat
400ppm.