Product Manual
OperatingInstructions
EffectsofOtherGases
TheCheckO
2
Plusisdesignedtomeasuretwodifferenttypesof
gasmixtures:
•Oxygen,nitrogenandargonfromoxygenconcentrators
•Pureoxygenduringcalibrationverificationmode
Anyotherconcentrationsorcombinationsofgaseswillcausethe
CheckO
2
Plustomeasureoxygenconcentrationincorrectly.
EffectsofLowFlow
Oxygenconcentratorsfunctionontheprincipleofremovingnitrogen
gasfromair,leavingconcentratedoxygenandargonataspecific
oxygentoargonratio.Thisoperatingprinciplemaybealteredwhen
concentratorsaresettoflowatthelowendoftheiroperational
range.Atlowflowstheymayoutputalowoxygenconcentration,
e.g.85%to91%,forreasonsotherthanhighnitrogen,possiblydue
toanincreaseinargoncontent.TheCheckO
2
Plusrequiresthat
theratioofoxygentoargonremainconstantinordertoguarantee
anaccuracyof+/-1.5%oxygen.
•DONOTusetheCheckO
2
Plustomeasuretheoxygen
concentrationofaconcentratorwhenflowingatrateslower
thanitsoptimalperformanceasspecifiedbytheconcentrator
manufacturer;generally4LPMorlessonconcentratorsthathave
amaximumflowof10LPM,and1LPMorlessonconcentrators
thathaveamaximumflowof5LPM.
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