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Teledyne Advanced Pollution Instrumentation Model 633 Aethalometer
®
Black Carbon Monitor User Manual
07645A DCN6170 17
FLOWMETERS
Twoflowmetersmeasuretheairflowindifferentpointsinthesystem.Oneofthemisused
alsointheairflowregulationloop.
SOLENOIDVALVES
Threesolenoidvalvesareusedtoswitchtheairflowthroughdifferentairflowpathswhenthe
instrumentissetindifferentoperatingmodeslikemeasure,tapeadvanceorsimilar.
CHAMBERLIFTMECHANISM
Thechamberliftmechanismallowsthemeasurementchambertobe lifted manually or
electromechanically.Duringtapeadvancetheautomated chamberlift procedureis invoked.
During tape replacement the manual chamber lift procedure can be engaged. The manual
chamberliftmechanismfeaturesalsoaspeciallockingmechanismwhichsimplifiesthetape
replacementorchambercleaningprocedure.Themainelectroniccomponentsofthechamber
liftmechanismarethesteppermotorandthechamberliftpositionsensor.
TAPEADVANCEMECHANISM
The advancemechanism allowsthe instrument toperform automatic tapeadvances during
measurements.Themainelectronicpartsofthetapeadvancemechanismareasteppermotor
andthetwotapesensors.
ROLLONandUNROLLTAPESPOOLS
Theroll‐onandtheun‐rolltapespoolsholdthemeasurementtape.Duringautomatedtape
advancethetapeunrollsfromtheun‐rollspoolandrollsontheroll‐onspool.Iftheun‐roll
spoolisempty,theeventisdetectedautomaticallythankstothetapesensors.Thetape
replacementproceduremustbeperformedmanuallybytheoperator.Themeasurementtape
isoneofthemainpartsofthesystem.
TAPESENSORS
Thetwotapesensorsareusedbytheinstrumentsoftwaretodetecttheamountoftapeonthe
un‐rollandroll‐onspools.