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Parker Hannifin

Hydraulic Filter Division Europe

FDHB500UK.

Specification

AutomaticParticleCounters(APC’s),havebeenwidely

used for many years in condition monitoring of hydraulic

fluids.However,itisonlyrecentlythatAPC’shavebecome

flexibleenoughtoenabletheinstrumentstobetakenoutof

thelaboratoryandusedon-lineinordertoobtainthemost

credibleformofresults.

Unusually,themovefromfixedlaboratoryuse,toportablefield

usehasnotbeenattheexpenseofaccuracyoruserflexibility,

buthasactuallyenabledtheinstrumentstobeusedovera

wider range of applications and situations.

ThemostcommonmonitoringtechniqueusedinAPC’sisthat

oflightobscurationorlightblockage.Here,afocusedlight

sourceisprojectedthroughamovingcolumnofoil,(inwhich

thecontaminantsbeingmeasuredarecontained),causingan

imageofthecontaminanttobeprojectedontoaphotodiode

cell,(changinglightintensitytoanelectricaloutput).

The electrical output of the photo diode cell will vary in

accordance with the size of the particles contained in the

columnofoil;thelargertheparticle,thebiggerthechangein

the photo diode electrical output.

On-lineAPC’smustbeabletotesttheoilsampleatwhatever

cleanlinessitisdeliveredtothemachine.Parkerthereforehad

todeveloptechnologytoensuretheon-lineAPCwasableto

testasamplewithouttheconventionallaboratorytechnique

whichrequiresdilution-apracticethatwouldhavebeen

simplyimpossiblewithaportableunit.

Bycarefuldesignandwindowsizing,gravimetriclevelsas

highas310mgofdirtperlitre,(equivalenttoupto4million

particles>6micronper100ml),canbeachievedwithout

makingtheinstrumentsusceptibletocountersaturation.

Thesehighsaturationpointon-lineAPC’s,whilstlosingnone

oftheaccuracyoftheirlaboratorycounterparts,enable

particlecountingtobecarriedoutquicklyandaccurately.

Core technology that proves itself in icountLaserCM

TheicountLaserCMportableparticlecounterfeatures

microprocessor controlled optical scanning for accurate

contaminantmeasurementwithacalibrationrangefromISO7

to ISO 22 with no counter saturation.

How does icountLaserCM work?

– Theparticlesaremeasuredbyaphotodiodethatconverts

light intensity to a voltage output which is recorded against

time.

– As the particle moves across the window the amount of

light lost is proportional to the size of the particle. This

reduction in voltage is measured and recorded.

– This “voltage” lost relates directly to the area of the particle

measured, is changed into a “positive” voltage and then in

turn changed into a capacitance value.

– This value is counted and stored in the icountLaserCM

computerinoneof6channelsaccordingtoparticlesize.

– Readoutsaredisplayedonthehand-heldLCDinthe

accepted ISO and NAS standards ready for hard copy

printing or RS232 computer download.

– Theon-boardcomputerallowsstorageofupto300

test results.

A focused light source is

projected through a moving

column of oil.

Laser Optical Sensing

Parker Hannifin

HydraulicFilterDivisionEurope

FDHB500UK/icountLCM20

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