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Invacare IRC5PO2 Oxygen Equipment User Manual

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SECTION 2—INSTALLATION/SEQUENCE OF OPERATION

Part No 1148070 13 Perfecto

2

™

Theelectricalactivationofthe4‐wayValveisaccomplishedevery8to15secondsbythe

pressuresensorandP.C.Boardelectronicswhenthepressurereachesasetpointof21

p.s.i.(144.79kPa)outputflows4L/minandaboveor16p.s.i.(110.32kPa)outputflows3

L/minandbelow.Thetimebetweencyclesisdependentonaltitude,flowrateand

internalenvironmentalfactors.

AP.E.valveopensjustpriortotheshiftofthe4‐wayvalve.Thisallowshighly

concentratedoxygentoenterthejustexhaustedbedfromthetop.Thisadditional

pressureallowsthebedtostartitscycleatahigherpressure.TheP.E.valvewillclosejust

aftertheshiftofthe4‐wayvalve.

Ifmainpowerislost,theBatteryFreePowerLossAlarmwillsoundashortʺBEEPʺ,with

alongpauseafter.Allunitsareequippedwithadiagnosticalarmsystemthatsignalsif

thepneumaticpressureorelectricalsystemsmalfunction.Thetroubleshootingguidein

thismanualexplainsthealarmsystemsignalsandreasons,indetail.Referto

Troubleshooting

onpage 16.

SensO

2

Oxygen Sensor Technology - Ceramic Zirconia

Sensor

Technical Description

Theoxygenbeingproducedbytheconcentratorflowsoutoftheproducttankandinto

theflowmeter.Asmallflowofoxygenproducedbytheunitissentthroughaprecision

orificetotheoxygensensormountedontheprintedcircuitboard.

Astheoxygenentersthesensor,itpassesthroughascreenandcontactsthesensingdisk.

Electriccurrentflowingthroughametalfilmresistorheatsthediskinexcessof300°



C.

Oxygenmoleculescontacttheelectrodeofthediskandpick‐upextraelectronstobecome

oxygenions.Theseoxygenionsareattractedtotheelectrodeonthebottomofthezirconia

sensingdisk.Becauseofthecrystalstructureofthezirconia,onlyoxygenionscanpass

through.Whentheoxygen

ionsreachthebottomelectrode,theextraelectronsare

releasedfromtheoxygenionsandoxygenmoleculesreturntotheair.Thenumberof

electronsisdirectlyrelatedtotheoxygenconcentration.TheelectronstraveltotheP.C.

boardwheretheyarecountedandtheoxygenconcentrationreadingiscalculated.

A

microprocessorontheP.C.boardcontainssoftwarethatinterpretsthesignalbeing

receivedfromthesensor.Itcomparesthesignaltoclinicallyacceptablelimits.Signals

outsideoftheclinicallyacceptablelimitsgenerateresponsesintheformoflights,audible

indicators,and/orsystemshut‐down.

Operating Sequence

Oncethepowerswitchhasbeenturnedon( ),theSensO

2

circuitwillwaitfiveminutes

fortheconcentratortobeginproducingclinicallyacceptableoxygenandtheoxygen

sensortostabilize.TheGREENlightwillilluminate(indicatingnormalsystemoperation)

whiletheoxygensensoriswarmingup.

I/

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