
4.PROCESSDESCRIPTION
TheElgastatOption4 processlinksfourpurificationtechnologies- reverseosmosis,
adsorption,deionisationandphotooxidation-andincorporatesaninternalrecirculationpump
tomaintainthequalityofpurifiedwaterproducedbytheunit,seeFig2.
Theunitisdesignedtobeoperatedona potablewatersupply,andproduceseither4 or8
litresperhourofpurifiedwaterofbetterqualitythanwaterproducedbydistillation.A
continuoussupplyofpurifiedwaterisproducedbytheOption4 unitandiscollectedand
storedinatreatedwaterstoragetank.Theinternalrecirculationpumpthendrawsthepurified
waterfromthestoragetankandcontinuallyrecirculatesthecontentsofthetankbackthrough
theOption4 unittomaintainthewateratitshighestquality.Theoperationoftheunitisfully
automatedbyuseoflevelcontrolswitcheswithinthetreatedwaterstoragetank.
ThefaciapaneloftheOption4unitisshowninfigure3 anddisplaysthesystemstatus(water
quality)Power,ProcessandStandbylights.Innormalusewiththewaterandelectrical
suppliesconnectedtotheunitthePOWERlightandsystemstatusindicatorswillbeilluminated.
DepressingthePROCESSbutton(seefig3)willstarttheunit(PROCESSlightwillilluminate)
andwillopentheinletsolenoidvalve.InletwaterrequirementsfortheOption4 ispotable
waterbetween2 to6 bar(30to90psi).Waterwillentertheunitthroughtheinletsolenoid
valvethenpassthroughtheLC101PretreatmentCartridgepriortoenteringthedisinfection
portandtheReverseOsmosis(RO)cartridge,thePretreatmentcartridgewillremove
particulatesandanyfreechlorinewhichispresentinthefeedwater.
Thereverseosmosismodulesplitstheflowintotwostreams,permeate(the.purifiedwater)
andconcentrate(thewatercontainingmostoftheimpurities).Theconcentrateftowisrestricted
toenablea continuousbackpressureonthereverseosmosismoduleand'leavestheunitvia
thedrainconnectionontherighthandsideoftheunit.Thisdrainflowshouldneverberestricted
furtherotherwisescalingontheROmembranewilloccur,itshouldbedirectedtoa convenient
drainagepoint.
Thepermeate(purifiedwater)isthencollectedinthestoragetank.Waterisdrawnbackinto
theOption4 unitbyitsinternalrecirculationpumpandisfurtherpurifiedbypassingthrough
aDlcartridgepack(LC117)whichremovesdissolvedionicandorganicimpuritiesfromthe
permeatewater.Theresistivityofthepurifiedwaterleavingthecartridgepackiscontinuously
monitoredandisdisplayedonthesystemstatussectionofthefaciapanel.Watergood
indicatesthatthewaterbeingproducedbytheunitisabove5MD-cm,ifthechangecartridge
lightilluminates,thisindicatesthatthequalityisbelow5MflcmandthattheDlcartridgepack
requiresreplacing.
Thepurifiedwaterthenpassesthrougha UVlightchamberwhichirradiatesthewaterwith
shortwavelengthUVlighttodestroyanymicro-organismspresent.Thefullytreatedwater
canbedispensedthroughthedispensevalve.Forcriticalapplicationsa 0.2^/mpointMuse
filtermaybefittedtothevalveforfinalprotection.Anywaternotdrawnofffromthedispense
valveisautomaticallyreturnedtothestoragetankforfurtherrecirculationandpurification.
Thetreatedwaterstoragetankmustbefittedwithlevelcontrolswitchestocontrolthema&e
upflowviatheROcartridgesandlowlevelprotectionfortherecirculationpumpSedation5
refers.
Ifallthepurifiedwaterisdrawnfromthestoragetankthelowlevelwillactivateandthestandby
lightonthefaciapanelwillilluminate,thiswillswitchtherecirculationpumpandUV<%The
inletsolenoidvalvewillremainopentorefillthetankandoncethereissufficientwater^nthe.
tanktheProcessbuttoncanbepressedtoclearthestandbyconditionandthenreprfssei
tostarttherecirculationpumpandUV.
ForfulltechnicalspecificationoftheOption4 unitseeSection3.
Opt4 Issue2-05/93