Omega LVP-51-R User manual

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INTRODUCTIONStepOne
AboutNon‐IntrusiveRFCapacitanceTechnology:OMEGAENGINEERING'sLVP‐51‐Rlevelswitchgeneratesa
highradiofrequencysignalfromthecapacitanceelectrodeonthetanksideofeachsensor.Dependingonthe
thicknessofthetankwallandthematerialofwhichitismade,thereisaparticularminimumdielectricvalue
theelectrodemeasureswhenthereisnoliquidontheothersideofthetankwallfromthesensor.Whenliquid
isontheothersideofthewall,thedielectricvaluerises.
Aspartofinstallation,atwo‐stepcalibrationprocedureensuresthatthethresholdbetweenwetanddryisset
attheidealpointforyourparticulartankandapplicationfluid,withouttheuseofanyexternaltest
equipment.Thesensor’soperationandpointofactuationmayvarybasedonthedielectricpropertiesof
variousapplicationliquids,tankmaterialsandthicknesses.TheLVP‐51‐Rsensorisintendedtobeusedwith
liquidswithadielectricvaluebetween20and80.Duetoitsusercalibrationcapabilityitmaybeabletodetect
liquidsbelowadielectricconstantof20undercertainconditions,butthismustbeverifiedby
experimentation.
TableofContents
Specifications&Dimensions:.................................................................................................................................4
SafetyPrecautions:................................................................................................................................................5
MakeaFail‐SafeSystem:...........................................................................................................................6
Components:..............................................................................................................................................6
Installation:............................................................................................................................................................7
AttachfittingtoTank:................................................................................................................................7
MountSensorinFitting:............................................................................................................................7
Electrical:................................................................................................................................................................8
SignalOutput(currentsensing):................................................................................................................8
SignalOutput(relayswitching):.................................................................................................................9
Wiring:..................................................................................................................................................................10
WiringtoaOMEGAENGINEERINGController:........................................................................................10
SwitchingInductiveLoads:.......................................................................................................................10
WiringtheRelayOutput:.........................................................................................................................11
WiringasaP‐ChannelorN‐ChannelOutput:..........................................................................................12
Calibration:...........................................................................................................................................................13
Maintenance:.......................................................................................................................................................14
CheckingPointofActuation:...................................................................................................................................14
TestingtheSensor:..................................................................................................................................................14
Maintenance:..........................................................................................................................................................14
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4
SPECIFICATIONS&DIMENSIONSStepTwo
Specifications:
Tankmounting: Non‐intrusive
Tankmat.comp.: Non‐metallic
Tankwallthick.: <1"(25mm)
Accuracy: ±1mminwater
Repeatability: ±0.5mminwater
Dielectricrange: >20constants
Conductiverange: >100µS/cm
Supplyvoltage: 12‐36VDC
Consumption: 25mAmaximum
Contacttype: (1)SPSTrelay
Contactrating: 60VA,1Amaximum
Contactoutput: SelectableNO/NC
Processtemp.: F:‐40°to176°
C:‐40°to80°
Enclosurerating: NEMA4X(IP65)
Enclosuremat.: PSO
Conduitentrance: Single,1/2"NPT
Bracketmaterial: LVP‐92:PP
LVP‐91:PE
Bracketmounting: 3Madhesive/plasticthermal
weld
Cablejacketmat.: PP
Cabletype: 4‐conductor,#22AWG
(shielded)
Cablelength: Standard:10'(3m)
Classification: Generalpurpose
CEcompliance: EN61326EMC
EN61010‐1safety
Dimensions(shownwithLVP‐91bracket):
DeratingCharts:
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SAFETYPRECAUTIONStepThree
AboutManual:PLEASEREADTHEENTIREMANUALPRIORTOINSTALLINGORUSINGTHISPRODUCT.This
manualincludesinformationonallmodelsofOMEGAENGINEERINGNon‐IntrusiveRFCapacitanceLevel
Switch:LVP‐51‐R.Pleaserefertothepartnumberlocatedonthesensorlabeltoverifytheexactmodelwhich
youhavepurchased.
User’sResponsibilityforSafety:OMEGAENGINEERINGmanufacturesawiderangeofliquidlevelswitches
andtechnologies.Whileeachofthetheseswitchesaredesignedtooperateinawidevarietyofapplications,
itistheuser’sresponsibilitytoselectaswitchmodelthatisappropriatefortheapplication,installitproperly,
performtestsoftheinstalledsystem,andmaintainallcomponents.Thefailuretodosocouldresultin
propertydamageorseriousinjury.
ProperInstallationandHandling:Becausethisisanelectricallyoperateddevice,onlyproperlytrained
staffshouldinstalland/orrepairthisproduct.Theadhesiveonthefittingisfortemporaryinstallationonly.
Forpermanentinstallation,thefittingforthesensorshouldbewelded,glassedorstrappedtothetankitself
usingapprovedplasticweldingtechniques.DonotinstalltheLVP‐51‐Rsensoronametaltank,orwithin6"of
anymetalpipeorfitting.
MountingBracket:TheLVP‐51‐RsensormaybemountedinthePE(LVP‐91)orPP(LVP‐92)bracket.Make
surethatthefittingiscompatiblewiththetankitwillbeappliedto.
MaterialCompatibility:Thesensoritselfisnotdesignedtobeimmersed.Itshouldbemountedinsucha
waythatitdoesnotnormallycomeintocontactwithfluid.ItscaseismadeoutofPolysulfone(PSO).Referto
anindustryreferencesuchastheCompassCorrosionGuidetoensurethatcompoundsthatmaysplashonto
thecontrollerhousingwillnotdamageit.Suchdamageisnotcoveredbythewarranty.
WiringandElectrical:ThesupplyvoltageusedtopowertheLVP‐51‐Rsensorshouldneverexceeda
maximumof36voltsDC.Electricalwiringofthesensorshouldbeperformedinaccordancewithallapplicable
national,state,andlocalcodes.
Flammable,ExplosiveandHazardousApplications:TheLVP‐51‐Rswitchisnotratedforuseinhazardous
locations.RefertotheNationalElectricCode(NEC)forallapplicableinstallationrequirementsinhazardous
locations.DONOTUSETHELVP‐51‐RGENERALPURPOSESWITCHINHAZARDOUSLOCATIONS.
Warning 
Theratingfortherelayis60VA.
DonotinstalltheLVP‐51‐Rlevelswitchonametallictank,orwithin6"ofanymetallicobject.Metalwill
adverselyaffectthedielectricsensitivityofthesensor.
OMEGAENGINEERING'sLVP‐51‐Rsensorsarenotrecommendedforusewithelectricallycharged
applicationliquids.Formostreliableoperation,theliquidbeingmeasuredmayneedtobeelectrically
grounded.
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6
SAFETYPRECAUTION(capacitance)StepThree
MakeaFail‐SafeSystem:Designafail‐safesystemthataccommodatesthepossibilityofswitchand/orpower
failure.OMEGAENGINEERINGrecommendstheuseofredundantbackupsystemsandalarmsinadditionto
theprimarysystem.Addingaredundanthighlevelfloatswitchtothesystemisacosteffectivemeansto
preventcostlytankoverflows.
TheLVP‐51‐Rswitchhasasinglerelay.Thenormallyopen(NO)ornormallyclosed(NC)operationisuser
selectedbasedonthedesiredsystemcontrol.Alwaysdesignafail‐safesystemthataccommodatesforthe
possibilityoffunctionaland/orpowerfailuretotheinstrument.The"normal"relaystateiswheretherelay
coilisde‐energizedandtherelayindicatorisOFF.Therefore,ifpoweriscutOFFtotheswitchitwillde‐
energizetherelay.Makesurethatthede‐energizedstateisthesafestateinyoursystemdesign.Assuch,if
switchpowerislost,apumpwillturnOFFifitisconnectedtothenormallyopensideoftherelay.
Technology:Thenon‐intrusiveRFcapacitanceswitchdetectsthepresenceofliquidorairbymeasuringthe
conductiveordielectricvalueswhicharepresentinallmaterials.Anelectricalcapacitorisformedbetween
thelevelswitchandtheoutertankwall.Asliquidrisesandfallsagainsttheinnerwall,thecapacitanceeffectis
greatlyincreasedandthe60VASPSTrelaychangesstate.
Thesensor’soperationmayvarybasedonthedielectricpropertiesofvariousapplicationliquids.Liquids
withadielectricconstantlessthan20maynotbedetectedbyanLVP‐51‐Rsensor.
TableofCommonDielectricConstants:NOTE:Liquidswithaconductivityvalue>100µS/cmarefineif
coatingisnotanissue.Liquidswithadielectricconstantlessthan20willnotbedetectedbyanLVP‐51‐Rlevel
switch,dependingonconditions.
Acetone .....................21
Acetoaldehyde .......22.2
Acetyl methyl hexyl
ketone ........................28
Alcohol ........... 16 to 31
Ammonia ........ 15 to 25
Acetic acid .... 4.1 to 6.2
Butyl chloride ..........9.6
Barium chloride 9 to 11
Benzene ...................2.3
Benzine ....................2.3
Barium nitrate ..........5.6
Bromine ...................3.1
Chlorobenzene . 4.7 to 6
Chlorotoluene ..........4.7
Chloroform ....4.5 to 5.0
Chlorine, liquid .......2.0
Carbon tetrachloride 2.2
Cyan ........................2.6
Cyclohexane methanol
..................................3.7
D.I. Water .................20
Ethyl toluene ...........2.2
Ethyl alcohol ............23
Ethylene glycol ........37
Ethylene oxide ..........14
Ethylene dichloride
..........................11 to 17
Ethylene chloride .. 10.5
Ethyl acetate ............ 6.4
Ethyl salicylate ........ 8.6
Ethyl stearate .......... 2.9
Ethyl silicote ........... 4.1
Formic acid .............. 59
Ferric oleate ............ 2.6
Freon ....................... 2.2
Glycerine .................. 47
Glycol ....................... 30
Glycol nitrite ............ 27
Gasoline ...........2 to 2.2
Hydrochloric acid ... 4.6
Isobutyric acid ........ 2.7
Isobutyl methyl ketone
...................................13
Jet fuel .....................1.7
Lead carbonate .........18
Lead nitrate ...............38
Methyl salicylate .....9.0
Methanol ...................33
Methyl alcohol .33 to 38
Margarine, liquid
........................2.8 to 3.2
Methyl acetate .........7.3
N-butyl formate .......2.4
Nitrobenzene ...26 to 35
Nitrotoluene .............25
Naphthalene ..2.3 to 2.5
Oils, vegetable 2.5 to 3.5
Oils, mineral ..2.3 to 2.4
Oils, petroleum
........................1.8 to 2.2
Oleic acid ................2.5
Propane, liquid
........................1.8 to 1.9
Potassium nitrate
........................5.0 to 5.9
Potassium chloride ..5.0
Stearic acid ..............2.3
Toluene ....................2.4
Trichloroethylene .... 3.4
Trichloroacetic acid 4.5
Terephthalic acid
........................1.5 to 1.7
Thinner .................... 3.7
Urea ......................... 3.5
Vinyl chloride .. 2.8 to 6
Vinyl alcohol 1.8 to 2.0
Water, 20°C ............. 80
Water, 100°C ........... 48
Components:TheLVP‐51‐Risofferedinthreedifferentmodels.Dependingonthemodelpurchased,youmay
ormaynothavebeenshippedallthecomponentsshownbelow.
LVP‐51‐R
oLVP‐51‐R–PSObodywithPPcable
QuickStartGuide
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7
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INSTALLATION StepFour
OMEGAENGINEERING'sLVP‐51‐RlevelswitchmaybeinstalledanywhereonatankwallusingthePE(LVP‐91)
orPP(LVP‐92)bracketthattheswitchslidesinto.Thebracketcomeswithadhesiveonthetanksidethatis
sufficienttoholdthesensorinpositiontemporarilywhiletheinstallationistested,butforpermanent
installationthebracketmustbewelded,glassedorstrappedtothetank.Extrabracketsareavailablefrom
OMEGAENGINEERING,sothatthelevelswitchmaybemovedtodifferentlocationsonthetankbyslidingit
intootherbrackets.
Attachthebrackettothetank:
1. DeterminewhetherthetankisPPorPE.Theslide‐infittingshippedwiththesensorisdeterminedby
thepartnumber.Ifnecessary,obtainanadditional
bracket.
2. Determinethemountinglocationforthelevelswitch.The
pointofactuation(wherethesensorwillsenda“wet”
signal)ismostoftenatthecenterofthesensor;however
theactualPointofActuation(POA)maydifferdepending
ontheapplicationliquidandtankwallcharacteristics.
Afterpositioningthefittingtocheckclearances,etc.,
removethepaperprotectivestripsfromtheadhesiveof
thebracket.
3. Pressthebracketintoplace.Theadhesiveprovidesaseal
betweenthesensorandthetankwall,andwillholditin
placeduringtestingandinstallation.Ifdesired,thesensormaybeinstalledtemporarilywithout
weldingthefittingtothewall.Ifseveraldifferentlocationsmustbetriedbeforepermanent
installation,usedouble‐sidedfoamsticktapedesignedforPPorPE.
4. AfterthesensorhasbeentestedtoverifythePOA,weld,glassorstrapthebrackettothetankusing
standardindustrialplastictechniques.
Specialnoteforsmallroundtanks:Thebracketmaybeattachedtosmall,roundtanks,aslongasthe
majorityofthebracketisfirmlyattachedtothewall.However,extremeinstallationsmayaffecttheswitches
performance.
Mountthesensorinthebracket:
1. Slidethesensorintothebracket.
2. Aftertrimmingthesensorwiretolengthifneededbytheinstallation,threadthesensorwireintoa
plasticflexibleconduitwitha1/2"malefitting.Screwtheconduitintothesensor,beingcarefulnotto
crossthethreads.Donotovertightentheconduitinthesensorasthismaybreakthefitting.Such
damageisnotcoveredbythewarranty.Takecarewhilepullingthewirethroughconduitthatno
excessivetensionisplacedonthesensorendofthewire,sothatthewireisnotbrokenfromthe
sensorhousing.
3. Connectthesensorwiretothecontrollerfollowingtheinstructionsinitsmanual.Seethefollowing
WiringSectionfordetailedwiringinstructions.

8
ELECTRICALStepFive
SupplyVoltage:ThesupplyvoltagetotheLVP‐51‐Rlevelswitchshouldneverexceedamaximumof36VDC.
OMEGAENGINEERINGcontrollershaveabuilt‐in13.5VDCpowersupplywhichprovidespowertoallof
OMEGAENGINEERING’selectricallypoweredsensors.Alternativecontrollersandpowersupplies,witha
minimumoutputof12VDCuptoamaximumoutputof36VDC,mayalsobeusedwiththelevelswitch.
RequiredCableLength:Determinethelengthofcablerequiredbetweenthelevelswitchanditspointof
termination.Allowenoughslacktoensuretheeasyinstallation,removaland/ormaintenanceofthesensor.
Thecablelengthmaybeextendeduptoamaximumof1000feet,usingawell‐insulated,14to20gauge
shieldedfourconductorcable.
WireStripping:Usinga10gaugewirestripper,carefullyremovetheouterlayerofinsulationfromthelast1‐
1/4"ofthesensor'scable.Unwrapanddiscardtheexposedfoilshieldfromaroundthesignalwires,leaving
thedrainwireattachedifdesired.Witha20gaugewirestripper,removethelast1/4"ofthecolored
insulationfromthesignalwires.
SignalOutputs(Currentsensing):ThestandardmethodusedbyOMEGAENGINEERINGcontrollers;this
technologyusesonlytwowires(RedandBlack).Thesensordraws5mAwhenitisdryand19mAwhenwet.
NC/NOstatusmustbesetbythecontroller.TheWhiteandGreenwiresarenotused.




9

ELECTRICAL(continued)StepFive
SignalOutput(Relayswitching):Allowsthesensortoswitchasmallloadonoroffdirectly,usinganinternal
1Arelay(60VAC/60VDC).Allmodels,LVP‐51‐Rusestherelayandfeatures4wires(red,black,whiteand
green)andashieldwire.TheNO/NCstatusissetbythepolarityo–fthevoltagefeedingtheredandblack
wires.ThegreenwireisthecommonfortherelayandthewhitewireistheNOorNC,dependingonthe
polarityofredandblack.
NormallyOpenWiring:


NormallyClosedWiring:




10
WIRING StepSix
WiringtoaOMEGAENGINEERINGController
LVCN‐120SeriesController(4or20mAoutput):
LVCN‐120Shown

SwitchingInductiveLoads:Theuseofsuppressors(snubbers)isstronglyrecommendedwhenswitching
inductiveloadstopreventdisruptingthemicroprocessor’soperation.Thesuppressorsalsoprolongthelifeof
therelaycontacts.SuppressioncanbeobtainedwithacatchdiodeforDCcircuitsandaresistor‐capacitor(RC)
forACcircuits.

CatchDiode
Alwaysusestepperrelaysbetweenthesensorandexternalloads.
ForDCcircuitsuseacatchdiodesuchas1N4148,shownonleft.

RefertothefollowingcircuitsforRCnetworkassemblyandinstallation:

ChooseRandCasfollows:
R:0.5to1Ohmsforeachvoltacrossthecontacts
C:0.5to1μFforeachampthroughclosedcontacts
Notes:
1. Usecapacitorsratedfor250VAC.
2. RCnetworksmayaffectloadreleasetimeofsolenoidloads.Check
toconfirmproperoperation.
3. InstalltheRCnetworkatthemetersrelayscrewterminals.AnRC
networkmayalsobeinstalledacrosstheload.Experimentforbest
results.



11

WIRING(continued)StepSix
WiringtheRelayOutput:TheLVP‐51‐Rrequires12‐36VDCpowertooperatethesensorandswitchthe
relay.AllillustrationsbelowidentifyaDryswitchstateasthenormalpositionoftherelay.
SwitchingaNormallyOpenDCLoad:
TheRedwireconnectstoPositive(+)ofthepower
supplyandtheBlackwireconnectstoNegative(‐).
TheLOADcanbeattachedtoeithertheGreenor
Whitewires.Completethecircuitbyconnectingthe
Greento(+)VDCpowerorWhiteto(‐)VDCpower
(seeillustrationbelow).
SwitchingaNormallyClosedDCLoad:
TheBlackwireconnectstoPositive(+)ofthepower
supplyandtheRedwireconnectstoNegative(‐).The
LOADcanbeattachedtoeithertheGreenorWhite
wires.CompletethecircuitbyconnectingtheGreen
to(+)VDCpowerorWhiteto(‐)VDCpower(see
illustrationbelow).

SensorPower
[RED&BLKwires]/36VDCMax.
5±1mADry/20±1mAWet
RelayRating
[GRN&WHTwires]/60VA

SwitchingaNormallyOpenACLoad:
TheRedwireconnectstoPositive(+)oftheDC
powersupplyandtheBlackwireconnectsto
Negative(‐).TheLOADcanbeattachedtothe
GreenwireandtheHotoftheVACpower.Connect
theWhitetotheNeutraloftheVACpower(see
illustrationbelow).
SwitchingaNormallyClosedACLoad:
TheBlackwireconnectstoPositive(+)oftheDCpower
supplyandtheRedwireconnectstoNegative(‐).The
LOADcanbeattachedtotheGreenwireandtheHotof
theVACpower.ConnecttheWhitetotheNeutralof
theVACpower(seeillustrationbelow).
SensorPower
[RED&BLKwires]/36VDCMax.
5±1mADry/20±1mAWet
RelayRating
[GRN&WHTwires]/60VA



12
WIRING(continued)StepSix
WiringasaP‐ChannelorN‐Channeloutput:TheLVP‐51‐RcanbesubstitutedforeitheraP‐Channel(PNP,
sourcing)outputoranN‐Channel(NPN,sinking)output.
NormallyOpenDCLoadasaP‐ChannelOutput:
TheRedwireconnectstoPositive(+)ofthepower
supplyandtheBlackwireconnectstoNegative(‐).
TheGreenwireisjumpedtotheRedwirewhilethe
WhitewireisconnectedtotheLOAD.Jumperthe
LOADtotheNegative(‐)tocompletethecircuit.
NormallyClosedDCLoadasaP‐ChannelOutput:
TheBlackwireconnectstoPositive(+)ofthepower
supplyandtheRedwireconnectstoNegative(‐).The
GreenwireisjumpedtotheBlackwirewhilethe
WhitewireisconnectedtotheLOAD.Jumperthe
LOADtotheNegative(‐)tocompletethecircuit.

SensorPower
[RED&BLKwires]/36VDCMax.
5±1mADry/20±1mAWet
RelayRating
[GRN&WHTwires]/60VA

NormallyOpenDCLoadasaN‐ChannelOutput:
TheRedwireconnectstoPositive(+)ofthepower
supplyandtheBlackwireconnectstoNegative(‐).
TheWhitewireisjumpedtotheBlackwirewhilethe
GreenwireisconnectedtotheLOAD.Jumperthe
LOADtothePositive(+)tocompletethecircuit.
NormallyClosedDCLoadasaN‐ChannelOutput:
TheBlackwireconnectstoPositive(+)ofthepower
supplyandtheRedwireconnectstoNegative(‐).The
WhitewireisjumpedtotheRedwirewhiletheWhite
wireisconnectedtotheLOAD.JumpertheLOADto
thePositive(+)tocompletethecircuit.

SensorPower
[RED&BLKwires]/36VDCMax.
5±1mADry/20±1mAWet
RelayRating
[GRN&WHTwires]/60VA


13

CALIBRATION StepSeven
Afteritisinstalledinplace,themustbecalibratedbytheuserbeforeoperation.Everythingneededforthe
procedureisself‐containedwithintheelectronicsoftheLVP‐51‐Rlevelswitch.Twodielectricstates—full
conditionandemptycondition—aremeasuredbytheLVP‐51‐R,andthenaveragedtosetthethreshold
between“wet”and“dry”atthesensor.Theemptystatemustbeatleast6"belowthebottomofthesensor
forcalibration.Thefullstatemustbetothetopofthesensor(notjusttothepointofactuation)for
calibration.Theactualapplicationfluidatitsintendedoperatingtemperaturemustbeusedduring
calibration.Usethefollowingprocedureassumesthatthesensorhasalreadybeenwiredtoapowersupply.
1. Removethecapfromthesensorbodybylooseningthetwoscrewslocatedbelowthesensor.Donot
removethescrewsfromthesensor.Insertasmallscrewdriverintothesmallslotattheedgeofthecap
andgentlypryupwards.
2. Lookingdownyouwillseeasmallthree‐positionswitchandtwotrimpotsmarkedFullandEmpty.You
maystartwithwhateverstatethetankisin.
3. Fullstate:Withthetankfilledtothetopofthesensor,set
theswitchtotheFullposition(right).Makesureyourhands
oranyotherobjectsarenottouchingthesensorwhile
calibratingbecausethiswillcauseafalsereading.Usinga
smallnonmetallicscrewdriveroralignmenttool,turntrim
potFulluntiltheLEDjustlights,andnofarther.Notethe
position.NowturnthetrimpotbackuntiltheLEDturnsoff.
Theidealsettingforthetrimpotismidwaybetweenthese
onandoffpoints.
4. Emptystate:Withthetankdrainedtoapointnocloserthan6inchesbelowthebottomofthesensor,
settheswitchtotheEmptyposition(left).SettheEmptytrimpotasinStep3.
5. Aftercompletingcalibration,makesuretoreturntheswitchtothecenterposition.Snapthecapback
onbypressingdown,andtightenthetwoscrews.
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14
MAINTENANCE StepSeven
CheckingthePointofActuation:Raisethefluidleveltothepoint
wherethesensorsendsa“wet”signal(InputLEDwillturnAmberon
OMEGAENGINEERINGcontrollers).The“dry”signalshouldbesent
whenthefluidlevelislowered(InputLEDwillturnGreenonOMEGA
ENGINEERINGcontrollers).TheactualPointofActuation(POA)
dependsonmanyvariables,includingthethicknessofthewallandthe
dielectricvalueoftheliquid.Forexample,thickertankwallscanraise
thePOAwhilethinnerwallscouldlowerthePOA.
IfthePOAneedstobechanged,measurethedistanceandremountthe
sensorinanewlocation.
DonotattempttochangethePointofActuationbyintentional
miscalibration.
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Ifthesensordoesnotsignalwetanddryreliably,itmaybethat:
thedielectricconstantoftheapplicationfluidistoolow
thetankwallistoothickfortheapplicationfluid
therearestaticorotherelectricalchargesinthefluid
metalobjectsarewithin6"ofthesensor
calibrationwasperformedincorrectly
Trythecalibrationprocedureagain,aftermakingcorrectionsifpossible.Ifthefullandemptystatesaretoo
similardielectrically,itmaynotbepossibletouseacapacitancesensor.
TestingtheSensor:
1. Power:Applypowertosensor,byconnectingpowertothecontrollerand/orpowersupply.
2. Fullcondition:Fillthetankwiththeapplicationliquid,byfillingthetankuptothesensor’spointof
actuation.
3. Test:Withthesensorbeingfluctuatedbetweenwetanddrystates,useamultimetertoensurethat
thecorrectsignalsarebeingproducedbytheLVP‐51‐Rlevelswitch,orobservethesensorindicator
lightinthecontroller.
4. PointofActuation:Observethepointatwhichtherisingorfallingfluidlevelcausesthesensorto
changestate,andmovetheinstallationofthesensorifnecessary.
Maintenance:TheLVP‐51‐Rlevelswitchitselfrequiresnoperiodicmaintenanceexceptcleaningasrequired.
However,periodicallycleananycoatingorscalingonthetankwallthesensorisattachedtoandcheckthe
calibration.Itistheresponsibilityoftheusertodeterminetheappropriatemaintenanceschedule,basedon
thespecificcharacteristicsoftheapplicationliquids.Inaddition,anydrippingorcondensationbetweenthe
sensorandthetankwallfittingmayneedtobeperiodicallycleanedtomaintainaccuracy.
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15
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16
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