Omega LVF-210A Series User manual

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INTRODUCTIONStepOne
AboutPoweredLevelSwitches:Thismanualcontainsinformationontwoseriesofpoweredlevelswitches;
Ultrasonic(LVU‐150series),TuningFork(LTU‐101Aseries)OpticLeak(LVF‐210Aseries)andCapacitance(LVC‐
152series).Theswitchesallfeaturetwooutputs:1)a4or20mAcurrentswitchand2)a60VASPSTdry
contactrelay.Allfourseriesaremanufacturedwiththermoplastics,includingthecable,makingthem
submersibleindesignandidealforcorrosiveapplications.PackagetheswitcheswitheitherOmega
Engineeringcontrollers(LVCN‐100seriesorLVCN‐120series)orinterfacedirectlytoanothercontrollerorPLC.
TableofContents
Specifications(Common):......................................................................................................................................4
UltrasonicSwitch(LVU‐150Series):...........................................................................................................5
TuningFork(LTU‐101ASeries):..................................................................................................................6
MaintenanceAlarm:......................................................................................................................7
OpticLeakDetection(LVF‐210Aseries):....................................................................................................8
CapacitanceSwitch(LVC‐152Series):......................................................................................................10
SafetyPrecautions:..............................................................................................................................................12
MakeaFail‐SafeSystem:..........................................................................................................................13
Installation:..........................................................................................................................................................14
ThroughWallInstallation:........................................................................................................................14
TopWallInstallation:...............................................................................................................................14
Electrical:..............................................................................................................................................................15
Wiring:..................................................................................................................................................................16
WiringtoaOmegaEngineeringController:.............................................................................................16
WiringtheRelayOutput:.........................................................................................................................17
WiringasaP‐ChannelorN‐ChannelOutput:..........................................................................................18
Maintenance:.......................................................................................................................................................19
Cleaningprocedure:.................................................................................................................................19
LTU‐101ASeriesMaintenanceAlarm:.....................................................................................................19
TestingtheInstallation:...........................................................................................................................20
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4
SPECIFICATIONS(common)StepTwo
CommonSpecifications:
Orientation: Universal
Accuracy:±1mminwater
Repeatability:±0.5mminwater
Supplyvoltage:12‐36VDC
12‐30VDC(LTU‐101Aonly)
Consumption:25mAmaximum
Contacttype:(1)SPSTrelay
Contactrating:60VA
Contactoutput:SelectableNO/NC
Processtemp.:F:‐40°to176°
C:‐40°to80°
Pressure: 150psi(10bar)@25°C.,derated
@1.667psi(.113bar)per°C.
above25°C.
Sensorrating:NEMA6(IP68)
Cabletype: 4‐conductor,#22AWG(shielded)
Cablelength:10'(3m)‐Standard
25'(7.6m)or50'(15.2m)‐Special
Processmount:3/4"NPT(3/4”G/R)
Classification:Generalpurpose
Mount.Gasket:FKM(Gversiononly)
CEcompliance:EN61326EMC/EN61010‐1safety
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SPECIFICATIONS(ultrasonic)StepTwo
UltrasonicSwitch(LVU‐150series):TheUltrasoniclevelswitchgeneratesa1.5MHzultrasonicwavefroma
miniaturepiezoelectrictransducerlocatedononesideofthegapinitssensingtip.Anotherpiezotransducer
locatedontheothersideofthegapactsasamicrophone,pickingupthesound.Whenliquidentersthegapin
thesensingtip,theaudiolevelchanges.
LVU‐152‐R&LVU‐153‐RLVU‐150‐R&LVU‐151‐R
LVU‐152‐G‐R&LVU‐153‐G‐RLVU‐150‐G‐R&LVU‐151‐G‐R
Thesensorshouldbeinstalledsothattheliquidwilldripoutofthegapwhenthesensorbecomesdry.
LVU‐150SeriesSpecifications:
Sensormaterial:‐150/‐152:PP
‐151/‐153:PFA
Cablejacketmat’l:‐150/‐152:PP
‐151/‐153:PFA
Configurations:
Part
NumberLengthMaterial (body)
Material
(cable)
Cable
Length
LVU‐150‐RShort(3”)PolypropylenePolypropylene10’
LVU‐150‐G‐RShort(3”)PolypropylenePolypropylene10’
LVU‐151‐RShort(3”)PFAFEP10’
LVU‐151‐G‐RShort(3”)PFAFEP10’
LVU‐152‐RLong(4.5”)PolypropylenePolypropylene10’
LVU‐152‐G‐RLong(4.5”)PolypropylenePolypropylene10’
LVU‐153‐RLong(4.5”)PFAFEP10’
LVU‐153‐G‐RLong(4.5”)PFAFEP10’
Note:allultrasoniclevelswitchesareavailablewithlongerlengthscableof25’and50’.For25’ofcable,add
(‐25)totheendofthepartnumberandfor50’ofcable,add(‐50)totheendofthepartnumber.Example,
LVU‐150‐R‐25willhave25’ofcable.
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6
SENSORINFORMATION(tuningfork)StepThree
TuningForkSwitch(LTU‐101ASeries):TheTuningForkswitchoperatesatanominalfrequencyof400Hz.As
theswitchbecomesimmersedinaliquidorslurry,acorrespondingfrequencyshiftoccurs.Whenthe
measuredfrequencyshiftreachesthesetpointvalue,theswitchchangesstateindicatingthepresenceofa
liquidorslurrymedium.Foroptimumperformanceandproactivemaintenance,thesensorautomatically
adjustsforcoating,andifnecessary,outputsapreventativemaintenancealarm.
LTU‐101A‐R
LTU‐101A‐G‐R
Donotsqueezetheforkstogether.Doingsocoulddamageorbreakthesensorandvoidthewarranty.
WhenpoweringuptheLTU‐101Aseries,thestart‐upprocedurerequirestheswitchtocyclethroughawet
conditionfor1/2secondinordertodetermineaninitialresonance.
LTU‐101ASeriesSpecifications:
Sensormaterial:PPS(glassfill)
FKMcablegrommet
Maint.alarm:NPNtransistor,10mAmax.
Cablejacketmat’l:PP
Cabletype:5‐conductor,#24AWG
(shielded)
Configurations:
PartNumberMaterial
(body)
Material
(cable)
Thread
(insidexoutside)
LTU‐101A‐RPolyphenyleneSulfidePolypropylene¾”NPTx¾”NPT
LTU‐101A‐G‐RPolyphenyleneSulfidePolypropylene¾”Rx¾”G
Note:alltuningforklevelswitchesareavailablewithlongerlengthscableof25’and50’.For25’ofcable,add
(‐25)totheendofthepartnumberandfor50’ofcable,add(‐50)totheendofthepartnumber.Example,
LTU‐101A‐R‐25willhave25’ofcable.
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SENSORINFORMATION(tuningfork)StepThree
MaintenanceAlarm(LTU‐101AseriesTuningForkonly):Foroptimumperformanceandproactive
maintenance,thesensorautomaticallyadjustsforcoating,andifnecessary,outputsapreventative
maintenancealarm.TheYellowwireisaNPNtransistordesignedtoswitchwhenabuild‐upofmaterial
preventsthetuningforkswitchfromoperatingatitsoperationalfrequency.UsetheYellowwiretoidentify
whentheTuningForkswitchrequirescleaning.TowirethemaintenanceoutputwiretoanLED,followthe
wiringdiagrambelow.TheYellowwireisconnectedtotheLEDanda2.2kΩresistorinseriesandreferenced
backtothe(+)ofthepowersupply.
SensorPower
[RED&BLKwires]/36VDCMax.
8±1mADry/22±1mAWet
RelayRating
[GRN&WHTwires]/60VA
MaintenanceAlarm
[YELwire]/NPNTransistor/10mAMax.
TowirethemaintenanceoutputwiretoaPLC,followthewiringdiagrambelow.TheYellowwireisconnected
tothePLCinputwitha10kΩresistorparalleltothePLCinputandthe(+)ofthepowersupply.
SensorPower
[RED&BLKwires]/36VDCMax.
8±1mADry/22±1mAWet
RelayRating
[GRN&WHTwires]/60VA
MaintenanceAlarm
[YELwire]/NPNTransistor/10mAMax.
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8
SPECIFICATIONS(optic)StepTwo
OpticLeakDetectionSwitch(LVF‐210Aseries):TheOpticLeakDetectoruseprinciplesofopticalrefractionto
detectthepresenceorabsenceoffluid.Apulsedinfraredlightbeamisinternallygeneratedbyalight
emittingdiodeandaimedattheslantedopticaltipofthesensor.Ifthetipisdry,thelightbeambouncesata
90degreeangletoareceivingphototransistor,indicatingadrycondition.Ifthetipisimmersedinliquid,the
lightbeamwillrefractoutintotheliquidinsteadofbeingreflectedtothephototransistor,indicatingawet
condition.
TheLVF‐210Aseriesisdesignedasaleakdetectionswitch.Theswitchshouldbeinstalledin
applicationswhereundernormalconditions,itremainsawayfromtheliquidandwillonlycomeinto
contactduringaleak.
LVF‐212A‐R&LVF‐213‐RLVF‐210A‐R&LVF‐211A‐R
LVF‐212A‐G‐R&LVF‐213‐G‐RLVF‐210A‐G‐R&LVF‐211A‐G‐R
TheOpticLeakDetectorcannotdetectthepresenceorabsenceofspecularapplicationliquidsthat
reflectlight(suchasmilk),orviscousliquids(suchaspaint)thatformacoatingonthesensortip.
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9
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SPECIFICATIONS(optic)StepTwo
LVF‐210ASeriesSpecifications:
Sensormaterial:‐210A/‐212A:PP
‐211A/‐213A:PFA
Cablejacketmat’l:‐210A/‐212A:PP
‐211A/‐213A:PFA
Configurations:
Part
NumberLengthMaterial (body)
Material
(cable)
CablesideSensorside
LVF‐210A‐RShort(3”)PolypropylenePolypropylene(3/4”NPT)(3/4”NPT)
LVF‐210A‐G‐RShort(3”)PolypropylenePolypropylene(3/4”R)(3/4”R)
LVF‐211A‐RShort(3”)PFAPFA(3/4”NPT)(3/4”NPT)
LVF‐211A‐G‐RShort(3”)PFAPFA(3/4”R)(3/4”G)
LVF‐212A‐RLong(4.5”)PolypropylenePolypropylene(3/4”NPT)(3/4”NPT)
LVF‐212A‐G‐RLong(4.5”)PolypropylenePolypropylene(3/4”R)(3/4”R)
LVF‐213A‐RLong(4.5”)PFAPFA(3/4”NPT)(3/4”NPT)
LVF‐213A‐G‐RLong(4.5”)PFAPFA(3/4”R)(3/4”G)
Note:allopticleakdetectionlevelswitchesareavailablewithlongerlengthscableof25’and50’.For25’of
cable,add(‐25)totheendofthepartnumberandfor50’ofcable,add(‐50)totheendofthepartnumber.
Example,LVF‐210A‐R‐25willhave25’ofcable.
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10
SPECIFICATIONS(capacitance)StepTwo
CapacitanceSwitch(LVC‐152series):Thecapacitancelevelswitchgeneratesapulse‐waveradiofrequency
signalfromthecapacitanceelectrodelocatedinthesensingtipofeachsensor.Whenliquidcomesinto
contactwiththesensingtip,thecapacitanceasmeasuredbythesensorchangesbasedonthedielectric
constantoftheliquid.Theguardcircuitrejectsthenegativeeffectsofcoatingbuildupontheprobeby
eliminatingthecoatingsignalpathbetweentheactiveandreferenceelectrodes.
AvoidinstallingtheLVC‐152seriesinmetalfittingsandkeepthesensor6”awayfrommetalobjects.Itis
possibleforalargemetalobjecttoinfluencethesensor’soperation.
LVC‐152‐R
LVC‐152‐G‐R
Thesensor’soperationmayvarybasedonthedielectricpropertiesofvariousapplicationliquids.The
LVC‐152seriessensorisfactory‐calibratedtobeusedwithliquidswithadielectricvaluebetween20and
80.Liquidswithadielectricconstantlessthan20willnotbedetectedbyanLVC‐152seriessensor.
TableofCommonDielectricConstants:NOTE:Liquidswithadielectricconstantlessthan20willnotbe
detectedbyanLVC‐152serieslevelswitch.
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 .................
Oils, mineral ....2.3 to 2.4
Oils, petroleum.................
Oleic acid ....................2.5
Propane, liquid
......................... 1.8 to 1.9
Potassium nitrate5.0 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


11

SPECIFICATIONS(capacitance)StepTwo
LVC‐152SeriesSpecifications:
Dielectricrange: >20constants
Conductiverange:>100miromhos
Sensormaterial:PP
Cablejacketmat’l:PP
Configurations:
Part
NumberLengthMaterial (body)
Material
(cable)
CablesideSensorside
LVC‐152‐RLong(4.5”)PolypropylenePolypropylene(3/4”NPT)(3/4”NPT)
LVC‐152‐G‐RLong(4.5”)PolypropylenePolypropylene(3/4”R)(3/4”G)
Note:allcapacitancelevelswitchesareavailablewithlongerlengthscableof25’and50’.For25’ofcable,add
(‐25)totheendofthepartnumberandfor50’ofcable,add(‐50)totheendofthepartnumber.Example,
LVC‐152‐R‐25willhave25’ofcable.
TestingTip:TheLVC‐152seriessensorlooksforchangesincapacitancebaseduponthedielectricconstantof
theliquid.Althoughwaterhasahighdielectricconstant,thevolumeofacupofwaterwillnothaveenough
changeincapacitancetoswitchthesensorintoawetcondition.Onewaytoincreasethecapacitanceforthe
cupofwateristodipyourfingerintothecup.Thevolumeofwaterwithinyourbodywilladdtothewaterin
thecupandwillresultinthesensoridentifyingawetcondition.


12
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PoweredLevelSwitches:LVU‐150series,
LTU‐101Aseries,LVF‐210AseriesandLVC‐152series.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.Useapropersealantwithallinstallations.Neverovertightenthe
sensorwithinthefitting,beyondamaximumof80inch‐poundstorque.Alwayscheckforleakspriortosystem
start‐up.
MaterialCompatibility:TheLVU‐150seriesandLVF‐210Aseriessensorsareavailableintwodifferent
wettedmaterials.ModelsLVU‐150,LVU‐152,LVF‐210AandLVF‐212AaremadeofPolypropylene(PP).
ModelsLVU‐151,LVU‐153,LVF‐211AandLVF‐213AaremadeofPerfluoroalkoxy(PFA).TheLTU‐101Aseriesis
madeofPPS(40%glassfilled)andtheLVC‐152seriesismadeofPP.Makesurethatthemodelyouhave
selectediscompatiblewiththeapplicationliquid.Todeterminethechemicalcompatibilitybetweenthe
sensoranditsapplicationliquids,refertoanindustryreferencesuchastheCompassCorrosion.
WiringandElectrical:Thesupplyvoltageusedtopowerthesensorshouldneverexceedamaximumof36
voltsDC(30VDCforLTU‐101Aseries).Electricalwiringofthesensorshouldbeperformedinaccordancewith
allapplicablenational,state,andlocalcodes.
Flammable,ExplosiveandHazardousApplications:DONOTUSETHELVU‐150SERIES,LTU‐101ASERIES,
LFV‐210ASERIESorLVC‐152SERIESGENERALPURPOSESWITCHINHAZARDOUSLOCATIONS.
Warning 
Theratingfortherelayis60VA.
OmegaEngineering’spoweredlevelswitchesarenotrecommendedforusewithelectricallycharged
applicationliquids.Formostreliableoperation,theliquidbeingmeasuredmayneedtobeelectrically
grounded.
Alwaysinstallthe¾”FKMgasketwithallversionsofthepoweredsensorswithmetric(G)threads.The
metric(G)threadedversionwillnotsealunlessthegasketisinstalled.




13

SAFETYPRECAUTION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.
Allofthepoweredlevelsensorshaveasingleinternal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.


14
INSTALLATION StepFour
ThroughWallInstallation:OmegaEngineering’s
poweredlevelswitchesmaybeinstalledthroughthe
top,sideorbottomofatankwall.Thesensorhas
male3/4"NPT(R/G)threadsoneithersideofa
15/16"wrenchflat.Thisenablestheusertoselect
thesensor’smountingorientation,installedoutside
ofthetankin,orinsideofthetankout.

TopWallInstallation:Thepoweredlevelswitchesmaybeinstalledthroughthetopwallofatank.Omega
Engineering’sleveltrackmountingsystemLVM‐10seriesisanin‐tankfittingwhichenablesuserstoinstallup
tofourOMEGAENGINEERINGsensorsofanytechnology,toanydepth,alongtheentirelengthoftrack.The
LVM‐10seriesmaybeinstalledthroughthetopwallofanytankusingastandard2"NPTtankadapter.Ifno
tanktopinstallationisavailable,OmegaEngineering'ssidemountbracket,LVM‐30,enablestheLVM‐10series
tobeinstalleddirectlytothesidewallofatank.DonotusethePFAbodiedsensorswithLVM‐10series.
OmegaEngineering’sLVM‐50seriesleveltrackmountingsystemisanin‐tankfittingwhichenablesusersto
installoneOMEGAENGINEERINGsensor,ofanytechnology,toaspecificdepth.TheOmegaEngineering
sensormaybeinstalledontothe3/4"NPTadapterattheendoftheLVM‐50series.TheLVM‐50seriesmaybe
installedthroughthetopwallofanytankusingastandard2"NPTtankadapter.OmegaEngineering'sside
mountbracket,modelLVM‐30,mayalsobeusediftopwallinstallationisnotavailable.




15

ELECTRICALStepFive
SupplyVoltage:Thesupplyvoltagetothepoweredlevelswitchshouldneverexceedamaximumof36VDC
(30VDCwithLTU‐101Aseries).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(30VDCwithLTU‐101A
series),mayalsobeusedwiththepoweredlevelswitch.
RequiredCableLength:Determinethelengthofcablerequiredbetweenthepowered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(8mAwithLTU‐101A
series),and22mAwhenwet.NC/NOstatusmustbe
setbythecontroller.TheWhiteandGreenwiresare
notused.
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).Thesensor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of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:

16
WIRING StepSix
WiringtoaOMEGAENGINEERINGController
LVCN‐120SeriesController(4or20mAoutput):
LVCN‐120Shown
LVCN‐100SeriesController(4or20mAoutput):
LVCN‐20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.


17

WIRING(continued)StepSix
WiringtheRelayOutput:Thesensorrequires12‐36VDC(30VDCmax.forLTU‐101Aseries)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/22±1mAWet
8±1mADry(LTU‐101Aseriesonly)
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/22±1mAWet
8±1mADry(LTU‐101Aseriesonly)
RelayRating
[GRN&WHTwires]/60VA



18
WIRING(continued)StepSix
WiringasaP‐ChannelorN‐Channeloutput:ThesensorcanbesubstitutedforeitheraP‐Channel(PNP,
sourcing)outputora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.
(30VDCMax.forLTU‐101Aseries)
5±1mADry/22±1mAWet
8±1mADry(LTU‐101Aseriesonly)
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.
(30VDCMax.forLTU‐101Aseries)
5±1mADry/22±1mAWet
8±1mADry(LTU‐101Aseriesonly)
RelayRating
[GRN&WHTwires]/60VA


19

MAINTENANCE StepSeven
General:Thepoweredlevelswitchrequiresnoperiodicmaintenanceexceptcleaningasrequired.Itisthe
responsibilityoftheusertodeterminetheappropriatemaintenanceschedule,basedonthespecific
characteristicsoftheapplicationliquids.
Cleaningprocedure:
1. Power:Makesurethatallpowertotheswitch,controllerand/orpowersupplyisdisconnected.
2. Switchremoval:Inallthrough‐wallinstallations,makesurethatthetankisdrainedwellbelowthe
sensorpriortoremoval.Carefully,removethesensorfromtheinstallation.
3. Cleaningtheswitch:Useasoftbristlebrushandmilddetergent,carefullywashthelevelswitch.Do
notuseharshabrasivessuchassteelwoolorsandpaper,whichmightdamagethesurfacesensor.Do
notuseincompatiblesolventswhichmaydamagethesensor'sPP,PFA,PVDForPPSplasticbody.
4. Sensorinstallation:FollowtheappropriatestepsofinstallationasoutlinedintheInstallation.
MaintenanceOutputtoLED(LTU‐101Aseries only): 
TowirethemaintenanceoutputwiretoanLED,
followthewiringdiagrambelow.TheYellowwireis
connectedtotheLEDanda2.2kΩ resistorinseries
andreferencedbacktothe(+)ofthepowersupply.
MaintenanceOutputtoPLC(LTU‐101Aseries only): 
TowirethemaintenanceoutputwiretoaPLC,follow
thewiringdiagrambelow.TheYellowwireis
connectedtothePLCinputwitha10kΩ resistor
paralleltothePLCinputandthe(+)ofthepower
supply.
SensorPower
[RED&BLKwires]/30VDCMax.
8±1mADry/22±1mAWet
RelayRating
[GRN&WHTwires]/60
VA
MaintenanceAlarm
[YELwire]/NPNTransistor/10mAMax.




20
MAINTENANCE(continued)StepSeven
Testingtheinstallation:
1. Power:Turnonpowertothecontrollerand/orpowersupply.
2. Immersingtheswitch:Immersethesensingtipinitsapplicationliquid,byfillingthetankuptothe
switchespointofactuation.Analternatemethodistoholdacupfilledwithliquiduptotheswitch'stip.
3. Test:Withtheswitchbeingfluctuatedbetweenwetanddrystates,theswitchindicatorlightinthe
controllershouldturnonandoff.Ifthecontrollerdoesn'thaveaninputindicator,useavoltmeteror
ammetertoensurethattheswitchproducesthecorrectsignal(seebelow).
4. Pointofactuation:Observethepointatwhichtherisingorfallingfluidlevelcausestheswitchto
changestate,andadjusttheinstallationoftheswitchifnecessary.

Example:TestingtheLVU‐150serieswithaMultimetersettoreadcurrent(mA).WhenwiredNO[Redto(+)],
themeterwillread5mA,±1mAwhendryandwillread20mA,±1mAwhenwet.


Example:TestingtheLVU‐150serieswithamultimetersettoreadresistance(ohms).WhenwiredNO[Redto
(+)],themeterwillreadO.Lwhendryandwillreadsomesmallamountofresistance(ex.0.2Ohms)whenwet.


