Omega LVU-150, LTU-101A, LVF-210A, and LVC-152 Series Owner's manual

Brand: Omega

Model: LVU-150, LTU-101A, LVF-210A, and LVC-152 Series

Type: Owner's 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ho ld 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.





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Omega LVU-150, LTU-101A, LVF-210A, and LVC-152 Series Owner's manual

Omega LVU-150, LTU-101A, LVF-210A, and LVC-152 Series Owner's manual

Omega LVU-150, LTU-101A, LVF-210A, and LVC-152 Series Owner's manual

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