Omega LVU-301 & LVU-303 Series Owner's manual

Brand: Omega

Model: LVU-301 & LVU-303 Series

Type: Owner's manual

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INTRODUCTION/TABLEOFCONTENTS StepOne

An ultrasonic sound wave is pulse eight times per second from the base of the transducer. The sound wave

reflects against the process medium below and returns to the transducer. The microprocessor based

electronics measure the time of flight between the sound generation and receipt, and translates this figure

intothedistancebetweenthetransducerandprocessmediumbelow.

TableofContents

Specifications......................................................................................................................................................................4

Dimensions.................................................................................................................................................................4

Components...............................................................................................................................................................5

Sinkingvs.Sourcing....................................................................................................................................................5

SafetyPrecautions..................................................................................................................................................................6

Menu/Definitions..................................................................................................................................................................7

Configuration......................................................................................................................................................................9

 StepsforBasicConfiguration....................................................................................................................................9

 SelectingUnitsofOperation.....................................................................................................................................9

 ConfigureSensor’sCurrentRange............................................................................................................................9

 ConfigureSe

nsor’sRelay...............................................................................................................................

..........10

Wiring ....................................................................................................................................................................11

Installation....................................................................................................................................................................12

 MountingGuide.......................................................................................................................................................12

 FittingSelection.......................................................................................................................................................13

TankAdapter...............................................................................................................................................13

Riser............................................................................................................................................................13

Flange..........................................................................................................................................................13

SideMountFitting......................................................................................................................................14

StandPipe...................................................................................................................................................14

RelayExamples....................................................................................................................................................................15

 Ex:HighAlar

m...............................................................................................................................

...........................15

 Ex:AutomaticFill.....................................................................................................................................................15

Maintenance/AdvancedFeatures.......................................................................................................................................16

 FactorySettingsandReset.......................................................................................................................................16

 ChangingDisplayunits.............................................................................................................................................16

 Testingthetransmitter............................................................................................................................................16

Troubleshooting....................................................................................................................................................................17

 SolutionTable..........................................................................................................................................................17

 OtherHints...............................................................................................................................................................18

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4

SPECIFICATIONS StepTwo

Range: 0.5to24.5feet

 (15cmto7.4m)

Accuracy: ±0.25%ofrange(air)

Resolution: 0.125”(3mm)

Frequency: 50kHz

PulseRate: 8pulsespersecond

DeadBand: 6”(15cm)

Beamwidth: 8°conical

Configuration: Pushbutton

Memory: Non‐volatile

DisplayType: 4segmentLED

Displayunits: Inchorcm

LEDIndication: Relaystatus

SupplyVoltage: 14‐36VDC

Consumption: 200mA

Signaloutput: 4‐20mA,three‐wire

Signalinvert: 4‐20mA/20‐4mA

Currentflow: Sourcingorsinking

Contacttype: (1)SPDTrelay,latching

Contactrating: 250VAC,10A

Contactlogic: Singlepoint:alarm

 Twopoint:latching

Contactfail‐safe: Revertstosafestateduring

echoloss

ProcessTemp.: F:‐4°to140°

 C:‐20°to60°

Temp.Compensation: Automatic

Ambienttemp.: F:‐40°to140°

 C:‐40°to60°

Pressure: 30psi(2bar)@25°C.,

derated@1.667psi(.113

bar)per°C.above25°C.

Enclosurerating: NEMA4X(IP65)

Enclosurematerial: Polypropylene,U.L.94VO

Conduitentrance: Single,1/2"NPT

Cablelength: 9”(22cm)

Cabletype: Power/signal:3‐conductor

 Relay:3‐conductor

Cablejacketmat’l: Vinyl

Transducermaterial: PolyvinylideneFluoride

(PVDF)

Processmount: 2”NPT

Classification: GeneralPurpose

Compliance: CE

LVU‐301/‐303Series

SideView



LVU‐301/‐303Series

CableView



 5

SPECIFICATIONS StepTwo

Components:LVU‐301/‐303Seriesisofferedindifferentmodels.Dependingonthemodelpurchased,youmayormay

nothavebeenshippedallthecomponents shownbelow.

 QuickStartGuide

Sinkingvs.Sourcing:TheLVU‐301/‐303Seriesismanufacturedintwodifferent outputs,sourcingandsinking.

A sourcing transmitter uses the negative of the power supply as the reference for the entire system. When

using a sourcing unit, make sure that the negative of the ground is the common for the entire system. A

sinkingtransmitterusesthepositiveofthepowersupplyasthe referencefortheentiresystem.Whenusinga

sinkingunit,makesurethepositiveofthegroundisthecommonfortheentiresystem.

Sourcing(LVU‐303) Sinking(LVU‐301)

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P/N Max.Range DeadBand Thread CurrentOutput Relay

LVU‐303 24.5’(7.47m) 6”(15.2cm) 2”NPT Sourcing (1)

LVU‐301 24.5’(7.47m) 6”(15.2cm) 2”NPT Sinking (1)

6

SAFETYPRECAUTIONSStepThree

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AboutthisManual:PLEASEREADTHEENTIREMANUALPRIORTOINSTALLINGORUSINGTHISPRODUCT.

This manual includes information on the continuous ultrasonic level transmitter from OMEGA

ENGINEERING;modelLVU‐301orLVU‐303.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sensors

and technologies.While each of these technologies are designed to operate in a wide variety of

applications, it is the user’s responsibility to select a technology that is appropriate for the application,

installitproperly,performtest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transmitterwithinthefitting.Alwayscheckforleakspriortosystemstart‐up.

Wiring and Electrical:A supply  voltage of 14‐36 VDC (200 mA minimum  supply) is used to power the

ultrasonictransmitter.Thesensorsystemshouldneverexceedamaximumof36VDC.Electricalwiringof

thesensorshouldbeperformedinaccordancewithallapplicablenational,state,andlocalcodes.

TemperatureandPressure:TheLVU‐301/‐303seriesisdesignedforuseinapplicationtemperaturesfrom

‐20°C(‐4°F)to60°C(140°F),andforuseatpressuresupto30psi(2bar)@ 25°C,derated@1.667psi

(0113bar)per°Cabove25°C.

Material Compatibility:The continuous ultrasonic level transmitter is made of two materials.The

enclosure is a Polypropylene (PP) and the transducer is made of Polyvinylidene Fluoride (PVDF).Make

surethatthemodelwhichyouhaveselectedischemicallycompatiblewiththeapplicationliquids.While

the transmitter housing is liquid resistant when installed properly, it is not designed tobe immersed.It

shouldnotbemountedinsuchawaythatitdoesnotnormallycomeintocontactwithfluid.

Flammable, Explosive and Hazardous Applications: The LVU‐301/‐303 series level transmitter system

shouldnotbenormallywithinflammableorexplosiveapplication.

Make a Fail‐Safe System:Design a Fail‐Safe system thataccommodatesthepossibility of transmitteror

power failure.In critical application OMEGA ENGINEERING recommends the use of redundant backup

systemsandalarmsinadditiontotheprimarysystem.

 7

MENU/DEFINITIONS StepFour

Gettingaround:LVU‐301/‐303Seriesisconfiguredbytheuseoffourpushbuttons(UP,DOWN,MENUand

SET)andaLCDdisplay.Thedisplaywillalwaysreadthedistancefromthebottomofthesensortothe surface

oftheliquid(airgap).

MainMenu:HoldingdowntheMENUbuttonwillscrolldownthemainmenuoftheLVU‐301/‐303Series.

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Definitions:Allmeasurementusedforconfiguration oftheLVU‐301/‐303Seriesaremadefromthebottomof

thetransmitterdown.

EC4:This is the 4 mA setting for the LVU‐301/‐303 Series.The EC4 is the

distancefromthebottomofthetransmittertothe4mAsetpoint.Typically,

theEC4or4mAsettingisatthebottomofthetank.Thefurtherawayfrom

thesensor,thelargerthenumberwillbe.Thissettingismeasuredineither

inchesorcentimetersonthedisplay.

EC20:Thisisthe20mAsettingfortheLVU‐301/‐303Series.TheEC20isthe

distance from the bottom of the transmitter to the 20 mA set point.

Typically,theEC20or20mAsettingisatthe topofthetank.Thecloserto

thesensor,thesmallerthenumberwillbe.Thissettingismeasuredineither

inchesorcentimetersonthedisplay.

Reversingthe4‐20mAsignal:SettingtheEC4atthebottomofthetankandEC20atthetopofthetankwill

createa4‐20mAoutputthathas4mAatemptyand20mAatfull.Toreversethe4‐20mAsign

al,setEC4at

thetopofthetankandEC20atthebottomofthetank.

RLAY:Indicatorforthenexttwomodes.The10Arelayislatchedbetweenthe

HSETandLSETpoints.

HEST & LSET: Sets the high point and low point for relay activation.Values

arebaseduponthedistancefromthebottomofthesensordowntowardsthe

liquid.

 HSET:Internal relay will de‐energize when display value is less than

theHSETvalue.

 LSET:Internal relay will energize when display value is greater than

theLSETvalue.

TheHSETvalueisalwayslessthattheLSETvalue.Toactivatetherelayfromasinglepoint,setHSETandLSET

tothesamevalue. 

8

MENU/DEFINITIONS(continued) StepFour

SAF1/SAF2:Thisisthefail‐safesettingfortheLVU‐301/‐303Series.UsetheSAF_settingtodetermineafail–

safemodefortheinternalrelay.When[SAF1]isset,thewillde‐energizeifthesignalbecomesLOST.When

[SAF2]isset,therelaywillenergizeifthesignalbecomesLOST.

LOST:ALOSTstatewilloccurwhenthesensordoesnotreceiveareturnsoundpulsesignal.Whenthis

occurs,thedisplaywillshowLOSTandthecurrentoutputwilldefaulttotheSAF_setting.Thesensor

will remain in this condition until a valid signal is acquired.No values in the MENU can be changed

untiltheLOSTconditionhasbeenresolved.

FAST/SLOW:  FAST and SLOW sets the reaction time for the SAF1/2 setting when the sensor enters a LOST

state.[FAST]isthetypicalsettingforthesensortooperate.ThetimefortheRELAYtodefaultis30seconds

for[FAST]modeand2.5minutesfor[SLOW]mode.

TochangetheFAST/SLOWsetting,followthestepsbelow:

1. Hold[MENU]keyuntilFASTorSLOWappearsinthedisplay.

2. Release[MENU]keyandhold[SET]keytotogglebetweenFASTandSLOW.

3. Whendesiredsettingisreached,release[SET]key.Thelastdisplaysettingwillbelockedintomemory.

ALIN:Usethismodeasanaidtolevelingthesensorinstalledinaself‐aligningorrotationalbulkheadfitting.

DisplaywillshowthereturnsignalstrengthindB’s.Foroptimumalignment,firstenergizetheunitandreceive

a valid return signal.Then select the ALIN mode and adjust the LVU‐301/‐303 series until the display is

maximized.Typicalreadingsrangebetween2and60dB’s.

ON/OFF:Thisisthe actualactivationsetting forALINmode.Defaultis[OFF].Setto[ON]toviewtheALIN

readings.TheALINmodemustbeturned[OFF]whenalignmentiscompleted.

ToALINasensor,followthestepsbelow:

1. Hold[MENU]keyuntilOFFappearsinthedisplay.

a. OFFwillappearrightafterALIN

2. Release[MENU]keyandimmediatelyhold[SET]keytotogglefromOFFtoON.

3. Release[SET]key.TheLV

U‐301/‐303seriesisnowinALINmode.

4. Adjustthesensorsothedisplayshowsthelargestvalue.

a. Whenthehighestvalueisshown,lockthesensorinplace.

5. ToexitALINmode,repeatsteps1‐4changingfromONtoOFF.



TANK:The TANK sets the maximum tank height and will filter out all returns

greaterthatthisvalue.RegardlessofhowtheEC4andEC20areset,setTANK

totheEmptytankdistanceorgreater.

(VALUE):ThenumberafterTANKshowsthesettingforTANK.Thisvalueisthe

actual TANK setting that can be changed for the application.The maximum

distanceis300.0inches.



 9

CONFIGURATION StepFive

StepsforBasicConfiguration:

1. SelectandSettheunitsofoperation.

2. ConfiguretheSensor’sCurrentRangeusingtheEC4andEC20settingsinthemainmenu.

a. Thetankleveldoesnotneedtobeemptyorfullforthisoperation.

3. ConfiguretheRelaylevelsettingsusingtheHSETandLSETsettingsinthemainmenu.

a. Thetankleveldoesnotneedtobeemptyorfullforthisoperation.

4. SettheOperationalRangeusingtheTANKsettingsinthemainmenu.

a. Thetankleveldoesnotneedtobeemptyorfullforthisoperation.

5. SelecttheFail‐SafesettingusingtheSAF_settinginthemainmenu.

SelectingUnitsofOperation(InchesorCM):ThedefaultfortheLVU‐301/‐303Seriesistodisplayininches.If

powerisremoved,thesensorwillremainintheselectedmode.Thisoperationselectstheunitsofoperationfor

the configuration of the transmitter.This selection has no effect on the output of the sensor.The 4‐20 mA

outputcanbescaledtoreadinanyengineeringunits.

Tochangetocentimeters Tochangetoinches



1. Removepowertothesensorandwait10seconds.

2. Simultaneouslypress[∆]and[SET]whileadding

powertothetransmitter.

3. Thesensorwillnowreadincentimeters.

1. Removepowertothesensorandwait10seconds.

2. Simultaneouslypress[]and[SET]whileadding

powertothetransmitter.

3. Thesensorwillnowreadininches.

ConfiguretheSensor’sCurrentRangeusingEC4andEC20

EC4:Allmeasurementusedforconfigurationofthesensoraremadefromthebottomofthetransmitter down. 

1. MeasurethedistancefromthebottomofthesensortothedesiredEC4setpoint.

2. Hold[MENU]keyuntilEC4appearsindisplay.

3. Release[MENU]keyandwaituntilavalueappears.

a. Thevaluethatappearsisthecurrentdistancefromthesensortothesurfaceoftheliquid.

4. Immediatelypressthe[∆]or[]keystoviewthememoryvalueforEC4.



5. Usethe[∆]or[]keystoraiseorlowerthedisplaytothedesiredvalue.

a. Ifthekeysremainuntouchedformorethan3seconds,thesensorwillexitthemenu.

6. Pressthe[SET]keytoenterthisvalueasthenewEC4setpoint.

EC20:Allmeasurementusedforconfigurationofthesensoraremadefromthebottomofthetransmitte rdown.

1. MeasurethedistancefromthebottomofthesensortothedesiredEC20setpoint.

2. Hold[MENU]keyuntilEC20appearsindisplay.

3. Release[MENU]keyandwaituntilavalueappears.

a. Thevaluethatappearsisthecurrentdistancefromthesensortothesurfaceoftheliquid.

4. Immediatelypressthe[∆]or[]keystoviewthememoryvalueforEC20.



5. Usethe[∆]or[]keystoraiseorlowerthedisplaytothedesiredvalue.

a. Ifthekeysremainuntouchedformorethan3seconds,thesensorwillexitthemenu

.

6. Pressthe[SET]keytoenterthisvalueasthenewEC20setpoint.

10

CONFIGURATION(continued) StepFive

SettheRELAYusingHSETandLSET

HSET:Allmeasurementusedforconfigurationofthesensoraremadefromthebottomofthetransmitterdown. 

1. MeasurethedistancefromthebottomofthesensortothedesiredHSETsetpoint.

2. Hold[MENU]keyuntilHSETappearsinthedisplay.

3. Release[MENU]keyandwaituntilavalueappears(thisisthememoryvalueforHSET).

4. Usethe[∆]or[]keystoraiseorlowerthedisplaytothedesiredvalue.

a. Ifthekeysremainuntouchedformorethan3seconds,thesensorwillexitthemenu.

5. Pressthe[SET]keytoenterthisvalueasthenewHSETsetpoint.

LSET:Allmeasurementusedforconfigurationofthesensoraremadefromthebottomofthetransmitterdown. 

1. MeasurethedistancefromthebottomofthesensortothedesiredLSETsetpoint.

2. Hold[MENU]keyuntilHSETappearsinthedisplay.

3. Release[MENU]keyandwaituntilavalueappears(thisisthememoryvalueforLSET).

4. Usethe[∆]or[]keystoraiseorlowerthedisplaytothedesiredvalue.

a. Ifthekeysremainuntouchedformorethan3seconds,thesensorwillexitthemenu.

5. Pressthe[SET]keytoenterthisvalueasthenewLSETsetpoint.

SetOperationalRangeusingTANK

TANK:Allmeasurementusedforconfigurationofthesensoraremadefromthebottomofthetransmitte rdown.

1. MeasurethedistancefromthebottomofthesensortothedesiredMAXRsetpoint.

2. Hold[MENU]keyuntilthevalueafterMAXRappearsinthedisplay.

a. ThisvalueisthecurrentMAXRsetting.

3. Ifthisisacceptable,press[SET]tolockthevalueastheMAXRsetting.Ifnot,usethe[∆]or[]keys

toraiseorlowerthevaluetothedesiredsetting.

4. Pressthe[SET]keytoenterthisvalueasthenewMAXRsetting.

SelecttheFail‐SafeSetting

SAF_:

1. Hold[MENU]keyuntilSAF1orSAF2appearsinthedisplay.

2. Release[MENU]keyandhold[SET]keytotogglebetweenSAF1orSAF2.

3. When desired setting is reached, release [SET] key. The last display setting will be locked into

memory.



EC4andEC20Distances

ShownAbove

HSETandLSETDistances

ShownAbove

TANKDistances

ShownAbove

 11

WIRING StepSix

TheLVU‐301/‐303Seriesrequires14‐36VDCpowerwithatleast200mAsupplyinordertooperate.

WiringtoGenericLoopPoweredDisplay:

 SourcingLVU‐303



SinkingLVU‐301



WiringtoGenericPLC:

 SourcingLVU‐303



SinkingLVU‐301



WiringtotheLVCN‐51SeriesLevelController:

Note:CheckLVCN‐51seriesmanualregardingsettingtheLVCN‐51seriestoworkwithaSourcingLVU‐303(JWB

mode)orSinkingLVU‐301(JWAmode).





12

INSTALLATION StepSeven

The LVU‐301/‐303 Series should always be mounted perpendicular to the liquid.Make sure that the fitting

and transmitter threads are not damaged or worn.Always hand‐tighten the transmitter within the fitting.

Performaninstalledleaktestundernormalprocessconditionspriortosystemstartup.

MountingGuide

1. Donotmountatanangle

2. Liquidshouldneverenterthedeadband

3. SideWall‐UsetheBeamWidthdatatofindtheclosestthesensorcanbetothesidewall

4. Donotmountwhereobstacleswillintrudeonsensor’sbeamwidth

5. Donotmountinavacuum

6. Avoidmountinginthecenterofadometoptank.

7. Inconebottomtank,positionthesensoroverthedeepestpartofthetank.

Donotinstall

sensoratan

angle



AvoidInterference

fromsideoftank

Donotinstall

withobjectsin

thebeam.



Donotinstallin

applicationswith

vacuum.



Installation in existing fittings:If the existing fitting is larger than the threads of the LVU‐301/‐303 Series,

selectareducerbushingsuchasLVU800‐2N80(3”threadx2”thread)orLVU800‐3N80(4”threadx2”thread).

Beam Angle:LVU‐301/‐303 Series features an 8° beam angle.As the distance to the liquid increases, the

beam will increase in size.Keep any objectthat can interfere with the sound pulses (ex: side wall, ladders,

mixingblades,etc.)outsideofthisbeamangle.Usethedataprovidedtosizethefootprint

ofthesoundpulse.

Depth Radius Radius  Depth Radius Radius Depth Radius Radius

1’ 1.2” 3.1cm 10’ 8.8” 22.3cm 19’ 16.3” 41.3cm

2’ 2.1” 5.2cm 11’ 9.6” 24.4cm 20’ 17.2” 43.6cm

3’ 2.9” 7.3cm 12’ 10.4” 26.5cm 21’ 18.0” 45.7cm

4’ 3.7” 9.5cm 13’ 11.3” 28.7cm 22’ 18.8” 47.8cm

5’ 4.6” 11.6cm 14’ 12.1” 30.8cm 23’ 19.7” 50.0cm

6’ 5.4” 13.7cm 15’ 13.0” 32.9cm 24’ 20.5” 52.1cm

7’ 6.2” 15.9cm 16’ 13.8” 35.1cm 25’ 21.4” 54.2cm

8’ 7.1” 18.0cm 17’ 14.6” 37.2cm  

9’ 7.9” 20.1cm 18’ 15.5” 39.3cm  

 13

INSTALLATION StepSeven

FittingSelection:LVU‐301/‐303Seriesiscommonlyinstalledintankadapters,flanges,bracketsor standpipes.

1. Tank Adapter:Select a  tank adapter

fitting, such as the LVU800‐2B for the

LVU‐301/‐303series.

a. Avoid tank adapter (thread x

thread)styles and/orpipestops

forward of the installed

transducer.

a. For larger tank adapters, it is

OK to use a reducer bushing

such as the LVU800‐2N80 (3”

threadx2”thread).



2. Riser:Installationswithtall,narrowriserscanimpedetheacousticsignal.

a. 2”(5cm)diameterrisersshouldbenotallerthan3”(7.6cm).Largerdiameterrisersshouldbe

notallerthan12”(30.5cm).



RiserSpecifications

InnerDiameter MaximumHeight

3”~(75mm)

4”~(100mm)

5”~(125mm)

6”~(150mm)

7”~(175mm)

8”~(200mm)

3”~(75mm)

7”~(175mm)

10”~(250mm)

12”~(300mm)

14”~(350mm)

16”~(400mm)

Note:Donotexceedthedimensionslistedabove

3. Flange:If installingon a flange,selectaflange with a thread that is equal to the thread of theLVU‐

301/‐303Series.

a. Whenusingaflangewithariser,pleaseobservetheriserdimensionalinformationabove.

b. Ifthe size of the flange is largerthanthethreadofthesensor,

 use areducer bushing to help

mountthesensor.





2”TankAdapter

SocketxThread

TankAdapter

ThreadxThread



Donotusethreadxthread

14

INSTALLATION StepSeven

4. Side Mount Bracket:  For installations in open tanks and sumps, use the LVM‐30 series side mount

bracket.

a. Be aware of the 8° beam angle with the LVU‐301/‐303 Series

transmitter.

b. Use the Beam Width data to avoid having the sensor’s beam

awayfromthesidewall.



5. Stand Pipe:A standpipe maybe used to dampen turbulence or when foam is present in the

application.

a. Pipecanbemadeofanymaterial.

b. Selectaminimum2”IDpipeforthestandpipe.

i. Alargerdiameterpipecanbeused.

c. UseacouplingandreducerbushingtoattachtheLVU‐301/‐

303Seriestothepipe.

d. Thepipelength shouldrun themeasurementspanandthe

bottomofthepipeshouldremainsubmergedatalltimesto

preventfoamfromenteringthepipe.

e. The pipe must be a continuous length with no joints,

couplingsorextensions.

f. Cut a 45°notch at the bottom of the pipe and drill a 

1/4”pressureequalizationholeinthedeadband.

i. The vent hole must be within the dead band of the

LVU‐301/‐303Series.

g. Thepumpsshouldnotdriveliquidpasttheopenendofthe

standpipewhichcausestheliquidinthepipetooscillate.





 15

RELAYEXAMPLES StepEight

InternalRelay:TheLVU‐301/‐303seriescontainsa250VAC,10Ainternalrelay.Therelayisactuatedbythe

HSETandLSETsettings.Whilethismanualofferssomeexampleandsuggestionstohelpexplaintheoperation

oftherelay,suchexamplesareforinformationonlyandarenotintendedasacompleteguidetoinstallingany

specificsystem.

Ex: High Level Alarm:The goal is to make sure the

liquiddoesnotriseaboveacertainlevelinthetank.Ifit

does, an alarm sounds alerting the operator to a high

level condition.Wire a lead of the alarm to the Green

NC relay wire.Power is wired to the Blue COM relay

wire and to the other lead of the alarm to complete the loop.Please observe

polaritywiththealarm.

Make sure the HSET and LSET settings are programmed correctly.Typically the

valuesaresettothesamedistanceawayfromthe sensor.ForHighAlarms,setthe

HSETvaluefirstbeforesettingtheLSETvalue.

Inthenormaloperationstate,thesensor’srelaywillremainenergized,keepingthe

alarmcircuitopen.Whenthealarmlevelhasbeenreached,therelayde‐energizes

andactivatesthealarm.Tochangetoalowlevelalarm,re‐wirethealarmfromthe

GreenNCwiretotheYellowNOwireandadjusttheLSETandHSETtotherequiredlevelinthe tank.

Ex:AutomaticFill:Thegoalistofillthetank.Avalveis

opened (energized) when a low level is reached and

closed(de‐energized)whenahighlevelisreached.Wire

a lead from the valve to the Yellow NO wire.Power is

wiredtotheBlueCOMrelaywireandtotheotherleadof

thevalvetocompletetheloop.Pleaseobservepolaritywiththevalve.

Make sure the HSET and LSET settings are

 programmed correctly.Typically they

aresetwiththeHSETasthevalueclosesttothesensorandtheLSETasthevalue

farthestaway.In aFill operation,theHSETwillalwaysbethelevel wherethe fill

stops and LSET will be the level where the fill starts.When the low level is

reache

d,thesystemwillstarttofillthetank.Thetankwillcontinuetofilluntilthe

levelreachesthehighpoint.Thesystemstopsfillinguntilthelowlevelisreached

again.Apumporsolenoidcanbesubstitutedfortheexactsameoperation.

Tochangetoanautomaticemptyapplication,re‐wirethesystemfromtheYellowNOwiretheGreenNCwire

andadjusttheLSETandHSETtotherequiredlevelinthetank.





16

MAINTENANCE/ADVANCEDFEATURESStepNine

General:LVU‐303/‐303seriessensoritself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 sensor, controller and/or power supply is completely

disconnected.

2. Sensor 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Sensor:Useasoftbristlebrushandmilddetergent,carefullywashthesensor.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PolypropyleneorPVDFplasticbody.

FactorySettingand Factory Reset:The LVU‐303/‐303series is presetatthe factory.Whenpowered up the

transmitterthefirsttime,thefactorysettingwillbeactive.Ifatanytimeyouneedtoreturntothesesettings,

remove power from the sensor and wait 10 seconds. Press the [SET] and [MENU] buttons simultaneously

whilepoweringupthetransmitter.

LEVL INCHES(cm) SAF_ SAF1

EC4 288”(731.2cm)FAST/SLOW FAST

EC20 8”(20.3cm) ALIN N/A

RLAY N/AOFF/ON OFF

HSET 5”(12.6cm) TANK N/A

LSET 288”(731.2cm) Value 216”(548.6cm)



ChangingDisplayUnits:The LVU‐301/‐303 seriescomespresettomeasureininches.Tochangethe unitto

display centimeters, remove power to the sensor and wait 10 seconds.Press [∆] and [SET] simultaneously

while powering up the  transmitter.The sensor will now read in centimeters.To return to inches, remove

powerandwait10seconds.Press[]and[SET]simultaneouslywhilepoweringupthetransmitter.

TestingtheTransmitter

SourcingTransmitter(LVU‐303Series) SinkingTransmitter(LVU‐301Series)

1. Connectamultimeterinserieswiththewhitewiretoreadthecurrentoutput.

a. Besuretoobserveintheexamplesabovewhere

theothersideofthemultimeterisconnected.

2. Verify that the current increases (tank filling) and decreases (tank emptying) appropriately in the

calibratedspan.

If not, carefully observe and attempt to correlate any installation, level or application event for more specific

troubleshootingdirection.



 17

TROUBLESHOOTING StepTen

PROBLEM SOLUTION

Transmitterindicatesa

currentof0mA

Check the wiring for an open circuit (specifically the White wire).An

opencircuitisthemostcommonissuewitha0mAsignal

Transmitterjumpstoa

currentreadingbetween

19and20mA

Check the installation of the transmitter.Bad installation fittings will

cause false signals near the top of the tank, which typically translates

to a signal between 19 and 20 mA.Also look for interference just

belowthe transmitter.Ifthe  transmitterisinst

alledinametalfitting,

switchtoaplasticfitting.

Transmitterindicatesa

currentover20mA

Immediately check the wiring for a short circuit.The LVU‐301/‐303

Seriesiscurrentlimitedto20mA.Anythingabove 20 mA indicates a

shortcircuit.

Transmitteralwaysjumps

toLOSTcondition

AreadingofLOSTinthedisplayofthesensor indicatesthetransmitter

isnotreceivingavalidreturnsignal.IfLOSTappears,pleasecheckthe

followingtroubleshootingitems:

1. Beamconeinterferencesuchasthesidewall,ladder,seams,rungs

orpipeswithinthesensor’sbeamcone.

2. Proper installation such that the LVU

‐301/‐303 series is installed

level and free from interference from the installation fitting or

flange.

3. Sufficient power being supplied to the LVU‐301/‐303 series. The

sensorrequires14‐36VDCpowerwithaminimumsupply200mA.

4. ProperProgrammingoftheTANKfunction.Forbestresults,setthe

TANK function as the distance from the bottom of the tank tothe

bottomofthetransmitter.

5. Makesurethatthetransmitterisnotinstalledatanangle.Evena5

degreeoffsetcanreducethesignalreturnstrengthgreatly.

Outputoftransmitteris

oppositeofthelevelof

liquid

ChecktheEC4

EC20Setting. 

 For4mAatemptytankand20mAatfulltank,theEC4mustbe

thelargervalueandtheEC20tosmallervalue.

 For20mAatemptytankand4 mAatfulltank,theEC20 must

bethelargervalueandtheEC4tosmallervalue.

Outputofthetransmitter

isalwaysreadingeither

4mAor20mA

Check the input settings (EC4 and EC20) for the transmitter.The

display of the transmitter reads to the 1/10

 of an inch or cm.

Example:adisplayof1234is123.4”andnot1234”.





18

TROUBLESHOOTING StepTen



PROBLEM SOLUTION

Thedisplayonthe

transmitterdoesnot

matchthedisplayonthe

sideofthetank

Thedisplayfor theLVU‐301/‐303Series will alwaysshowthe distance

from the liquidsurfaceto the bottom of the sensor (in inches or cm).

The 4‐20 mA output can be scaled to read in any engineering units,

thusthedisplayswillnevermatchunlessthelocaldisplayisconfigured

toreadtheairgapinthetank.

Sensorappearstohave

resetitself

CheckthesettingsforEC4&EC20.Rememberthatthefirstvalueseen

inEC4&EC20isthecurrentdistancefromthesensortotheliquid.

1. TocheckEC4setting:

a. PressMENUuntilEC4appears.

b. Waituntilanumberappears.

c. Immediatelypressthe∆button&theEC4settingwillappear.

2. TocheckEC20setting:

a. PressMENUuntilEC20appears.

b. Waituntilanumberappears.

c. Immediatelypressthe∆button&theEC20settingwillappear.

DisplayreadsCM8Qor

CM8O

These are actually firmware codes for the sensor.The appearance of

eithercodeindicates thatthesensoris stuck inareboot stage due to

thepowerflickeringonandoff.Checkthatthepowerbeingsuppliedis

consistentanddoesnotflickeroff.Alsocheckthewireconnectionsat

theterminals.



Other Hints:Current must change with all level movement. Example: For the

illustrationshown,aslevelincreases,thecurrentoutputwillincrease.Iftheoutput

oftheLVU‐301/‐303seriesisalwaysreading4mAor20mA,checktheinputvalues

(EC4andEC20)forthesensor.

ThedisplayontheLVU‐301/‐303 Serieswillalwaysindicate thedistancefrom the

bottom of the sensor to the surface of the liquid (in units of either 1/10 inch or

1/10cm).Astheliquidlevelincreases,thevalueonthedisplaywilldecrease.As

theliquidleveldecreases,thevalueonthedisplaywill increase.



 19

20



Omega LVU-301 & LVU-303 Series Owner's manual

Omega LVU-301 & LVU-303 Series Owner's manual

Omega LVU-301 & LVU-303 Series Owner's manual

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