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INTRODUCTION/TABLEOFCONTENTS StepOne
The general‐purpose flow controller is offered in two configurations for low‐flow pump and process
protection.The LVCN‐141 Series accepts one flow sensor input and provides one 10A relay for low flow
control.The LVCN‐131Seriesacceptstwo flow sensor inputs and providestwo10Arelays for dual low flow
control.Packagethisflowcontrollerwithourliquid or gas flow switch sensors.For field mount installation,
addasingleordualcontrollerNEMAbox.
Features
Fail‐Saferelaycontrolofpumps,valvesoralarmswitha0to60seconddelay.
EasysetupwithLEDindicatorsforsensor(s),powerandrel
35mmDINrailmountpolypropyleneenclosurewithremovableterminalstrips.
InvertswitchchangesrelaystatefromNOtoNCwithoutrewiring.
ACpowered
TableofContents
Specifications:.........................................................................................................................................................4
Dimensions:.............................................................................................................................................................4
SafetyPrecautions:.................................................................................................................................................5
Components:...............................................................................................................................................5
MakeaFail‐SafeSystem:............................................................................................................................6
ControllerLogic:..........................................................................................................................................6
GettingStarted:.......................................................................................................................................................7
GuidetoControls:.......................................................................................................................................7
Elect
rical..................................................................................................................................................................8
VACPowerInputWiring:............................................................................................................................8
RelayInputWiring:.....................................................................................................................................8
Changingfrom120to240VAC...................................................................................................................8
Wiring:.....................................................................................................................................................................9
ConnectingSwitchestoInputTerminals:...................................................................................................9
Installation..............................................................................................................................................................9
ApplicationExamples............................................................................................................................................10
LEDIndication:..........................................................................................................................................10
LowFlowAlarm:........................................................................................................................................11
DualFlowAlarms:.....................................................................................................................................11
FlowSwitchCalibration:.......................................................................................................................................12
SetPoints:.................................................................................................................................................12
Appendix...............................................................................................................................................................13
ControllerLogic.........................................................................................................................................13
Troubleshooting........................................................................................................................................13
RelayLatchLogic(LVCN‐131Seriesonly).................................................................................................14
aystatus.
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SPECIFICATIONS/DIMENSIONS StepTwo
Supplyvoltage: 120/240VAC,50‐60Hz.
Consumption: 5Wattsmax.
Sensorinputs: LVCN‐141:(1)flowswitch
LVCN‐131:(2)flowswitches
Sensorsupply: 24VDC@100mA
LEDindication: Sensor,power&relaystatus
Contacttype: LVCN‐141:(1)SPDTRelay
LVCN‐131:(2)SPDTRelays
Contactrating: 250VAC@10A
Contactoutput: SelectableNOorNC
Contactdelay: 0to60seconds
Electronicstemp.: F:‐40°to158°
C:‐40°to70°
Enclosurerating: 35mmDIN(EN50022)
Enclosurematerial: PP(U.L.94VO)
Failsafety: Powerfail‐safe
Classification: Generalpurpose
Compliance: CE:EN61326EM/EN61010‐1
Safety
LVCN‐141seriesfaceplate:1sensorinput,1relayoutput.
TopView
SideView
LVCN‐131seriesfaceplate:2sensorinput,2relayoutputs.
Onerelayforeachsensorinput.
The LVCN‐131 Series can also be used as a level controller
with 3 sensor inputs and 2 relay outputs.One relay is
latchingandtheotherisasingleinputrelay.
InternalControllerLogic
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SAFETYPRECAUTIONS StepThree
AboutThis Manual:PLEASEREADTHEENTIREMANUALPRIORTOINSTALLINGORUSINGTHISPRODUCT.
This manual includes information on three different models of Remote Relay Flow Controllers from
OMEGA ENGINEERING: LVCN‐141 and LVCN‐131 series.Many aspectsof installation and use are similar
betweenthethreemodels.Wheretheydiffer,themanualwillnoteit.Pleaserefertothepartnumberon
thecontrolleryouhavepurchasedasyouread.
User’s ResponsibilityforSafety:OMEGAENGINEERINGmanufactures several models of controller, with
differentmountingandswitchingconfigurations.Itistheuser’sresponsibilitytoselecta controllermodel
that is appropriate for the application, install it properly, perform tests of the installed system, and
maintainallcomponents.
Electrical Shock Hazard:It is possible to contact components on the controller that carry high voltage,
causing serious injury or death.All power to thecontroller and the relay circuit(s) it controls should be
turned OFF prior to working on the controller.If it is necessary to make adjustments during powered
operation,use extremecautionanduseonlyinsulatedtools.Makingadjustmentstopoweredcontrollers
isnotrecommended.Wiringshouldbeperformedbyqualifiedpersonnelinaccordancewithallapplicable
national,stateandlocalelectricalcodes.
Flammable or Explosive Applications: The entire LVCN‐131/‐141 series remote mount flow controllers
should not be used with explosive or flammable liquids, which require an intrinsically safe or explosion
proof.If you are unsure of the suitability of a controller for your installation, consult your Omega
Engineeringrepresentativeforfurtherinformation.
InstallInaDryLocation:Thecontrollerhousingisnotdesignedtobeimmersed.Wheninstalledproperly,
itshouldbemounted in suchaway that it doesnotnormallycome into contactwithliquid.Referto an
industryreferencetoensurethatcompoundsthatmaysplashontothecontrollerhousingwillnotdamage
it.Suchdamageisnotcoveredbythewarranty.
RelayContact Rating:Therelay isratedfora10ampresistive load.Manyloads (suchas amotorduring
start‐uporincandescentlights)arereactiveandmayhave aninrushcurrentcharacteristicthatmaybe 10
to 20 times their steady‐state load rating.The use of a contact protection ci
yourinstallationifthe10ampratingdoesnotprovideanamplemarginforsuchinrushcurrents.
Components:
LVCN‐141‐SingleInput,SingleRelayOutput120VACFlow/No‐FlowController
LVCN‐141‐CE‐SingleInput,SingleRelayOutput120VACFlow/No‐FlowControllerw/CECompliance
LVCN‐131‐DualInput,DualRelayOutput120VACFlow/No‐FlowController
LVCN‐131‐CE‐DualInput,DualRelayOutput120VACFlow/No‐FlowControllerw/CECompliance
Owner’sManual
rcuit may be necessary for
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SAFETYPRECAUTIONS(cont.) StepThree
Make a Fail‐Safe System: Design a fail‐safe system that accommodates the possibility of relay or power
failure.If power is cut off to the controller, it will de‐energize the relay.Make sure that the de‐energized
stateoftherelayisthesafestateinyourprocess.Forexample,ifcontrollerpowerislost,apumpfillingatank
willturnoffifitisconnectedtotheNormallyOpensideoftherelay.
While the internal relay is reliable, over the course of time relay failure is possible in two modes: under a
heavyload thecontacts maybe “welded”or stuckinto theenergized position,or corrosionmay buildupona
contact so that it will not complete the circuit when it should.In critical applications, redundant backup
systems and alarms must be used in addition to the primary system.Such backup systems should use
differentsensortechnologieswherepossible.
Whilethis manualofferssomeexamplesand suggestionsto helpexplainthe operationofOMEGA ENGINEERING
products, such examples are for information only and are not intended as a complete guide to installing any
specificsystem.
ControllerLogic:
LVCN‐141 Series:The LVCN‐141 series features a
singlesensorinputandasinglerelayoutput.Connect
theswitch inputtoInput1terminal.Wirethedevice
youwanttocontroltoRelay1terminal.
LVCN‐131 Series:The LVCN‐131 series features a
three(3) sensorinputsandatwo(2)relayoutput.In
amajorityofapplications,theLVCN‐131serieswillbe
used as a 2 input /2 relay output controller.In this
case, Sensor Input 1 directly controls Relay 1 and
SensorInput2AdirectlycontrolsRelay2.
Note:IfthelatchswitchisturnedON,thenRelay2requiresbothInputs2A&2Btobeinthesamestatebeforeit
willswitch.Thisrelay logicisideal forautomaticfilling oremptyingof tanks andisnot usedforflow /no‐flow
applications.If using the LVCN‐131 series as a flow / no‐flow controller, make sure the Latch switchisturned
OFF.
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GETTINGSTARTED(continued) StepFour
TheLVCN‐131/‐141Seriesmaybeusedwithalmostany OmegaEngineeringflowwitharelayoutput(FST‐200
& FST‐300 Series).The relay isasingle pole, double throw type; the controlled device can be connected to
eitherthenormally open ornormallyclosedside of therelay.Atime delayfrom0to 60secondscanbe set
before the relay responds to the sensor input.Typical applications for the LVCN‐131/‐141 Series are pump
protection,no‐flowindicationorchemicalinjection.
GuidetoControls:Belowisalistingandthelocationofthedifferentcomponentsforthecontroller:
1. Powerindicator:ThisgreenLEDlightswhenACpoweris
ON.
2. Relay indicator: This red LED will light whenever the
controllerenergizes therelay, inresponsetotheproper
conditionatthesensorinput(s)andafterthetimedelay.
3. AC Power terminals: Connection of 120 VAC power to
thecontroller.Thesetting may be changedto240 VAC
ifdesired.Thisrequireschanging internal jumpers; this
is covered in the Installation section of the manual.
Polarity(neutralandhot)doesnotmatter.
4. Relay terminals (NC, C, NO): Connect the device you
wishtocontrol (pump,alarmetc.) totheseterminals:supply totheCOM terminal,andthedevice tothe
NOorNC terminalasrequired.The switcheddeviceshould beanon‐inductive loadofnotmore than10
amps;for reactiveloadsthecurrentmustbederatedorprotection circuitsused. Whenthe redLEDis ON
andtherelayisintheenergizedstate,theNOterminalwillbeclosedandtheNCterminalwillbeopen.
5. Time delay: Use potentiometer to set delayfrom 0.15 to 60 seconds.Delay occurs during switch make
andswitchbreak.
6. Inputindicators:Use theseLEDsfor indicatingFloworNo‐Flowstatus ofswitch.WhenswitchisClosed,
LEDwillbe Amber.When switchisOpen, LED willeitherbeOFF.Note: Consult themanualforthe flow
switchtodetermineexactwiringaswellasswitchpolarity(OpenorClosedduringFlow).
7. Invertswitch:Thisswitchreversesthelogicoftherelaycontrolinresponsetotheswitch:conditionsthat
usedtoenergizetherelaywillnowde‐energizetherelayandviceversa.
8. Latchswitch (LVCN‐131seriesonly):This switchdetermineshow therelay willbeenergizedinresponse
toeitheroneinput(Input2A)ortwoinputs(Inputs2Aand2B).WhenLATCHisOFF,therelayrespondsto
sensorInput2Aonly;whenLATCH is ON, the relay will energizeorde‐energizeonlywhen both switches
(2A and 2B) are in the same state (both open or both closed).Note:In a majority of flow / no‐flow
applications,thelatchwillbeturnedOFF.
9. Inputtermi
thereturnpathfromthesensorand(S)isapoweredswitchinput(14VDC,25mA).Consulttheflowswitch
manualforswitchpolarity(Ex:OpenorClosedforFlow)aswellaswiringinformation.
nals:Connecttheswitchwirestotheseterminals:(+)isa24VDC,100mApowersupply,(‐)is
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ELECTRICAL StepFive
VACPowerInputWiring:ObservethePOWERSUPPLYlabelontheLVCN‐131/‐141series.Thelabelidentifies
thepowerrequirement(120or240VAC)andtheterminalwiring.Note:PolaritydoesnotmatterwiththeAC
inputterminal.
RelayInputWiring:Therelayisadry‐contactsinglepole,doublethrow(SPDT)typeratedat250VAC,10Amps.
Therelayisdesignedtoswitchpoweronandofftoadevice.Thereisnoactivepowerwithintherelaycontacts
alone.Powermustbeintroducedfromsecondarysourceorfromthepowerbeingusedbythecontroller.
Powerfromasecondarysource
The two terminal Normally Open (NO) and Normally Closed (NC) will be used in
differentapplications.Rememberthatthe"normal"stateiswhentherelaycoilisde‐
energized and the Red relay LED is Off / de‐energized.Both terminals share the
Common(C)terminal.Whenrelayisde‐energized,CtoNOwillbeopenandCtoNC
will be closed.When relay is energized, C to NO will be closed and C to NC willbe
open.Ifpowerisremovedtothe controller, the relay willreturntoa de‐energiz
state.
Powerfromthesamesourceasthecontroller
ed
Changingfrom120to240VAC:
1. Remove the back panel of the controller and
gently slide the printed circuit board from the
housing.UsecautionwhenremovingthePCB.
2. LocatedjumpersJW1,JW2andJW3onthePCB.
3. Tochange to240 VAC,removejumpersfrom JW1
andJW2an
changeto120VAC,removejumperJW3andplace
jumpersacrossJW1andJW2.
4. Gently return PCB into housing and replace back
panel.
8
dplaceasinglejumperacrossJW3.To
120VAC 240VAC
Configuration Configuration
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WIRING/INSTALLATION StepSix
Connecting flow switches to input terminals:The type of flow switch from Omega Engineering that is
compatible with the LVCN‐131/‐141 series of controller is either the FST‐200 or FST‐300 series.The flow
switches have a relay outputand 4 wires as the output (Red, Black, Green and White).Seethe illustration
below toindicatewiring for your switchandthepolarityoftheswitch output.Note: the Shield wire will be
usedonlyforlongcablerunsorwhereexcessiveelectricalnoiseispresent.
StandardRelayOutputFlowSwitches
PanelDINRailMounting:Thecontroller may be mounted by eitheraback panel using two screwsthrough
mountingholeslocatedatthecornersofthecontrollerorbysnappingthecontrolleron35mmDINRail.
Note:Alwaysinstallthecontrollerinalocationwhereitdoesnotcomeintocontactwithliquid.
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APPLICATIONEXAMPLES StepSeven
LEDIndication:UseLED'slocatedabovetheinputterminalstoindicatewhethertheswitchisinaFloworNo‐
Flow state. With the flow switch wired NC, the Amber LED indicates No‐Flow and no LED indicates flow.
WiringtheswitchNO(reversingtheRedand Blackwires),theAmberLEDindicatesFlowandnoLEDindicates
No‐Flow.
NCWiring
AmberLED
NCWiring
LEDOFF
NOWiring
AmberLED
NOWiring
LEDOFF
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APPLICATIONEXAMPLES StepSeven
LowFlow Alarm:Thegoalis toindicate whentheflow ratefalls belowacertainpoint.If itdoes, analarmis
supposedtosound,alertingthe operatorofalowflow condition.Theflowswitchiswired toInput1andthe
alarmiswiredthroughRelay1.
Ifpowerisaccidentallycuttothecontroller,thesensor'sabilitytonotify
the operator of a low flow condition could be lost.The system must
alerttheoperatornotonlytolowflow,buttocontrollerpowerloss.To
do this, connect the hot lead of the alarm to the NC side of the relay
terminal of the controller.If power is lost, the relay will be de‐
energized,andthealarm will sound (ifthereisstill power tothealarm
circuit itself).The alarm circuit should have a non‐interruptible power
supply or some other indicator or backup alarm to warn of a power
failureinthealarmcircuit.
In this application, thenormal status is when the sensor is in the flow
condition, and the relay will be energized holding the alarm circuit
Open.
IftheswitchiswiredNC,the inputLED willbeOFFandtherelay
LEDwillbeON.Soforthiswiringconfiguration,Invertshouldbe
settotheONposition.
IftheswitchiswiredNO,theinputLEDandtherelayLEDwillbe
ON simultaneously.So for this wiring configuration, Invert
shouldbesettotheOFF(‐)position.
DualFlowAlarm:Thegoalisto indicatewhentheflowratefallsbelow
acertainpointontw o differentlines.Ifitdoes,analarmis supposedto
sound,alertingtheoperatorofalowflowconditionforthespecificline.
For Line #1, the flow switch is wired to Input 1 and theal
through Relay1.ForLine#2,theflowswitchiswiredtoInput2Aand
thealarmiswiredthroughRelay2.
Accidentalpowercuttothecontrollermust betakenintoaccountas in
theLowFlowAlarmexampleseenabove.FollowthesamelogicforLow
FlowAlarmaswithDualFlowAlarm.
In this application, thenormal status is when the sensor is in the flow
condition, and the relay will be energized holding the alarm circuit
Open.
If the switches are wired NC, theinput LED will be OFF an
relay LED will be ON.So for this wiring configuration, Invert
shouldbesettotheONposition.
arm is wired
d the
IftheswitchesarewiredNO,theinputLEDandtherelayLEDwill
be ON simultaneously.So for this wiring configuration, Invert
shouldbesettotheOFF(‐)position.
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FLOWSWITCHCALIBRATION StepEight
Set Points:Ifthepresetfactorycalibrationisnotadequateforyourapplication,followthecalibrationsteps
listedbelow.Note:theswitch'sinternalLEDwillbeon whentheswitchdetectsno‐flowandwilloffwhenthe
switchdetectsflow.
1. Install the fitting and flow switch as described in the Installation section of this manual.Turn the flow
switchandcontrollerpoweronandadjusttheflowrateto the application setting.If the medium to be
sensedislikely tobesubject tohightemperaturevariations, theflowswitch shouldbesetat thehighest
normaltemperaturelikelytobeencountered.
2. Locatethe potentiometer knob at the top of the flow switch.The red LED is
visible through the potentiometer.(If the LED is on, slowly adjust the
potentiometer counterclockwise, with a small flat head screwdriver until the
LEDturnsoff.)The adjustmentisasingle turn270°potenti ometer.The initial
response time of the flow switch after adjustment is 1to 10 seconds.Adjust
thepotentiometerinslow increments andwaitforthe response.If the LED is
off, slowly adjust the potentiometer clockwise until the light tur ns on.Then
turn the potentiometer counterclockwise to bring the LED off at a reliable
setting.Remember,adjustthe potentiometerin slow increments andwaitfor
theresponse.
3. Verifythatthenewcalibrationiscorrectbyloweringthesystemflowratebelowthe
setpointand check toseethatthered LED turns on.Then increasetheflowrate
abovethesetpointandverifythattheredLEDturnsoffaccordingly.
LiquidSwitch
FST‐200Series
GasSwitch
FST‐300Series
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APPENDIX StepNine
ControllerLogic:Pleaseusethefollowingguidetounderstandtheoperationofthecontrollers.
1. PowerLED:MakesuretheGreenpowerLEDisONwhenpowerissuppliedtothecontroller.
2. InputLED:ForNCswitchwiring,theinputLEDonthecontrollerwillbeAmberwhentheswitchreadsno‐
flowandOFFwhentheswitchreadsflow.
3. InvertOperation:Whenthe input LEDturnOFFand ON, the relay LEDwillalsoswitch.WithinvertOFF,
therelayLEDwillbeONwhentheinputLEDisONandOFFwhentheinputLEDisOFF.WithinvertON,the
yLEDwillbeOFFwhentheinputLEDisONandONwhentheinputLEDisOFF
rela
.
4. RelayOperation:TherelaymaybewiredeitherNOorNC.ThenormalstateoftherelayiswhenitsLEDis
OFF.WiththeLEDON,therelayisintheenergizedmodeandallterminalconnectionsarereversed.
Troubleshooting:
PROBLEM SOLUTION
Controllerispowered,butnothing
happens.
FirstcheckthePowerLEDtomakesureitisGreen.Ifnot,check
the wiring, power and make sure the terminal is seated
correctlyoverthe6‐pins.
A Flow or No‐Flow condition is
metbuttherelaydidnotswitch.
The Flow or No‐Flow is not
switchingatthecorrectflowrate.
Check the relay by switching the invert switch.Confirm that
relayclickonandoffaswellastherelayLED.
The flow switch may need to be adjusted.Review the Flow
SwitchCalibration sectiononthepreviouspageforinstructions
on setting the actual flow switch.Note: access to the flow
switch adjustment is difficult and requires the removal of the
PCBassembly.Usecautionwhenperformingthisstep.
Trying to start the flow but the
controller keeps turning the flow
off.
Torestartaflowcondition,thesensorneedstosenseanactual
flow condition before changing the relay in the controller.A
flow switch over‐ride may need to be added across the relay
contacts that allows for a true flow to occur before switching
back to the controller.The use of a moment switch is
recommendedfortheover‐rideswitch.
RelayLEDdoesnotmatchmyflow
condition.
TherelayLEDcanbeswitchedbyeitherthereversingthewiring
of the sensor to the controller or by flipping the invert switch.
This means that the relay LED can either be set to turn on
during a flow condition or to tu
rn off during a no‐flow
condition.This is all dependent on the wiring and the invert
position.
Relay LED does not match the
sensor’sLEDindicator.
Thesensor’s LEDwill alwaysbe ONduring aNo‐Flow stateand
OFF during a Flow state, regardless oftheswitcheswiring.As
per above the input LED can be inverted to any condition.In
some applications, they will match and in others they will be
opposite.This is all dependent on the application
parameter/setup.
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APPENDIX StepNine
RelayLatch Logic(Relay2,LVCN‐131 Seriesonly):The relaycan either
be an independent relay (high or low level alarm) or a latching relay
(automatic fill or empty) with latch ON.With Latch OFF, the relay will
only respond to the Input 2A.Input 2B will be ignored.This
configurationisidealforalarming,suchasflow,no‐flow,leakdetection,
highlevelorlowlevel.
WhentheLatchswitch is ON,Relay2 requires that bothInputs2Aand
2Btobeinthesamestatebeforetherelaywillswitch.
Inanautofillapplication, when the bottom switchisdry(top switch is
also dry) the relay will energize.The relay will remain in anenergized
stateuntilthetop switch becomeswet(bottom switchisalso wet).At
this point, the relaywillde‐energizeandremainde‐energizeduntilthe
bottomswitchbecomesdryagain.
Thesamelogic appliesforauto empty applications.Theonlychange is
thattherelaywill energizewhenthetopiswet(bottomisalsowet)and
de‐energizewhenthebottomisdry(topisalsodry).
Inbothscenarios,whenthe levelisbetweenthetwo sensors,therelay
willnotchangestate, regardless of istheliquidis rising or falling.This
logicisidealforthecontrollingofliquidbetweentounique/differentset
points.Thedifferentialiscontrolledbythelocationofthetwosensors.
With Latch ON, the relay will
actuate when Input 2A and Input
2Bare inthesamecondition.The
relay will not change its condition
InvertOFF LatchOFF
Input2A Input2B Relay
ON
OFF
NoEffect
NoEffect
ON
OFF
until both inputs reverse their
state.
Caution:Some sensors may have
their own inverting capability
(wiredNOorNC).Thiswillchange
the logic of the invert switch.
Checkyoursystemdesign.
InvertOFF LatchON
Input2A Input2B Relay
ON
OFF
ON
OFF
ON
ON
OFF
OFF
ON
NoChange
NoChange
OFF
InvertOFF LatchOFF
Input2A Input2B Relay
ON
OFF
NoEffect
NoEffect
OFF
ON
InvertON LatchON
Input2A Input2B Relay
ON
OFF
ON
OFF
ON
ON
OFF
OFF
OFF
NoChange
NoChange
ON
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