Dwyer Series TDS User manual

Brand: Dwyer

Model: Series TDS

Type: User manual



90640A



Seri

Flo

Own

DwyerI

102In

(P.

chiganCity,

www.



es

Swit

r’sMa



struments

ianaHwy.

.Box373)

IN46360(

wye

‐Inst.c



DS

ch

ual

Inc.

12



6361)USA

m



1of1



2of12  MN890640A

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

Offered in liquid and gas sensor types, the general purpose flow switch provides reliable low or no‐flow

detectionofrelativelyclean,non‐coatingmediawithone1Arelayoutput.Liquidexamplesincluedwaterand

aceticacid.AvailableinPolypropylene‐Ryton®orPVDF,theshortflowsensorisusedinpipeorductingfrom

½”to1‐1/2”,andthelongflowsensorisusedin2”andup.Theflowswitchsetpointmaybeadjustedfrom

0.04to3fpsinliquidsor1to90fpsingasesasalow‐flowalarm.Theflowsensorisbestappliedin

applicationswithrelativelyconstanttemperatures.

NewFeatures

 RuggedPolypropylene‐Ryton®orPVDFsensorforcorrosiveliquidsandgasses.

 AdjustablesetpointwithLEDforfloworno‐flowstatusindication.

 60VArelayselectableNOorNCviapowersupplywiringpolarity

 SolidStatesensorisnotdamagedbyover‐rangingflowvelocities.

MakeaFail‐SafeSystem:Designafail‐safe system thataccommodates the possibility of switchand/or

power failure.  Dwyer Instruments recommends the use of redundant backup systems and alarms in

additiontotheprimarysystem.Addingaredundantalarmswitchtothesystemisacosteffectivemeans

topreventcostlyrun‐dryissues.

TableofContents

Specifications:.........................................................................................................................................................3

 Dimensions:.................................................................................................................................................3

SafetyPrecautions:................................................................................................................................................4

Introductions:..........................................................................................................................................................5

 Configurations:............................................................................................................................................5

 Technology:.................................................................................................................................................5

Installation:.............................................................................................................................................................6

Wiring:.....................................................................................................................................................................7

 WiringtoaDwyerInstruments:.................................................................................................................7

 WiringtheRelayoutput:.............................................................................................................................8

 WiringasaP‐ChannelorN‐ChannelOutput:.............................................................................................9

Calibration:............................................................................................................................................................10

 SetPoint:...................................................................................................................................................10

Maintenance: .......................................................................................................................................................11

 CleaningProcedure:..................................................................................................................................11

 TestingtheSensor(TDSSeriesOnly):.......................................................................................................11

Warranty:..............................................................................................................................................................12





MN890640A  3of12

SPECIFICATIONS/DIMENSIONS StepOne

Setpointrange: .04to3fps/(.012to.91mps)

Factorysetpoint: .2fps(.06mps)

Repeatability: ±.5%ofsetpoint@fixedtemp.

Responsetime: 1‐10seconds

Setpointadjust.: Potentiometer

LEDindication: FlowStatus

Viscosityrange: 1‐200centipoise

SupplyVoltage: 14‐36VDC

Consumption: 70mAmaximum

Contacttype: (1)SPSTrelay

Contactrating: 60VA,1Amax

Contactoutput: SelectableNO/NC

Processtemp.: F: 32°to140°/C: 0°to60°

Electronicstemp. F: ‐40°to140°/C: ‐40°to60°

Pressure: 150psi(10bar)@25°C.,derated@1.667

psi(.113bar)per°C.Above25°C.

Sensorrating: NEMA4X(IP65)

SensorMaterial: TDS1_2:PP‐Ryton®

 TDS2_2:PVDF

Cablejacketmat.: TDS1_2:PP

 TDS2_2:FEP

Cabletype: 4‐conductor,#22AWG(shielded)

Cablelength: Standard:10’(3m)

Processmount: 3/4"NPT

Classification: Generalpurpose

CEcompliance: EN61326EMC/EN61010‐1safety





LongSensor



ShortSensor



4of12  MN890640A

SAFETYPRECAUTIONS StepTwo

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

ThismanualincludesinformationonallmodelsoftheDwyerInstrumentsThermalDispersionFlowSwitch:

TDSSeries.Pleaserefertothepartnumberlocatedontheswitchlabeltoverifytheexactmodelwhich

youhavepurchased.

 User’s Responsibility for safety:  Dwyer Instruments manufactures a wide range of flow switches and

technologies,whileeachofthesesensorsisdesignedtooperateinawidevarietyofapplications;itisthe

user’s responsibility to select a sensor 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 eclectically 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TDSseriessensorsareavailableintwodifferentwettedmaterials. Models

TDS1_2aremadeofPolypropylene(PP)withRyton®tips.Models TDS 2_2 are made of Polyvinylidene

Fluoride(PVDF).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Guide(availablefromCompassPublications).

WiringandElectrical:Thesupplyvoltageusedtopowerthesensorshouldneverexceedamaximumof36

voltsDC.Electricalwiringofthesensorshouldbeperformedin accordancewith all applicable national,

state,andlocalcodes.

Flammable, Explosive and Hazardous Applications:  DO NOT USE THE TDS SERIES GENERAL PURPOSE

FLOWSWITCHESINHAZAROUSLOCATIONS.

Warning 

Theratingfortherelayis120VAC/60VDC@1A.ForCEratedapplications,therelayratingis60

VAC/60VDC@1Amp.

Dwyer Instrument’s Thermal Dispersion flow switches are not recommendable for use with

electricallychargedapplicationliquids.Formostreliableoperation,theliquidbeingmeasuredmay

needtobeelectricallygrounded.

Thesensingtipofthesensormustalwaysbesubmersedintheliquidandneverexposedtoair.

Theliquidtemperaturemustremainconstantandnotchangethroughouttheprocess.





MN890640A  5of12

INTRODUCTION StepThree

Configurations:

Part

Number

Length

Material

(body)

Material

(cable)

TDS112 Short(3”) PP‐Ryton® Polypropylene

TDS122 Long(4.5”) PP‐Ryton® Polypropylene

TDS212 Short(3”) PVDF FEP

TDS222 Long(4.5”) PVDF FEP

Technology:Thethermaldispersionflowswitchesmeasureliquidtemperaturetodeterminechangesinflow

velocity.Asfluidflowsacrossthesensingtips,thetemperatureisreducedproportionatelyasafunctionofthe

flowrate.Whenatemperatureorvelocityshiftreachestheuserdefinedsetpoint,theswitchchangesstate

indicatingtheappropriateflowcondition(flowofno‐flow).

Dwyer Instrument’s sophisticated electronics convert the temperature shift into a signal which indicates

whetherafloworno‐flowconditionoccurs.Dependingonhowthesensoriswired,thissignalmaybewired

fornormallyopenornormallyclosedcircuits.

Dwyer Instrument’s Thermal Dispersion flow switches have no moving parts to clog or foul, making them

suitable for a verity of applications, including non‐coating and non‐scaling liquids.  The TDS series directly

measuremassflowandcanoperateoverboardrangeofliquidsfrom0.4to1.2specificgravityand1to200

cp.

InitializingSequenceforTDSseries:PoweringuptheTDSseriesisdifferentinliquidandair.Whentheflow

switchispoweredupwhilesubmersed,theTDSserieswillimmediatelyindicateflowbeforeswitchingtoits

correctstate.Whentheflowswitchispoweredupinair,theTDS series will immediately indicate no‐flow

beforeindicatingitscorrectstate.Atimedelaymaybeusedtoeliminatetheinitializationsequence.Dwyer

Instrument’sthermaldispersionrelaycontrollersfeaturea0to60secondtimedelayforyourconvenience.

SetPoints:TheTDSseriesflowswitchsetpointisfactorycalibratedto0.2fps.Toconvertfeet/sectoGPM,

pleaserefertothechartbelow.

FlowRatevs.Velocity

(gpmvs.fps)





6of12 MN890640A

Installation StepFour

TheTDSseriesflowswitchmustalwaysbeincontactwiththe

liquidbeingmeasured.Theflowswitchesfeaturea3/4”NPT

threads which will allow it to be used with various types of

fittings. Be sure to check the insertion depth of the flow

switchinthefittingafteritisinstalled.Seethediagramtothe

rightfortherecommendedinsertiondepth.

 Thetwotipofthesensoraretobeperpendicularto

theflow(asseentotheright).Nevermountthetips

withoneinfromtoftheother.

Whenusinganytypeoffitting,theorientationaswellasthe

insertion depth of the flow switch in the pipe is critical. See

the diagram to the right for the recommended orientation.

Bestlocationforinstallationwillbealongthetopofthepipe.

Warning 

Theflowswitchtipshaveathinplasticwallwhichmaybedamagedifdroppedorinstalledimproperly.

TheTDSseriesflowswitchisdesignedforuseinliquid.Forbest results, avoid installing the TDS series

wherebubblesarepresentorwherethetipsoftheswitchmaybeoutoftheliquid.

Thetwo temperatureprobes (tips) must always be perpendiculartotheflow(seetheflowatthesame

time).

MN890640A  7of12

WIRING StepFive



SupplyVoltage:ThesupplyvoltagetotheTDSseriesflowswitchshouldneverexceedamaximumoutputof

36VDC.Usecontrollersorpowersupplied,withaminimumoutputof14VDCormaximumoutputof36VDC.

RequiredCableLength:DeterminethelengthofthecablerequiredbetweentheTDSseriesflow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ft,usingawell‐insulated,14to20

gaugeshield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Output(RelaySwitching):

Allows the sensor to switch a small load on or off

directly, using an internal 1A relay [120 VDC/VDC or

(CE: 60 VDC/VDC)]. 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:



WiringtoaDwyerInstrumentsController:

TDCSeriesController



TSPSeriesController





8of12  MN890640A

WIRING StepSix



WiringtheRelayOutput:TheTDSseriesrelayoutputcanbewiredasadrycontacttoaVDCorVACpower

source. The TDS series does require 14‐36 VDC power to operate the sensor and switch the relay. All

installationsbelowidentifyadryswitchstateasthenormalpositionoftherelay.

SwitchingaNormallyOpenDCLoad(OpenduringFlow,ClosedduringNo‐Flow):

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totheright).



SwitchingaNormallyClosedDCLoad(ClosedduringFlow,OpenduringNo‐Flow):

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totheright).



SwitchingaNormallyOpenACLoad(OpenduringFlow,ClosedduringNo‐Flow):

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 to the right).  Low

voltageVACislessthan36VAC.



SwitchingaNormallyClosedACLoad(ClosedduringFlow,OpenduringNo‐Flow):

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tothe

right).LowvoltageVACislessthan36VAC.



ForallSensorWiringdiagramsabove:

SensorPower:RedandBlackWires(36VDCMax.)

RelayRating: GreenandWhiteWires(60VA,1AMax.)





MN890640A  9of12

WIRING StepSeven

WiringasaP‐ChannelorN‐Channeloutput:TheTDSseriescanbesubstitutedforeitheraP‐Channel(PNP,

Sourcing)outputorN‐Channel(NPN,sinking)output.

NormallyOpenDCLoadasaP‐ChannelOutput(OpenduringFlow,ClosedduringNo‐Flow):

To wire as a NO P‐Channel output follow the

directions below. The Red Wire connects to Positive

(+)ofthe power supply and the Blackwireconnects

toNegative(‐).TheGreenwireisjumpingtotheRed

wirewhiletheWhitewireisconnectedtotheLOAD.

JumpertheLOADbacktotheNegative(‐)tocomplete

thecircuit.



NormallyClosedDCLoadasaP‐ChannelOutput(ClosedduringFlow,OpenduringNo‐Flow):

To wire as a NC P‐Channel output, follow the

directionsbelow.TheBlackwireconnectstoPositive

(+)ofthepowersupplyandtheRedwireconnectsto

Negative (‐). The Green wire is jumping to the Black

wirewhiletheWhitewireisconnectedtotheLOAD.

JumpertheLOADbacktotheNegative(‐)tocomplete

thecircuit.



NormallyOpenDCLoadasaN‐ChannelOutput(OpenduringFlow,ClosedduringNo‐Flow):

To wire as a NO N‐Channel output, follow the

directions below. The Red wire connects to Positive

(+)ofthe power supply and the Blackwireconnects

toNegative(‐).ThewhitewireisjumpingtotheBlack

wirewhiletheGreenwireisconnectedtotheLOAD.

JumpertheLOADbacktothePositive(+)tocomplete

thecircuit.



NormallyClosedDCLoadasaN‐ChannelOutput(ClosedduringFlow,OpenduringNo‐Flow):

To wire as a NC N‐Channel output, follow the

directionsbelow.TheBlackwireconnectstoPositive

(+)ofthedirectionsbelow.TheBlackWireconnects

toNegative(‐).ThewhitewireisjumpingtotheRed

wirewhiletheWhitewireisconnectedtotheLOAD.

JumpertheLOADbacktoPositive(+)tocompletethe

circuit.



ForallSensorWiringdiagramsabove:

SensorPower:RedandBlackWires(36VDCMax.)

RelayRating: GreenandWhiteWires(60VA,1AMax.)





10of12  MN890640A

CALIBRATION StepEight

SetPoint:Ifthepresetfactorycalibration isnotadequateforyourapplication,followthecalibrationsteps

listedbelow.

Note: The switch’s internal LED will be on when the switch detects no‐flow and will off when the switch

detects flow, regardless of thepolarity of theRed and Black wires.ReversingtheRedandBlackwireswill

reversethepolarityoftherelayswitch,butnottheinternalLED.

1. Install the fitting and flow switch as described in the Installation section of this manual. Turn the flow

switchandcontrollerpoweronandadjusttheflowratetothe application setting. If the medium to be

sensedislikely tobesubjectto anytemperaturevariation,theflowswitchshouldbesetasthehighest

normaltemperaturelikelytobeencountered.

2. Locatethepotentiometerknobatthetopoftheflowswitch.The red LED is visible through the

potentiometer.Theadjustmentisasingleturn270°potentiometer.Theinitialresponsetimeoftheflow

switchafteradjustmentis1to10seconds.Adjustthepotentiometerinslowincrementsandwaitforthe

response.

a. LEDisON‐IftheLEDison,slowlyadjustthepotentiometercounter‐clockwise,withasmallflathead

screwdriveruntiltheLEDturnoff.

b. LEDisOFF‐IftheLEDisoff,slowlyadjustthepotentiometerclockwise.withasmallflathead

screwdriveruntilthelightturnson.

3. AdjustthepotentiometerbackandforthwheretheLEDisswitching,eventuallysettlingforwheretheLED

isOFF(thisisthelowflowstatefortheswitch).

a. Iftheflowisincreased,theLEDwillremainOFFindicatingaflowcondition

b. Iftheflowisdecrease,theLEDwillturnONindicatingano‐flowcondition.

4. Verifythatthenewcalibrationiscorrectbyloweringthesystemflowratebelowthesetpointandcheckto

seethattheredLEDturnson.ThenincreasetheflowrateabovethesetpointandverifythattheredLED

turnsoffaccordingly.

TDSSERIESFlowSwitch

(LiquidOnly)

Potentiometer

Location



MN890640A  11of12

MAINTENANCE StepNine

MAINTENANCE/REPAIR:TheTDSSeriesisnotfieldserviceableandshouldbereturnedifrepairisneeded(fieldrepair

shouldnotbeattemptedandmayvoidwarranty).

General:  The TDS series flow switch requires no periodic maintenance except to clean off any deposits or

scaling from the sensor tip as necessary. 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:MakesurethattheflowisoffandthepressureisdownpriortoremovingtheTDSseries

flowsswitch.Carefully,removethesensorfromtheinstallation.Replacethesensorwitha3/4”NPTplug

toinsure that the liquid does notleak out during this procedure.Do not re‐install the TDS series if the

threadsaredamaged.

3. Cleaningthesensor:Useasoftbristlebrushandmilddetergent,carefullywashtheTDSseriesflow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surface sensor. Do not use incompatiblesolvents

whichmaydamagethesensor’sPP/RytonorPVDFplasticbody.

4. Sensor Installation: Follow the appropriatesteps of installation asoutlinedin theinstallationsectionof

thismanual.

TestingtheSensor:

1. Immersingtheswitch:Placetheswitchinacupofwater.Makesurethetipsaresubmersedinthewater.

2. Power: TurnonpowertotheswitchwithRedto(+)andBlackto(‐).  Youcanreversethepolarityif

desired.

3. No‐Flow/Flow Test: With the switch setting still in the cup, wait until the Red LED turns ON (no‐flow

condition).

a. SwirltheswitchinthecupandwaituntiltheRedLEDturnOFF(flowcondition).

b. StopswirlingthesensorandletitrestinthecupwaitingfortheRedLEDtoturnONagain(no‐flow

condition).

c. Repeattheabovetwosteps.

4. RelayTest:Connectamultimeter(settoreadOhms)totheWhiteandGreenWires.Performtheabove

No‐Flow/Flowtestwiththemultimeterconnecttoobservetheactuationoftherelay.

a. With Redto(+) andBlackto(‐),themultimeterwillread asmallresistanceduringno‐flow(closed

relay)andOLduringaflowcondition(openrelay).

b. ReversePolarity[Redto(‐)andBlackto(+)]toseethemultimeter readOLduringano‐flowstate

(openrelay)andasmallresistanceduringaflowcondition(closedrelay).

TheNo‐Flow/Flowtestdeterminesiftheswitchiscapableofsensingthechangesbetweenno‐flowandflow.

TheRelaytestdeterminestheabilityoftherelaytoswitchbetweenano‐flowandflowcondition.Thisisthe

basictesttodeterminefunctionalityofthesensor. 

12of12  MN890640A

WARRANTY StepEleven

WARRANTY/RETURN

Referto“TermsandConditionsofSale”inourcatalogoronourwebsite.ContactcustomerservicetoreceiveaReturn

GoodsAuthorizationnumberbeforeshippingyourproductbackforrepair.Besuretoincludeabriefdescriptionofthe

problemplusanyrelevantapplicationnotes.

DwyerInstruments,Inc.

Attn:RepairDepartment

102Highway212

MichiganCity,IN46360



Dwyer Series TDS User manual

Dwyer Series TDS User manual

Dwyer Series TDS User manual

Related papers

Other documents