Dwyer Series TDS User manual

Type
User manual
MN
8
8
90640A
Mi
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1of1
2
2
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lowflowalarm.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FailSafe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iscompatiblewiththeapplicationliquid.To
determinethechemicalcompatibilitybetweenthesensoranditsapplication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temperatureto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,theTDS series will immediately indicate no‐flow
beforeindicatingitscorrectstate.Atimedelaymaybeusedto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easyinstallation,removal and/ormaintenanceof
thesensor.Thecablelengthmaybeextendeduptoamaximumof1000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foilshield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aVDC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bereturned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powerto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(noflow
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noflow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beforeshippingyourproductbackforrepair.Besure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
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Dwyer Series TDS User manual

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