Braun Differential Hall Effect Based Sensor

Differential-Hall-Effect based Sensors

• Speedrangecovering: fromclosetozeroupto12,000pulses/sec. (responsetimemax.40microseconds)

• Clearancetotherotatingpartupto4mm (dependingontheprofilesize)

• Temperaturerange–40°C…+125°C (–40…+255°F)

• Differentialprinciplehinderstheinfluenceof externalmagneticfieldsandofmachine vibration

• Sealedstainlesssteelenclosure(1.4305) withprotectiongradeIP67andallowing >200barpressuretosensortip.Available forconnectionviatightplug,orwithfirmly attachedcable(standardorTefloninsulated)

• Powerfulsquarewaveoutputsignalequally highovertheentirespeedrange.Level approximatelythatofthesupplyvoltage. Adequateforsignaltransmissionovermore than500m.

• Acceptingfineandcoarseprofiles,asgear wheels,slots,cams,holesinanyferrous material,orrotatingmagnets.

OutstandingCharacteristics:

A5S

Appropriateforanyspeeddetectionofrotatingsteelprofile,unlesstheapplicationhasaspecialrequirementaslistedbelow.

Series A5S05 … A5S09

Series A5S10 … A5S13 SpeedDetectionwithinExplosionHazardousareas.Thesesensorsareintrinsicallysafewhen connectedtoourbarrierunitsD461.NofurtherprecautionsrequiredintheEx-area,withinstallationandcabling.

Series A5S30 … A5S33 Detectionofspeedanddirectionbyonlyonesensor.Speedsignalizedasthefrequencyof apulsetrain,directionasthehighorlowstateofabinaryDCvoltage.

Series A5S14 … A5S17 ForspeedanddirectionsensingasA5S30…A5S33…,butunderintrinsicallysafety requirementsforEx-hazardousareas.

Series A5S40 … A5S43 Providing2phase-shiftedspeedpulsetrains,foraseparatedirectionmonitoringwith failuredetection.

TheVariousSeriesandtheirRangeofApplication

Eachseriesincludesseveraldifferingdimen-sionsandconnectionmodes,butallwiththesamefunctionalcharacteristics.FordetailsandorderingNos.seethefollowingpages.

Installation, profile size, and clearance to targetFlushplacementintoanymaterial,closetoanothersensor.Theallowedclearance(gap)tothetargetdependsonitssize:withthesmallestdetectableprofilesizeofmodule0.8(pitch30)itis<1mm,aprofilesizeofmodule4(pitch6)ormoreallowsamaximumgapofnearly4mm.Pleasepayspecialattentiontotheapplicationnotesonpage7.

Connection ModesAllA5S…sensorsareavailablewithahard-wiredcableattached,orwithasocketaccept-ingplug-inconnectors.Thisistheeasierwaytohandlealongcable.Suchcanbeprovidedinstandard(upto85°C)orhightemp(upto125°C)Teflonquality.Withastraightorangularplug,inmetallicorplasticenclosure,alltighttoIP67.Or,theconnectorsonly.

Fordutyunderliquidshowever,orwithnarrowspaceapplications,thefirmcableisthebetterchoice.Availablewithbothinsulationqualities,andanyrequestedlength.

TheHalleffect(namedforitsdiscoverer)utilizesthefact,thatamag-neticfieldmaygenerateavoltagewithinasemi-conductor.Anddoesthisindependentofitsrateofchange(i.e.speedofmotion)–unliketheinductioneffectofmagneticpick-ups,whichrelyontherateandthereforeareweakatlowspeed.ThesensorsA5S…includetheneces-sarymagnet(M)andthehallelementchip(E).Withtheprofilepassingby,themagneticfieldvaries,therebycreatingthesignalvoltagewithinthechip.Hereitisimportanttokeepinmind,thatthesignaldoesnotfadeatlowspeed.

The Differential Hall Effect Principle Itengagesatwinchiphallelement,andthesignalamplifier(V)usesonlythedifferencebetweenboth.Itisthenamplifiedtoprovidethepowersquarewaveoutput.

Its Advantages:Byitsnature,thisdifferentialprinciplecompensatestargetvibrations.Anditbalancesanexternalmagneticfield.Bothimportantaspectsforareliablesignal.

VME

moving profile

sensor output

FunctionPrinciple

02

Plug-inversionshownwithangledconnector

Versionwithfirmlyattachedcable

Plug-inversionshownwithstraightconnector

DesignVersions

03

Sensor Series

SensorSeriesA5S05…A5S09

Application Standardforspeeddetectionwithasingletraceoutput.

Output signal Squarewavepulseswithsequenceaccordingtothetargetprofile(1:1withastandardgear).Amplitude(withoutload)closetosupplyvolt-age.Itspoweroutputpullsorsinksaloadasheavyas25mA.Thisallowsatransmissiondistanceofmorethan500m(≥1500ft),allowingahighfrequencymax.12kHz.Theoutputhighlevelthenmaydropbymax2Volts,theoutputlowlevelthenmayincreasebymax2voltsoverzero.Outputprotectedagainstshortcircuit.

Power Supply Supplyvoltage+5V…+30VDC.Currentap-prox.15mA+loadcurrent(mayincreasewithlargedistancetransmissionandhighsignalfrequencyupto60mA).Safeagainstpolarityerror.

Dimensions AnumberofdifferentmetricandUNFmount-ingthreads(D)areavailable,withvariedlength(L).Theoppositetableliststhepreferencedimensions.Customizeddimensionshavealongerleadtime,andahigherprice.

Inaddition,weofferaversionwithsmoothshaft(16mmØ),mountingbymeansofasealpacking.

Preference Dimensions

Mounting Thread length Seriesthread D L (mm) No.

M12x1 50,80,120 A5S07

M14x1,5 50,90,154,204 A5S05

M18x1 48,94 A5S08

M22x1 48,94 A5S09

5/8-18UNF2A 38,48,100,165 A5S08…A

5/8-18UNF2A 38,48,100,165 A5S08…B*

5/8-18UNF2A 38,48,100,165 A5S08…C**

*) withhexagonalrearflangeendandfirmly attachedPTFE(Teflon)cable.

**) withhexagonalrearflange,1/2NPTinside thread,andfirmlyattachedPTFE(Teflon)cable.

Specificsheetsareavailablefortheseversions.


ApplicationSpeeddetectionwithina hazardousarea.

Protection ClassApprovedforIntrinsicSafetyaccordingtoATEXasII1GEExiaIICT4/T6withcorrectsupplyprovided.

Output signalSquarewavepulseswithsequenceaccordingtothetargetprofile(1:1withastandardgear).Amplitude(withoutload)closetosupplyvolt-age.Itspowerstagepullsuporsinksaloadasheavyas25mA.Thisallowsatransmis-siondistanceofmorethan500m(≥1500ft),allowingahighfrequencymax.12kHz.Theoutputlevelthendropsbyapproximately2V,only.Outputprotectedagainstshortcircuit.OurrecommendedIsolatingBarrierD461providesasquarewaveoutputof24Vlevelandanadditionalpathallowingsensorsupplymonitoring.

Power SupplyByanapprovedsourceensuringmax. +9.9Vand64mA.Werecommendour IsolatingBarrierD461,whichadditionallyensurestheIntrinsicallysafesignalpath.Seeseperatesheet“IsolatingBarriersD461”.

DimensionsAnumberofdifferentmetricandUNFmount-ingthreads(D)areavailable,withvariedlength(L).Theoppositetableliststhepreferencedimensions.Customizeddimensionshavealongerleadtime,andahigherprice.




M12x1 50,80,120 A5S12

M14x1,5 50,90,154,204 A5S13

M18x1 48,94 A5S10

M22x1 48,94 A5S11

5/8-18UNF2A 38,48,100,165 A5S10…A

5/8-18UNF2A 38,48,100,165 A5S10…C*

*) withhexagonalrearflange,1/2NPTinside thread,andfirmlyattachedPTFE(Teflon)cable.

Specificsheetsareavailablefortheseversions.

04


ApplicationDetectionofspeedandsenseofrotationbyasinglesensor.Immediateresponsetomotionreverse.Fittingourevaluatingunits124.1S2andsystemsE16.Foruseonpumps,turngears,machinetools,testinstallations.

Output signal Speedsignalassquarewavepulseswith sequenceaccordingtothetargetprofile(1:1withastandardgearwheel).SenseofrotationasaDC-binarysignal(high=forward,low=reverse).Amplitude(withoutload)closetosupplyvoltage.Itspowerstagepullsuporsinksaloadasheavyas25mA.Outputsprotectedagainstshortcircuit.

Power SupplySupplyvoltage+5V…+30VDC.Currentapprox.20mA+loadcurrent(mayincreasewithlongerdistancetransmissionandhighsignalfrequencyupto60mA).Sensorsafeagainstpolarityerror.

Principle of direction detecting ThesensorincludestwoDifferential-Hall-Effectelements.Theysequentiallydetecttheprofileedgespassing.Fromthetimesequence,thelogiccalculatestheactualsenseoftheirmotion,convertingitintoahigh/lowstateoftheoutput.Thereby,itimmediatelydetectsareversalafteranyedge,independentoftheshapeoftheprofile.Minimumdivisionsize 6mm.Adelayorhysteresisinresponse,ifrequired,maybeintroducedbytheevaluatingunit. Dimensions AnumberofdifferentmetricandUNFmount-ingthreads(D)areavailable,withvariedlength(L).Thetableliststhepreferencedimensions.Customizeddimensionshavealongerleadtime,andahigherprice.




M12x1 80,120 A5S33

M14x1,5 90,154,204 A5S31

M18x1 94 A5S30

M22x1 94 A5S32

5/8-18UNF2A 38,48,100,165 A5S30…A


Application Detectionofspeedandsenseofrotationbyasinglesensor,withinahazardousarea,atafeedingpump,forinstance.CharacteristicssimilartoseriesA5S30…A5S33,butasanintrinsicallysafedevice.

Ex-Protection ApprovedforIntrinsicSafetyaccordingtoATEXasII1GEExiaIICT4/T6withcorrectsupplyprovided.

Output signal Speedsignalassquarewavepulseswithsequenceaccordingtothetargetprofile(1:1withastandardgearwheel).SenseofrotationasaDC-binarysignal(high=forward,low=reverse).Amplitude(withoutload)closetosupplyvoltage.Itspowerstagepullsuporsinksaloadasheavyas25mA.Theoutputlevelthendropsbyapproximately2Vonly.Outputsprotectedagainstshortcircuit. OurrecommendedIsolatingBarrierD461.21providesoutputsof24vlevelandanadditionalpathallowingsensorsupplymonitoring.

Power Supply Byanapprovedsourceensuringmax. +9.9Vand64mA.WerecommendourIsolat-ingBarrierD461.21,whichadditionallyensuresIntrinsicallysafesignalpaths.Seeseperatesheet“IsolatingBarriersD461”.Dimensions AnumberofdifferentmetricandUNFmount-ingthreads(D)areavailable,withvariedlength(L).Theoppositetableliststhepreferencedimensions.Customizeddimensionshavealongerleadtime,andahigherprice.




M12x1 80,120 A5S14

M14x1,5 90,154,204 A5S16

M18x1 94 A5S15

M22x1 94 A5S17

5/8-18UNF2A 38,48,100,165 A5S15…A

05

Sensor Series


Application Speeddetectionprovidingtwophaseshiftedpulseseries.Forspeedandsenseofrotationmonitoring,atpumpsorotherinstallations,requiringdoubletracepulsesforadirectionsignalwithfailuredetection.Evaluationbyseries224.1S2,forinstance.

Output signal 2phaseshiftedsquarewavepulseserieswithsequencedeterminedbythetargetprofile(1:1withastandardgearwheel).Amplitude(with-outload)closetosupplyvoltage.Theirpowerpullsuporsinksaloadasheavyas25mA.Thisallowsatransmissiondistanceovermorethan500meters(≥1500ft),allowingahighfrequencymax.12kHz.Theoutputhighlevelthenmaydropbymax2volts,theoutputlowlevelthenmayincreasebymax2voltsover

zero.Outputprotectedagainstshortcircuit. Thephaseshiftbetweenbothpulseseriesdependsonthetargetprofile.Withagearwheelofmodule2itisapproximately90°,atanyspeed. Power Supply Supplyvoltage+5V…+30VDC.Current approx.20mA+loadcurrent(mayincreasewithlongerdistancetransmissionandhighsignalfrequencyupto>60mA).Sensorsafeagainstpolarityerror. Dimensions AnumberofdifferentmetricandUNFmount-ingthreads(D)areavailable,withvariedlength(L).Thetableliststhepreferencedimensions.Customizeddimensionshavealongerleadtime,andahigherprice.



M12x1 80,120 A5S43

M14x1,5 90,154,204 A5S41

M18x1 94 A5S42

M22x1 94 A5S43

5/8-18UNF2A 100,165 A5S42…A

ApplicationNotestoseriesA5S…

Requirements to the target

Target materialAnystandardsteelwillbeaccepted,butnotstainlesssteel(asnon-magnetic),andnotanon-ferrousmaterial.Slotsinasteelprofilemaybefilledwithsuchmaterial,however,or asteelboltinsertedinanon-magneticpart.

Singlepermanentmagnetsinsertedintoanon-magneticrotorwillalsotriggerthesensor,andmayevenallowforasomewhatlargergap.

Target profileAstandardgearwheelisfrequentlyused,asitiseasytogetandtoplaceontheshaft.Asplitgearwheelmusthaveitsdivisionatthebottombetweentheteeth.Slotsmilledintoasteelshaftorotherrotorresultinasharpandwelldefinedsignal.Butcareshouldbetakentohavesmoothsurfaceandedges.Thesensorwithitssharpresolutionmightotherwiserespondtoscratchesorotherirregularities.Careshouldalsobegiventoaregularpositionofslots,holes,orboltsattherotor.Hexagonalscrewheadsmayresultinanirregularpulsedivision.Aslotorsuchlikeinthescrewheadmaycausemultiplepulses.

Repeatability of the profile marksAnimportantfactor,specificallywithhigh accuracyandhighreliabilityapplications.An irregularity,thoughcoveredupbytheaverag-ingautomaticsinourevaluatingunitsmaycauseafluctuationinthemeasurement.Andthepulsedivider,compensatinganyirregular-ity,willaffectthefastresponseoftheunit. Thesameaccuracy,asrequestedforthemea-surement,shouldapplytotheprofiledivision. Profile size Itdeterminestheallowablegap(clearance)betweensensortipandtarget.Definedbytheslotorcamwidth(whicheveristheshorter),thistablegivesthumbrules:

Width of slot Profile Allowable or cam height max. gap

>1.3mm >2mm 0.8mm

>3mm >4mm 2mm

>5mm >5mm 3mm

>8mm >6mm 4mm

Alargerprofileisaccepted,butdoesnot increasetheallowablegapanyfurther.Mini-

mumthicknessoftarget=5mm(plusapos-siblelateralshift).Directiondetectionrequiresaminimumsizeslot/camof3mm.Speeddoesnotlimitthesizevalues.

Number of polesThisisofimportancemainlywhenmeasur-ingalowspeed.Bynature,themeasurementcannotreacttoavariationbeforethenextpoleisdetected.Athigherspeedtheperiodautomaticsmain-tainsaprogrammedresponsetime.Seeour literatureaboutmeasurementforfurtherde-tails.Anincreaseinthenumberofpolesdoesnotcontributetohighermeasuringaccuracywithourunits,butitmighthelpintheirfastreaction.

06

Sensor positioningAradialorientationofthesensortothetargetcircumferenceisrecommended.Itspositioninparalleltotherotationalaxis,thoughpossible,mayinvolveproblemscausedbyalateralshiftofthetarget.Allspecificationsrefertotherecommendedradialposition.ThedifferentialprincipleoftheA5S…sensors,whichhelpstohindertheinfluenceofothermagneticfieldsandmachinevibrations,neces-sitatesacorrectpositioninginreferencetotheprofileonthetarget.Markingplanesatthesensorrearendassistwiththis,asexplainedinitsinstructions.Adeviationofupto±20degreeswillbetolerated.

Sensorsdetectingthesenseofrotationreversetheirforward/reversesignalbya180°turnofthesensor.Amarkingatthesensorendindi-catestherequiredpositionforagivensenseofthedirectionsignal.

Theallowablegap(clearance)betweensensortipandprofiledependsontheprofilesize(seetable).

Signal output SensorsofseriesA5S…provideasquarewavepulsetrainastheirspeedsignal.Theincorporatedoutputamplifierisstrongenough,topulluportosinkaloadasheavyas25mA(push-pullcharacteristics).Withanyhigherload,specificallyifshortcircuited(tozeroortosupplylead),theincorporatedlimiterrespondsandcutsoffbeforethesensorcansustaindamage.Thus,everyA5S…sensorhastheabilitytotransmitoveradistanceofmorethan500m(1500ft),uptoitshighfrequencyend.FordetailsseeSignalTransmission.

Ifmoreisrequired,aunitD461.11maybeinstalledafter500mtransmission,orinfrontofanevenheavierload,tofeeditadequately.

Signal Frequency Witharegularlydividedtargetprofile(andacorrespondinglyregularoutputpulsetrain)thesignalfrequencyintermsofHzequalsthetar-getspeed(intermsofRPM)multipliedbythenumberofpolesorteeth,anddividedby60.Thisruledoesnotapply,ifthetargetaswheelorshaftisdividedintoslotsorcamswithun-equallength.Instead,theresponsetimeofthesensorshouldbecomparedtotheperiodoftimebywhichtheslotorcam(whateveristheshorter)passesinfrontofthesensorelement,atmaximumspeed.

Whateverthecase,withamaximumfrequencyof12,000Hzandaresponsetimeofmax.40microseconds,anysensoroftheA5S…serieswillserveeveryapplication. Itslowendof0.05Hzallowstheoperationclosetomachinestop.

Signal TransmissionThecharacteristicsofthetransmissionlineisanimportantfactor.Thedatagivenpreviouslyrefertoa3leadsscreenedcablewithaleadcrosssectionof0.5mm2withR<36Ω /kmandC<150pF/m.Thetransmissioncableswesupplyareinconformitywiththis.

ConnectthesesensorsA5S…tothehigh levelinputofourunits(responselevelof >7/<4V).

Toterminatealongtransmissionline,aloadresistorof10kΩeachisrecommendedbetweenthesignalleadandboth+supplyandzero.

Important:Nevertransmitseveraldifferentsignalsunderonecommonscreen.

Keepthesignalcableclearofinterferingsources,anddonotrunitinparalleltopowersupplycables.

Shielding and groundingAlwaysuseanuninterruptedshieldagainstinterferencesbetweensensorandsignalevalu-ation.Connecttheshieldtoground(PE)atthereceivingend.Withatransmissiondistanceexceeding5magroundingatbothendsmaybehelpful.Note:Thesensorbodyandthesensorzeroareisolatedfromeachother.

ApplicationNotestoseriesA5S(continued)

07

D

length L

60 mm

D

length L

45 mm

< 30 mm

length L

D

55 mm

Dimensions

Plug-inversionshownwithangledconnector

Versionwithfirmlyattachedcable

Plug-inversionshownwithstraightconnector

SeetablesintheseriesNo.sectionsfor availablethreaddiametersDandlengthL

Series No. as listed in tables

Connection modeB=forplug-inconnectorC=firmlyattachedstandardcableT=firmlyattachedPTFE(Teflon-)cable

thread length L(aslisted)

length of cable in meters (ifapplicable)

suffix marking a special version (seelistingunderSeriesNo.)

KeytoOrderingNos.

A5SKe001

BRAUN GMBHISO9001certifiedQuality

Post-OfficeBox1106·D-71301WaiblingenPhone:+49(0)7151/9562-30·Fax:+49(0)7151/9562-50·eMail:[email protected]:www.braun-tacho.de

A5S - m

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Braun Differential Hall Effect Based Sensor