Mounting and Operating Instructions

EB 8365 EN

Tran

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Edition October 2013

Type 4746 Electric or Pneumatic Limit Switch

2 EB 8365 EN

Note on these mounting and operating instructions

These mounting and operating instructions assist you in mounting and operating the device safely. The instructions are binding for handling SAMSON devices.

Î For the safe and proper use of these instructions, read them carefully and keep them for later reference.

Î If you have any questions about these instructions, contact SAMSON‘s After-sales Service Department (aftersalesservice@samson.de).

The mounting and operating instructions for the devices are included in the scope of delivery. The latest documentation is available on our website at www.samson.de > Service & Support > Downloads > Documentation.

Definition of signal words

Hazardous situations which, if not avoided, will result in death or serious injury

Hazardous situations which, if not avoided, could result in death or serious injury

Property damage message or malfunction

Additional information

Recommended action

DANGER!

WARNING!

NOTICE!

Note

Tip

Contents

EB 8365 EN 3

1 General safety instructions .............................................................................52 Design and principle of operation ..................................................................62.1 Principle of operation .....................................................................................62.1.1 Type 4746-x2InductiveLimitSwitch ................................................................62.1.2 Type 4746-x3ElectricLimitSwitch ...................................................................62.1.3 Type 4746-04PneumaticLimitSwitch ..............................................................62.2 Article code and versions ...............................................................................82.3 Technicaldata .............................................................................................102.4 Accessories .................................................................................................122.5 Summaryofexplosionprotectionapprovals ...................................................123 Attachment to the valve ...............................................................................143.1 Attachmenttovalvewithcastyoke ................................................................143.2 Attachmenttovalvewithrod-typeyoke ..........................................................143.3 AttachmenttoType 3591Valve .....................................................................163.4 Attachmenttopositioners..............................................................................184 Connections ................................................................................................194.1 Electricalconnection .....................................................................................194.1.1 SwitchingamplifierforType 4746-x2 ............................................................214.2 PneumaticconnectionforType 4746-04 ........................................................215 Operation ...................................................................................................225.1 Adjusting the switching point ........................................................................225.1.1 Type 4746-x2 ..............................................................................................225.1.2 Type 4746-x3andType 4746-04 .................................................................236 Servicing explosion-protected devices ..........................................................247 Maintenance and calibration .......................................................................248 Dimensions .................................................................................................259 Certificates ..................................................................................................26

EB 8365 EN 5

General safety instructions

1 General safety instructionsFor your own safety, follow these instructions concerning the mounting, start-up and opera-tion of the device: − Thedeviceistobemounted,starteduporoperatedonlybytrainedandexperienced

personnel familiar with the product.According to these mounting and operating instructions, trained personnel refers to indi-viduals who are able to judge the work they are assigned to and recognize possible dan-gersduetotheirspecializedtraining,theirknowledgeandexperienceaswellastheirknowledge of the applicable standards.

− Explosion-protectedversionsofthisdevicearetobeoperatedonlybypersonnelwhohasundergonespecialtrainingorinstructionsorwhoisauthorizedtoworkonexplosion-pro-tecteddevicesinhazardousareas.Seesection 6.

− Any hazards that could be caused in the valve by the process medium and the operating pressure or by moving parts are to be prevented by taking appropriate precautions.If inadmissible motions or forces are produced in the pneumatic actuator as a result of the supply pressure level, it must be restricted using a suitable supply pressure reducing station.

To avoid damage to any equipment, the following also applies: − Proper shipping and storage are assumed.

Devices with a CE marking fulfill the requirements of the Directive 2014/34/EU and the Directive 2014/30/EU. The declarations of conformity are included in the Appendix of these instructions.

Note

6 EB 8365 EN

Design and principle of operation

2 Design and principle of oper-ation

The limit switches are attached to pneumatic controlvalvesaswellastoType 4765andType 4763Positioners.These limit switches have either inductive, electric or pneumatic contacts. They issue a signalwhenthevalvetravelexceedsorfallsbelow a limit, especially when a control valve hasreacheditsfinalposition.Thissignalistransmitted, e.g. to an alarm or indicating system.

2.1 Principle of operationThe valve travel is transmitted either directly to the pin (1.1) and lever (1) of the limit switchbytheplate(10)orbyacouplingpinwhen a positioner is attached. The linear travel is converted into a rotary motion by the shaft (2).

2.1.1 Type 4746-x2InductiveLimit Switch

In this version, the shaft (2) carries two switchcases(3)withadjustablemetaltags(4.1)fornon-contactactivationoftheinte-gratedproximityswitches(5).Fortheopera-tionofinductivelimitcontacts(exceptforType 4746-0281),appropriateswitchampli-fiersmustbeintegratedintotheoutputcir-cuit.The switching function and switching point are continuously adjustable using the adjust-mentscrew(3.1).

2.1.2 Type 4746-x3ElectricLimit Switch

In this version, the shaft (2) carries two switchcases(3)withadjustablecamdisks(4.2).Eachcamdiskactivatesanelectricdouble-throwswitch(7)overtheroll(6.1),which is attached to the switch lever (6). The switching function and switching point are continuously adjustable using the adjustment screw(3.1).

2.1.3 Type 4746-04PneumaticLimit Switch

In this version, the shaft (2) carries two switchcases(3)withadjustablecamdisks(4.2).Eachcamdiskactivatesanozzle/flappersysteminthepneumaticswitch(8).Wheneverthecamdisk(4.2)activatestheswitch lever (6) over the roller (6.1), the noz-zle in the pneumatic switch (8) is opened and the supply air is switched from the mi-croswitch(9)throughtoportA1 or A2.The nozzle is closed in the pneumatic switch (8) and the supply air applied to the micros-witchiscutofffirstwhenthecamdiskhasreleased the switch lever (6). As a result, pressure is no longer applied to port A1 or A2.The switching function and switching point are continuously adjustable using the adjust-mentscrew(3.1).

EB 8365 EN 7

Design and principle of operation

3.13

5

L

10

4.1 1 1.12

L

3.13

1076.26.16

4.2 1 1.12

L

3.13

4.2 1 1.12

1086.26.16

A1 A29 9

8.2 8.1 8.1 8.2

pz

Inductive limit switch

Electriclimitswitch

Pneumatic limit switch with switching function

1 Leverforvalvetravel1.1 Coupling pin2 Shaft3 Switch case3.1 Adjustment screw4.1 Metal tag4.2 Cam disk5 Proximityswitch6 Switch lever6.1 Roller6.2 Spring7 Electricswitch8 Pneumatic switch8.1 Nozzle (in switch)8.2 Flapper9 Pneumatic microswitch10 Plate attached either to actuator

stem or plug stem

Fig. 1: Functional drawings

8 EB 8365 EN

Design and principle of operation

1) Type 4746-3200onlywithFMcertification

2.2 Article code and versionsLimit switch (deviceindex.07orhigher) Type 4746- x x x x x x x 0 x x x xExplosionprotectionWithout 0ExII2GExiaIICT6accordingtoATEX 1CSA/FMintrinsicallysafe/nonincendive 3ExII3GExnAIIT6accordingtoATEX 8TypeInductive 2 1/2Electric 3 2Pneumatic 0 4 2ContactsProximityswitchSC3,5-N0-YE 1) 2 0 0 1 0ProximityswitchSJ3,5-SN 2 1 0 1 0ProximityswitchSJ3,5-S1N 2 1 1 1 0SAIA,electricmicroswitchXGK3 3 2 0 2 1 0SAIA,electricmicroswitchXGK3-81 3 2 1 2 1 0Pneumatic microswitch 0 4 4 0 2 0ProximityswitchSB3,5-E2 0 2 8 1 2 1 0Switching elementsWith one switching element 1With two switching elements 2ElectricalconnectionWithout 0 4 4 0 0PlasticcableglandM20x1.5,black 1 0Pneumatic connectionsWithout 0ISO 221/1-G 1/8 0 4 4 0 0 11/8 -27 NPT 0 4 4 0 0 2Special versionsWithout 0 0 0NEPSIapprovalExia,Type 4746-12inductive 1 2 2 0 0 9NEPSIapprovalExnL,Type 4746-82inductive 8 2 2 0 1 0GOSTapproval,Exia,Type 4746-1... 1 2/3 0 1 3KOSHAapproval,Exia 1 2/3 0 1 5

EB 8365 EN 9

Design and principle of operation

Limit switch (deviceindex.07orhigher) Type 4746- x x x x x x x 0 x x x xCompatibility with paintWithout 0Free of substances that impair paint adhesion 1

Limitswitch(deviceindex.06orlower) Type 4746- x x x x

Type

Inductive,withoutexplosionprotection 1

Inductive,ExibIICT6 2

Electric 3

Pneumatic 4

Electricalconnection/lever

Without 0

Cablegland,leverI(deviceindex.04orhigherwithoutlever) 1

Cable gland, lever II for positioner attachment 2

½” USA cable gland, lever I 3

½” USA cable gland, lever II for positioner attachment 4

Contacts

SJ3,5-N 0

SJ3.5-SN 1

SAIA-electricmicroswitchXGK3 2

PneumaticmicroswitchwithISO 228/1-G 1/8 connecting thread 3

Pneumatic microswitch with 1/8-27 NPTconnectingthread 4

SJ3,5-N(whitedotofpaint),max.hysteresiswith100 mmlever=0.6 mm 5

Microswitch (gold contacts) 6

SJ3,5-E2withLED(three-wireswitch)withoutexplosionprotection,NOcontact 1 8

SB3,5-E2(three-wireswitch)withoutexplosionprotection,NOcontact 1 9

Switching elements

With one switching element 1

With two switching elements 2

When replacing devices with index .00 to .03, a mounting kit with lever must also be or-dered (see section 2.4).

Note

10 EB 8365 EN

Design and principle of operation

2.3 Technical dataInductiveLimitSwitch Type 4746-x2 Type 4746-0281

Control circuit Switchingamplifieraccordingto EN60947-5-6

Three-wire switch, operating voltage10to30 V

Proximityswitch SC3,5-N0-YE 2) SJ3.5-SN SJ3,5-S1N SB3,5-E2

Permissible ambient temperature 1)–20to+70 °C –20to

+100 °C–20to+100 °C

–20to+70 °C

With metal cable gland –40to+70 °C –50to+100 °C

–40to+100 °C

–25to+70 °C

Switching function NC contact NC contact NO contact NO contact

Electricalconnections OneM20x1.5cableglandfor5.5to13 mmclampingrange, screwterminalsfor0.2to2.5 mm²wirecross-sections

Degree of protection IP 65

Weight Approx.0.7 kg

Type 4746-x3ElectricLimitSwitch·Specificationsapplytosilverandgold-platedcontacts

Switching element Electriclimitswitch:changeovercontact/SPDT(single-pole/double-throwtype)

Permissible load ACvoltage:220 V,6.9 A, DCvoltage:220 V,0.25 A×20 V,6.9 A

Permissible ambient temperature 1) –20to+85 °C

With metal cable gland –40to+85 °C

Electricalconnections OneM20x1.5cableglandfor5.5to13 mmclampingrange, screwterminalsfor0.2to2.5 mm²wirecross-sections

Degree of protection IP 65

Weight Approx.0.7 kg

Type 4746-04PneumaticLimitSwitch

Switching element Pneumatic limit switch with downstream pneumatic microswitch

Supply air Supplyair1.4 bar(20 psi),canbebrieflyoverloadedupto4 bar(60 psi)

Air consumption 0.04mn³/h

Output 0or1.4 bar(20 psi)

Air capacity Oneswitchclosed:0.7 mn³/h·Twoswitchesclosed:1.0 mn³/h

Permissible ambient temperature –20to+60 °C

Degree of protection IP 54

Weight Approx.0.75 kg

EB 8365 EN 11

Design and principle of operation

Materials

Housingandcover Powder-coated aluminum

Leverandshaft 1.4571

Cable gland M20x1.5,blackpolyamide

Attachment Travel range

AccordingtoIEC 60534-6 LeverI:7.5to60 mm·LeverII:60to180 mm

AttachmenttoType 4763/4765Positioner Travel same as positioner

Compliance ·

1) ObservethelimitsspecifiedintheEC-typeexaminationcertificate.2) Modelsmanufactureduntil2006withSJ3,5Nproximityswitch.

Type 4746-1withtypeofprotectionExia(ATEX)Maximumvaluesforconnectiontocertifiedintrinsicallysafecircuits

Limit Switch Type 4746-12 Type 4746-13

Limitswitches Inductive Electric

Ui 16 V 16 V 45 V

Ii 52 mA 25 mA –

Pi 169 mW 64 mW 2 W

Ci (effective inner capacitance) 60 nF 50 nFNegligibly small

Li (effective internal inductance) 160 µH 250 µH

Temperature classes AmbienttemperaturerangeaccordingtoEC-typeexaminationcertificate(tech-nicaldataspecifiedinabovetableadditionallyapply)

T4 –45to+89 °C –45to+100 °C –45to+80 °C

T5 –45to+60 °C –45to+81 °C –45to+70 °C

T6 –45to+45 °C –45to+66 °C –45to+60 °C

12 EB 8365 EN

Design and principle of operation

2.4 AccessoriesAccessoriesforattachmentaccordingtoIEC 60534-6

Valve Castyoke(NAMURrib), (seesection 3.1)

Rod-typeyoke(18to32 mmroddiameter) (seesection 3.2)

Travel Upto60 mm Upto180 mm Upto60 mm Upto180 mm

Mounting kit order no.

1400-6713(lever I)

1400-6714(lever II)

1400-6713(leverI)plus1400-5342

1400-6714(leverII)plus1400-5342

AccessoriesforattachmenttoType 4763andType 4765Positioner(seesection3.4)

Mounting kit order no. 1400-6710

AccessoriesforattachmenttoType 3351Valve

Valvesize DN 15to50 DN 65to100

Mounting kit order no. 1400-6585 1400-6586

AccessoriesforattachmenttoType 3591ValvewithleverII(seesection 3.3)

Mounting kit order no. 1402-0662

Vent plug

Technical data G ¼connection,–50to+80 °C,material1.4404,degreeofprotectionIP 65

Order no. 1991-2110

2.5 Summary of explosion protection approvalsType Certification Type of protection

4746 STCC Number No.977 0ExiaIICT6X2ExsIIT6XValiduntil 2017-10-01

4746-1

Number RU C.DE.08.00744

1ExiaIICT6/T5/T4GbXDate 2015-01-27

Validuntil 2020-01-26

KCSNumber 3-KB4BO-0038

ExiaIICT6/T5/T4Date 2013-01-31

Validuntil 2016-01-31

4746-12 NEPSINumber GYJ15.1221

ExiaIICT4~T6GbDate 2015-06-16

Validuntil 2020-06-15

EB 8365 EN 13

Design and principle of operation

Type Certification Type of protection

4746-1x

Number PTB98ATEX2114

II2GExiaIICT6GbDate 2003-03-07ECtypeexamina-tioncertificate

4746-3 CSANumber 1607226 Ex iaIICT6:ClassI,Zone0;

ClassI,II,Div.1,GroupsA,B,C,D,E,F,G;ClassI,II,Div.2,GroupsA,B,C,D,E,F,G;

Date 2005-09-16

4746-324746-33 FM

Number 3020228 ClassI,Zone0AExiaIICClassI,II,III,Div.1,GroupsA,B,C,D,E,F,GClassI,Div.2,GroupsA,B,C,D;ClassII,Div.2GroupsF,G;ClassIII;

Date 2005-02-28

4746-8

Number RU C.DE.08.00744 2ExnAIICT6/T5/T4GcX

2Ex icIICT6/T5/T4GcXDate 2015-01-27

Validuntil 2020-01-26

4746-82

NEPSINumber GYJ15.1222X

ExicIICT4~T6GcExnAIICT4~T6GcDate 2015-06-16

Validuntil 2020-06-15

Number PTB02ATEX2012X

II3GExnAIIT6Date 2002-04-05Statement of conformity

4746-83

Number PTB02ATEX2012X

II3GExnAIIT6Date 2002-04-05Statement of conformity

14 EB 8365 EN

Attachment to the valve

3 Attachment to the valveTheaccessorieslistedinsection2.4arere-quired for attachment.

Î The lever (I or II) must be installed before the limit switch is attached to the control valve.To do so, slide the lever clamping plate (1.1) over the lever (1) and slip them on-to the shaft (2) together. Tighten the fas-tening screw (1.2).

3.1 Attachment to valve with cast yoke

1. Attachtheplate(10)tothevalve'sstemconnectorusingtwoscrews(10.1).

2. Attachthepin(11)totheplate(10)us-ing two nuts (11.1).

3. Unscrew the cover of the limit switch. At-tach the limit switch to the valve yoke us-ing the mounting screw (12), washer (13)andO-ring(14).Make sure that the pin (11) is inserted throughthewirestrap(1.3)ofthelever(1).

3.2 Attachment to valve with rod-type yoke

1. Attachtheplate(10)tothevalve'sstemconnectorusingtwoscrews(10.1).

2. Attachthepin(11)totheplate(10)us-ing two nuts (11.1).

3. Fasten the support (15) and the rod clamping plate (16) loosely to the rod.

In the valve travel mid-position, move the supportuntilthecenteroftheplate(10)and the support (15) are aligned.

4. Fasten the rod clamping plate.5. Attach the limit switch to the support us-

ing the mounting screw (12), washer (13)andO-ring(14).Makesurethatthepin (11) is inserted through the wire strap(1.3)ofthelever(1).

Î After attaching the limit switch, make sure that the vent plug of the housing cover faces downward when the valve is installed.

EB 8365 EN 15

Attachment to the valve

1 Lever1.1 Clamping plate1.2 Screw1.3 Wire strap2 Shaft10 Plate10.1 Screws11 Pin11.1 Nuts12 Screw13 Washer14 O-ring15 Support16 Clamping plate

12 13 14

1.12 1.2 1 1.3 11 11.1 1010.1

12 13 15 16

1.12 1.2 1 1.3 11 11.1 1010.1

14

Attachment to valve with cast yoke (NAMUR rib)

Attachment to valve with rod-type yoke

Fig. 2: Attachment to the valve

16 EB 8365 EN

Attachment to the valve

3.3 AttachmenttoType 3591Valve

Î Use the supplied washers for all screw connections.

1. Fasten the round bracket (1) using the clamp(3)andnuts(2)lightlyontothevalve yoke.

2. Screwtightthebar(4)usingthescrews(5)ontotheclamps(3).

3. Fasten the limit switch (6) onto the bar (4)asdescribedinstep3ofsection3.1.Usethethread(7)inthebar.

4. Fastenthemountingbracket(9)usingthescrews(10)totheanti-rotationfixture(8)of the valve.

5. Screw the follower clamp (11) to the mountingbracket(9)usingthenutandbolt (12).

6. Insertthepin(13)intotheoblongholeofthe follower clamp (11). Make sure that the pin is inserted through the wire strap of the follower clamp.

7. Screwthenut(14)ontothepin(13).Place the clamp (16) over the lever (15) of the limit switch (6).

8. Usethenut(17)tofastentheleverontotheleverextension(18).

9. Fastentheotherendoftheleverexten-sion (18) to the follower clamp (11).

10.Perform alignment.

Additional points that apply concerning mounting:

Î Perform the alignment in such a way that the lever (15) is parallel to the oblong hole of the follower clamp (11) at half of the valve travel.

Î After attaching the limit switch, make sure that the vent plug of the housing cover faces downward when the valve is installed.

EB 8365 EN 17

Attachment to the valve

1 Round clamp2 Nut3 Clamp4 Bar5 Screws6 Limitswitch7 Thread8 Anti-rotationfixture9 Mounting bracket10 Screws11 Follower clamp12 Nut and bolt13 Pin14 Nut15 LeverII16 Clamp (for lever)17 Nut18 Leverextension

7

1614138

9

10

11

17

12

815

11

18

10

9

453

1

2

6

Fig. 3: Attachment to Type 3591 Valve

18 EB 8365 EN

Attachment to the valve

3.4 Attachment to positionersFor attachment of the limit switch to the Type 4763orType 4765Positioneraccord-ingtoFig. 4,ashortlever(1)andaninter-mediatepiece(31)arerequiredasaccesso-ries(orderno.1400-6710).1. InsertoneO-ring(30)intoboththeleft

and the right side of the intermediate piece(31).

2. Slidethetwofillisterheadscrews(33)through the limit switch and intermediate piece and insert them into the positioner.

3. Insertthenuts(32)intothepositionerhousing and screw tight the two cap screws(33).

Make sure that the short lever (1) slides over the pin (16) of the positioner.

4. Replacetheventplug(17)intheposi-tioner housing with the screw plug in-cluded in the accessories (order no. 1400-6710).Inexchange,inserttheventplugintothehousing of the limit switch. This ensures that the degree of protection of the limit switch corresponds to that of the posi-tioner.

Î ToachievedegreeofprotectionIP 65,acheckvalve(orderno.1790-7408)needs to be installed in the housing of the limit switch.

17

A B

3031

161

31

32

33

NOTICEAttach the housing cover to the limit switch ensuringthattheventplug(17)facesdownward after the valve is installed.

Leverwithspring

SectionalviewA–B

Fig. 4: Attachment with intermediate piece, e.g. to Type 4765 or Type 4763 Positioner

EB 8365 EN 19

Connections

4 Connections

4.1 Electrical connection

For electrical installation, observe the rele-vant electrotechnical regulations and the ac-cident prevention regulations that apply in the country of use. In Germany, these are the VDE regulations and the accident pre-vention regulations of the employers’ liability insurance.The following regulations apply to installa-tion in hazardous areas: EN 60079-14: 2008, VDE 0165–1 Explosive Atmo-spheres – Electrical Installations Design, Se-lection and Erection.

Adhere to the terminal assignment. Switch-ing the assignment of the electrical terminals may cause the explosion protection to be-come ineffective. Do not loosen enameled screws in or on the housing. The maximum permissible values specified in the EC type examination certificates apply when inter-connecting intrinsically safe electrical equip-ment (Ui or U0, li or I0, Pi or P0, Ci or C0 and Li or L0).

Note on the selection of cables and wires:Observe clause 12 of EN 60079-14: 2008 (VDE 0165, Part 1) for installation of the in-trinsically safe circuits. Clause 12.2.2.7 ap-plies when running multi-core cables and wires with more than one intrinsically safe circuit.The radial thickness of the insulation of a conductor for common insulating materials (e.g. polyethylene) must not be smaller than 0.2 mm. The diameter of an individual wire in a fine-stranded conductor must not be smaller than 0.1 mm. Protect the conductor ends against splicing, e.g. by using wire-end ferrules.When two separate cables are used for con-nection, an additional cable gland can be installed. Seal cable entries left unused with plugs. Fit equipment used in ambient tem-peratures below –20 °C with metal cable en-tries

DANGER!

NOTICE!

Note

20 EB 8365 EN

Connections

Note concerning equipment for use in zone 2:In equipment operated according to type of protection Ex nA II (non-sparking equipment) according to EN 60079-15:2003, circuits may be connected, interrupted or switched while energized only during installation, maintenance or repair.Equipment connected to energy-limited circuits with type of protection Ex nL (energy-limited equipment) according to EN 60079-15:2003 may be switched under normal operating conditions. The maximum permissible values specified in the statement of conformity or its addenda apply when interconnecting the equipment with energy-limited circuits in type of protection Ex nL IIC.

Note

EB 8365 EN 21

Connections

Cable entryThe cables for the electric control signal must be routed through the cable gland on the housing and connected to the input terminals marked+and–asillustratedinFig. 5orac-cording to the adhesive label on the inside of the cover.Thefollowingaccessoriesareavailable:CableglandM20x1.5:Blackplastic,withwasher

Orderno.8808-0180Blueplastic,withwasher

Orderno.8808-0181Nickel-plated brass Orderno.1890-4875AdapterM20x1.5to½NPT:Powder-coated aluminum

Orderno.0310-2149

Deviceindex.06andlowerBlackplastic Orderno.8808-0178Blueplastic Orderno.8808-0179

4.1.1 SwitchingamplifierforType 4746-x2

For operation of the inductive limit switches, switchingamplifiersinaccordancewithEN 60947-5-6havetobeconnectedintheoutputcircuit(notforType 4746-0281).Observe the relevant regulations for installa-tion in hazardous areas.

4.2 Pneumatic connection for Type 4746-04

The air connections are tapped holes with G 1/8ISO 228or1/8-27 NPTthread.Customaryfittingsformetaltubingorplastichoses can be used.

41 42 51 52 42 41 43 52 51 53

GW1 GW2

+ _ _+GW1 GW2

41 42L+ L- 51 52

+ _ _+

GW1 GW2

Type 4746-x2 Type 4746-x3Type 4746-0281

Switchingamplifieracc.toEN60947-5-6 Three-wire version

Voltagesupply10to30 V

Fig. 5: Electrical connection

22 EB 8365 EN

Operation

5 Operation

5.1 Adjusting the switching point

The limit switches attached to control valves are usually adjusted in such a way that a signalisissuedwhenthefinaltravelposi-tions are reached. Optionally, the switching point can also be adjusted to any position within the travel range, e.g. if an intermedi-ate position is to be indicated.

3.1 Adjustment screw4.1 Metal tag4.2 Cam disk

3.14.1, 4.2

42(52)

42(52)

41(51)43(53)

41(51)43(53)

A A

Type 4746-04PneumaticLimitSwitch

Type 4746-x3ElectricLimitSwitch

Type 4746-0281Close three-wire sensor PNP

Type 4746-x2InductiveLimitSwitch

Open

Supply air applied

Open

Closed

Supply air cut off

Closed

Fig. 6: Limit switches

The adjusted switch positions can be record-ed on the supplied adhesive labels marked A,BandCandassignedtothecorrespond-ing switching elements.

5.1.1 Type 4746-x2 Î Move the valve to the switching position andturntheadjustmentscrew(3.1)untilthemetaltag(4.1)reachestheswitchingpoint.

Î Alwaysmovethevalvetothefinaltravelpositions from an intermediate position on adjusting or checking the switching point.

EB 8365 EN 23

Operation

The switching elements and the levers re-quired to activate them react to temperature fluctuations. To ensure reliable switching, the switching hysteresis between the mechanical stop (e.g. plug in the seat) and the switching point of the limit switch must be larger than the displacement of the switching point caused by the temperature change.

Distance between switching points for 100 mmlever:ContactSC3,5-N0-YE≥2 mm,ContactSJ3,5-SN≥0.75 mm.With other lever lengths, adjust the switching point to the changed lever length.Forexample,iftheleverlengthchangesfrom100 mmto160 mm,thedistancebetweentheswitchingpointsisincreasedfrom2.0to3.2 mmcorrespondingly.

Simplifiedadjustmentoftheinductivelimitswitches:ValveCLOSED:Close the valve until the plug sits in the seat.ValveOPEN:Move the valve to the desired travel position, e.g.finalposition. − Turntheadjustmentscrew(3.1)toslowlymovethemetaltag(4.1)towardsthecontact until the switching point is reached.

Note − Turn the adjustment screw in the opposite

direction to achieve that the switching point reaches the stop: contactSC3,5-N0-YE≥1/6 turn and contactSJ3,5-SN≥1/16 to 1/10 turn.

5.1.2 Type 4746-x3andType 4746-04

Î Foradjustment,thecamdisk(4.2)hastobe positioned in such a way that its cam movestowardstheroller(6.1,Fig. 1)inaccordance with the direction of travel.

1. Move the valve to the desired switching position(e.g.finaltravelposition"valveOPEN"or"valveCLOSED").

2. Adjust the switch which is assigned to the upper or lower switching point.

3. Turntheadjustmentscrew(3.1)untilthecamofthecamdisk(4.2)reachestheroller(6.1,Fig. 1)andtheswitchchang-es over.

4. To accurately check the switching point, move the valve slightly back and then move it to the switching position again.

24 EB 8365 EN

Servicing explosion-protected devices

6 Servicing explosion-protected devices

Ifapartofthedeviceonwhichtheexplosionprotection is based needs to be serviced, the device must not be put back into operation untilaqualifiedinspectorhasassesseditac-cordingtoexplosionprotectionrequire-ments,hasissuedaninspectioncertificateorgiven the device a mark of conformity.Inspectionbyaqualifiedinspectorisnotrequired if the manufacturer performs a routine test on the device before putting it back into operation. Document the passing of the routine test by attaching a mark of conformity to the device.Replaceexplosion-protectedcomponentson-ly with original, routine-tested components by the manufacturer.Devices that have already been used outside hazardous areas and are intended for future use inside hazardous areas must comply with the safety requirements placed on ser-viceddevices.Beforebeingoperatedinsidehazardous areas, test the devices according tothespecificationsforservicingexplo-sion-protected devices.

7 Maintenance and calibrationInterconnection with intrinsically safe circuits to check or calibrate the equipment inside or outside hazardous areas is to be performed onlywithintrinsicallysafecurrent/voltagecalibrators and measuring instruments to rule out any damage to components relevant toexplosionprotection.

Î Observethemaximumpermissibleval-uesspecifiedinthecertificatesforintrin-sically safe circuits.

EB 8365 EN 25

Dimensions

8 Dimensions

8320.6

74 189

15

9464

44.5

M20 x 1.5

27.5

9444

.5

1837

1883

7492

15

27.5

7771 30

148

7771 30

148

Type 4746-x2andType 4746-x3Air connection for separate air supplyTappedholeG 1/8

Intermediate piece for attachment to positioner

M8 fastening screw M8 fastening screw

Output

Supply air

Pneumatic connections

LI/LII

LI/LII

NAMUR rib NAMUR rib

Type 4746-04Airconnections,tappedholeG 1/8or 1/8 NPT

LeverlengthLI/LIILeverI:149 mmLeverII:202 mm

26 EB 8365 EN

Certificates

9 Certificates

The type designations of the Types 4746-2 and 4746-3 Limit Switches have been changed. The certificates of conformity remain valid. See the following confirmation for details.

Note

EB 8365 EN 27

28 EB 8365 EN

EB 8365 EN 29

30 EB 8365 EN

EB 8365 EN 31

32 EB 8365 EN

EB 8365 EN 33

34 EB 8365 EN

Ad

den

du

m P

ag

e 5

Revi

sion

s C

on

trol N

um

ber:

2 S

epte

mb

er

20

15

A

dd

en

du

m t

o E

B 8

365

EN

Inst

alla

tion

Ma

nu

al

for

ap

pa

ratu

s a

pp

rove

d b

y FM

for

use

in

ha

zard

ous

loca

tion

s.

Elec

tric

al r

atin

g of

intr

insi

cally

saf

e ap

para

tus

and

appa

ratu

s fo

r in

stal

latio

n in

haz

ardo

us

loca

tions

. Ta

ble

1:

Ma

xim

um

va

lues

U

i or

Vm

ax

Ii or

Ima

x P

i or

Pm

ax

Ci

Li

Lim

it s

wit

ches

(i

nd

uct

ive)

Typ

e S

J3,5

…

16 V

25

/52

mA

64

/169

mW

60

nF

250

µH

Lim

it s

wit

ches

(i

nd

uct

ive)

Typ

e S

C3,5

…

16 V

25

mA

34

mW

15

0 nF

15

0 µH

Lim

it s

wit

ches

(e

lect

rica

l)

28 V

11

5 m

A

2 W

0

nF

0 µH

Note

s: U

0 o

r V

0C o

r V

t ≤

Ui or

Vm

ax /

I0 o

r I0

C o

r It

≤ I

i or

Ima

x

P0

or

Pm

ax

≤ P

i or

Pm

ax

Tab

le 2

: FM

- a

pp

rove

d b

arr

ier

pa

ram

ete

rs o

f ele

ctri

cal

lim

it s

wit

ch c

ircu

its

Ba

rrie

r Su

pp

ly b

arr

ier

Eva

lua

tion

ba

rrie

r

V0

C

Rm

in

I0C

Pm

ax

V0

C

Rm

in

I0C

Lim

it s

wit

ches

(e

lect

rica

l)

≤ 28

V

≥ 98

Ω

≤ 11

5 m

A

≤ 2

W

≤ 28

V

# 0

mA

Tab

le 3

: Th

e co

rrel

atio

n be

twee

n te

mpe

ratu

re c

lass

ifica

tion

and

perm

issi

ble

ambi

ent

tem

pera

ture

ran

ges

is s

how

n in

the

tabl

e be

low

:

Tem

pera

ture

cla

ss

Perm

issi

ble

am

bie

nt

tem

pera

ture

ra

ng

e

T6

T5

T4

- 45

°C …

60

°C

- 45

°C …

70

°C

- 45

°C …

80

°C

Ad

den

du

m P

ag

e 6

Revi

sion

s C

on

trol N

um

ber:

2 S

epte

mb

er

20

15

A

dd

en

du

m t

o E

B 8

365

EN

Tab

le 4

: F

or t

he M

odel

474

6 –

32

Lim

it Sw

itch

with

typ

e SJ

3,5

… s

enso

rs t

he c

orre

latio

n

be

twee

n te

mpe

ratu

re c

lass

ifica

tion,

per

mis

sibl

e am

bien

t tem

pera

ture

ran

ges

and

max

imum

sho

rt-

circ

uit c

urre

nt is

sho

wn

in t

he ta

ble

belo

w:

Tem

pera

ture

cla

ss

Perm

issi

ble

am

bie

nt

tem

pera

ture

ra

ng

e

Ma

xim

um

sh

ort

-cir

cuit

cu

rren

t

T6

T5

T4

- 45

°C …

45

°C

- 45

°C …

60

°C

- 45

°C …

75

°C

52m

A

T6

T5

T4

- 45

°C …

60

°C

- 45

°C …

80

°C

- 45

°C …

80

°C

25m

A

Tab

le 4

: F

or t

he M

odel

474

6 –

32

Lim

it Sw

itch

with

typ

e SC

3,5

… s

enso

rs t

he c

orre

latio

n

be

twee

n te

mpe

ratu

re c

lass

ifica

tion,

per

mis

sibl

e am

bien

t tem

pera

ture

ran

ges

and

max

imum

sho

rt-

circ

uit c

urre

nt is

sho

wn

in t

he ta

ble

belo

w:

Tem

pera

ture

cla

ss

Perm

issi

ble

am

bie

nt

tem

pera

ture

ra

ng

e

Ma

xim

um

sh

ort

-cir

cuit

cu

rren

t

T6

T5

T4

- 45

°C …

55

°C

- 45

°C …

67

°C

- 45

°C …

80

°C

25m

A

Intr

insi

cally

safe

if

inst

all

ed

as

speci

fied

in

ma

nu

fact

ure

r’s

inst

alla

tion

ma

nu

al.

FM

- a

pp

rove

d f

or

ha

zard

ous

loca

tion

s

Cla

ss I

, Z

on

e 0

A E

x ia

IIC

T6,

C

lass

I, II

, II

I, D

ivis

ion

1, G

rou

ps

A,

B,

C,

D, E,

F +

G

NEM

A 3

R

Note

s:

1.)

The

appa

ratu

s m

ay b

e in

stal

led

in in

trin

sica

lly s

afe

circ

uits

onl

y w

hen

used

in c

onju

nctio

n w

ith t

he F

M a

ppro

ved

appa

ratu

s.

For

max

imum

val

ues

of U

i or

Vm

ax

; Ii o

r Im

ax;

Pi o

r Pm

ax

; Ci a

nd L

i o

f th

e va

riou

s ap

para

tus

see

Tabl

e 1

. 2

.) Th

e ap

para

tus

may

be

inst

alle

d in

intr

insi

cally

saf

e ci

rcui

ts o

nly

whe

n us

ed in

con

junc

tion

with

the

FM

app

rove

d in

trin

sica

lly s

afe

barr

ier.

Fo

r ba

rrie

r se

lect

ion

see

Tabl

e 2

. 3

.) Th

e in

stal

latio

n sh

all b

e in

acc

orda

nce

with

the

Nat

iona

l Ele

ctri

cal C

ode

AN

SI/N

FPA

70

an

d A

NSI

/ISA

RP

12

.06.

01.

4

.) Sa

fety

Bar

rier

sha

ll be

FM

-App

rove

d. E

ach

pair

of

I.S.

wir

es s

hall

be p

rote

cted

by

a sh

ield

th

at is

gro

unde

d at

the

I.S.

Gro

und.

The

shi

eld

shal

l ext

end

as c

lose

to th

e te

rmin

als

as

poss

ible

. 5

.) U

se o

nly

supp

ly w

ires

sui

tabl

e fo

r 5

°C a

bove

am

bien

t te

mpe

ratu

re.

EB 8365 EN 35

Ad

den

du

m P

ag

e 7

Revi

sion

s C

on

trol N

um

ber:

2 S

epte

mb

er

20

15

A

dd

en

du

m t

o E

B 8

365

EN

Vers

ion

: M

odel

474

6-3

3 E

lect

rica

l Lim

it Sw

itch.

Sup

ply

and

eval

uatio

n ba

rrie

r FM

app

rove

d.

Cab

le e

ntry

M 2

0 x

1.5

or

met

al c

ondu

it ac

cord

ing

to d

raw

ing

N

o. 1

050

– 0

539

T o

r 10

50 –

054

0 T

FM-

ap

pro

ved

for

ha

zard

ous

loca

tion

s

Cla

ss I

, D

ivis

ion

2, G

rou

ps

A,

B, C

, D

NEM

A 3

R

Cla

ss I

I D

ivis

ion

2, G

rou

ps

F +

G, C

lass

III

H

AZ

AR

DO

US

SAFE

LO

CA

TIO

N (

Div

. 2

) LO

CA

TIO

N

sup

ply

ba

rrie

r

eva

lua

tion

ba

rrie

r

Model 4746-3 Limit Switch

41

+

42-

41+

42-

51+

52-

51+

52-

elec

tric

al li

mit

switc

h

Mod

el 4

746-

33

indu

ctiv

e lim

it sw

itch

Mod

el 4

746-

32

indu

ctiv

e lim

it sw

itch

Mod

el 4

746-

32

elec

tric

al li

mit

switc

h

Mod

el 4

746-

33

Term

inal

No.

I.S.

Gro

un

d

rela

y or

tra

nsi

stor

ou

tpu

t

HA

ZA

RD

OU

S

LOC

ATI

ON

SAFE

LOC

ATI

ON

sup

ply

ba

rrie

r

eva

lua

tion

ba

rrie

r

Model 4746-3 Limit Switch

41+

52-

41+

42-

limit

switc

h

circ

uit 1

limit

switc

h

Circ

uit 2

Term

ina

l N

o.

Gro

un

d

UNSPECIFIED APPARATUS

e. g. transistor relay, transmitter

Ad

den

du

m P

ag

e 8

Revi

sion

s C

on

trol N

um

ber:

2 S

epte

mb

er

20

15

A

dd

en

du

m t

o E

B 8

365

EN

Note

s:

1.)

For

the

max

imum

val

ues

for

the

indi

vidu

al c

ircu

its s

ee T

able

1 a

nd 2

. 2

.) C

able

ent

ry M

20

x 1

.5 m

etal

con

duit

acco

rdin

g to

dra

win

g

No.

105

0-0

539

T a

nd 1

050

-054

0 T

3.)

The

inst

alla

tion

shal

l be

in a

ccor

danc

e w

ith t

he N

atio

nal E

lect

rica

l Cod

e A

NSI

/NFP

A 7

0

Inst

alla

tion

dra

win

g C

on

trol

Rela

y H

ab

– c

Ex d

e w

ith

Mod

el SJ

-b-N

Pro

xim

ity

Sen

sors

Con

tro

l R

ela

y Te

rmin

al N

o.

Gro

up

s L

[ m

H ]

C

[ µ

F ]

V0C

[ V

]

ISC

[ m

A ]

1-3

; 2

-3

4-6

; 5

-6

A +

B

84

,8

1,2

7

12

,9

19

,8

C +

E

29

9

3,8

2

D, F,

G

74

4

10

,2

HA

ZA

RD

OU

S

LOC

ATI

ON

SAFE

LOC

ATI

ON

contact

Cla

ss I

,

Div

isio

n 1

, G

rou

ps

A, B

, C

, D

C

lass

II,

D

ivis

ion

1,

Gro

up

s E

, F

an

d G

C

lass

II

I, D

ivis

ion

1

to in

trin

sica

lly

safe

outp

ut

Model 4746-3 Inductive limit switch circuit

+ -

pro

xim

ity

sen

sor

1+

2+

3- 4+

5+

6-

intr

insi

cally

safe

outp

ut

to s

enso

r o

r co

nta

ct

cha

nn

el 3

to o

ne c

om

mon

lin

e p

oss

ible

Sw

itch

-Iso

lato

rs

Typ

e K

Ha

b –

c E

xd

Typ

e K

Ha

b –

c E

xde

12

+

11

+

10

-

9+

8+

7-

supply and output terminals

Mo

del d

esi

gn

ati

on

co

de T

ype K

Ha

b –

cEx

d

Term

inal

s 1-

3, 2

-3, 4

-6, 5

-6

a=

Su

pp

ly V

olt

ag

e t

ype A

or

D

a

=A

C, d

=D

C

b=

Su

pp

ly L

evel

2=

24V

DC

±15%

; 5=

120V

AC

+10%

-15%

;

6=

230V

AC+

10%

-15%

; c=

Ou

tput

typ

e O

T1;

TA2 o

r TA

1;

d=

Nu

mb

er

of

cha

nn

els

1 o

r 2

Mo

del d

esi

gn

ati

on

co

de T

ype K

Ha

b –

cEx

de

a=

Su

pp

ly V

olt

ag

e t

ype A

or

D

a

=A

C, d

=D

C

b=

Su

pp

ly L

evel

2=

24V

DC

±15%

; 5=

120V

AC

+10%

-15%

;

6=

230V

AC+

10%

-15%

; c=

Ou

tput

typ

e R

TA/;

RW

1/;

SS1

/; S

S2/;

RS1

/;

SR

/; S

T-o

r SO

T d

= N

um

ber

of

cha

nn

els

1 o

r 2

e=

Pow

er

rail d

esi

gn

ati

on

, P

, 2S.

P o

r G

S.P

(i

ncl

ud

es

Mo

del K

HD

2-E

B-P

B P

ow

er

Feed

M

od

ule

) o

r B

lan

k

ma

xim

um

ca

pa

cita

nce

of

ea

ch in

du

ctiv

e s

enso

r 60n

F m

axi

mum

in

du

cta

nce

of

ea

ch in

du

ctiv

e s

enso

r 25

0µ

H

The

tota

l ser

ies

indu

ctan

ce a

nd s

hunt

cap

acita

nce

of s

hiel

d w

iring

sha

ll be

rest

ricte

d to

the

follo

win

g m

axim

um v

alue

s

36 EB 8365 EN

EB 8365 EN 37

38 EB 8365 EN

EB 8365 EN 39

SAMSON AG · MESS- UND REGELTECHNIKWeismüllerstraße 3 · 60314 Frankfurt am Main, GermanyPhone: +49 69 4009-0 · Fax: +49 69 4009-1507samson@samson.de · www.samson.de EB 8365 EN 20

18-01-17·English