Mounting and Operating Instructions

EB 8365 EN Edition October 2013

Type 4746 Electric or Pneumatic Limit Switch

Definition of signal words

DANGER!Hazardous situations which, if not avoided, will result in death or seri-ous injury

WARNING!Hazardous situations which, if not avoided, could result in death or se-rious injury

NOTICEProperty damage message or mal-function

Note:Additional information

Tip:Recommended action

2 EB 8365 EN

Note on these mounting and operating instructionsThese mounting and operating instructions (EB) assist you in mounting and operating the de-vice 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).

Referenced documentationThe documents for the devices used in combination with the limit switch apply in addition to these mounting and operating instructions.The mounting and operating instructions for all supplied devices are included in the delivery. The latest versions of the documents are available on our website at www.samson.de > Prod-uct documentation.

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-x Inductive Limit Switch ..................................................................62.1.2 Type 4746-x3 Electric Limit Switch ...................................................................62.1.3 Type 4746-04 Pneumatic Limit Switch ..............................................................62.2 Article code and versions ...............................................................................82.3 Technical data .............................................................................................102.4 Accessories .................................................................................................122.5 Summary of explosion protection approvals ...................................................123 Attachment to the valve ...............................................................................143.1 Attachment to valve with cast yoke ................................................................143.2 Attachment to valve with rod-type yoke ..........................................................143.3 AttachmenttoType 3591Valve .....................................................................163.4 Attachment to positioner ...............................................................................184 Connections ................................................................................................194.1 Electrical connection .....................................................................................194.1.1 SwitchingamplifierforType4746-x2 ............................................................214.2 Pneumatic connection for Type 4746-04 ........................................................215 Operation ...................................................................................................225.1 Adjusting the switching point ........................................................................225.1.1 Type 4746-x2 ..............................................................................................225.1.2 Type4746-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: − The device is to be mounted, started up or operated only by trained and experienced

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-gers due to their specialized training, their knowledge and experience as well as their knowledge of the applicable standards.

− Explosion-protected versions of this device are to be operated only by personnel who has undergone special training or instructions or who is authorized to work on explosion-pro-tected devices in hazardous areas. Refer to section 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 means of appropriate measures.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.

Note:Positioners with a CE marking fulfill the requirements of the Directives 94/9/EC and 2004/108/EC. The Declaration of Conformity is available on request.

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 signal when the valve travel exceeds or falls below a limit, especially when a control valvehasreacheditsfinalposition.Thissig-nal is transmitted, e.g. to an alarm or indi-cating system.

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

2.1.1 Type 4746-x Inductive Limit Switch

In this version, the shaft (2) carries two switch cases (3) with adjustable metal tags (4.1) for non-contact activation of the inte-grated proximity switches (5). For the opera-tion of inductive limit switches (except for Type 4746-0281),appropriateswitchampli-fiersmustbeintegratedintotheoutputcir-cuit.The switching function and switching point are continuously adjustable using the adjust-ment screw (3.1).

2.1.2 Type 4746-x3 Electric Limit Switch

In this version, the shaft (2) carries two switch cases (3) with adjustable cam disks (4.2). Each cam disk activates an electric double-throw switch (7) over the roller (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 4746-04 Pneumatic Limit Switch

In this version, the shaft (2) carries two switch cases (3) with adjustable cam disks (4.2). Each cam disk activates a nozzle/flappersysteminthepneumaticswitch(8).Whenever the cam disk (4.2) activates the switch lever (6) over the roller (6.1), the noz-zle in the pneumatic switch (8) is opened andthesupplyairfromthemicroswitch(9)is switched through to port A1 or A2.The nozzle is closed in the pneumatic switch (8) and the supply air applied to the micro-switchiscutofffirstwhenthecamdiskhasreleased 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-ment screw (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

Electric limit switch

Pneumatic limit switch with switching function

1 Lever for valve travel1.1 Pin2 Shaft3 Switch case3.1 Adjustment screw4.1 Metal tag4.2 Cam disk5 Proximity switch6 Switch lever6.1 Roller6.2 Spring7 Electric switch8 Pneumatic switch8.1 Nozzle (in switch)8.2 Flapper (in switch)9 Pneumaticmicroswitch10 Plate attached either to

actuator stem or plug stem

Fig. 1: Functional drawings

8 EB 8365 EN

Design and principle of operation

2.2 Article code and versionsLimit switch (device index .07 and higher) Type 4746- x x x x x x x 0 x x x x

Explosion protectionWithout 0Ex II 2G Ex ia IIC T6 acc. to ATEX 1CSA/FM intrinsically safe/non incendive 3Ex II 3G Ex nA II T6 acc. to ATEX 8

TypeInductive 2 1/2Electric 3 2Pneumatic 0 4 2

ContactsProximity switch SC3,5-N0-YE 1) 2 0 0 1 0Proximity switch SJ3,5-SN 2 1 0 1 0Proximity switch SJ3,5-S1N 2 1 1 1 0SAIA, electric microswitch XGK 3 3 2 0 2 1 0SAIA, electric microswitch XGK3-81 3 2 1 2 1 0Pneumatic microswitch 0 4 4 0 2 0Proximity switch SB3,5-E2 0 2 8 1 2 1 0

Switching elementsWith one switching element 1With two switching elements 2

Electrical connectionWithout 0 4 4 0 0Plastic cable gland M20 x 1.5, black 1 0

Pneumatic connectionsWithout 0ISO 221/1-G 1/8 0 4 4 0 0 11/8 -27 NPT 0 4 4 0 0 2

Special versionsWithout 0 0 0NEPSI approval Ex ia, Type 4746-12 inductive 1 2 2 0 0 9NEPSI approval Ex nL, Type 4746-82 inductive 8 2 2 0 1 0GOST approval Ex ia, Type 4746-1... 1 2/3 0 1 3KOSHA approval Ex ia 1 2/3 0 1 5INMETRO approval, Ex ia 1 2/3 0 1 7

1) Type 4746-3200onlywithFMapproval

EB 8365 EN 9

Design and principle of operation

Compatibility with paintWithout 0Free from substances that impair paint adhesion 1

Limit switch (device index .06 or lower) Type 4746- x x x x

Type

Inductive, no explosion protection 1

Inductive, Ex ib IIC T6 2

Electric 3

Pneumatic 4

Electrical connection/lever

Without 0

Cable gland, lever I (device index .04 or higher without lever) 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 electric microswitch XGK 3 2

Pneumatic microswitch with ISO 228/1-G 1/8 connecting thread 3

Pneumatic microswitch with 1/8-27 NPT connecting thread 4

SJ3,5-N (white dot of paint), max. hysteresis with 100 mm lever = 0.6 mm 5

Microswitch (gold contacts) 6

SJ3,5-E2 with LED (three-wire switch) without explosion protection, NO contact 1 8

SB3,5-E2 (three-wire switch) without explosion protection, NO contact 1 9

Switching elements

With one switching element 1

With two switching elements 2

Note:When replacing devices with index .00 to .03, a mounting unit with lever must also be ordered. See section 2.4.

10 EB 8365 EN

Design and principle of operation

2.3 Technical dataInductive Limit Switch Type 4746-x2 Type 4746-0281

Control circuit SwitchingamplifieraccordingtoEN60947-5-6 Three-wire switchOperatingvoltage10to30V

Proximity switch SC3,5-N0-YE 2) SJ3,5-SN SJ3,5-S1N SB3,5-E2

Permissible ambient temperature 1) –20 to 70 °C –20 to 100 °C –20 to 100 °C –20 to 70 °C

with metal cable gland –40 to 70 °C –50 to 100 °C –40 to 100 °C –25 to 70 °C

Electrical connections One M20x1.5 cable gland for 5.5 to 13 mm clamping rangeScrew terminals for 0.2 to 2.5 mm² wire cross-section

Degree of protection IP 65

Weight Approx. 0.7 kg

Type 4746-x3 Electric Limit Switch · Specifications apply to silver and gold-plated contacts

Switching element Electric limit switch: changeover/SPDT (single-pole/double-throw type)

Permissible load ACvoltage:220V,6.9ADCvoltage:220V,0.25A·20V,6.9A

Permissible ambient temperature 1) –20 to 85 °C

with metal cable gland –40 to 85 °C

Electrical connections One M20x1.5 cable gland for 5.5 to 13 mm clamping rangeScrew terminals for 0.2 to 2.5 mm² wire cross-section

Degree of protection IP 65

Weight Approx. 0.7 kg

Type 4746-04 Pneumatic Limit Switch

Switching element Pneumatic limit switch with downstream pneumatic microswitch

Supply air 1.4bar(20psi),canbebrieflyoverloadedupto4bar(60psi)

Air consumption 0.04 mn3/h

Output 0 or 1.4 bar (20 psi)

Air capacity One switch closed: 0.7 mn3/h·Twoswitchesclosed:1.0mn

3/h

Permissible ambient temperature –20 to 60 °C

Degree of protection IP 54

Weight Approx. 0.75 kg

EB 8365 EN 11

Design and principle of operation

Materials

Housing and cover Powder-coated aluminum

Lever and shaft 1.4571

Cable gland M20x1.5, black polyamide

Travel range

Attachment according to IEC 60534-6(NAMUR) LeverI:7.5to60mm·LeverII:60to180mm

Attachment to Type 4763 and Type 4765 Positioner Travel same as positioner

Compliance ·

1) ObservethelimitsspecifiedintheEC-typeexaminationcertificate.2) Models manufactured until 2006 with SJ3,5-N proximity switch.

Type 4746-1 with type of protection Ex ia (ATEX)Maximumvaluesforconnectiontocertifiedintrinsicallysafecircuits

Limit Switch Type 4746-12 Type 4746-13

Limit contacts Inductive Electric

Ui 16V 16V 45V

Ii 52 mA 25 mA –

Pi 169mW 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(technicaldataspecifiedinabovetableadditionallyapply)

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

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

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

12 EB 8365 EN

Design and principle of operation

2.4 AccessoriesAccessories for attachment according to IEC 60534-6Valve Cast yoke (NAMUR rib)

(see section 3.1)Rod-type yoke (18 to 32 mm rod diameter)

(see section 3.2)Travel Up to 60 mm Up to 180 mm Up to 60 mm Up to 180 mmMounting kit order no. 1400-6713

(lever I)1400-6714

(lever II)1400-6713 (lever I)

plus 1400-53421400-6714 (lever II)

plus 1400-5342Accessories for attachment to Type 4763 and Type 4765 Positioner (see section 3.4)Mounting kit order no. 1400-6710Accessories for attachment to Type 3351 Valve (see section 3.2)Nominal size DN 15 to 50 DN 65 to 100Mounting kit order no. 1400-6585 1400-6586Accessories for attachment to Type 3591 Valve with lever II (see section 3.3)Mounting kit order no. 1402-0662Vent plugs

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

Order no. 1991-2110

2.5 Summary of explosion protection approvalsType Certificate Type of protection

4746

Number IEx 13.0040

Ex ia IIC T GbDate 17.05.2013

Validuntil 16.05.2016

STCC Number No.977 0Ex ia IIC T6X2Ex s II T6XValiduntil 01.10.2017

4746-1

Number RU C.DE.08.00744

1Ex ia IIC T6/T5/T4 Gb XDate 27.01.2015

Validuntil 26.01.2020

Number 3-KB4BO-0038

Ex ia IIC T6/T5/T4Date 31.01.2013

Validuntil 31.01.2016

EB 8365 EN 13

Design and principle of operation

Type Certificate Type of protection

4746-12

CCoE (on request)

Number GYJ15.1221

Ex ia IIC T4~T6 GbDate 16.06.2015

Validuntil 15.06.2020

4746-1x

Number PTB98ATEX2114

II 2G Ex ia IIC T6 GbDate 07.03.2003EC type examination certificate

4746-3Number 1607226 Ex ia IIC T6; Class I, Zone 0;

Class I,II, Div.1, Groups A,B,C,D,E,F,G;Class I,II, Div.2, Groups A,B,C,D,E,F,G;Date 16.09.2005

4746-324746-33

Number 3020228 Class I, Zone 0 AEx ia IICClass I,II,III; Div.1, Groups A,B,C,D,E,F,GClass I, Div.2, Groups A,B,C,D;Class II, Div,2 Groups F,G; Class III;

Date 28.02.2005

4746-8

Number RU C.DE.08.007442Ex nA IIC T6/T5/T4 Gc X2Ex ic IIC T6/T5/T4 Gc XDate 27.01.2015

Validuntil 26.01.2020

4746-82

Number GYJ15.1222XEx ic IIC T4~T6 GcEx nA IIC T4~T6 GcDate 16.06.2015

Validuntil 15.06.2020

Number PTB 02 ATEX 2012 X

II 3G Ex nA II T6Date 05.04.2002Statement of conformity

4746-83

Number PTB 02 ATEX 2012 X

II 3G Ex nA II T6Date 05.04.2002Statement of conformity

14 EB 8365 EN

Attachment to the valve

3 Attachment to the valveThe accessories listed in section 2.4 are re-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 onto the shaft (2). Tighten the fas-tening screw (1.2).

3.1 Attachment to valve with cast yoke

1. Attach the plate (10) to the valve's stem connector using two screws (10.1).

2. Attach the pin (11) to the plate (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) and O-ring (14). Make sure that the pin (11) is inserted through the wire strap (1.3) of the lever (1).

3.2 Attachment to valve with rod-type yoke

1. Attach the plate (10) to the valve's stem connector using two screws (10.1).

2. Attach the pin (11) to the plate (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 support until the center of the plate (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) and O-ring (14). Make sure that the pin (11) is inserted through the wire strap (1.3) of the lever (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

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

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

Fig. 2: Attachment to the valve

16 EB 8365 EN

Attachment to the valve

3.3 Attachment to Type 3591 Valve

Î Use the supplied washers for all screw connections.

1. Fasten the round brackets (1) using the clamps (3) and nuts (2) lightly onto the valve yoke.

2. Screw tight the bar (4) using the screws (5) onto the clamps (3).

3. Fasten the limit switch (6) onto the bar (4) as described in step 3 of section 3.1. Use the thread (7) in the bar.

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

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

6. Insert the pin (13) into the oblong hole of the follower clamp (11). Make sure that the pin is inserted through the wire strap of the follower clamp.

7. Thread the nut (14) onto the pin (13). Place the clamp (16) over the lever (15) of the limit switch (6).

8. Use the nut (17) to fasten the lever (15) onto the lever extension (18).

9. Fasten the other end of the lever exten-sion (18) to the follower clamp (11).

10. Perform alignment.The following applies concerning attach-ment:

Î Perform the alignment in such a way that the lever (15), lever extension (18) and

oblong hole of the follower clamp (11) are in line with each other.

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

7

1614138

9

10

11

17

121 Round clamp2 Nut3 Clamp4 Bar5 Screws6 Limit switch7 Thread8 Anti-rotationfixture9 Mountingbracket10 Screws11 Follower clamp12 Nut and bolt13 Pin14 Nut15 Lever II16 Clamp (for lever)17 Nut18 Lever extension

Fig. 3: Attachment to Type 3591 Valve

815

11

18

10

9

453

1

2

6

18 EB 8365 EN

Attachment to the valve

3.4 Attachment to positionerFor attachment of the limit switch to the Type 4763or4765PositioneraccordingtoFig. 4, a short lever (1) and an intermediate piece (31) are required as accessories (order no. 1400-6710).1. Insert one O-ring (30) into both the left

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

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

3. Insert the nuts (32) into the positioner housingandscrewtightthetwofillisterhead screws (33).

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

4. Replace the vent plug (17) in the posi-tioner housing with the screw plug in-cluded in the accessories (order no. 1400-6710).In exchange, insert the vent plug into the housing of the limit switch. This ensures that the degree of protection of the limit switch corresponds to that of the posi-tioner.

Î To achieve degree of protection IP 65, a checkvalve(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 ensuring that the vent plug (17) faces downward after the valve is installed.

Lever with spring

Sectional view A – 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

DANGER!For electrical installation, observe the relevant electrotechnical regulations and the accident prevention regula-tions that apply in the country of use. In Germany, these are the VDE regu-lations and the accident prevention regulations of the employers’ liability insurance.The following regulations apply to installation in hazardous areas: EN 60079-14:2008 (VDE 0165, Part 1) Explosive Atmospheres – Elec-trical Installations Design, Selection and Erection.

NOTICEAdhere to the terminal assignment! Switching the assignment of the elec-trical terminals may cause the explo-sion protection to become ineffec-tive. Do not loosen enameled screws in or on the housing. The maximum permissible values specified in the EC-type examination certificates ap-ply when interconnecting intrinsically safe electrical equipment. (Ui and U0, Ii and I0, Pi and P0, Ci and C0 as well as Li and L0)

Note on the selection of cables and wires:Observe clause 12 of EN 60079-14 (VDE 0165, Part 1) for installation of the intrinsically safe circuits. Clause 12.2.2.7 applies when run-ning multi-core cables and wires with more than one intrinsically safe cir-cuit.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 diame-ter of an individual wire in a fine-stranded conductor must not be smaller than 0.1 mm. Protect the con-ductor ends against splicing, e.g. by using wire-end ferrules.When two separate cables are used for connection, an additional cable gland can be installed. Seal cable en-tries left unused with plugs. Fit equip-ment used in ambient temperatures be-low –20 °C with metal cable entries.

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 installa-tion, maintenance or repair.Equipment connected to energy-lim-ited circuits with type of protection Ex nL (energy-limited equipment) ac-cording to EN 60079-15:2003 may be switched under normal operating conditions. The maximum permissi-ble 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.

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.The following accessories are available:Cable gland M20 x 1.5:Black plastic, with washer Order no. 8808-0180Blue plastic, with washer Order no. 8808-0181Nickel-platedbrass Orderno.1890-4875Adapter M20x1.5 to ½ NPT:Powder-coated aluminum Orderno.0310-2149Device index .06 and lowerBlack plastic Order no. 8808-0178Blueplastic Orderno.8808-0179

4.1.1 Switching amplifier for Type 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 1/8 ISO 228 or 1/8-27 NPT thread.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

Voltagesupply10to30V

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.The adjusted switch positions can be record-ed on the supplied adhesive labels marked A, B and C, and assigned to the correspond-ing switching elements.

3.14.1, 4.2

42(52)

42(52)

41(51)43(53)

41(51)43(53)

A A

3.1 Adjustment screw4.1 Metal tag4.2 Cam disk

Type 4746-x2Inductive Limit Switch

Type 4746-0281Close three-wire sensor PNP

Type 4746-x3Electric Limit Switch

Type 4746-04Pneumatic Limit Switch

Open

Supply air applied

Open

Closed

Supply air cut off

Closed

Fig. 6: Limit contacts

5.1.1 Type 4746-x2 Î Move the valve to the switching position and turn the adjustment screw (3.1) until the metal tag (4.1) reaches the switching point.

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

EB 8365 EN 23

Operation

Note:The switching elements and the le-vers required to activate them react to temperature fluctuations. To ensure reliable switching, the switching hys-teresis between the mechanical stop (e.g. plug in the seat) and the switch-ing point of the limit switch must be larger than the displacement of the switching point caused by the tem-perature change.

Distance between switching points for 100 mm lever:ContactSC3,5-N0-YE ≥2mm,ContactSJ3,5-SN ≥0.75mm.With other lever lengths, adjust the switching point to the changed lever length.For example, if the lever length changes from 100to160 mm,thedistancebetweentheswitching points is increased from 2.0 to 3.2 mmcorrespondingly.

Simplified adjustment of the inductive limit switches:Valve CLOSED:Close the valve until the plug sits in the seat.Valve OPEN:Move the valve to the desired travel position, e.g.finalposition. − Turn the adjustment screw (3.1) to slowly

move the metal tag (4.1) towards the contact until the switching point is reached.

− Turn the adjustment screw in the opposite direction to achieve that the switching point reaches the stop after

− contactSC3,5-N0-YE ≥1/6 turncontactSJ3,5-SN ≥1/16 to 1/10 turn

If the adjustment is performed carefully, the distances between the switching points speci-fiedaboveapply.

5.1.2 Type 4746-x3 and Type 4746-04

Î For adjustment, the cam disk (4.2) has to be positioned in such a way that its cam moves towards the roller (6.1, Fig. 1) in accordance 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. Turn the adjustment screw (3.1) until the cam of the cam disk (4.2) reaches the roller (6.1, Fig. 1) and the switch chang-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

If a part of the device on which the explosion protection is based needs to be serviced, the device must not be put back into operation untilaqualifiedinspectorhasassesseditac-cording to explosion protection require-ments,hasissuedaninspectioncertificateorgiven the device a mark of conformity.Inspectionbyaqualifiedinspectorisnotre-quired if the manufacturer performs a rou-tine test on the device prior to putting it back into operation. Document the passing of the routine test by attaching a mark of conformi-ty to the device.Replace explosion-protected components on-ly by original, routine-tested components provided 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-viced devices. Before being operated inside hazardous areas, test the devices according tothespecificationsforservicingexplosion-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 only with intrinsically safe current/voltage calibrators and measuring instruments to rule out any damage to components relevant to explosion protection.

Î Observe the maximum permissible val-uesspecifiedinthecertificatesforintrin-sically safe circuits.

EB 8365 EN 25

Dimensions

8 Dimensions

27.5

9444

.5

1837

1883

7492

1583

20.6

27,5

74 189

15

9464

44.5

M 20x1.5

7771 30

148

7771 30

148

Type 4746-x2 and Type 4746-x3Air connection for separate air supply, tapped hole G 1/8

Intermediate piece for attachment to positioner

M8 fastening screw M8 fastening screw

Output

Supply air

Pneumatic connections

L I/L

II

L I/L

II

NAMUR rib NAMUR rib

Type 4746-04Air connections, tapped hole G 1/8 or 1/8 NPT

Lever length L I/L IILeverI: 149mmLever II: 202 mm

26 EB 8365 EN

Certificates

9 Certificates

Note: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.

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

16-02-02·English