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Electric or Pneumatic Limit Switch Type 4746 Mounting and Operating Instructions EB 8365 EN Edition July 2011 Fig. 1 · Type 4746 Limit Switch

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Page 1: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

Electric or Pneumatic Limit SwitchType 4746

Mounting andOperating Instructions

EB 8365 ENEdition July 2011

Fig. 1 · Type 4746 Limit Switch

Page 2: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

Contents

1 Design and principle of operation. . . . . . . . . . . . . . . . . . . . 41.1 Principle of operation . . . . . . . . . . . . . . . . . . . . . . . . . . 41.1.1 Type 4746-x2 Inductive Limit Switch . . . . . . . . . . . . . . . . . . . 41.1.2 Type 4746-x3 Electric Limit Switch. . . . . . . . . . . . . . . . . . . . 41.1.3 Type 4746-04 Pneumatic Limit Switch . . . . . . . . . . . . . . . . . . 41.2 Versions (article code). . . . . . . . . . . . . . . . . . . . . . . . . . 61.3 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2 Attachment to control valve . . . . . . . . . . . . . . . . . . . . . . 102.1 Attachment to valve with cast yoke . . . . . . . . . . . . . . . . . . . 102.2 Attachment to valve with rod-type yoke . . . . . . . . . . . . . . . . . 102.3 Attachment to positioner . . . . . . . . . . . . . . . . . . . . . . . . 12

3 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133.1 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . 133.1.1 Switching amplifier for Type 4746-x2 . . . . . . . . . . . . . . . . . 143.2 Pneumatic connection for Type 4746-04 . . . . . . . . . . . . . . . . 14

4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154.1 Adjusting the switching point . . . . . . . . . . . . . . . . . . . . . . 154.1.1 Type 4746-x2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154.1.2 Type 4746-x3 and Type 4746-04 . . . . . . . . . . . . . . . . . . . 16

5 Servicing explosion-protected versions. . . . . . . . . . . . . . . . . 17

6 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7 Approvals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2 EB 8365 EN

Contents

Page 3: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

EB 8365 EN 3

Safety instructions

General safety instructions

� The device is to be mounted, started up or operated only by trained andexperienced personnel familiar with the product.According to these Mounting and Operating Instructions, trained personnelrefers to individuals who are able to judge the work they are assigned to andrecognize possible dangers due to their specialized training, their knowledgeand experience as well as their knowledge of the applicable standards.

� Explosion-protected versions of this device may only be operated by personnelwho have undergone special training or instructions or who are authorized towork on explosion-protected devices in hazardous areas. Refer to section 5.

� Any hazards that could be caused by the process medium, the operatingpressure, the signal pressure or by moving parts of the control valve are to beprevented by means of the appropriate measures.If inadmissible motions or forces are produced in the actuator as a result ofthe supply pressure, the supply pressure must be restricted by means of asuitable supply pressure reducing station.

� Proper shipping and appropriate storage are assumed.

� Note: The device with a CE marking fulfills the requirements of the Directives94/9/EC (ATEX) and 89/336/EEC (EMC).The Declaration of Conformity is available on request.

Page 4: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

1 Design and principle ofoperation

The limit switches are attached to pneumaticcontrol valves as well as to Type 4765 andType 4763 Positioners.

These limit switches have with either induc-tive, electric or pneumatic contacts. They is-sue a signal when the valve travel exceedsor falls below a limit, especially when a con-trol valve has reached its final position. Thissignal is transmitted, e.g. to an alarm or in-dicating system.

1.1 Principle of operation

The valve travel is transmitted either directlyto the pin (1.1) and lever (1) of the limitswitch by the plate (10) or by a coupling pinwhen a positioner is attached. The lineartravel is converted into a rotary motion bythe shaft (2).

1.1.1 Type 4746-x2 Inductive LimitSwitch

In this version, the shaft (2) carries twoswitch cases (3) with adjustable metal tags(4.1) for non-contact activation of the inte-grated proximity switches (5).

For the operation of inductive limit switches(except for Type 4746-0281), appropriateswitch amplifiers must be integrated into theoutput circuit.

The switching function and switching pointare continuously adjustable using theadjustment screw (3.1).

1.1.2 Type 4746-x3 Electric LimitSwitch

In this version, the shaft (2) carries twoswitch cases (3) with adjustable cam discs(4.2). Each cam disc activates an electricdouble-throw switch (7) over the roller (6.1),which is attached to the switch lever (6).

The switching function and switching pointare continuously adjustable using the adjust-ment screw (3.1).

1.1.3 Type 4746-04 PneumaticLimit Switch

In this version, the shaft (2) carries twoswitch cases (3) with adjustable cam discs(4.2). Each cam disc activates a nozzle/flapper system in the pneumatic switch (8).

Whenever the cam disc (4.2) activates theswitch lever (6) over the roller (6.1), the noz-zle in the pneumatic switch (8) is openedand the supply air is switched through toport A1 or A2 by the microswitch (9). Thenozzle is closed in the pneumatic switch (8)and the supply air applied to the mi-croswitch is cut off first when the cam dischas released the switch lever (6). As a result,pressure is no longer applied to ports A1 orA2.

The switching function and switching pointare continuously adjustable using the adjust-ment screw (3.1).

4 EB 8365 EN

Design and principle of operation

Page 5: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

EB 8365 EN 5

Design and principle of operation

Fig. 2 · Functional diagrams

3.13

5

L

10

4.1 1 1.12

Inductive limit switch

L

3.13

1076.26.16

4.2 1 1.12

Electric limit switch

L

3.13

4.2 1 1.12

1086.26.16

Pneumatic limit switch with switching function

A1 A29 9

8.2 8.1 8.1 8.2

pz

1 Lever for valve travel1.1 Pin2 Shaft3 Switch case3.1 Adjustment screw4.1 Metal tag4.2 Cam disc5 Proximity switch6 Switch lever6.1 Roller6.2 Spring7 Electric switch8 Pneumatic switch8.1 Nozzle (in switch)8.2 Flapper (in switch)9 Pneumatic microswitch10 Plate attached either to

actuator stem or plug stem

Page 6: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

1.2 Versions (article code)

6 EB 8365 EN

Versions

Limit switch (device index .07 or higher) Type 4746- x x x x 2 x x 0 x x x 0

Explosion protection

Without 0

II 2 G Ex ia IIC T6 according to ATEX 1

CSA/FM intrinsically safe/non incendive 3

II 3 G Ex nA II T6 according to ATEX 8

Type

Inductive 2

Electric 3

Pneumatic 0 4

Contacts

Proximity switch SC 3,5-NO (NAMUR NC contact) 2 0 0 1 0

Proximity switch SJ 3,5-SN(NAMUR NC contact in safety circuit) 2 1 0 1 0

Proximity switch SJ 3,5-S1N(NAMUR NO contact in safety circuit) 2 1 1 1 0

SAIA - electric microswitch XGK 3(silver contacts) 3 2 0 1 0

SAIA - electric microswitch XGK3-81(gold-plated contacts) 3 2 1 1 0

Pneumatic microswitch 0 4 4 0 0

Proximity switch SB 3,5-E2(three-wire switch), NO contact 0 2 8 1 1 0

Electrical connection

Without 0 4 4 0 0

Cable gland M20 x 1.5 black (plastic) 1 0

Pneumatic connection

Without 0

ISO 228/1 - G 18 0 4 4 0 0 1

18-27 NPT 0 4 4 0 0 2

Page 7: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

EB 8365 EN 7

Versions

Limit switch (device index .07 or higher) Type 4746- x x x x 2 x x 0 x x x 0

Special versions

None 0 0 0

NEPSI approval Ex ia, Type 4746-12 inductive 1 2 2 0 0 9

NEPSI approval Ex nL, Type 4746-82 inductive 8 2 2 0 1 0

GOST approval, Ex ia, Type 4746-1... 1 2/3 0 1 3

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

Type Inductive Without explosion protectionEEx ib IIC T6

12

ElectricPneumatic

34

Electrical connection/lever

Without 0

Cable gland, lever I (device index .04 or higher without lever) 1

Cable gland, lever II for postioner attachment 2

½” USA cable gland, lever I 3

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

Contacts SJ 3,5-N 0

SJ 3,5-SN 1

SAIA - electric microswitch XGK 3 2

Pneumatic microswitch with ISO 228/1-G 18 connecting thread 3

Pneumatic microswitch with 18-27 NPT connecting thread 4

SJ 3,5-N (white dot of paint)max. hysteresis with 100 mm lever = 0.6 mm

5

Microswitches (gold contacts) 6

SJ 3,5-E2 with LED (three-wire switch) without explosion protection,NO contact

1 8

SB 3,5-E2 (three-wire switch) without explosion protection, NO contact 1 9

Switching elements 1 1

2 2

Note: When replacing devices with index .00 to .03, a mounting unit with lever as listed in the table on page 10must also be ordered.

Page 8: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

1.3 Technical data

8 EB 8365 EN

Technical data

Inductive Limit Switch Type 4746-x2 Type 4746-0281

Control circuit Switching amplifier acc. to EN 60947-5-6 Three-wire switchOperating voltage 10 to 30 V

Proximity switch SC 3,5-NO 2) SJ 3,5-SN SJ 3,5-S1N SB 3,5-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 connection One cable gland M20 x 1.5 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 AC voltage: 220 V, 6.9 ADC voltage: 220 V, 0.25 A � 20 V, 6.9 A

Permissible ambient temperature 1) –20 to 85 °C

with metal cable gland –40 to 85 °C

Electrical connection One cable gland M20 x 1.5 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 1.4 bar (20 psi), can be briefly overloaded up to 4 bar (60 psi)

Air consumption 0.04 mn3/h

Output 0 or 1.4 bar (20 psi)

Air output capacity One switch closed: 0.7 mn3/h

Two switches closed: 1.0 mn3/h

Permissible ambient temperature –20 to 60 °C

Degree of protection IP 54

Weight Approx. 0.75 kg

Page 9: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

EB 8365 EN 9

Technical data

Inductive Limit Switch Type 4746-x2 Type 4746-0281

Materials

Case and cover Aluminum, powder-coated

Lever and shaft 1.4571

Cable gland M20 x 1.5 � Black polyamide

Travel range

Attachment acc. to IEC 60534-6 Lever I: 7.5 to 60 mm · Lever II: 60 to 180 mm

Attachment to Type 4763 andType 4765 Positioner Travel same as positioner

1) Observe the limits concerning permissible ambient temperatures specified in the EC Type Examination Certificate.2) Models manufactured until 2006 with SJ 3,5 N proximity switch.

Technical data for Type 4746-1 with type of protection Ex ia (ATEX)Maximum values for connection to certified intrinsically safe circuits

Limit Switch Type 4746-12 Type 4746-13

Contacts Inductive Electric

Ui 16 V 16 V 45 V

Ii 52 mA 25 mA –

Pi 169 mW 64 mW 2 W

Ci - Effective internal capacitance 60 nF 50 nFNegligibly small

Li - Effective internal inductance 160 �H 250 �H

Temperature classes Ambient temperature range according to EC Type Examination Certificate(Technical data specified in Table 1 additionally apply)

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

Page 10: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

2 Attachment to control valve

For attachment of the limit switch to a con-trol valve, the accessories listed in the tablebelow are required.

The lever (I or II) must be installed before thelimit 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 theshaft (2) together. Tighten the fasteningscrew (1.2).

2.1 Attachment to valve with castyoke

1. Attach the plate (10) to the valve's stemconnector 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.Attach the limit switch to the valve yokeusing the mounting screw (12), washer(13) and O-ring (14). Make sure that thepin (11) is inserted through the wirestrap (1.3) of the lever (1).

2.2 Attachment to valve withrod-type yoke

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

2. Attach the pin (11) to the plate (10) us-ing two nuts (11.1).

3. Attach the support (15) and the rodclamping plate (16) to the rod. Screwthem together loosely.In the valve travel mid-position, move thesupport until the center of the plate (10)and the support (15) are aligned.

4. Tightly screw the rod clamping plate tothe support.

5. Attach the limit switch to the support us-ing the mounting screw (12), washer(13) and O-ring (14). Make sure that thepin (11) is inserted through the wirestrap (1.3) of the lever (1).

Note: After attaching the limit switch, makesure that the vent plug of the housing coverfaces downward when the valve is installed.

10 EB 8365 EN

Attachment to control valve

Accessories for attachment according to IEC 60534-6

Valve Cast yoke (NAMUR rib) Rod-type yoke (18 to 32 mm rod diameter)

Travel Up to 60 mm Up to 120 mm Up to 60 mm Up to 120 mm

Mounting kitorder no.

1400-6713(lever I)

1400-6714(lever II)

1400-6713 (lever I)plus 1400-5342

1400-6714 (lever II)plus 1400-5342

Accessories for attachment to Type 4763 and Type 4765 Positioner

Mounting kit Order no. 1400-6710

Accessories for attachment to Type 3351 Valve

Nominal size DN 15 to 50 DN 65 to 100

Mounting kit Order no. 1400-6585 Order no. 1400-6586

Page 11: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

EB 8365 EN 8365 EN 11

Attachment to control valve

Attachment to valve with rod-type yoke

1 Lever1.1 Clamping plate1.2 Fastening screw1.3 Wire strap2 Shaft10 Plate10.1 Screws11 Pin11.1 Nuts12 Mounting screw13 Washer14 O-ring15 Support16 Rod 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

Fig. 3 · Attachment to the valve

Attachment to valve with cast yoke (NAMUR rib)

Page 12: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

2.3 Attachment to positioner

For attachment of the limit switch to theTypes 4763 or 4765 Positioners accordingto Fig. 4, a short lever (1) and an intermedi-ate piece (31) are required as accessories(order no. 1400-6710).

1. Insert one O-ring (30) into the left andthe right side of the intermediate piece(31).

2. Push the two fillister head screws (33)through the limit switch and intermediatepiece, and insert them into thepositioner.

3. Fasten the two fillister head screws (33)in the positioner housing using the

nuts (32). Make sure that the short lever(1) slides over the pin (16) of thepositioner.

4. Replace the vent plug (17) in thepositioner housing with the screw plugincluded in the accessories (order no.1400-6710). In exchange, insert thevent plug into the housing of the limitswitch. This ensures that the IP degree ofprotection of the limit switch correspondsto that of the positioner.

� To achieve degree of protection IP 65, acheck valve (order no. 1790-7408)needs to be installed in the housing ofthe limit switch.

12 EB 8365 EN

Attachment to control valve

17

A B

3031

161

31

32

33

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

Lever with spring

Sectional view A – B

Note: Attach the housing cover to the limit switchensuring that the vent plug (17) faces downwardafter installation of the valve is completed.

Page 13: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

3 Connections

3.1 Electrical connection

For electrical installation, observe therelevant national electrotechnicalregulations and the accident preven-tion regulations that apply in thecountry of use.The following standard applies forinstallation in hazardous areas:EN 60079-14: 2008 (VDE 0165Part 1) Explosive atmospheres -Electrical installations design, selec-tion and erection.

NOTICE– Adhere to the terminal assignment!– Switching the assignment of the electrical

terminals may cause the explosion pro-tection to become ineffective!

– Do not loosen enameled screws in or onthe housing.

– The maximum permissible values speci-fied in the national EC type examinationcertificates apply when interconnectingintrinsically safe electrical equipment(Ui, Ii, Pi, Ci and Li).

Selecting cables and wires:

Observe Clause 12 of EN 60079-14: 2008when installing intrinsically safe circuits. TheSubclause 12.2.2.7 applies when runningmulti-core cables containing more than oneintrinsically safe circuit.

In particular, the radial thickness of the con-ductor insulation for common insulation ma-terials, such as polyethylene, must have aminimum radial thickness of 0.2 mm.

The diameter of an individual wire in afine-stranded conductor must not be smallerthan 0.1 mm. Protect the conductor ends

EB 8365 EN 13

Connections

41 42 51 52 42 41 43 52 51 53

GW1 GW2

+ _ _+GW1 GW2

41 42L+ L- 51 52

+ _ _+

GW1 GW2

Fig. 5 · Electrical connection

Type 4746-x2 Type 4746-0281 Type 4746-x3

Switching amplifier acc.to EN 60947-5-6 Three-wire version

Voltage supply 10 to 30 V

Page 14: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

against splicing, e.g. by using wire-end fer-rules.

Devices used at ambient temperatures be-low –20 °C must be fitted with metal cableglands.

Equipment for use in zone 2/zone 22

In equipment operated with type of protec-tion Ex nA II (non-sparking equipment) ac-cording to EN 60079-15: 2003, circuitsmay be connected, interrupted or switchedwhile energized only during installation,maintenance or repair.

Cable entries

The lines for the electric control signal mustbe routed through the cable gland on thehousing and connected to the input termi-nals marked + and – as illustrated in Fig. 5or according to the adhesive label on the in-side of the cover.

The following accessories are available:

Cable gland M20 x 1.5:Plastic, black, with washer

Order no. 8808-0180Plastic, blue, with washer

Order no. 8808-0181Nickel-plated brass Order no. 1890-4875Adapter M20 x 1.5 to NPT:Aluminum, powder-coated

Order no. 0310-2149Device index .06 and lowerPlastic, black Order no. 8808-0178Plastic, blue Order no. 8808-0179

3.1.1 Switching amplifier forType 4746-x2

For operation of the inductive limit switches,switching amplifiers in accordance withEN 60947-5-6 have to be connected in theoutput circuit (not for Type 4746-0281).

For installation in hazardous areas, the rele-vant regulations must be observed.

3.2 Pneumatic connection forType 4746-04

The air connections are tapped holes withG 1

8 ISO 228 or 18-27 NPT thread. Stan-

dard screw fittings for metal pipes or plastichoses can be used.

14 EB 8365 EN

Connections

Page 15: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

4 Operation

4.1 Adjusting the switching point

The limit switches attached to the controlvalves are usually adjusted in such a waythat a signal is issued when the final travelpositions are reached. Optionally, theswitching point can also be adjusted to anyposition within the travel range, e.g. if an in-termediate position is to be indicated.

The adjusted switch positions can be re-corded on the supplied adhesive labelsmarked A, B and C, and assigned to thecorresponding switching elements.

4.1.1 Type 4746-x2

Move the valve to the switching position andturn the adjustment screw (3.1) until themetal tag (4.1) reaches the switching point.

Always move the valve to the final travel po-sitions from an intermediate position to ad-just or check the switching point!

Note: The switching elements and the leversrequired to activate them react to tempera-ture fluctuations. To ensure reliable switch-ing, the switching hysteresis between themechanical stop (e.g. plug in the seat) andthe switching point of the limit switch mustbe larger than the displacement of the

3.14.1, 4.2

42(52)

42(52)

41(51)43(53)

41(51)43(53)

A A

Fig. 6 · Limit switches

Type 4746-x2Inductive Limit Switch

Type 4746-0281Close three-wire sensorPNP

Type 4746-x3Electric Limit Switch

Type 4746-04Pneumatic Limit Switch

3.1 Adjustment screw4.1 Metal tag4.2 Cam disc

Open

Open

Closed

Closed

Supply air applied Supply air cut off

EB 8365 EN 15

Operation

Page 16: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

switching point caused by the temperaturechange.

Distance between switching points for100 mm lever:

Contact SC 3,5-NO � 2 mm,Contact SJ 3,5-SN � 0.75 mmWith other lever lengths, adjust the switchingpoint to the changed lever length.For example, if the lever length changesfrom 100 mm to 160 mm, the distance bet-ween the switching points is increased from2.0 mm to 3.2 mm correspondingly.

Simplified adjustment of the inductive limitswitches:

Valve CLOSED:Close the valve until the plug sits in the seat

Valve OPEN:Move the valve to the desired travel position,e.g. final position.

� Turn the adjustment screw (3.1) to slowlymove the metal tag (4.1) towards thecontact until the switching point isreached.

� Turn the adjustment screw in the oppositedirection to achieve that the switchingpoint reaches the stop aftercontact SC 3,5-NO = � 1/6 turn andcontact SJ 3,5-SN = � 1/16 to 1/10turn.

If the adjustment is performed carefully, thedistances between the switching points spec-ified above apply.

4.1.2 Type 4746-x3 andType 4746-04

For adjustment, the cam disc (4.2) has to bepositioned in such a way that its cam movestowards the roller (6.1, Fig. 2) in accor-dance with the direction of travel.

Move the control valve to the desired switch-ing position (e.g. final travel position "valveOPEN" or "valve CLOSED").

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

Turn the adjustment screw (3.1) until thecam of the cam disc (4.2) reaches the roller(6.1, Fig. 2) and the switch changes over.To accurately check the switching point,move the valve slightly backward and moveit to the switching position again.

16 EB 8365 EN

Operation

Page 17: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

5 Servicing explosion-protectedversions

If a part of the limit switch on which the ex-plosion protection is based needs to be ser-viced, the limit switch must not be put backinto operation until an expert has inspectedthe device according to explosion protectionrequirements, has issued a certificate statingthis or given the device a mark of confor-mity.

Inspection by an expert is not required if themanufacturer performs a routine check onthe device prior to putting it back into oper-ation. The passing of the routine check mustbe documented by attaching a mark of con-formity to the device.

Explosion-protected components may onlybe replaced by original, checked compo-nents from the manufacturer.

Devices that have already been used outsideof hazardous areas and are intended foruse in hazardous areas in future must com-ply with the safety demands placed on re-paired devices. Prior to operation, they mustbe tested according to the specifications stip-ulated for "Servicing explosion-protecteddevices".

EB 8365 EN 17

Servicing explosion-protected versions

Page 18: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

6 Dimensions

18 EB 8365 EN

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

NAMUR rib

Mounting screw M8

NAMUR rib

Type 4746-x2, -x3Air connection for separate airsupply, tapped hole G 1

8

Type 4746-04Air connections, tapped hole G 1

8

or 18 NPT

Output

Supplyair

Mounting screw M8

Air connections

Intermediate piece forattachment to positioner

LI/

LII Lever length L I/L II

Lever I: 149 mmLever II: 202 mm

LI/

LII

Page 19: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

7 Approvals

Approvals

EB 8365 EN 19

Not

e:

The

type

desig

natio

nsof

the

Type

s47

46-2

and

4746

-3Lim

itSw

itche

sha

vebe

ench

ange

d.Th

ece

rtific

ates

ofco

nfor

mity

rem

ain

valid

.See

fax

(Ger

man

only

)for

deta

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Page 20: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

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Page 23: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

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Page 29: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

EB 8365 EN 29

Page 30: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

30 EB 8365 EN

Page 31: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

EB 8365 EN 31

Page 32: Mounting and Operating Instructions EB 8365 EN Positioners and Limit... · The Declaration of Conformity is available on request. 1 Design and principle of operation ... 321 10 Pneumatic

SAMSON AG · MESS- UND REGELTECHNIKWeismüllerstraße 3 · 60314 Frankfurt am Main · GermanyPhone: 069 4009-0 · Fax: 069 4009-1507Internet: http://www.samson.de EB 8365 EN 20

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