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EB 8356 EN

Design and principle of operation

2.2

Versions and article code

Limit switch

Type 3768- x

Explosion protection
Without

2/7

II 2G Ex ia IIC T6 acc. to ATEX

CSA/FM intrinsically safe/non incendive

II 3G Ex nA II T6 acc. to ATEX

2/7

Solenoid valve
Without

6 V DC

12 V DC

24 V DC

Pneumatic connections
Without

¼-18 NPT

ISO 221/1-G ¼

Electrical connection

Plastic cable gland M20x1.5, blue

Plastic cable gland M20x1.5, black

Cable gland M20x1.5, nickel-plated brass

Body version
Aluminum

CrNiMo steel

Temperature range
Standard

–45 to 80 °C

Special versions
On request

Содержание 3768

Страница 1: ...Mounting and Operating Instructions EB 8356 EN Edition February 2013 Type 3768 Inductive Limit Switch ...

Страница 2: ...s Î Î For the safe and proper use of these instructions read them carefully and keep them for later reference Î Î If you have any additional questions not related to the contents of these instructions con tact SAMSON s After sales Service department aftersalesservice samson de The mounting and operating instructions for all supplied devices are included in the delivery The latest versions of the d...

Страница 3: ...to IEC 60534 6 12 3 2 1 Mounting sequence 12 3 2 2 Initial adjustment of travel 14 3 3 Attachment to rotary actuators 14 3 3 1 Mounting the lever with feeler roll 14 3 3 2 Mounting the intermediate piece 14 3 3 3 Aligning the cam disk 16 3 3 4 Reversing amplifier for double acting actuators 18 4 Electrical connections 24 4 1 Pneumatic connections for version with solenoid valve 27 5 Operation Adju...

Страница 4: ......

Страница 5: ...is 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 See 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 taking appropriate precautions If in admissible motions or forces are p...

Страница 6: ...2 transfers this rota ry motion to two adjustable metal tags 4 which operate the associated proximity switches 5 The operation of the inductive limit switches requires switching amplifiers to be connected in the output circuit see section 4 Version with solenoid valve When fitted with a solenoid valve the con trol valve can be moved to the fail safe posi tion regardless of the control signal issue...

Страница 7: ...ir Supply air 1 4 to 6 bar 20 to 90 psi Input Binary DC voltage signal Nominal signal 6 V DC 12 V DC 24 V DC Signal 0 no response 1 1 2 V 2 4 V 4 7 V Signal 1 response 2 5 4 V 9 6 V 18 0 V Coil resistance Ri at 20 C 2909 Ω 5832 Ω 11714 Ω KV coefficient 0 14 m h Air consumption OFF 60 ln h ON 10 ln h Closing time with Type 3277 Actuator 240 cm 350 cm 700 cm For rated travel with bench range 0 2 to ...

Страница 8: ... non incendive 3 II 3G Ex nA II T6 acc to ATEX 8 2 7 Solenoid valve Without 0 6 V DC 2 12 V DC 3 24 V DC 4 Pneumatic connections Without 0 0 18 NPT 1 ISO 221 1 G 2 Electrical connection Plastic cable gland M20x1 5 blue 1 0 Plastic cable gland M20x1 5 black 2 0 Cable gland M20x1 5 nickel plated brass 7 2 Body version Aluminum 0 CrNiMo steel 2 Temperature range Standard 0 45 to 80 C 2 Special versio...

Страница 9: ... Class I II Div 2 Groups A B C D E F G Date 2005 06 19 No 3020228 Class I Zone 0 AEx ia IIC Class I II III Div 1 Groups A B C D E F G Class I Div 2 Groups A B C D Class II Div 2 Groups F G Class III Date 2005 02 28 3768 8 Number GYJ15 1219X Ex ic IIC T4 T6 Gc Ex nA IIC T4 T6 Gc Date 2015 06 16 Valid until 2020 06 15 Number PTB 03 ATEX 2182 X II 3G Ex nA II T6 Date 2003 09 30 Statement of conformit...

Страница 10: ...the intermediate plate making sure that the lever D1 or D2 slides in line over the pin 1 1 of the clamp 1 2 5 Mount cover 18 6 Mount the vent plug suitable for the cor responding degree of protection on the cover 18 3 1 1 Attachment of version with solenoid valve To establish the signal pressure connection to the actuator use a connection block or swi tchover plate listed in the tables in page 20 ...

Страница 11: ...retracts Signal pressure connection internal over pipe connection With switch plate old Switch plate 13 Marking Marking Actuator stem retracts Symbol for actuator stem retracts Symbol for actuator stem retracts Signal pressure input for left attachment Signal pressure input for right attachment Tip of gasket 16 extends extends Clamp extends Cover Side view of connection block with gaskets new Fig ...

Страница 12: ... the pin 27a on the lever of the limit switch To ensure that the pin 27a is properly locat ed in the bracket 28 fix the spring includ ed in the accessories at the back of the posi tioner housing as illustrated in Fig 3 The limit switch can be mounted either on the left or right side of the valve Spring Screw plug Fig 3 Installing the spring on the back 3 2 1 Mounting sequence Î Î Select the requir...

Страница 13: ...ter 25 Shaft 26 Lever of positioner 27a Coupling pin 27b Lock nut 28 Bracket 29 Studs 30 Plate 31 Nuts 32 Mounting bracket 2 1 5 1 28 26 A B 24 25 22 32 31 20 19 19 21 20 23 18 27b 27a 29 30 Mounting position Attachment to NAMUR rib Attachment to rods Fig 4 Attachment according to NAMUR shown for left attachment ...

Страница 14: ...in position with the hex nut 27b on the other side observing the mounting position A or B according to Table 6 and Fig 4 5 Place the limit switch on the adapter housing taking into account the mount ing direction Fasten it making sure that the pin 27a rests against the bracket 28 Make sure the pin does not slip out of the bracket once installed 3 3 Attachment to rotary actu ators The limit switch ...

Страница 15: ...45 Gasket 33 Limit switch 34 Intermediate piece 35 Lever with feeler roll 36 Adapter 37 Transmission lever 38 Screws 39 Dial plate 33 38 35 39 39 40 34 36 40 34 44 45 42 43 37 Attachment to SAMSON Type 3278 Attachment according to VDI VDE 3845 Vent plug or filter check valve Fig 5 Attachment to rotary actuators ...

Страница 16: ...r check valve from the accessories into the intermedi ate piece 3 3 3 Aligning the cam disk Î Î Refer to Fig 6 The following applies on aligning the cam disk Î Î The cam disk alignment depends on the valve s direction of rotation i e whether it opens clockwise or counterclockwise Î Î The cam disk must be set when the valve is closed Î Î Align the starting point hole of the cam so that the fulcrum ...

Страница 17: ... to the valve 90 6 0 30 0 0 90 6 0 30 Feeler roll Starting point Starting point Insert clip and press the flaps outwards Valve opens in counterclockwise direction Valve closes in clockwise direction Fig 6 Aligning the cam disk ...

Страница 18: ...ions of the limit switch 3 Insert the gasket 1 2 into the recess of the reversing amplifier and slide both the hollowed special screws 1 1 into the connecting boreholes A1 and Z 4 Place the reversing amplifier onto the limit switch and screw tight using the two special screws 1 1 The following applies to all reversing am plifiers The signal pressure of the positioner is sup plied at the output 1 o...

Страница 19: ...et 1 3 Special nuts 1 4 Rubber seal 1 5 Stopper 1 3 1 2 1 1 1 Output 38 Supply 9 A1 1 5 1 6 Z A2 1 4 A1 A2 Output 38 Supply 9 1 3 1 2 1 1 1 6 Z A1 From the limit switch To the actuator Vent plug or filter check valve Fig 7 Mounting a reversing amplifier item number 1079 1118 or 1079 1119 ...

Страница 20: ...Table 2 Mounting kits for direct attachment for version with solenoid valve Switchover connecting plate Actuator Order no Switchover plate for 120 cm actuator Type 3277 5xxxxxx 00 Actuator old 1400 6819 New switchover plate Actuator with index 01 and higher new 1400 6822 Connecting plate for additional attachment of e g a solenoid valve 3277 5xxxxxxxx 00 old G 1 8 1400 6820 1 8 NPT 1400 6821 New c...

Страница 21: ... 3 8 1402 0971 NPT 3 8 NPT 1402 0978 240 cm Steel G G 3 8 1400 6444 NPT 3 8 NPT 1402 0911 Stainless steel G G 3 8 1400 6445 NPT 3 8 NPT 1402 0912 350 cm Steel G G 3 8 1400 6446 NPT 3 8 NPT 1402 0913 Stainless steel G G 3 8 1400 6447 NPT 3 8 NPT 1402 0914 355 cm Steel G G 3 8 1402 0972 NPT 3 8 NPT 1402 0979 Stainless steel G G 3 8 1402 0973 NPT 3 8 NPT 1402 0980 700 cm Steel G G 3 8 1400 6448 NPT 3...

Страница 22: ...otection 1991 2110 Table 5 Attachment according to IEC 60534 6 Fig 4 Mounting kit Valve Travel mm With lever Order no NAMUR mounting kit see Fig 4 for parts Valve with cast yoke 7 5 to 60 N1 125 mm 1400 6787 22 5 to 120 N2 212 mm 1400 6789 Rod diameter mm of rod type yoke 20 to 25 N1 1400 6436 20 to 25 N2 1400 6437 25 to 30 N1 1400 6438 25 to 30 N2 1400 6439 30 to 35 N1 1400 6440 30 to 35 N2 1400 ...

Страница 23: ...s for rotary actuators Fig 5 Mounting parts Order no Actuator according to VDI VDE 3845 1 1400 8815 SAMSON Type 3278 Actuator 160 cm 1400 7103 320 cm 1400 7104 Attachment Masoneilan Camflex I DN 25 to 100 1400 7118 Camflex I DN 125 to 250 1400 7119 Camflex II 1400 7120 Cam disk with accessories Cam disk linear characteristic 0050 0072 0 to 90 opening angle 1400 6664 Cam disk for Masoneilan Camflex...

Страница 24: ...ssible values specified in the EC type examination certificates apply when interconnecting intrinsically safe electrical equipment 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 intrinsically safe circuits Clause 12 2 2 7 applies when running multi core cables and wires with mo...

Страница 25: ...itched while energized only during installa tion 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...

Страница 26: ...on in hazardous areas A B 41 42 51 52 81 82 _ Solenoid valve option Switching amplifier acc to EN 60947 5 6 Fig 8 Electrical connections Accessories Device index 3768 x x 03 and lower Cable gland PG 13 5 Black Order no 1400 6781 Blue Order no 1400 6782 Adapter PG 13 5 to NPT Metal to metal Order no 1400 7109 Painted blue Order no 1400 7110 Device index 3768 x x 04 and higher Cable gland M20x1 5 Bl...

Страница 27: ...ssure connection is fixed For attachment according to NAMUR the signal pressure is routed either to the top or bottom diaphragm case of the actuator de pending on the fail safe action i e actuator stem retracts or actuator stem extends Exhaust air Models with index 3768 x x 03 and higher are equipped with a hinged cover without a vent hole The exhaust air connections for these models are included ...

Страница 28: ...ions The switches A and B must be assigned to the end positions of the control valve valve OPEN or CLOSED depending on the mount ing position of the limit switch according to Table 8 and Table 9 The terminals 41 42 and 51 52 can optionally be assigned to the switches A and B by turning the associat ed label on the terminal block see Fig 8 Î Î The tags of the limit contacts cannot be turned by 360 ...

Страница 29: ...ype 3277 Actuator Fig 2 Left attachment Right attachment Switch Valve position Tag outside inductive field Tag inside inductive field Tag outside inductive field Tag inside inductive field Closed B A A B Open A B B A Table 9 NAMUR attachment Fig 4 Mounting position of the adapter housing when looking onto the lever 18 Left attachment Right attachment Cable gland points toward Valve position Switch...

Страница 30: ... explosion protected components on 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 viced devices Before being operated inside hazardous areas test the devices according to the specifications for servicing explo sion...

Страница 31: ...EB 8356 EN 31 Dimensions in mm 8 Dimensions in mm N1 113 N2 200 68 50 36 N1 N2 58 56 28 14 Output 38 Supply 9 29 150 164 76 19 5 37 68 185 M20 x 1 5 ...

Страница 32: ...32 EB 8356 EN Dimensions in mm 15 52 90 164 50 164 With reversing amplifier 1079 1118 1079 1119 Type 3710 ...

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Страница 48: ...SAMSON AG MESS UND REGELTECHNIK Weismüllerstraße 3 60314 Frankfurt am Main Germany Phone 49 69 4009 0 Fax 49 69 4009 1507 samson samson de www samson de EB 8356 EN 2017 05 03 English ...

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