Samson 3768 Mounting And Operating Instructions
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Samson 3768 Mounting And Operating Instructions

Samson 3768 Mounting And Operating Instructions

Inductive limit switch
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Type 3768 Inductive Limit Switch
Mounting and
Operating Instructions
EB 8356 EN
Edition February 2013

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Summary of Contents for Samson 3768

  • Page 1 Type 3768 Inductive Limit Switch Mounting and Operating Instructions EB 8356 EN Edition February 2013...
  • Page 2 These 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.

  • Page 3: Table Of Contents

    Contents General safety instructions ................5 Design and principle of operation ..............6 Technical data ....................7 Versions and article code ................8 Summary of explosion protection approvals .............9 Attachment to the valve ................10 Direct attachment ..................10 3.1.1 Attachment of version with solenoid valve ............10 Attachment according to IEC 60534-6 ............12 3.2.1 Mounting sequence ..................12...

  • Page 5: General Safety Instructions

    General safety instructions 1 General safety instructions For 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.

  • Page 6: Design And Principle Of Operation

    (5). ation The operation of the inductive limit switches The Type 3768 Limit Switch is designed for requires switching amplifiers to be connected attachment to pneumatic control valves. It is in the output circuit (see section 4).

  • Page 7: Technical Data

    Design and principle of operation 2.1 Technical data Travel range Direct attachment to Type 3277 Actuator: 7.5 to 30 mm Attachment according to IEC 60534 (NAMUR): 7.5 to 120 mm Inductive proximity switches 2x SJ2-SN Control circuit Specifications corresponding to connected switching amplifier Hysteresis at rated travel ≤ 1 % Permissible ambient temperature –20 to +80 °C with plastic cable gland...

  • Page 8: Versions And Article Code

    Design and principle of operation 2.2 Versions and article code Limit switch Type 3768- x Explosion protection Without II 2G Ex ia IIC T6 acc. to ATEX CSA/FM intrinsically safe/non incendive II 3G Ex nA II T6 acc. to ATEX Solenoid valve Without 6 V DC...

  • Page 9: Summary Of Explosion Protection Approvals

    Certification Type of protection Number GYJ15.1218X Date 2015-06-16 Ex ia IIC T4...T6 Gb Valid until 2020-06-15 3768-1 PTB 02 ATEX 2077 Date 2002-07-19 II 2G Ex ia IIC T6 EC type examination certificate Number 1607265 Ex ia IIC T6; Class I Zone 0;...

  • Page 10: Attachment To The Valve

    6. Mount the vent plug suitable for the cor- responding degree of protection on the The limit switch can be mounted either di- cover (18). rectly to SAMSON Type 3277 Actuator or to valves with cast yokes or rod-type yokes ac- 3.1.1 Attachment of version cording to IEC 60534-6 (NAMUR).
  • Page 11 Attachment to the valve Type 3277 Connection block only for version with solenoid valve View onto the signal pressure connection < Left attachment Right attachment > Actuator stem < extends retracts > Side view of Signal pressure connection connection block < internal over pipe connection >...

  • Page 12: Attachment According To Iec 60534-6

    Attachment to the valve Actuator with 120 cm² diaphragm area The signal pressure is transmitted to the dia- phragm chamber over the switchover plate. 1. Remove the M3 screw plug at the back of the limit switch and use the blanking plug from the accessories to seal the sig- nal pressure output (Output 38) at the side.
  • Page 13 Attachment to the valve Mounting position Attachment to NAMUR rib 24 25 21 20 Lever N1, N2 Plate Attachment to rods Clip Clamping plate Screw Pointer Shaft Lever of positioner 27a Coupling pin 27b Lock nut Bracket Studs Plate Nuts Mounting bracket Fig.

  • Page 14: Initial Adjustment Of Travel

    5. Place the limit switch on the adapter housing, taking into account the mount- SAMSON Type 3278 Actuator ing direction. Fasten it, making sure that 1. Fasten the adapter (36) to the free shaft end of the rotary actuator.
  • Page 15 Attachment to the valve Attachment to SAMSON Type 3278 Attachment according to VDI/VDE 3845 Vent plug or filter check valve 33 Limit switch 40 Cam disk 34 Intermediate piece 41 Actuator shaft 35 Lever with feeler roll 42 Washer 36 Adapter 43 Mounting bracket...

  • Page 16: Aligning The Cam Disk

    Attachment to the valve 3.3.3 Aligning the cam disk 2. Fasten the intermediate piece (34) to the actuator housing using two screws. Î Refer to Fig. 6 For the version with solenoid valve, align the intermediate piece so that the air The following applies on aligning the cam connections of the limit switch point to- disk:...
  • Page 17 Attachment to the valve Feeler roll Starting point Starting point 0˚ 0˚ Insert clip and press the flaps outwards Valve opens in counterclockwise direction Valve closes in clockwise direction Fig. 6: Aligning the cam disk EB 8356 EN...

  • Page 18: Reversing Amplifier For Double-Acting Actuators

    (Z) when added to versing amplifier. the pressure at output 1, is applied at output SAMSON Type 3710 Reversing Amplifier The following relationship applies: We recommend using a Type 3710 Revers- ing Amplifier. Refer to the mounting and op- Output 1 + Output 2 = Supply pressure (Z).
  • Page 19 Attachment to the valve From the limit switch Output 38 Supply 9 To the actuator Vent plug or filter check valve Reversing amplifier 1.1 Special screws 1.2 Gasket 1.3 Special nuts 1.4 Rubber seal 1.5 Stopper 1.3 1.2 Fig. 7: Mounting a reversing amplifier (item number 1079-1118 or 1079-1119) EB 8356 EN...
  • Page 20 Attachment to the valve Table 1: Mounting kits for direct attachment (see Fig. 2 on page 11) Actuator size Lever with associated clamp and intermediate plate Order no. Standard version 1400-7116 120 cm² D1 lever with stopper for output (38) Version compatible with paint 1402-0944 Standard version 1400-6370...
  • Page 21 Attachment to the valve Table 3: Pipe connection for direct attachment onto Type 3277 for version with solenoid valve Pipe connection Actuator size Material Connection Order no. G ¼ / G  1402-0970 Steel ¼ NPT/  NPT 1402-0976 175 cm² G ¼ / G  1402-0971 Stainless steel ¼ NPT/  NPT 1402-0978...
  • Page 22 Attachment to the valve Table 4: Further accessories for direct attachment Accessories Order no. Stainless steel/brass 1400-6950 Pressure gauge mounting kit for supply air and signal pressure Stainless steel/stainless steel 1400-6951 Filter check valve, replaces vent plug on the device Polyamide, IP 65 degree of 1790-7408 protection 1.4301, IP 65 degree of...
  • Page 23 Table 7: Mounting parts for rotary actuators (Fig. 5) Mounting parts Order no. Actuator according to VDI/VDE 3845 1400-8815  1) 160 cm² 1400-7103 SAMSON Type 3278 Actuator 320 cm² 1400-7104 Camflex I, DN 25 to 100 1400-7118 Attachment Masoneilan Camflex I, DN 125 to 250 1400-7119 Camflex II...

  • Page 24: Electrical Connections

    Electrical connections 4 Electrical connections Note on the selection of cables and  wires: DANGER! Observe clause 12 of EN 60079-14: Risk of electric shock. 2008 (VDE 0165, Part 1) for For electrical installation, observe the installation of the intrinsically safe relevant electrotechnical regulations circuits.
  • Page 25 Electrical 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- limited circuits with type of protection Ex nL (energy-limited equipment)
  • Page 26 Electrical connections Terminal assignment Accessories: Device index 3768 x...x.03 and lower Î Refer to terminal assignment Fig. 8 or to Cable gland PG 13.5: the label on the terminal block. Black Order no. 1400-6781 Switching amplifier Blue Order no. 1400-6782 The operation of the inductive limit contacts Adapter PG 13.5 to ½ NPT:...

  • Page 27: Pneumatic Connections For Version With Solenoid Valve

    "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 in the accessories in this case.

  • Page 28: Operation - Adjusting The Limit Contacts

    Operation – Adjusting the limit contacts 5 Operation – Adjusting the Table 8 and Table 9. The terminals 41/42 and 51/52 can optionally be assigned to limit contacts the switches A and B by turning the associat- Two adjustable tags (51) are located on the ed label on the terminal block (see Fig.
  • Page 29 Operation – Adjusting the limit contacts Adjusting the switching point: Î Move the valve to the switching point and adjust the corresponding tag by turning the adjustment screw (53) so that the switching point is reached and indi- cated by the LED on the switching ampli- fier.

  • Page 30: Servicing Explosion-Protected Devices

    Servicing explosion-protected devices 6 Servicing explosion-protected 7 Maintenance and calibration devices Interconnection with intrinsically safe circuits to check or calibrate the equipment inside or If a part of the device on which the explosion outside hazardous areas is to be performed protection is based needs to be serviced, the only with intrinsically safe current/voltage device must not be put back into operation...

  • Page 31: Dimensions In Mm

    Dimensions in mm 8 Dimensions in mm M20 x 1.5 19.5 Output (38) Supply (9) N1=113 N2=200 EB 8356 EN...
  • Page 32 Dimensions in mm With reversing amplifier 1079-1118/ 1079-1119 Type 3710 EB 8356 EN...
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  • Page 48 SAMSON AG · MESS- UND REGELTECHNIK Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 EB 8356 EN samson@samson.de · www.samson.de...

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