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EB 8357 EN 

 7 

Design and principle of operation

Design and principle of oper-

ation

The Type 4740 Limit Switch can be mounted 
onto the following devices:

 

Type 3353 Angle Seat Valve (see Fig. 1)

 

Type 3354 Globe Valve

 

Type 3379 Pneumatic Actuator

The inductive proximity switches or micros

-

witches cause signals to be sent to a control 
or alarm system when the travel exceeds or 
falls below the adjusted limit. 
The limit switch can optionally be fitted with 
a 3/2-way solenoid valve. When the inte

-

grated solenoid valve is energized, supply 

air is applied to the actuator. When the so-

lenoid valve is de-energized, the actuator is 
vented and the control valve moves to its fail-

safe position.
The switching points of the limit contacts can 

be changed within the travel range after in

-

stallation. See section 5.1 on page 20.

3.1 

Versions

Two versions of the Type 4740 Limit Switch 
are available:

 

With inductive proximity switches

 

With microswitches

Fig. 1: 

Type 4740 Limit Switch with optional 

solenoid valve on a Type 3353 Angle 

Seat Valve

Содержание 4740

Страница 1: ...Mounting and Operating Instructions EB 8357 EN Edition January 2015 Type 4740 Electric Limit Switch...

Страница 2: ...h if not avoided will result in death or seri ous injury WARNING Hazardous situations which if not avoided could result in death or seri ous injury NOTICE Property damage message or mal function Note...

Страница 3: ...in mm 9 4 Mounting and start up 10 4 1 Mounting on Type 3353 and Type 3354 Valves 10 4 1 1 Preparing the mounting kit 10 4 1 2 Mounting on the control valve 12 4 2 Mounting on Type 3379 Pneumatic Actu...

Страница 4: ......

Страница 5: ...the applicable standards 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 inad...

Страница 6: ...o indicate inductive mechanical proximity switch 3 Article code 4 Configuration ID 5 Serial no 2 2 Article code Limit switch Type 4740 0 0 0 x x x x 0 0 x x Type Inductive proximity sensor NCB2 V3 NO...

Страница 7: ...it switch can optionally be fitted with a 3 2 way solenoid valve When the inte grated solenoid valve is energized supply air is applied to the actuator When the so lenoid valve is de energized the act...

Страница 8: ...er according to EN 60947 5 6 Version with microswitches Switching capacity 250 V AC 16 6 A Option 3 2 way solenoid valve Nominal voltage 24 V DC Power 1 5 W Flow rate 55 ln min KV 0 035 Maximum operat...

Страница 9: ...EB 8357 EN 9 Markings on the device 3 3 Dimensions in mm 121 94 22 M20 x 1 5...

Страница 10: ...ired to mount the limit switch onto a fail close FA NC valve Limit switch with inductive proximity switch es Thread the guided bushing 2 with the beveled part 2 1 facing downward on to the stem of the...

Страница 11: ...mit switch with inductive proximity switches Mounting kit for limit switch with microswitches 2 Threaded bushing 2 1 Beveled part 2 2 Straight rim 3 Adapter 3 1 Stem 3 2 Sleeve 4 Spacer 2 3 1 3 3 2 4...

Страница 12: ...or the version with microswitches make sure that the switches 1 5 in the limit switch do not get damaged 5 Lock the limit switch in the required posi tion using the retaining screw 1 4 Fail close FA N...

Страница 13: ...ounting and start up 1 2 3 5 1 4 1 Limit switch 1 4 Retaining screw 1 5 Switch 2 Threaded bushing 3 Adapter 5 Actuator 5 1 Transparent cover 5 2 Cap 5 1 5 2 5 1 5 Fig 3 Mounting the limit switch on th...

Страница 14: ...ue to sharp thread Do not touch the sharp thread of the adapter Limit switch with inductive proximity switch es Thread the guided bushing 2 with the beveled part 2 1 facing downward on to the stem of...

Страница 15: ...ng kit for limit switch with inductive proximity switches Mounting kit for limit switch with microswitches 2 Threaded bushing 2 1 Beveled part 2 2 Straight rim 3 Adapter 3 1 Stem 2 1 2 2 2 2 2 1 2 1 2...

Страница 16: ...ator 5 2 Pull the cap 5 2 off the actuator stem 3 Thread the ready assembled adapter see section 4 2 1 from the top into the actuator 5 4 Carefully place the limit switch 1 on the ready assembled adap...

Страница 17: ...nting and start up 5 1 5 2 5 1 5 1 Limit switch 1 4 Retaining screw 1 5 Switch 2 Threaded bushing 3 Adapter 5 Actuator 5 1 Transparent cover 5 2 Cap 1 2 3 5 1 4 Fig 5 Mounting the limit switch onto Ty...

Страница 18: ...lations and the accident prevention regulations of the employers liability insurance 1 Unscrew the four screws on housing cov er and take the cover off the actuator 2 Route wires through the cable gla...

Страница 19: ...ghly before connecting them Two pneumatic connections exist on the limit switch version with solenoid valve see Fig 7 The following assignment apply to the con nections Connection 1 Supply Connection...

Страница 20: ...1 3 can move on the rail 1 4 3 Adjust the switching point with the screw 1 2 Turn the screw clockwise to move the lim it contact towards the top end position Turn the screw counterclockwise to move t...

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Страница 24: ...SAMSON AG MESS UND REGELTECHNIK Weism llerstra e 3 60314 Frankfurt am Main Germany Phone 49 69 4009 0 Fax 49 69 4009 1507 samson samson de www samson de EB 8357 EN 2016 02 05 English...

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