Samson 4746 Service-Handbuch
Mounting and
Operating Instructions
EB 8365 EN
Edition October 2013
Type 4746
Electric or Pneumatic Limit Switch
Denition 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
NOTICE
Property damage message or mal-
function
Note:
Additional information
Tip:
Recommended action
2 EB 8365 EN
Note on these mounting and operating instructions
These mounting and operating instructions (EB) assist you in mounting and operating the de-
vice safely. The instructions are binding for handling SAMSON devices.
ÎFor the safe and proper use of these instructions, read them carefully and keep them for
later reference.
ÎIf you have any questions about these instructions, contact SAMSON's After-sales Service
department (aftersalesser[email protected]).
The mounting and operating instructions for the devices are included in
the scope of delivery. The latest documentation is available on our website
(www.samson.de) > Product documentation. You can enter the document
number or type number in the [Find:] eld to look for a document.
Referenced documentation
The documents for the devices used in combination with the limit switch apply in addition to
these mounting and operating instructions.
Contents
EB 8365 EN 3
1 General safety instructions.............................................................................5
2 Design and principle of operation ..................................................................6
2.1 Principle of operation.....................................................................................6
2.1.1 Type 4746-x Inductive Limit Switch..................................................................6
2.1.2 Type 4746-x3 Electric Limit Switch...................................................................6
2.1.3 Type 4746-04 Pneumatic Limit Switch..............................................................6
2.2 Article code and versions ...............................................................................8
2.3 Technical data .............................................................................................10
2.4 Accessories .................................................................................................12
2.5 Summary of explosion protection approvals...................................................12
3 Attachment to the valve ...............................................................................14
3.1 Attachment to valve with cast yoke ................................................................14
3.2 Attachment to valve with rod-type yoke..........................................................14
3.3 Attachment to Type3591 Valve.....................................................................16
3.4 Attachment to positioner...............................................................................18
4 Connections ................................................................................................19
4.1 Electrical connection.....................................................................................19
4.1.1 Switching amplier for Type 4746-x2............................................................21
4.2 Pneumatic connection for Type 4746-04........................................................21
5 Operation...................................................................................................22
5.1 Adjusting the switching point ........................................................................22
5.1.1 Type 4746-x2..............................................................................................22
5.1.2 Type 4746-x3 and Type4746-04 .................................................................23
6 Servicing explosion-protected devices ..........................................................24
7 Maintenance and calibration .......................................................................24
8 Dimensions .................................................................................................25
9 Certicates..................................................................................................26
EB 8365 EN 5
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.
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 fulll the requirements of the Directives 2014/34/EU
and 2014/30/EU.
The Declarations of Conformity are included in the Appendix of these instructions.
6 EB 8365 EN
Design and principle of operation
2 Design and principle of oper-
ation
The limit switches are attached to pneumatic
control valves as well as to Type4765 and
Type4763 Positioners.
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
valve has reached its nal position. This sig-
nal is transmitted, e.g. to an alarm or indi-
cating system.
2.1 Principle of operation
The 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
Type4746-0281), appropriate switch ampli-
ers must be integrated into the output cir-
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/
apper system in the pneumatic switch (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
and the supply air from the microswitch (9)
is switched through to port A1or A2.
The nozzle is closed in the pneumatic switch
(8) and the supply air applied to the micro-
switch is cut off rst when the cam disk has
released the switch lever (6). As a result,
pressure is no longer applied to port A1or
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
3.1
3
5
L
10
4.1 1 1.12
L
3.1
3
1076.26.16
4.2 1 1.12
L
3.1
3
4.2 1 1.12
1086.26.16
A1A
2
99
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 travel
1.1 Pin
2 Shaft
3 Switch case
3.1 Adjustment screw
4.1 Metal tag
4.2 Cam disk
5 Proximity switch
6 Switch lever
6.1 Roller
6.2 Spring
7 Electric switch
8 Pneumatic switch
8.1 Nozzle (in switch)
8.2 Flapper (in switch)
9 Pneumatic microswitch
10 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 versions
Limit switch (device index .07 and higher) Type 4746- x x x x x x x 0 x x x x
Explosion protection
Without 0
Ex II 2G Ex ia IIC T6 acc. to ATEX 1
CSA/FM intrinsically safe/non incendive 3
Ex II 3G Ex nA II T6 acc. to ATEX 8
Type
Inductive 2 1/2
Electric 3 2
Pneumatic 0 4 2
Contacts
Proximity switch SC3,5-N0-YE 1) 2 0 0 1 0
Proximity switch SJ3,5-SN 2 1 0 1 0
Proximity switch SJ3,5-S1N 2 1 1 1 0
SAIA, electric microswitch XGK 3 320210
SAIA, electric microswitch XGK3-81 321210
Pneumatic microswitch 0 4 4 0 2 0
Proximity switch SB3,5-E2 0281210
Switching elements
With one switching element 1
With two switching elements 2
Electrical connection
Without 0 4 4 0 0
Plastic cable gland M20 x 1.5, black 1 0
Pneumatic connections
Without 0
ISO 221/1-G
1
/
8
0 4 4 0 0 1
1
/
8
-27 NPT 0 4 4 0 0 2
Special versions
Without 000
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
KOSHA approval Ex ia 1 2/3 0 1 5
1) Type4746-3200 only with FM approval
EB 8365 EN 9
Design and principle of operation
Compatibility with paint
Without 0
Free 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 for positioner attachment
2
½” USA cable gland, lever I
3
½” USA cable gland, lever 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
19
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 data
Inductive Limit Switch Type 4746-x2 Type 4746-0281
Control circuit Switching amplier according to EN 60947-5-6 Three-wire switch
Operating voltage 10 to 30 V
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 range
Screw 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 · Specications 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 A
DC 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 connections One M20x1.5 cable gland for 5.5 to 13 mm clamping range
Screw 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 briey overloaded up to 4 bar (60 psi)
Air consumption 0.04 mn3/h
Output 0 or 1.4 bar (20 psi)
Air 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
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