Samson 4746 Service manual

Translation of original instructions
EB 8365 EN
Edition September 2020
Type4746 Electric or Pneumatic Limit Switch

Note on these mounting and operating instructions
These mounting and operating instructions assist you in mounting and operating the device
safely. The instructions are binding for handling SAMSON devices. The images shown in
these instructions are for illustration purposes only. The actual product may vary.
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 ([e-mail]).
Documents relating to the device, such as the mounting and operating in-
structions, are available on our website at www.samsongroup.com >
Service & Support > Downloads > Documentation.
Definition of signal words
Hazardous situations which, if not avoided,
will result in death or serious injury
Hazardous situations which, if not avoided,
could result in death or serious injury
Property damage message or malfunction
Additional information
Recommended action
DANGER
!
WARNING
!
NOTICE
!
Note
Tip
EB 8365 EN

Contents
EB 8365 EN
1 Safety instructions and measures ................................................................1-1
1.1 Notes on possible severe personal injury ......................................................1-4
1.2 Notes on possible personal injury ................................................................1-4
1.3 Warnings on the device...............................................................................1-5
2 Markings on the device ..............................................................................2-1
2.1 Nameplate .................................................................................................2-1
2.2 Article code................................................................................................2-2
3 Design and principle of operation ...............................................................3-1
3.1 Type4746-x2InductiveLimitSwitch .............................................................3-1
3.2 Type4746-x3ElectricLimitSwitch................................................................3-1
3.3 Type4746-04PneumaticLimitSwitch...........................................................3-1
3.4 Technical data ............................................................................................3-3
3.5 Dimensions in mm.......................................................................................3-7
4 Shipment and on-site transport ...................................................................4-1
4.1 Accepting the delivered goods .....................................................................4-1
4.2 Removing the packaging from the limit switch ...............................................4-1
4.3 Transporting the limit switch.........................................................................4-1
4.4 Storing the limit switch.................................................................................4-1
5 Installation.................................................................................................5-1
5.1 Installation conditions..................................................................................5-1
5.2 Preparationforinstallation...........................................................................5-1
5.3 Mounting the limit switch .............................................................................5-2
5.3.1 Attachment to valve with cast yoke ...............................................................5-2
5.3.2 Attachment to valve with rod-type yoke.........................................................5-2
5.3.3 AttachmenttoType3591Valve....................................................................5-4
5.3.4 Attachment on positioners............................................................................5-6
5.4 Electrical connections ..................................................................................5-7
5.4.1 SwitchingamplierforType4746-x2...........................................................5-8
5.5 PneumaticconnectionforType4746-04 .......................................................5-8
5.6 Mountingaccessories ................................................................................5-10
6 Start-up .....................................................................................................6-1
6.1 Adjustingtheswitchingpoint .......................................................................6-1
6.1.1 Type4746-x2.............................................................................................6-1
6.1.2 Type4746-x3andType4746-04 ................................................................6-3

Contents
EB 8365 EN
7 Operation..................................................................................................7-1
8 Malfunction................................................................................................8-1
8.1 Emergency action .......................................................................................8-1
9 Servicing....................................................................................................9-1
9.1 Servicingexplosion-protecteddevices...........................................................9-2
9.2 Maintenanceandcalibration .......................................................................9-2
9.3 Periodicinspectionandtestingofthelimitswitch ...........................................9-2
10 Decommissioning .....................................................................................10-1
11 Removal ..................................................................................................11-1
12 Repairs ....................................................................................................12-1
12.1 Returning devices to SAMSON ..................................................................12-1
13 Disposal...................................................................................................13-1
14 Certicates...............................................................................................14-1
14.1 Certicates ...............................................................................................14-1
15 Annex......................................................................................................15-1
15.1 After-sales service.....................................................................................15-1

EB 8365 EN 1-1
Safety instructions and measures
1 Safety instructions and measures
Intended use
TheSAMSONType4746LimitSwitchissuesanelectricsignalwhenthevalvetravelexceeds
or falls below an adjusted limit. The signal is suitable for switching control signals, issuing
visual and audible alarms or for connection to central control or alarm systems. The device is
designedtooperateunderexactlydenedconditions(e.g.temperature).Therefore,operators
must ensure that the limit switch is only used in applications where the operating conditions
correspond to the technical data. In case operators intend to use the limit switch in other
applicationsorconditionsthanspecied,contactSAMSON.
SAMSON does not assume any liability for damage resulting from the failure to use the
deviceforitsintendedpurposeorfordamagecausedbyexternalforcesoranyother
externalfactors.
ÎRefertothetechnicaldataforlimitsandeldsofapplicationaswellaspossibleuses.
Reasonably foreseeable misuse
TheType4746LimitSwitchisnot suitable for the following applications:
−Useoutsidethelimitsdenedduringcongurationandbythetechnicaldata
Furthermore, the following activities do not comply with the intended use:
−Use of non-original spare parts
−Performingmaintenanceactivitiesnotdescribedintheseinstructions
Qualications of operating personnel
Thelimitswitchmustbemounted,startedupandservicedbyfullytrainedandqualied
personnel only; the accepted industry codes and practices must be observed. According to
these mounting and operating instructions, trained personnel refers to individuals who are
able to judge the work they are assigned to and recognize possible hazards due to their
specializedtraining,theirknowledgeandexperienceaswellastheirknowledgeofthe
applicable standards.
Explosion-protectedversionsofthisdevicemustbeoperatedonlybypersonnelwhohasun-
dergonespecialtrainingorinstructionsorwhoisauthorizedtoworkonexplosion-protected
devices in hazardous areas.

1-2 EB 8365 EN
Safety instructions and measures
Personal protective equipment
No personal protective equipment is required for the direct handling of the limit switch. Work
on the control valve may be necessary when mounting or removing the device.
ÎObservetherequirementsforpersonalprotectiveequipmentspeciedinthevalvedocu-
mentation.
ÎCheck with the plant operator for details on further protective equipment.
Revisions and other modications
Revisions,conversionsorothermodicationsoftheproductarenotauthorizedbySAMSON.
Theyareperformedattheuser'sownriskandmayleadtosafetyhazards,forexample.Fur-
thermore, the product may no longer meet the requirements for its intended use.
Warning against residual hazards
To avoid personal injury or property damage, plant operators and operating personnel must
prevent hazards that could be caused in the control valve by the process medium, the operat-
ingpressure,thesignalpressureorbymovingpartsbytakingappropriateprecautions.Plant
operators and operating personnel must observe all hazard statements, warning and caution
notes in these mounting and operating instructions, especially for installation, start-up and
service work.
Responsibilities of the operator
Operators are responsible for proper use and compliance with the safety regulations. Opera-
tors are obliged to provide these mounting and operating instructions to the operating per-
sonnel and to instruct them in proper operation. Furthermore, operators must ensure that op-
eratingpersonnelorthirdpartiesarenotexposedtoanydanger.
Responsibilities of operating personnel
Operating personnel must read and understand these mounting and operating instructions as
wellasthespeciedhazardstatements,warningandcautionnotes.Furthermore,theoperat-
ing personnel must be familiar with the applicable health, safety and accident prevention
regulations and comply with them.

EB 8365 EN 1-3
Safety instructions and measures
Referenced standards and regulations
DeviceswithaCEmarkingfulllthefollowingrequirements:
−Type4746: 2011/65/EU,2015/863/EU
−Type4746-0: 2011/65/EU,2014/30/EU
−Type4746-12: 2011/65/EU,2014/30/EU,2014/34/EU
−Type4746-13: 2011/65/EU,2014/30/EU,2014/34/EU
−Type4746-82: 2011/65/EU,2014/30/EU,2014/34/EU
−Type4746-83: 2011/65/EU,2014/30/EU,2014/34/EU
The declarations of conformity are included at the back of these mounting and operating
instructions.
DeviceswithanEACmarkingfulllthefollowingrequirements:
−Type4746: TR CU 020/2011
−Type4746-1: TR CU 012/2011; applicable GOST standards:
–ГОСТ31610.0-2014(IEC60079-0:2011
–ГОСТ31610.11-2014(IEC60079-11:2011)
TheEACcerticatesareincludedatthebackofthesemountingandoperatinginstructions.
Referenced documentation
The following documents apply in addition to these mounting and operating instructions:
−The mounting and operating instructions of the components on which the limit switch is
mounted (valve, actuator, valve accessories etc.).

1-4 EB 8365 EN
Safety instructions and measures
1.1 Notes on possible severe personal injury
DANGER
!
Risk of fatal injury due to the ignition of an explosive atmosphere.
Incorrectinstallation,operationormaintenanceofthelimitswitchinpotentiallyexplo-
sive atmospheres may lead to ignition of the atmosphere and ultimately to death.
ÎFormountingandelectricalinstallationinhazardousareas,observetheexplosion
protection approvals as well as the relevant electrotechnical regulations and the ac-
cidentpreventionregulationsthatapplyinthecountryofuse.EN60079-14applies
in Europe: Electrical installations design, selection and erection
ÎInstallation, operation or maintenance of the limit switch must only be performed by
personnel who has undergone special training or instructions or who is authorized
toworkonexplosion-protecteddevicesinhazardousareas.
1.2 Notes on possible personal injury
WARNING
!
Incorrect electrical connection will render the explosion protection unsafe.
ÎAdhere to the terminal assignment and observe correct polarity.
ÎDo not undo the enameled screws.
ÎDonotexceedthemaximumpermissiblevalues(Ui, li,Pi, Ci,Li)speciedintheEC
typeexaminationcerticateswheninterconnectingintrinsicallysafeelectricalequip-
ment.
Sudden loud noise when the limit contact switches.
The pneumatic limit switch may create a loud noise when the limit contact switches. This
can cause hearing damage.
ÎWear hearing protection when working near the valve.

EB 8365 EN 1-5
Safety instructions and measures
Risk of personal injury through incorrect operation, use or installation as a result of
information on the limit switch being illegible.
Over time, markings, labels and nameplates on the limit switch may become covered
with dirt or become illegible in some other way. As a result, hazards may go unnoticed
and the necessary instructions not followed. There is a risk of personal injury.
ÎKeep all relevant markings and inscriptions on the device in a constantly legible state.
ÎContact SAMSON when nameplates or labels are damaged, missing or incorrect to
renew them.
1.3 Warnings on the device
Warning Meaning of the warning
Warning against sudden loud noise
A loud noise may occur when the pneumatic limit contact switches. This can
cause hearing damage.

1-6 EB 8365 EN

EB 8365 EN 2-1
Markings on the device
2 Markings on the device
2.1 Nameplate
Examples
Limit switch electric
Made in Germany
SAMSON AG D-60314 Frankfurt
Model
* See technical data and explosion-protection
certificate for permissible ambient temperature
and maximum values for connection to
certified intrinsically safe circuits.
Serial no.
Var.-ID
0044
4746
1
2
3
4 5
6
Explosion-protected version with electric
limit contacts
Explosion-protected version with
inductive limit contacts
Made in Germany
SAMSON AG D-60314 Frankfurt
Model
Serial no.
Var.-ID
0044
4746
Limit switch inductive
* See technical data and explosion-protection
certificate for permissible ambient temperature
and maximum values for connection to
certified intrinsically safe circuits.
1
2
3
4 5
6
1 Degree of protection
2Maximumvaluesofelectricdata
UiInput voltage
IiInput current
PiInput power
CiInner capacitance
LiInner inductance
3 Model number
4CongurationID
5 Serial number
6 DataMatrixcode(ifapplicable)

2-2 EB 8365 EN
Markings on the device
2.2 Article code
Limit switch (deviceindex .07 or higher) Type4746- x x x x x x x 0xxxx
Explosionprotection
Without 0
ATEX II2GExiaIICT6Gb 1
CSA ExiaIICT6:ClassI,Zone0;
Class I, II, Div. 1, Groups A, B, C, D, E, F, G;
Class I, II, Div. 2, Groups A, B, C, D, E, F, G;
3
FM 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;
ATEX II3GExnAIIT6Gc 8
Design
Inductive 2
1/2
Electric 3 2
Pneumatic 0 4 2
Contacts
ProximityswitchSC3,5-N0-YE(NAMURNCcontact)1) 2 0 0 1 0
ProximityswitchSC3,5-N0-WH(NAMURNCcontact),
larger hysteresis 201 10
ProximityswitchSJ3,5-SN(NAMURNCcontactinsafetycircuit) 210 10
ProximityswitchSJ3,5-S1N(NAMURNOcontactinsafetycircuit) 211 10
SAIA, electric microswitch XGK 3 (silver contacts) 320210
SAIA, electric microswitch XGK3-81 (gold-plated contacts) 321210
Pneumaticmicroswitch 044020
ProximityswitchSB3,5-E2(three-wireswitch,NOcontact) 0281210
Switching elements
With one switching element 1
With two switching elements 2
Electrical connection
Without 0440 0
PlasticcableglandM20x1.5,black 1 0
Pneumaticconnections
Without 0
ISO221/1-G
1
/
8
0440 01
1
/
8
-27NPT 0440 02

EB 8365 EN 2-3
Markings on the device
Limit switch (deviceindex .07 or higher) Type4746- x x x x x x x 0xxxx
Special versions
Without 000
NEPSI ExiaIICT4~T6Gb(onrequest) 122 009
NEPSI ExicIICT4~T6Gc
ExnAIICT4~T6Gc(onrequest) 822 010
EAC 1ExiaIICT6...T4GbX 1
2/3 013
Compatibility with paint
Without 0
Free of substances that impair paint adhesion 1
Limit switch(deviceindex.06 or lower)Type4746- x x x x
Design
Inductive,without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2) 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1)(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
1) Type4746-3200/3201onlywithFMcertication
2) SJ3,5-NreplacedbySC3,5-N0-YEandSC3,5-N0-WHsince2007

2-4 EB 8365 EN
When replacing devices with index .00 to .03, a mounting kit with lever must also be
ordered (see the 'Installation' section).
Note

EB 8365 EN 3-1
Design and principle of operation
3 Design and principle of oper-
ation
The limit switches are attached to pneumatic
controlvalvesaswellastoType4765and
Type4763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signalis
transmitted, e.g. to an alarm or indicating
system.
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).
3.1 Type4746-x2 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
integratedproximityswitches(5).Forthe
operationofinductivelimitcontacts(except
forType4746-0281),appropriateswitch
ampliersmustbeintegratedintotheoutput
circuit.
The switching function and switching point
are continuously adjustable using the adjust-
ment screw (3.1).
3.2 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).
3.3 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
nozzle in the pneumatic switch (8) is opened
and the supply air is switched from the
microswitch(9)throughtoportA1or A2.
The nozzle is closed in the pneumatic switch
(8) and the supply air applied to the micros-
witch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).

3-2 EB 8365 EN
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 contact
Electric limit switch
Pneumaticlimitswitchwithswitchingfunction
1Leverforvalvetravel
1.1 Coupling pin
2 Shaft
3 Switch case
3.1 Adjustment screw
4.1 Metal tag
4.2 Cam disk
5Proximityswitch
6Switch lever
6.1 Roller
6.2 Spring
7Electric switch
8Pneumaticlimitswitch
8.1 Nozzle (in switch)
8.2 Flapper plate
9 Pneumaticmicroswitch
10 Plateattachedeitherto
actuator stem or plug stem
Fig.3-1: Functional drawings

EB 8365 EN 3-3
Design and principle of operation
3.4 Technical data
Table 3-1: General data
Inductive Limit Switch Type4746-x2 Type4746-0281
Control circuit
SwitchingamplieraccordingtoEN60947-5-6
Three-wire switch,
operating voltage
10to30V
Proximityswitch SC3,5-N0-YE2)
SC3,5-N0-WH 2) SJ3,5-SN SJ3,5-S1N SB3,5-E2
Permissibleambienttemperature1) –20to+100°C –20to+100°C –20to+100°C –20to+70°C
With metal cable gland –40to+100°C –50to+100°C –40to+100°C –25to+70°C
Switching function NC contact NC contact Closing valve Closing valve
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-sections
Degree of protection IP65
Weight Approx.0.7kg
Type4746-x3 Electric Limit Switch · Specications apply to silver and gold-plated contacts
Switching element Electriclimitswitch:changeovercontact/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-sections
Degree of protection IP65
Weight Approx.0.7kg
Type4746-04 Pneumatic Limit Switch
Switching element
Pneumaticlimitcontactwithdownstreampneumaticmicroswitch
Supply air Supplyair1.4bar(20psi),canbebriey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

3-4 EB 8365 EN
Design and principle of operation
Materials
Enclosure and cover Powder-coatedaluminum
Leverandshaft 1.4571
Cable gland M20x1.5,blackpolyamide
Attachment Travel range
AccordingtoIEC60534-6 LeverI:7.5to60mm·LeverII:60to180mm
AttachmenttoType4763/4765
Positioner Travel same as positioner
Conformity ·
1) ObservethelimitsspeciedintheEC-typeexaminationcerticate.
2) SJ3,5-NreplacedbySC3,5-N0-YEandSC3,5-N0-WHsince2007
Table 3-2: Hysteresis (dead band)
Type4746 -x2 -x3 -04
LeverlengthL Hysteresis
50mm 0.15 (0.251))mm 0.6mm 0.75mm
120mm 0.30 (0.551))mm 1.0mm 1.5mm
1) Special version
Table 3-3: Type4746-1 with type of protection Ex ia (ATEX)
Maximumvaluesforconnectiontocertiedintrinsicallysafecircuits
Limit Switch Type4746-12 Type4746-13
Inductive Electric
Limitcontacts
SC3,5–N0-YE
4746-1200
SJ3,5-N
4746-1200
(old)
SC3,5-N0-WH
4746-1201
SJ3,5-SN
4746-1210
SJ3,5-S1N
4746-1211
Microswitch
SPDT
UiV 16 16 16 16 45
IimA 25 52 25 52 25 52 25 52 –
PimW 64 169 64 169 64 169 64 169 2000
Ci1) nF 150 50 150 30 Negligibly small
Li2) µH 150 250 150 100

EB 8365 EN 3-5
Design and principle of operation
Limit Switch Type4746-12 Type4746-13
Inductive Electric
Limitcontacts
SC3,5–N0-YE
4746-1200
SJ3,5-N
4746-1200
(old)
SC3,5-N0-WH
4746-1201
SJ3,5-SN
4746-1210
SJ3,5-S1N
4746-1211
Microswitch
SPDT
Temperature class-
es
AmbienttemperaturerangeaccordingtoEC-typeexaminationcerticate(technicaldataspeci-
edinabovetableadditionallyapply)
T4 °C ≤100 ≤75 ≤100 ≤89 ≤100 ≤89 ≤100 ≤89 –45 to +80
T5 °C ≤80 ≤55 ≤81 ≤60 ≤81 ≤60 ≤81 ≤60 –45to+70
T6 °C ≤65 ≤40 ≤66 ≤45 ≤66 ≤45 ≤66 ≤45 –45to+60
1) Effective inner capacitance
2) Effective inner inductance
Table 3-4: Summary of explosion protection approvals
Type Certication Type of protection
4746 STCC
Number ZETC/24/2018
II2GExiaIICT6
II3GExnAIIT6
Date 2018-04-27
Validuntil 2021-04-26
4746-1
Number RU C-DE.
HA65.B.00615/20
1ExiaIICT6...T4GbX
Date 2020-06-08
Validuntil 2025-05-13
KCS
Number 13-KB4BO-0038
ExiaIICT6/T5/T4Date 2013-01-31
Validuntil 2021-01-31
4746-12
NEPSI On request ExiaIICT4~T6Gb
CCoE
Number A/P/HQ/
MH/104/1793
EExiaIICT6
Date 2016-11-12
Validuntil 2021-11-11
4746-1x
Number PTB98ATEX2114
II2GExiaIICT6Gb
Date 2020-02-04
ECtypeexamination
certicate

3-6 EB 8365 EN
Design and principle of operation
Type Certication Type of protection
4746-3 CSA
Number 1607226 ExiaIICT6:ClassI,Zone0;
Class I, II, Div. 1, Groups A, B, C, D, E, F,
G;
Class I, II, Div. 2, Groups A, B, C, D, E, F,
G;
Date 2005-09-16
4746-32
4746-33 FM
Number 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 2015-10-12
4746-82
4746-83
NEPSI On request ExicIICT4~T6Gc
ExnAIICT4~T6Gc
Number PTB02ATEX2012X
II3GExnAIIT6Gc
Date 2002-04-05
Statement of
conformity