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