Samson 4740 Manuel de service
Mounting and
Operating Instructions
EB 8357 EN
Edition January 2015
Type4740 Electric 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 seri-
ous injury
NOTICE
Property damage message or mal-
function
Note:
Additional information
Tip:
Recommended action
2 EB 8357 EN
Contents
EB 8357 EN 3
1 General safety instructions.............................................................................5
2 Markings on the device .................................................................................6
2.1 Nameplate ....................................................................................................6
2.2 Article code...................................................................................................6
3 Design and principle of operation ..................................................................7
3.1 Versions ........................................................................................................7
3.2 Technical data ...............................................................................................8
3.3 Dimensions in mm..........................................................................................9
4 Mounting and start-up.................................................................................10
4.1 MountingonType3353andType3354Valves..............................................10
4.1.1 Preparing the mounting kit............................................................................10
4.1.2 Mountingonthecontrolvalve .......................................................................12
4.2 MountingonType3379PneumaticActuator..................................................14
4.2.1 Preparing the mounting kit............................................................................14
4.2.2 Mounting on actuator...................................................................................16
4.3 Installation...................................................................................................18
4.3.1 Electrical connection.....................................................................................18
4.3.2 Pneumatic connection...................................................................................19
5 Start-up ......................................................................................................20
5.1 Adjustingthelimitcontacts ...........................................................................20
EB 8357 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 limit switch:
ÎThedeviceistobemounted,starteduporoperatedonlybytrainedandexperienced
personnel familiar with the product.
According to these mounting and operating instructions, trained personnel refers to indi-
vidualswhoareabletojudgetheworktheyareassignedtoandrecognizepossibledan-
gersduetotheirspecializedtraining,theirknowledgeandexperienceaswellastheir
knowledgeoftheapplicablestandards.
ÎAnyhazardsthatcouldbecausedinthevalvebytheprocessmediumandtheoperating
pressureorbymovingpartsaretobepreventedbytakingappropriateprecautions.
ÎIfinadmissiblemotionsorforcesareproducedinthepneumaticactuatorasaresultof
thesupplypressurelevel,itmustberestrictedusingasuitablesupplypressurereducing
station.
To avoid damage to any equipment, the following also applies:
ÎDonotoperatethedevicewiththebackofthedevice/ventopeningfacingupwards.
ÎDonotsealtheventopeningwhenthedeviceisinstalledonsite.
Vent opening
ÎProper shipping and storage are assumed.
Note:
Devices with a CE marking fulll the requirements of the Directive 2004/108/EC.
The Declaration of Conformity is available on request.
6 EB 8357 EN
Markings on the device
2 Markings on the device
2.1 Nameplate
SAMSON 4740 Limit Switch
Model 4740-
Var-ID Serial no.
SAMSON AG D-60314 Frankfurt
12
3
45
Made in Germany
1Markingtoindicatewithout/withsolenoidvalve
2Markingtoindicateinductive/mechanicalproximityswitch
3 Article code
4CongurationID
5Serial no.
2.2 Article code
Limit switch Type4740- 0 0 0 x x x x 0 0 x x
Type
InductiveproximitysensorNCB2-V3-NO 1
MechanicalmicroswitchXGG12-88-S20 5
Switching element
With two switching elements (standard) 2
Solenoidvalve
Without 0
24VDC 1
Pneumatic connection
Without 0
Push-inL-connectorQS-G
1
/
8
-6 1
ISO228/1-G
1
/
8
2
Specialversion
Without 0 0
EB 8357 EN 7
Design and principle of operation
3 Design and principle of oper-
ation
TheType4740LimitSwitchcanbemounted
ontothefollowingdevices:
−Type3353AngleSeatValve(seeFig.1)
−Type3354GlobeValve
−Type 3379 Pneumatic Actuator
Theinductiveproximityswitchesormicros-
witchescausesignalstobesenttoacontrol
oralarmsystemwhenthetravelexceedsor
fallsbelowtheadjustedlimit.
Thelimitswitchcanoptionallybettedwith
a3/2-waysolenoidvalve.Whentheinte-
gratedsolenoidvalveisenergized,supply
air is applied to the actuator. When the so-
lenoidvalveisde-energized,theactuatoris
ventedandthecontrolvalvemovestoitsfail-
safe position.
The switching points of the limit contacts can
bechangedwithinthetravelrangeafterin-
stallation.Seesection5.1onpage20.
3.1 Versions
TwoversionsoftheType4740LimitSwitch
areavailable:
−Withinductiveproximityswitches
−With microswitches
Fig. 1: Type4740 Limit Switch with optional
solenoid valve on a Type3353 Angle
Seat Valve
8 EB 8357 EN
Markings on the device
3.2 Technical data
Electric limit switch Type4740
Travelrange 0to15mm
Ambienttemperaturerange –20to+65°C
Degree of protection IP65
Version with inductive proximity switches
Nominalvoltage 8.2VDCoverisolatingswitchamplieraccordingtoEN60947-
5-6
Version with microswitches
Switching capacity 250VAC,16(6)A
Option: 3/2-way solenoid valve
Nominalvoltage 24VDC
Power 1.5W
Flow rate 55ln/min(KV=0.035)
Maximumoperatingpressure 7bar
Pneumatic connection Push-inL-connectorQS-G
1
/
8
-6orISO228/1-G
1
/
8
Materials
Housing Polyamide
Cover Polycarbonate
Filter Polyethylene
Mounting kit Stainless steel
Weight
Limit switch (including solenoid
valve) Approx.550g
Mounting kit Approx.180g
EB 8357 EN 9
Markings on the device
3.3 Dimensions in mm
121
Ø94 22
M20 x 1.5
10 EB 8357 EN
Mounting and start-up
4 Mounting and start-up
4.1 Mounting on Type3353
and Type3354 Valves
Note:
The mounting unit (1400-9922) is re-
quired to mount the limit switch onto
the Type3353 Angle Seat Valve and
the Type3354 Globe Valve.
4.1.1 Preparing the mounting
kit
ÎSee Fig. 2
WARNING!
Risk of cut injury due to sharp
thread.
Do not touch the sharp thread of the
adapter.
Note:
The spacer (4) is only required to
mount the limit switch onto a fail-
close (FA/NC) valve.
Limit switch with inductive proximity switch-
es
ÎThreadtheguidedbushing(2)withthe
beveledpart(2.1)facingdownwardon-
to the stem of the adapter (3.1), while
holding the screw inside the adapter sta-
tionary.
Limit switch with microswitches
ÎThreadtheguidedbushing(2)withthe
straight rim (2.2) facing downward onto
the stem of the adapter (3.1), while hold-
ing the screw inside the adapter station-
ary.
Fail-open (FE/NO) version
ÎThe spacer is not required.
Fail-open (FA/NC) version
ÎInsertthespacer(4)intothesleeveofthe
adapter (3.2) as far as it will go.
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