SH 8310 EN
Translation of original instructions

Types 3271 and 3277 Pneumatic Actuators

Edition March 2022

Definition of signal words! DANGER
Hazardous situations which, if not avoided,
will result in death or serious injury! WARNING
Hazardous situations which, if not avoided,
could result in death or serious injury

2! NOTICE
Property damage message or malfunction
Note
Additional information
Tip
Recommended action

SH 8310 ENPurpose of this manual
The Safety Manual SH 8310 contains information relevant for the use of the Type 3271 andType 3277 Pneumatic Actuators in safety-instrumented systems according to IEC 61508 andIEC 61511. The safety manual is intended for planners, constructors and operators of safetyinstrumented systems.
! NOTICE
Risk of malfunction due to incorrect mounting, connection or start-up of the device.
Î Refer to Mounting and Operating Instructions EB 8310-X for details on how to mount thedevice, perform the pneumatic connections as well as start up the device.
Î Observe the warnings and safety instructions written in the Mounting and OperatingInstructions EB 8310-X.

Further documentation
The documents listed below contain descriptions of the start-up, functioning and operation of
the pneumatic actuators. You can download these documents from the SAMSON website.
Type 3271 and Type 3277 Pneumatic Actuators up to 750v2 cm² actuator areau T 8310-1:
Data sheet
u EB 8310-1: Mounting and operating instructions (120 cm²)
u EB 8310-4: Mounting and operating instructions (355v2 cm²)
u EB 8310-5: Mounting and operating instructions (175v2, 350v2 and 750v2 cm²)
u EB 8310-6: Mounting and operating instructions (240, 350 and 700 cm²)
Type 3271 Pneumatic Actuator, 1400-60 cm² actuator areau T 8310-3:
Data sheet
u EB 8310-3: Mounting and Operating Instructions
Type 3271 Pneumatic Actuator, 1000, 1400‑120, 2800 and 2 x 2800 cm² actuator areasu T 8310-2:
Data sheet
u EB 8310-2: Mounting and operating instructions (1000 cm²)
u EB 8310-7: Mounting and operating instructions (1400-120, 2800, 2 x 2800 cm²)
NoteIn addition to the actuator documentation, observe the technical documentation for the valve
and valve accessories.

SH 8310 EN3

4SH 8310 EN

Contents

1

Scope............................................................................................................6General.........................................................................................................6
Use in safety-instrumented systems...................................................................6Versions and ordering data.............................................................................6Mounting.......................................................................................................72

Technical data................................................................................................83

Safety-related functions................................................................................11Emergency venting........................................................................................11Fail-safe action.............................................................................................11
Protection against unauthorized changes to the configuration...........................114Mounting, connection and start-up................................................................115Required conditions......................................................................................12Selection......................................................................................................12Mechanical and pneumatic installation...........................................................12Operation....................................................................................................13
Maintenance................................................................................................13

6

Proof testing.................................................................................................14
Visual inspection to avoid systematic failure....................................................14
Function testing.............................................................................................15

7Repairs........................................................................................................16SH 8310 EN5

Scope1 Scope
GeneralThe Type 3271 and Type 3277 Pneumatic Actuators are single-acting linear actuators withspring return mechanism for mounting on valves. The actuators are used to move the valve
plug.
Use in safety-instrumented systems
The pneumatic actuators can be used in safety-instrumented systems according to IEC 61508
and IEC 61511. The actuators can be used in safety-instrumented systems up to SIL 2 (singledevice) and SIL 3 (redundant configuration) on observing the requirements of IEC 61508.
The safety-instrumented function of the actuators is to be regarded as a Type A element inaccordance with IEC 61508-2.
NoteThe architecture and the interval between proof tests must be considered concerning the safety integrity level.
Tip
Through the use of a positioner with diagnostic features on the control valve, the diagnostic
coverage can be increased and, as a result, the probability of failure on demand reduced.
Versions and ordering data
Type 3271 and Type 3277 Pneumatic Actuators are suitable for safety-instrumented systems,
provided they do not have a travel stop or handwheel. Actuators with travel stop or handwheel can be identified by the mounted construction on the top diaphragm case (see Fig. 1).

6SH 8310 EN

ScopeFig. 1: Actuator versions not suitable for use in safety-instrumented systems

Mounting
The pneumatic actuators are mounted on valves as described in the associated actuator documentation.

SH 8310 EN

7

Technical data

2 Technical data
Table 1: Technical data for actuator areas up to 750v2 cm²Actuator areacm²

175v2 · 350v2 ·355v2 · 750v2

240 · 350 · 700

Max. supply pressure

120Type 3271‑5/Type 3277‑5

6 bar 1)
Diaphragm material NBR: –35 to +90 °C 2) 4)

Permissible ambient
temperatures

Diaphragm material EPDM: –50 to 120 °C 3) 4)
Diaphragm material
PVMQ:–60 to +90 °C 4)–Degree of protection

Diaphragm material
NBR:–35 to +80 °C 2)

IP 54 6)

Materials
Actuator stem
Actuator stem sealing

Enclosure1.4404NBR
EPDM
1.0332/1.0335
Sheet steel, painted
Ambient temperature≥–50 °C

1.0976/1.0982
Sheet steel, painted
Ambient temperature≥–60 °C

1.4305NBR

Die-cast aluminum,painted

1.4301 · Stainless sheet steel · Ambient
temperature ≥–60 °C 5)1)
2)
3)
4)
5)
6)

8Observe supply pressure restrictions.
In on/off service, lowest temperature restricted to –20 °C
In on/off service, lowest temperature restricted to –40 °C
Install vent plug (u AB 07) for temperatures below –20 °C.
1.4301 not available for 355v2 cm²
The pneumatic actuators do not pose any risk in the sense of the protection requirements describedin DIN EN 60529. The IP rating depends on the connecting parts used on the pressurized side andthe spring chamber side of the actuator. In this case, components (air vents as well as valvesaccessories, such as solenoid valves, positioners etc.) must be used that comply with therequirements. The maximum rating that can be achieved with the standard air vent is IP 54
u AB 07. Depending on the IP rating of the valve accessories, a maximum rating of IP 66 can beachieved for an actuator with air purging of the actuator spring chamber.

SH 8310 EN

Technical data

Table 2: Technical data for 1000, 1400-120, 2800 and 2 x 2800 cm² actuator areas
Actuator area

cm²1000

1400-120

Max. supply pressure2800
6 bar2 x 2800

1)

Diaphragm material NBR: –35 to +90 °C 2) 3)

Permissible ambient temperatures

Diaphragm material PVMQ: –60 to +90 °C 3)

Degree of protection

IP 54 5)Materials
Actuator stem
Actuator stem sealing

Housing and associatedambient temperature

1)
2)
3)
4)
5)

1.4548.4

1.44041.4548.4

NBR

NBR

EPDM

PVMQ

1.0982
S460 MC
Sheet steel,painted≥–60 °C

EN-JS1030 (GGG-40) 4)
Spheroidal graphite ironMax. 100 °C
1.5638/A352 LC3Painted cast steel≥–60 °C

Observe supply air restrictions.
In on/off service, lowest temperature restricted to –20 °C
Install vent plug (u AB 07) for temperatures below –20 °C.
Not with diaphragm material PVMQ
The pneumatic actuators do not pose any risk in the sense of the protection requirements describedin DIN EN 60529. The IP rating depends on the connecting parts used on the pressurized side andthe spring chamber side of the actuator. In this case, components (air vents as well as valvesaccessories, such as solenoid valves, positioners etc.) must be used that comply with therequirements. The maximum rating that can be achieved with the standard air vent is IP 54
u AB 07. Depending on the IP rating of the valve accessories, a maximum rating of IP 66 can beachieved for an actuator with air purging of the actuator spring chamber.

SH 8310 EN

9Technical data

Table 3: Technical data for 1400-60 cm² actuator area
Actuator area
Max. supply pressure

1400-60 cm²6 bar 1)
Diaphragm material NBR: –35 to +90 °C 2)

Permissible ambient temperatures
Degree of protection

Diaphragm material EPDM: (with air free of oil andgrease): –50 to +120 °C 3)
IP 54 4)

Materials
Rolling diaphragm

NBR (nitrile butadiene rubber)
Butyl with fabric reinforcement
EPDM with fabric reinforcement

Actuator stem
Actuator stem sealing
Diaphragm cases
1)
2)
3)
4)

10

1.4404NBR (nitrile butadiene rubber)
EPDM
Sheet steel, plastic-coatedObserve supply pressure restrictions.
In on/off service, lowest temperature restricted to –20 °C.
In on/off service, lowest temperature restricted to –40 °C.
The pneumatic actuators do not pose any risk in the sense of the protection requirements describedin DIN EN 60529. The IP rating depends on the connecting parts used on the pressurized side andthe spring chamber side of the actuator. In this case, components (air vents as well as valvesaccessories, such as solenoid valves, positioners etc.) must be used that comply with therequirements. The maximum rating that can be achieved with the standard air vent is IP 54
u AB 07. Depending on the IP rating of the valve accessories, a maximum rating of IP 66 can beachieved for an actuator with air purging of the actuator spring chamber.

SH 8310 ENSafety-related functions

3 Safety-related functions
Emergency venting
The signal pressure creates a force at the diaphragm surface, which is opposed by thesprings in the actuator. Depending on which direction the signal pressure is applied, theactuator stem retract or extends, opening or closing a globe valve. The fail-safe action istriggered when no signal pressure is applied to the actuator.
Fail-safe action
The actuator is vented. As soon as the actuator is vented (signal pressure = atmosphericpressure), the spring forces cause the actuator stem to move to the fail-safe position.
Depending on how the springs are arranged in the valve, the actuator's direction of action iseither "actuator stem extends" or "actuator stem retracts".
Protection against unauthorized changes to the configuration
The actuator's direction of action can be reversed. However, this is not possible while theprocess is running.

4 Mounting, connection and start-up
Refer to Mounting and Operating Instructions u EB 8310-X for details on how to mount,perform the pneumatic connections as well as start up the pneumatic actuator.

SH 8310 EN

11Required conditions

5 Required conditions! WARNING
Risk of malfunction due to incorrect selection or wrong installation and operating conditions.
Î Only use actuators in safety-instrumented systems if the necessary conditions in the plant
are fulfilled.
Tip
We recommend checking the necessary conditions using a checklist. Examples of such checklists are included in VDI 2780-5 and the SAMSON brochure WA 236 (Functional safety of
globe valves, rotary plug valves, ball valves and butterfly valves).
SelectionÎ The suitability of the entire control valve assembly (valve, actuator, valve accessories) for
the intended use has been checked.
Î The thrust is sufficiently large to keep the prescribed actuating time and to move the valve
to the end position in the event of emergency despite the prevailing pressure.
Î The actuator is suitable for the ambient temperature (see Table 1, Table 2 and Table 3).
Î The temperature limits are observed.
Î The actuator does not have a travel stop or handwheel.
Mechanical and pneumatic installation
Î The actuator is mounted properly as described in the mounting and operating instructions
and connected to the air supply.
Î The actuator is configured with the correct direction of action (stem extends or retracts).
Î The pneumatic air supply meets the instrument air specifications.

12Particle size and quantity

Oil content

Pressure dew point

Class 4

Class 3

Class 3≤5 µm and 1000/m³≤1 mg/m³–20 °C or at least 10 K below the lowest ambient temperature to be expected

SH 8310 EN

Required conditions

Î The supply air line and vent plug are designed in such a way that the functioning of thecontrol valve is ensured. The minimum cross section of the supply air line is observed. Thevent plug is not sealed.
Î The supply pressure does not exceed the maximum limit. The supply pressure restrictions
are observed.
Î The tightening torques are observed.
OperationÎ The actuator stem is not blocked.
Î The medium flow through the valve is not blocked.
Î The actuator is only used in operating conditions that meet the specifications used for sizing at the ordering stage.
MaintenanceÎ Maintenance is only performed by fully trained, qualified operating personnel.
Î Only original parts are used for spare parts.
Î Service work is performed as described in the section on servicing or maintenance in theassociated actuator documentation.
Tip
Contact SAMSON's After-sales Service Department concerning any work not described inthe section on servicing or maintenance in the associated actuator documentation.

SH 8310 EN

13

Proof testing

6 Proof testing
The proof test interval and the extent of testing lie within the operator's responsibility. The
operator must draw up a test plan, in which the proof tests and the interval between them
are specified. We recommend summarizing the requirements of the proof test in a checklist.
! WARNING
Risk of dangerous failure due to malfunction in the event of emergency (actuator is notvented or the valve does not move to the fail-safe position).
Î Only use devices in safety-instrumented systems that have passed the proof test according
to the test plan drawn up by the operator.
! NOTICEMalfunction due to a non-observance of the required inspection requirements.
To test the fail-safe action properly, the following requirements must be met:
− The actuator is mounted properly on the valve.
− The control valve is installed properly into the plant.
Regularly check the safety-instrumented function of the entire SIS loop. The test intervals are
determined, for example on calculating each single SIS loop in a plant (PFDavg).
Tip
We recommend performing the proof tests based on a checklist. An example of such achecklist is included in the SAMSON brochure WA 236 (Functional safety of globe valves,
rotary plug valves, ball valves and butterfly valves).

Visual inspection to avoid systematic failure
To avoid systematic failure, inspect the actuator regularly. The frequency and the scope of theinspection lie within the operator's responsibility. Take application-specific influences into account, such as:− Dirt blocking the pneumatic connections− Actuator stem blocked− Corrosion (destruction primarily of metals due to chemical and physical processes)

14

SH 8310 EN

Proof testing− Material fatigue− Aging (damage caused to organic materials, e.g. plastics or elastomers, by exposure tolight and heat)− Chemical attack (organic materials, e.g. plastics or elastomer, which swell, leach out ordecompose due to exposure to chemicals)! NOTICE
Risk of malfunction due to the use of unauthorized parts.
Î Only use original parts to replace worn parts.

Function testing
Regularly check the safety function according to the test plan drawn up by the operator.
Note
Record any faults in the actuator and inform SAMSON of them in writing.
Emergency venting
1. Apply supply air within the permissible range to the actuator which allows the valve tomove to the maximum travel.
2. Adjust the supply pressure so that the valve moves to approx. 50 % of its travel.
3. Shut off supply pressure. This must cause the valve to move to its fail-safe position.
4. Check whether the actuator is fully vented within the demanded time.
Tip
Connect a pressure gauge to check that the actuator has completely vented.

SH 8310 EN

15

Repairs

7 Repairs
Only perform the work on the pneumatic actuator described in u EB 8310-X.
! NOTICE
Safety-instrumented function impaired due to incorrect repair.
Î Only allow trained staff to perform service and repair work.

16SH 8310 ENHERSTELLERERKLÄRUNG

MANUFACTURER’S DECLARATION

Für folgende Produkte

For the following products

Pneumatische Antriebe Typen 3271
und 3277 mit Antriebsfläche [cm²]:
120, 175v2, 240, 350, 350v2, 700, 355v2,750v2, 1000, 1400-120, 2800 und 2x2800

Types 3271 and 3277 Pneumatic
Actuators with actuator areas [cm²]:
120, 175v2, 240, 350, 350v2, 700,355v2, 750v2, 1000, 1400-120, 2800,
and 2x2800

Hiermit wird bestätigt, dass die o. g. Geräte für die
Verwendung in sicherheitsgerichteten Systemennach IEC 61508 und IEC 61511 einsetzbar sind.

We hereby certify that the above mentioneddevices can be used in safety-instrumented
systems according to IEC 61508 and IEC 61511.

Die Geräte sind geeignet für den Einsatz in sicherheitsgerichteten Anwendungen bis SIL 2 (einzelnes Gerät) und SIL 3 (redundante Verschaltung)gemäß IEC 61508 (Systematische Eignung SC 3).

The devices are suitable for use in safetyinstrumented systems up to SIL 2 (singledevice) and SIL 3 (redundant configuration)according to IEC 61508 (Systematic CapabilitySC 3).

Der Nachweis erfolgte auf der Basis der Betriebsbewährtheit kombiniert mit einer FMEA.
Sicherheitstechnische Kenndaten
λsafe, undetected
λdangerous, undetected
λdangerous, detected
PFDavg bei jährlicher Prüfung
HFT (Hardware Fault Tolerance)

DC (Diagnostic Coverage)
Gerätetyp
SFF (Safe Failure Fraction)
MTBFgesamt
MTBFdangerous, undetected

1 FIT = 1 Ausfall pro 109 Stunden

The evidence is based on prior use combinedwith an FMEA.
Safety-related data

301 FIT
19,2 FIT0 FIT-58,42 · 1000A
94 %356 Jahre
5940 Jahre

λsafe, undetected

λdangerous, undetected
λdangerous, detected
PFDavg with annual test
HFT (Hardware Fault Tolerance)

DC (Diagnostic Coverage)
Device type
Safe failure fraction (SFF)
MTBFtotal
MTBFdangerous, undetected

1 FIT = 1 failure per 109 hours

301 FIT19.2 FIT0 FIT-5
8.42 · 1000A
94 %356 years
5940 years

Nutzbare Lebensdauer
Nach IEC 61508-2 Abschnitt 7.4.9.5 können acht
bis zwölf Jahre angenommen oder ein Wert benutzt werden, der sich durch frühere Vewendung(Betriebsbewährung) des Anwenders ergibt.

Useful lifetime
According to IEC 61508-2, section 7.4.9.5, auseful lifetime of eight to twelve years can beassumed. Other values can be used based on
the user’s previous experience (prior use).

Bestimmungsgemäße Verwendung– Bedienungsanleitung, Sicherheitshandbuch

Intended use– Operating instructions, safety manual– Anforderung an Instrumentenluft-Qualität–

Manufacturer's Declaration: V/HE-1121-4 DE-EN

Changed on: 2017-04-25

Quality requirements for instrument air

Changed by: V42/nfl/V74/fix/V73/pmr

SAMSON AKTIENGESELLSCHAFT · Weismuellerstrasse 3 · 60314 Frankfurt am Main, Germany · www.samson.de

SH 8310 EN

117

Sicherheitstechnische Annahmen
Im Störfall wird der Antrieb entlüftet, dadurch fährt
das Ventil in die Sicherheitslage.

Safety-related assumptions
In case of failure, the actuator is vented, causing
the valve to move to its fail-safe position.

HinweisNote

Durch Einsatz eines Stellungsreglers kann eine
umfangreiche Diagnose auch im laufenden Betrieb
durchgeführt werden. Damit kann sich je nach
Einsatzfall ein Diagnosegrad (diagnostic coveragefactor) für gefährliche Fehler von ≥ 70 % ergeben.

A positioner can be used to perform extensive
diagnostics while the process is running. Depending on the application, this may result in adiagnostic coverage for dangerous failures of
70 % or higher.

VoraussetzungenRequirements

Die Reparaturzeit ist klein gegenüber der mittleren
Anforderungsrate. Durchschnittliche Beanspruchung in industrieller Umgebung durch Medien undUmgebungsbedingungen. Der Anwender ist fürbestimmungsgemäßen Gebrauch verantwortlich.

Short mean time to repair compared to the average rate of demand. Normal exposure to industrial environment and fluids. The user is responsible for ensuring that the device is used as intended.

SAMSON AGSAMSON AG

i.V. Dr. Michael Heß
Zentralabteilungsleiter
Product Management and Technical Sales

i.V. Dirk Hoffmann
Zentralabteilungsleiter
Entwicklungsorganisation

Director
Product Management and Technical Sales

Director
R&D Organization

Manufacturer's Declaration: V/HE-1121-4 DE-EN

Changed on: 2017-04-25

Changed by: V42/nfl/V74/fix/V73/pmr

SAMSON AKTIENGESELLSCHAFT · Weismuellerstrasse 3 · 60314 Frankfurt am Main, Germany · www.samson.de182SH 8310 EN

SH 8310 EN19SAMSON AKTIENGESELLSCHAFT
Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: +49 69 4009-0 · Fax: +49 69 4009-1507
samson@samsongroup.com · www.samsongroup.com

2022-10-12 · English

SH 8310 EN