Samson 4765 Service-Handbuch

Translation of original instructions

EB 8359-1 EN

Edition March 2020

Type4765 Pneumatic Positioner

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.

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

(aftersalesservice@samsongroup.com).

The mounting and operating instructions for the devices are included in

the scope of delivery. The latest documentation is available on our website

at www.samsongroup.com > Service & Support > Downloads >

Documentation.

Denition 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

2 EB 8359-1 EN

Contents

EB 8359-1 EN 3

1 Safety instructions and measures ...................................................................5

1.1 Notes on possible property damage................................................................7

2 Markings on the device .................................................................................7

2.1 Article code...................................................................................................7

3 Design and principle of operation ..................................................................8

3.1 Accessories, mounting parts and conversion kits.............................................10

3.2 Technical data .............................................................................................11

3.3 Dimensions in mm........................................................................................12

4 Measures for preparation............................................................................13

4.1 Unpacking ..................................................................................................13

4.2 Transporting ................................................................................................13

4.3 Storage.......................................................................................................13

5 Mounting and start-up.................................................................................14

5.1 Attachment to valve with cast yoke ................................................................14

5.2 Attachment to valve with rod-type yoke..........................................................14

5.3 Housing cover .............................................................................................14

5.4 Pneumatic connections..................................................................................16

5.4.1 Pressure gauges...........................................................................................16

5.4.2 Supply pressure ...........................................................................................16

6 Operating the positioner..............................................................................17

6.1 Assignment of the positioner and actuator......................................................17

6.1.1 Determining and changing the operating direction .........................................18

6.2 Starting point and reference variable.............................................................20

6.3 Adjustment after mounting the positioner on the valve.....................................20

6.3.1 Setting the air delivery (volume restriction Q) and proportional band Xp..........20

6.3.2 Setting for actuator with fail-safe action “stem extends”...................................22

6.3.3 Setting for actuator version “stem retracts” .....................................................22

6.4 Exchanging the range spring........................................................................23

7 Upgrading the pneumatic positioner ............................................................24

8 Servicing.....................................................................................................26

8.1 Preparation for return shipment.....................................................................26

Contents

4 EB 8359-1 EN

9 Decommissioning and removal ....................................................................27

9.1 Decommissioning.........................................................................................27

9.2 Removing the positioner ...............................................................................27

9.3 Disposal......................................................................................................27

10 Annex.........................................................................................................28

10.1 After-sales service........................................................................................28

EB 8359-1 EN 5

Safety instructions and measures

1 Safety instructions and measures

Intended use

The SAMSON Type4765 Positioner is mounted on pneumatic control valves and used to

assign the valve position to the control signal. The device is designed to operate under

exactly dened conditions (e.g. operating pressure, temperature). Therefore, operators must

ensure that the positioner is only used in applications where the operating conditions

correspond to the technical data. In case operators intend to use the positioner 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4765 Positioner is not suitable for the following applications:

−Use outside the limits dened during sizing 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 specied by SAMSON

Qualications of operating personnel

The positioner 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.

Personal protective equipment

No personal protective equipment is required for the direct handling of the positioner. 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.

6 EB 8359-1 EN

Safety instructions and measures

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.

Safety features

Upon failure of the air supply, the positioner vents the actuator, causing the valve to move to

the fail-safe position determined by the actuator.

Warning against residual hazards

The positioner has direct inuence on the control valve. 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 operating 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.

If inadmissible motions or forces are produced in the pneumatic actuator as a result of the

supply pressure, it must be restricted using a suitable supply pressure reducing station.

Responsibilities of the operator

The operator is responsible for proper operation and compliance with the safety regulations.

Operators are obliged to provide these mounting and operating instructions to the operating

personnel and to instruct them in proper operation. Furthermore, the operator must ensure

that operating personnel or third persons 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.

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 positioner is

mounted (valve, actuator, valve accessories etc.).

EB 8359-1 EN 7

Markings on the device

1.1 Notes on possible property damage

NOTICE

Risk of malfunction due to failure to comply with air quality requirements.

ÎOnly use supply air that is dry and free of oil and dust.

ÎRead the maintenance instructions for upstream pressure reducing stations.

ÎBlow through all air pipes and hoses thoroughly before connecting them.

2 Markings on the device

2.1 Article code

Pneumatic positioner Type4765- 0 1 x0 0 x1x0000

Spring

Spring 1, travel = 15 mm 1

Spring 2, travel = 30 mm, split range 15 mm 2

Spring 3, travel = 60 mm, split range 30 mm 3

Pneumatic connections

ISO228/1G¼ 1

¼-18NPT 3

Temperature range

Standard 0

Low temperature down to –50 °C 1

8 EB 8359-1 EN

Design and principle of operation

3 Design and principle of oper-

ation

The pneumatic positioner is used to assign

the valve position (controlled variable) to the

input signal (reference variable). The posi-

tioners compare the control signal of a con-

trol system to the travel of the control valve

and issues a signal pressure (output variable)

for the pneumatic actuator.

The positioner consists of the lever with shaft

and range spring, the measuring diaphragm

and the pneumatic control system with noz-

zle, apper plate and booster. In addition, a

pressure gauge can optionally be attached

for the control signal (input) and the signal

pressure (output signal).

The positioner operates according to the

force-balance principle. In this way, the

motion of the actuator stem or the plug stem

(controlled variable x) is transmitted to the

lever (1) and the range spring (6) over the

plate (20). This action twists the range spring

and varies its spring force.

The reference variable, i.e. the control signal

(pe) of the upstream controller, produces a

force which acts on the surface of the mea-

suring diaphragm (8) and is compared to

the force of the range spring (6). At the same

time, the motion of the measuring dia-

phragm is transferred to the apper plate

(10.2) over the feeler pin (9.1) and the noz-

zle (10.1) releases pressure. The supply air is

fed to the booster (12) and ows through the

Xp restriction (13) and the nozzle (10.1) and

hits the apper plate (10.2).

Any change in the control signal peor the

valve position causes the pressure to change

upstream or downstream of the booster. The

air controlled by the booster (signal pressure

pst) ows through the volume restriction (14)

to the pneumatic actuator, causing the plug

stem to move to a position corresponding to

the reference variable.

The adjustable restrictions (13 and 14) are

used to optimize the positioner control loop.

The range spring (6), which can be ex-

changed, is assigned to both the rated valve

travel and the span of the reference variable.

Legend for Fig.1 and Fig.2

1 Lever for valve travel

1.1 Shaft

2Pin

2.1 Nut

3 Sleeve

4 Zero point adjustment

5 Fastening screw

6 Range spring

6.1 Bracket

7 Fastening screw

8 Measuring diaphragm

9 Diaphragm lever

9.1 Feeler pin

10 Nozzle block

10.1 Nozzle

10.2 Flapper plate

11 Cover plate

12 Booster

13 Xp restriction

14 Volume restriction Q

15 Hole for fastening screw

20 Plate

EB 8359-1 EN 9

Design and principle of operation

10.21314

45 6.1 6

Output

Supply 9Input

Fig.1: Positioner (opened)

1.1 122.1 20

9.1

10.2

10.1

pst

Output 38

Supply 9 pe

Input

9.1

12.2

10.1

Travel

Arrangement of nozzle/

apper plate for reverse

<> operating direction

Fig.2: Functional diagram

10 EB 8359-1 EN

Design and principle of operation

3.1 Accessories, mounting parts and conversion kits

Accessories – Mounting parts Ordering number

Range spring 1

Range spring 2

Range spring 3

Lever I

Lever extension

Pressure gauge attachment, up to device index .02

Pressure gauge attachment, device index .03 and higher

Pressure gauge attachment (copper-free), up to device index .02

Pressure gauge attachment (copper-free), device index .03 and higher

1190-0736

1190-0737

1190-0738

1690-6469

1400-6716

1400-6718

1402-0938

1400-6719

1402-0939

Mounting kit for valves with cast yoke according to NAMUR

Valves with rod-type yoke according to NAMUR for 18 to 35mm rod diameter

1400-5745

1400-5745 and

1400-5342

Assortment of spare parts including gaskets and diaphragms 1400-6792

Assortment of spare parts including gaskets, diaphragms and pneumatic parts

(for devices with device index .02 and higher)

1402-0040

Upgrade to degree of protection IP65:

Venting over check valve 1790-7408

Required input signal

(reference variable) Required i/p module

Type (order no.)

Additional conversion kit

(device index .03 and higher)

Order no.

4 to 20 mA

0 to 20 mA

1 to 5 mA

6109-0010

6112-002110

6112-003110

1400-6797

1400-6798

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