T 8384-0 EN
Type 3730-0 Electropneumatic Positioner
Series 3730

Application
Single-acting or double-acting positioner for attachment to pneumatic control valves
Set point		

4 to 20 mA

Travel		

5.3 to 200 mm

The positioner ensures a predetermined assignment of the valve position (controlled variable x) to the input signal (set pointw). It compares the input signal received from a control system
to the travel of the control valve and issues a corresponding
output signal pressure (output variable y).
Special features• Simple attachment to common linear actuators with interface for SAMSON direct attachment, NAMUR rib, valves
with rod-type yokes according to IEC 60534-6 (Fig. 1)
and attachment according to VDI/VDE 3847
• Any desired mounting position of the positioner• Calibrated travel sensor without gears susceptible to wear
• Analog pneumatic output prevents pulsing in case of leaking actuator• Fast-reacting analog control loop
• High control accuracy (fine tuning) without dead band andcontinuous pneumatic output• Two-wire system with small electrical load below 300 Ω forexplosion-protected version and version without explosion
protection• Output pressure limitation enabled by DIP switch• Selectable tight-closing function with fixed switching point• Low air consumption of approx. 110 ln/h independent of
supply and output pressure• Aluminum housing with IP 66 degree of protection• Check valve in the exhaust air port
• Resistant to shock and vibrations• Extended temperature range also for intrinsically safe operation• Travel range selectable within the rated travel range by
setting DIP switch• Zero and span adjusted by potentiometers• Set point range and direction of action adjustable by setting DIP switches, e.g. for split-range operation

Direct attachment to Type 3277
Pneumatic Actuator

Attachment toType 3510 Micro-flow Valve

Attachment toNAMUR rib

Additional options–Stainless steel housing

Bild 1: Type 3730-0 Positioner

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

Edition April 2021

Principle of operation

The supply air is supplied to the booster and the pressure regulator (8). An intermediate flow regulator (9) with fixed settings is used to purge the positioner and, at the same time,
guarantees trouble-free operation of the booster.

The positioner is mounted on pneumatic control valves and isused to assign the valve position (controlled variable x) to thecontrol signal (set point w). The positioner compares the electric control signal of a control system to the travel of the control valve and issues a signal pressure (output variable y) forthe pneumatic actuator.

The output signal pressure supplied by the booster can be limited by enabling the DIP switch setting S5 (4).
The volume restriction (10) and the DIP switch S6 (4) are used
to optimize the positioner by adapting it to the actuator sizeand changing the gain factor.

The positioner consists of a travel sensor system proportional
to resistance, an analog i/p converter with a downstream air
capacity booster and the electronics with microcontroller.
The position of the valve stem is transmitted as a linear travel
motion over the pick-up lever to the travel sensor (2) and supplied to an analog PD controller (3). The PD controller compares this actual value to the DC control signal coming from thecontrol system, e.g. a 4 to 20 mA signal. In case of a systemdeviation, the activation of the i/p converter (6) is changed sothat the actuator of the control valve (1) is pressurized or vented accordingly over the downstream booster (7).

Operation
The user can adjust the potentiometers and DIP switches to change the positioner settings. The configuration of the positioner is facilitated by instructions included on the inside of thecover which are intended to ensure a quick and trouble-freeadaptation of the positioner to the control valve.

This causes the valve plug to move to the position determinedby the set point.

43wx2

698Q
710y1x1234678910Actuator
Travel sensor
Analog PD controller
DIP switches S1 to S10i/p module
Air capacity booster
Pressure regulator
Flow regulator
Volume restriction

Bild 2: Functional diagram of Type 3730-0 Positioner

2T 8384-0 ENTabelle 1: Technical data
Type 3730-0 Positioner (technical data in test certificates additionally apply to explosion-protected devices)TravelAdjustable

5.3 to 30 mm

Attachment to Type 3510 Micro-flow Valve

5.3 to 15 mm

Attachment according to IEC 60534-6 (NAMUR)

5.3 to 200 mm

Adjustable within the initialized travel/angle of rotation; travel can be restricted to 1/5 at themaximum

Travel range

Set point w

Direct attachment to Type 3277 Actuator

Signal range

4 to 20 mA, 4 to 12 mA and 12 to 20 mA
Setting with DIP switches S6 and S7

Static destruction limit

100 mA

Minimum current

3.6 mA

Load impedance≤ 6 V (corresponding to 300 Ω at 20 mA)

Supply air

Supply air

1.4 to 7 bar (20 to 105 psi)Air quality acc. toISO 8573-1 (edition2001-02)

Max. particle size and density: Class 4 · Oil content: Class 3 · Pressure dew point: Class 3 or atleast 10 K below the lowest ambient temperature to be expected

Signal pressure (output)

0 bar up to the capacity of the supply pressure
Limitation to approx. 2.4 bar enabled by setting DIP switch S5

Characteristic

Linear ·Hysteresis≤1 %Sensitivity≤0.1 %

Direction of action

Adjustable by changing DIP switch S4 setting

Air consumption
Air output capacity

Independent of supply air approx. 110 ln/h at a supply pressure of 4 bar
Actuator filled with air

At Δp = 6 bar: 8.5 mn³/h· At Δp = 1.4 bar: 3.0 mn³/h· KVmax(20 °C) = 0.09

Actuator vented

At Δp = 6 bar: 14.0 mn³/h·· KVmax(20 °C) = 0.15

Permissible ambient temperature

Influences

Deviation ≤1 %At Δp = 1.5 bar: 4.5 mn³/h–20 to 80 °C · –45 to 80 °C with metal cable gland
The limits in the test certificate additionally apply for explosion-protected versions

Temperature≤0.15 %/10 K

Supply airNoneEffect of vibration≤0.25 % up to 2000 Hz and 4 g according to IEC 770

Electromagnetic compatibility

Complying with EN 61000-6-2, EN 61000-6-3, EN 61326-1 and NAMUR Recommendation
NE 21

Electrical connections

One M20 x 1.5 cable gland for 6 to 12 mm clamping range · Second M20 x 1.5 threaded
connection additionally exists · Screw terminals for 0.2 to 2.5 mm² wire cross-sections

Explosion protection

See Table 2

Degree of protection

IP 66/NEMA 4X
Observing the requirements of IEC 61508, the systematic capability of the pilot valve for emergency venting as a component in safety-instrumented systems is given.

Use in safety-instrumented systems (SIL)

Use is possible on observing the requirements of IEC 61511 and the required hardware fault tolerance in safety-instrumented systems up to SIL 2 (single device/HFT = 0) and SIL 3 (redundantconfiguration/HFT = 1).

Weight

1.0 kgMaterials

Compliance

T 8384-0 EN

Housing

Die-cast aluminum EN AC-AlSi12(Fe) (EN AC-44300) acc. to DIN EN 1706, chromated andpowder coated · Special version: stainless steel 1.4408

External parts

Stainless steel 1.4404/316L

Cable gland

M20x1.5, black polyamide
·3

210

Dimensions in mm

M20x1.5405828Lever
Output (38)Supply (9)86164143480

Direct attachment

Pressure gauge bracket
G ¼ or ¼ NPT

Attachment according toIEC 60534-6 (NAMUR)

or connecting plate

Lever

7058
154634200

Attachment according
to VDI/VDE 3847

164

6224

Attachment to
NAMUR rib

164

164

Attachment toSAMSON Type 3277

Lever

13

Lever

6238

Lever

4

Lever

xyz

S

17 mm

25 mm

33 mm

M25 mm

50 mm

66 mm

L70 mm

100 mm

116 mm

XL

100 mm

200 mm216 mmzyx

16
10...17

T 8384-0 EN

Tabelle 2: Explosion protection certificates
TypeCertification-011)

STCC

PTB 03.ATEX 2099

Date

2016-04-19

NumberRU C-DE.AA87.B.01278

Date

2018-11-30

Valid until

2023-11-29

Number

ZETC/15/2018

Date

2018-04-27

Valid until

2021-04-26

Number1613095

Date

2005-02-11

Number

3021579Date

2004-12-01

Number

PTB 03.ATEX 2099

Date

2016-04-19

Number

ZETC/15/2018

Date

2018-04-27

Valid until

2021-04-26

Number

TC17330

Date

2020-07-29

Valid until

2023-07-28

Number

PTB 03.ATEX 2179 X

Date

2013-09-17

NumberRU C-DE.AA87.B.01278

Date

2018-11-30

Valid until

2023-11-29

Number

ZETC/15/2018

Date

2018-04-27

Valid until

2021-04-26-03

CSA

Type of protection/comments
Number3730

FM-05

1)

-07

STCCJIS-08

2)

STCC
1)
2)

II 2G Ex ia IIC T6 Gb
II 2D Ex ia IIIC T80°C Db
1Ex ia IIC T6/T5/T4 Gb X
Ex tb IIIC T 80°C Db X

II 2G Ex ia IIC T6 Gb
II 2D Ex ia IIIC T80 °C Db
Ex ia IIC T6; Class I, Zone 0
Class II, Groups E, F, GEx nA II T6; Class I, Zone 2Class II, Div. 2, Groups E, F, G
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, GII 2D Ex tb IIIC T80°C Db IP66

II 2D Ex tb IIIC T80 °C Db

Ex ia IIC T6

II 3G Ex nA II T6
II 3G Ex ic IIC T6
II 3D Ex tc IIIC T80°C IP66
2Ex nA IIC T6/T5/T4 Gc X
2Ex ic IIC T6/T5/T4 Gc X
Ex tc IIIC T 80°C Dc X
II 3G Ex nA IIC T6 Gc
II 3D Ex tc IIIC T80 °C Dc

EC type examination certificate
Statement of conformity

T 8384-0 EN5Article code
Positioner

Type 3730-0x00000000x00x0xxExplosion protection
Without0ATEX

II 2G Ex ia IIC T6 Gb; II 2D Ex ia IIIC T80°C Db

1FM/CSAClass I, Zone 0 AEx ia IIC; Class I, II, III, Div.1, Groups A–G;
Class I, Div.2, Groups A–D; Class II, Div.2, Groups F, G/Ex ia IIC T6; Class I, Zone 0; Class II, Groups E–G;
Ex nA II T6; Class I, Zone 2; Class II, Div. 2, Groups E–G3ATEX

II 2D Ex tb IIIC T80°C Db IP66

5JIS

Ex ia IIC T6

7ATEX

II 3G Ex nA II T6; II 3G Ex ic IIC T6; II 3D Ex tc IIIC T80°C IP66

8Housing materialAluminum

0Stainless steel 1.4581

1Special applications
Without

0Compatible with paint1

Exhaust air with ¼ NPT connection, back of housing sealed

2Special version
00EAC

Without
1Ex ia IIC T6/T5/T4 Gb X; Ex tb IIIC T 80°C Db X

1

14EAC

2Ex nA IIC T6/T5/T4 Gc X; 2Ex ic IIC T6/T5/T4 Gc X;Ex tc IIIC T 80°C Dc X

820

With additional vent hole and VDI/VDE 3847 adapter, without travel pick-off parts

6With additional vent hole

76T 8384-0 EN

Mounting the positioner

Ordering text

The Type 3730 Electropneumatic Positioner can be attacheddirectly to the Type 3277 Actuator over a connection block.

Type 3730-0x Positioner

In actuators with fail-safe action “actuator stem extends” andType 3277-5 Actuator (120 cm²), the signal pressure is routed
over an internal hole in the actuator yoke to the actuator.
In actuators with fail-safe action “actuator stem retracts” andin actuators with effective diaphragm areas of 175 cm² or larger, the signal pressure is routed to the actuator over ready-made external piping.
Using the appropriate bracket, the positioner can also be attached according to IEC 60534-6-1 (NAMUR recommendation). The positioner can be mounted on either side of the control valve.
A special version of the positioner allows it to be attached according to VDI/VDE 3847. This type of attachment allows thepositioner to be replaced quickly while the process is runningby blocking the air in the actuator. The positioner can be attached directly to the Type 3277 Actuator using an adapter
bracket or adapter block. Alternatively, it can be attached tothe NAMUR rib of a control valve using an additional
NAMUR connection block.

T 8384-0 EN–

Without pneumatic connecting rail
(only when directly attached to Type 3277)–

With pneumatic connecting rail ISO 228/1-G ¼–

With pneumatic connecting rail ¼-18 NPT–

Without/with pressure gauge up to max. 6 bar–

Attachment to Type 3277 Actuator (120 to 750 cm²)–

Attachment acc. to IEC 60534-6-1 (NAMUR)
Travel: ... mm, if applicable, stem diameter: ... mm–

Attachment according to VDI/VDE 3847
Valve travel: ... mm, if applicable, rod diameter: … mm

–Adapter M20x1.5 to ½ NPT–

Metal cable gland7

T 8384-0 EN

2021-04-14 · English

Specifications subject to change without notice