T 8384-6 EN
Type 3730-6 Electropneumatic Positioner
with HART® communication and pressure sensors · Series 3730

Application
Single-acting or double-acting positioner for attachment to pneumatic control valves. Self-calibrating, automatic adaptation
to valve and actuator.
Set point
Valve travel
Opening angle

4 to 20 mA
3.6 to 300 mm
24 to 100°

The positioner ensures a predetermined assignment of thevalve position (controlled variable x) to the input signal (setpoint w). It compares the input signal received from a control
system to the travel or rotational angle of the control valve
and issues a corresponding output signal pressure (output
variable y).

Fig. 1: Type 3730-6, direct
attachment to Type 3277
Pneumatic Actuator (new design)

Special features•

Simple attachment to all common linear and rotaryactuators– SAMSON direct attachment (Fig. 1)– NAMUR rib (Fig. 2)– Attachment to rod-type yokes according toIEC 60534-6-1– Attachment according to VDI/VDE 3847
– Rotary actuator attachment according to VDI/
VDE 3845 (Fig. 3)

Fig. 2: Type 3730-6
Attachment according to
VDI/VDE 3845

• Any desired mounting position of the positioner (but notsuspended)

Fig. 3: Type 3730-6
Attachment according to
NAMUR• Simple one-knob, menu-driven operation• LCD easy to read in any mounting position thanks to
selectable reading direction• Configurable with a computer over the SSP interface using
the TROVIS-VIEW software• Variable, automatic start-up with four different initialization modes• Preset parameters - only values deviating from thestandard need to be adjusted• Calibrated travel sensor without gears susceptible to wear

Fig. 4: Type 3730-6
External position sensor with Type 3510 Micro-ﬂow Valve• Sub (substitution) initialization mode allows the positioner
to be started up in case of emergency whilst the plant isrunning without having to change the valve position.

• Adjustable tight-closing function• All parameters saved in non-volatile EEPROM• Two programmable position alarms as standard• Two-wire system with a small electrical load of 460 Ω• Adjustable output pressure limitation• Continuous zero monitoring• Integrated temperature sensor and operating hours counter• Self-diagnostics; messages as condensed state conforming
to NAMUR Recommendation NE 107, issued over a fault
alarm contact or optional analog position transmitter

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• Integrated EXPERTplus diagnostics for control valves(u T 8389-1)

The positioner is mounted on pneumatic control valves andused 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 or rotational
angle of the control valve and issues a signal pressure (output
variable y) for the pneumatic actuator.

• Pressure sensors to monitor the supply air and signal
pressure
Version––Type 3730-6 · Electropneumatic positioner for control
valves, HART® communication, on-site operation, local
communication with SSP interface, EXPERTplus diagnostics, pressure sensors to monitor the supply air and signal
pressure

The positioner mainly consists of an electric travel sensor system (2), an analog i/p module with a downstream air booster
and the electronics with the microcontroller (5).
When a set point deviation occurs, the actuator is either vented or filled with air. If necessary, the signal pressure change
can be slowed down with a volume restriction that can beconnected as necessary. The signal pressure to the actuatorcan be limited by software to 1.4, 2.4 or 3.7 bar.

Type 3730-3 · Electropneumatic positioner same as
Type 3730-6, without pressure sensors (see u T 8384-3)

Additional options–

Inductive limit switch with proximity switches–

Analog position transmitter with two-wire transmitter–

Electronically activated forced venting function–

Solenoid valve with parallel forced venting–

Binary input–

External position sensor (Fig. 4)–

Stainless steel housing–

Leakage sensor to monitor the seat leakage

A constant air stream with a fixed set point to the atmosphereis created by flow regulator (9) with a fixed set point. The i/p
module (6) is supplied with a constant upstream pressure by
the pressure reducer (8) to make it independent of the supply
air pressure.

22
Serial20
Interface

16

S %

mm

21 FSK

13

mm

%

BE

A3

15
w

4

5

19

A2

14

x1)

A1

14
&

>12 V

w

24 V DC
17

x

18

12

PD

G

25

6

11

2

3
G

9
8
23

10
7

Q

24
y

1
x

1
2
3
4
5
6
7
8
9
10
11
12
13

Control valve
Travel sensor
PD controller
A/D converter
Microcontroller
i/p converter
Air booster
Pressure reducer
Flow regulator
Volume restriction
Inductive limit switch (option)
Solenoid valve (option)
Analog position transmitter or binary
input (optional)

14
15
16
17
19
20
21
22
23
24
25

Software limit switches A1/A2
Fault alarm output A3
Display
Actuation of solenoid valve (optional)
D/A converter
Communication interface
HART® connection
Binary input BE (option)
Pressure sensor for supply air ps
Pressure sensor for signal pressure pout
Forced venting (optional)

Fig. 5: Functional diagram of Type 3730-6 Positioner

2

T 8384-6 ENTable 1: Technical data
Type 3730-6 Positioner (technical data in test certificates additionally apply to explosion-protected devices)

Valve travel

Travel range
Set point w

Adjustable

Direct attachment to Type 3277 Actuator

3.6 to 30 mm

Attachment according to IEC 60534-6(NAMUR)

3.6 to 300 mm

Attachment according to VDI/VDE 3847

3.6 to 300 mm

Attachment to rotary actuators (VDI/
VDE 3845)

24 to 100° opening angle

Adjustable

Adjustable within the initialized travel/angle of rotation of the valve; travel can be restricted to 1/5 atthe maximum.

Signal range

4 to 20 mA · Two-wire device, reverse polarity protection · Minimum span 4 mA

Static destruction limit

30 V

Minimum current

3.6 mA for display · Emergency venting at ≤3.8 mA or ≤4.4 mA depending on version

Load impedance≤9.2 V (corresponding to 460 Ω at 20 mA)

SupplySupply air

1.4 to 7 bar (20 to 105 psi)

Air quality acc. toISO 8573-1 (edition
2001-02)

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

Signal pressure (output)

Characteristic

0 bar up to the supply pressure · Can be limited between 1.4 and 7.0 bar by software

Adjustable

Linear/Equal percentage/Reverse equal percentage
User-defined (over operator software)
Butterfly valve, rotary plug valve and segmented ball valve: Linear/equal percentage

Deviation≤1 %Hysteresis≤0.3 %

Sensitivity≤0.1 %

Transit time

Exhaust and supply adjustable separately up to 240 s by software

Direction of action

Reversible

Air consumption, steady state

Independent of supply air approx. 110 ln/h

Air output capacity

Actuator (supply)
Actuator (exhaust)

Permissible ambient temperature

Influences

At Δp = 6 bar: 8.5 mn³/h · At Δp = 1.4 bar: 3.0 mn³/h · KVmax(20 °C) = 0.09
At Δp = 6 bar: 14.0 mn³/h · At Δp = 1.4 bar: 4.5 mn³/h · KVmax (20 °C) = 0.15
–20 to +80 °C (all versions)–45 to +80 °C with metal cable gland
The limits in the type examination certificate additionally apply to explosion-protected versions.

Temperature≤0.15 %/10 K

Supply air

None

Effect 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 M20x1.5 cable gland for 6 to 12 mm clamping range · Second M20x1.5 threaded connection
additionally exists · Screw terminals for 0.2 to 2.5 mm² wire cross-sections

Degree of protection

IP 66/NEMA 4X

Certified according to IEC 61508/SIL

Suitable for use in safety-instrumented systems up to SIL 2 (single device/HFT = 0) and SIL 3 (redundantconfiguration/HFT = 1) according to IEC 61511.
•
Triggered by the set point, emergency venting depending on positioner version at ≤3.8 mA or≤4.4 mA•
By the optional solenoid valve, emergency venting at 0 V•
By the optional forced venting function, emergency venting at <12 V

Communication (local)

SAMSON SSP interface and serial interface adapter, software requirements (SSP): TROVIS-VIEW with
database module 3730-6

Communication (HART®)

HART® field communication protocol
Impedance in HART® frequency range: Receiving 350 to 450 Ω · Sending approx. 115 Ω

Softwarerequirements(HART®)
Conformity

T 8384-6 EN

For handheld
communicator
For computer

Device description for Type 3730-6
DTM file according to specification 1.2, suitable for integrating the device into frame applications that
support the use of FDT/DTM (e.g. PACTware)·3

Explosion protection
ATEX, IECEx, ...

See table for explosion protection certificates

Binary contacts
Two software limit switches, reverse polarity protection, floating, configurable switching characteristics (default settings in table below)
Signal state

No response≤1.0 mA

Response≥2.2 mA

One fault alarm contact, floating
Signal state

No response/no fault≥2.2 mA

Response/fault alarm≤1.0 mA

For connection to

NAMUR switching amplifier acc. to EN 60947-5-6

Materials
Housing

Die-cast aluminum EN AC-AlSi12(Fe) (EN AC-44300) acc. to DIN EN 1706, chromate and powder
coating · Special version: stainless steel 1.4408

External parts

Stainless steel 1.4404/316L

Cable gland

M20x1.5, black polyamide

WeightApprox. 1.0 kg · Stainless steel version: 2.2 kg

Table 2: Options for Type 3730-6 Positioner
Electronic forced venting · Approval acc. to IEC 61508/SIL
24 V DC · Electrical isolation and reverse polarity protection · Static destruction limit 40 V
Input

Power draw:I =U – 5.7 V
3.84 kΩSignal '0' (no response)<12 V (emergency venting at 12 V)

Signal '1' (response)> 19 V(corresponding to 4.8 mA at 24 V/114 mW)

Solenoid valve · Approval acc. to IEC 61508/SIL
24 V DC · Reverse polarity protection · Static destruction limit 40 V
Input

Power draw:I =U – 5.7 V
3.84 kΩ(corresponding to 4.8 mA at 24 V/114 mW)

Signal '0' (no response)<12 V (emergency venting at 0 V)

Signal '1' (response)> 19 V

Service life

> 5 x 106 switching cycles

Analog position transmitterTwo-wire transmitter · Galvanically isolated

Power supply

12 to 30 V DC · Reverse polarity protection · Static destruction limit 40 V

Output signal

4 to 20 mA

Operating direction

Reversible

Operating range–10 to +114 %Characteristic

LinearHysteresis

Same as positioner

High-frequency influence

Same as positioner

Other influences

Same as positioner

Fault alarm

Can be issued as current signal 2.4 ±0.1 mA or 21.6 ±0.1 mALeakage sensor · Suitable for operation in hazardous areas
Temperature range–40 to +130 °C

Tightening torque

20 ±5 Nm

Inductive limit switch by Pepperl+Fuchs

For connection to switching amplifier acc. to EN 60947-5-6,
Can be used in combination with a software limit switch.

SJ2-SN proximity switch

Measuring plate not detected: ≥3 mA · Measuring plate detected: ≤1 mA

4

T 8384-6 EN

External position sensor
Valve travel

Same as positioner

Cable

10 m · Flexible and durable · With M12x1 connector · Flame-retardant according to VDE 0472 ·Resistant to oils, lubricants and coolants as well as other aggressive media

Permissible ambient temperature–40 to +90 °C with a fixed connection between positioner and position sensor · The limits in the test
certificate additionally apply for explosion-protected versions.

Immunity to vibration

Up to 10 g in the range of 10 to 2000 Hz

Degree of protection

IP 67

Binary input · Galvanic isolation · Switching behavior configured by software
Active switching behavior (default setting)Port

For external switch (floating contact) or relay contact

Electric data

Open-circuit voltage when contact is open: max. 10 V
Pulsed DC current reaching peak value of 100 mA and RMS value of 0.01 mA when contact is closed

Contact

Closed, R < 20 Ω ON switching state (default setting)Open, R > 400 Ω OFF switching state (default setting)

Passive switching behavior
Port

For externally applied DC voltage, reverse polarity protection

Electric data

3 to 30 V · Static destruction limit 40 V · Current consumption at 24 V: 3.7 mA

Voltage

T 8384-6 EN>6 V

ON switching state (default setting)<1 V

OFF switching state (default setting)5Summary of explosion protection certificates for Type 3730-6 Positioner
Typ 3730-6

Certification

-110
-210
ATEX
-510
-810

-131

CSA

-112
CCC Ex
-512

-130

-211
IECEx
-511

-811

-116

-816

6

PTB 10 ATEX 2007

Date

2020-01-20

NumberPTB 10 ATEX 2007

Date

2020-01-20

NumberPTB 10 ATEX 2007

Date

2020-01-20

NumberPTB 10 ATEX 2008X

Date

2010-08-18

Number2682094Date

2017-05-24

Number2020322307003192

Date

2023-04-29

Valid until

2025-11-08

Number2020322307003192

Date

2023-04-29

Valid until

2025-11-08

Number3012394Date

2014-11-05

NumberIECEx PTB 10.0057

Date2020-09-17

NumberIECEx PTB 10.0057

Date2020-09-17

NumberIECEx PTB 10.0057

Date2020-09-17

NumberIECEx PTB 10.0058X

Date

2010-12-10

Number

ZETC/35/2021

Date

2021-07-26

Valid until

2024-07-25

FM

-111

-516

Type of protection
NumberTR CMU 1055

Number

ZETC/35/2021

Date

2021-07-26

Valid until

2024-07-25

Number

ZETC/35/2021

Date

2021-07-26

Valid until

2024-07-25

II 2 G Ex ia IIC T6 Gb
II 2 D Ex ia IIIC T80 °C Db
II 2 G Ex d[ia] IIC T6 Gb
II 2 D Ex tb IIIC T80 °C Db
II 2 D Ex tb IIIC T80 °C Db
II 3 G Ex nA ic IIC T6 Gc
II 3 D Ex tc IIIC T80°C Dc IP66
Ex ia IIC T4/T5/T6; Class I, Zone 0
Class I, Groups A,B,C,and D
Class II Groups E,F and G;Class III; Type 4 Enclosure
Ex ia IIC T4...T6 Gb
Ex ia IIIC T80°C Db

Ex tb IIIC T80°C Db

Intrinsically safe:
IS, Class I, II, III, Div. 1, Gr. A, B, C, D, E, F, G
AEx ia IIC / Class I / Zone 0
Non incendive:
NI, Class I, Div. 2, Gr. A, B, C, D
S, Class II, Div. 2, Gr. F, G
Enclosure Type 4X
Ex ia IIIC T80 °C Db
Ex ia IIC T6 Gb
Ex db[ia] IIC T6 Gb
Ex tb IIIC T80 °C Db
Ex tb lllC T80°C Db

Ex nA IIC T6
Ex nL IIC T6
Ex tD A22 IP 66 T80 °C
II 2G Ex ia IIC T6 Gb
II 2D Ex ia IIIC T80 °C Db

II 2D Ex tb IIIC T80°C Db

II 3G Ex nA IIC T6 Gc
II 3D Ex tc IIIC T80°C Dc

T 8384-6 EN

Operation

Mounting the positioner

The positioner is operated with a user-friendly rotary pushbutton. The parameters are selected by turning the knob, pushingit activates the required setting. In the menu, all parameters
are listed in one level, eliminating the need to search in submenus. All parameters can be checked and changed on site.

The Type 3730 Electropneumatic Positioner can be attacheddirectly to the Type 3277 Actuator (175 to 750 cm²) over aconnection block. In actuators with “actuator stem extends”
fail-safe action, the signal pressure is routed over an internal
hole in the actuator yoke to the actuator. In actuators with “actuator stem retracts” fail-safe action, the signal pressure isrouted to the actuator over ready-made external piping.

All values are displayed on the LCD. The reading direction of
the LCD can be rotated by 180°.
The closing direction of the control valve is indicated to thepositioner by setting the slide switch "Air to open/Air toclose". It assigns the CLOSED position of the control valve tothe 0 % reading.
The INIT key activates initialization which is started according
to the ready adjusted parameters (autotune). After initialization is completed, the positioner immediately starts closedloop operation.
To configure the positioner with SAMSON’s TROVIS-VIEW
software, the positioner is equipped with an additional digitalinterface to be connected to the RS-232 or USB interface of acomputer.
Additionally, all parameters of the Type 3730-6 Positioner
can be accessed using HART® communication.

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 pair of universal brackets is used for the attachment toType 3278 Rotary Actuators or other rotary actuators according to VDI/VDE 3845. The rotary motion of the actuator istransferred to the positioner over a coupling wheel with travelindication.
A special version of the positioner allows it to be attached according to VDI/VDE 3847. This type of attachment allows the
positioner 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 to
the NAMUR rib of a control valve using an additional
NAMUR connection block.
A reversing amplifier is necessary for double-acting, springless actuators for the second opposing signal pressure.

210

Dimensions in mm

80

M 20x1.5

40

28

58
Output (38)Supply (9)

86

164

14

34

Direct attachment

T 8384-6 EN

7Pressure gauge
bracketG ¼ or ¼ NPT

or connecting plate

NAMUR attachment
70

58
15
Lever

46

34

200

164

164

Attachment according
to VDI/VDE 3847

13

164

Lever

62

24

62

Attachment to SAMSONType 3277

38

Attachment to NAMUR rib

28

Schild70

External position sensor

70

8

T 8384-6 EN

Attachment to rotary actuators
VDI/VDE 3845 (Sept. 2010)
Fixing level 1
Size AA1 to AA4

Light version

Output Y1
Output Y1

Supply (9)

79
59
49

80

52

Connecting plate
G ¼ or ¼ NPT

58
Output Y2

80

50

Output Y2

Type 3710 Reversing
Amplifier (optional)

130
150

90

Mounting kit
CrNiMo steel bracket

164

Heavy-duty version

Output Y1
Output Y1

Supply (9)

80

52

86

56

Connecting plate
G ¼ or ¼ NPT

Output Y2 Type 3710

80
130
166

30
86
Ø 101

Reversing
Amplifier(optional)

Output Y2

Lever
Lever

x

y

z

S

17 mm

25 mm

33 mm

M

25 mm

50 mm

66 mm

L

70 mm

100 mm

116 mm

XL

100 mm

200 mm

216 mm

T 8384-6 EN

z
y
x

16
10...179

Ordering text
Type 3730-6... Positioner–

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 (175 to 750 cm²)–

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

Attachment acc. to VDI/VDE 3847
Valve travel: ... mm, if applicable, stem diameter: ... mm–

Attachment to Type 3278 Rotary Actuator (160/320 cm²),
mounting kit with CrNiMo steel bracket or heavy-duty
attachment–

Attachment to rotary actuators acc. to VDI/VDE 3845,
mounting kit with CrNiMo steel bracket or heavy-duty
attachment–

Pneumatic reversing amplifier for double-acting actuatorswith connection acc. to ISO 228/1-G ¼ or ¼-18 NPT–

Adapter M20x1.5 to ½ NPT–

Metal cable gland–Special version: housing made of CrNiMo steel

10

T 8384-6 EN

Article code
Positioner

Type 3730-6 x

x

x

x

x

x

x

0

x

x

0

x

0

0

with HART® communication and pressure sensors
Explosion protection
Without

0

0

0

ATEX

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

1

1

0

IECEx

Ex ia IIIC T80 °C Db; Ex ia IIC T6 Gb

1

1

1

CCC ExEx ia IIC T4...T6 Gb; Ex ia IIIC T80°C Db

TR CMU 1055 II 2G Ex ia IIC T6 Gb; II 2D Ex ia IIIC T80°C Db

1

1

6

FM

Intrinsically safe:
IS / Class I,II,III / Div. 1 / Gr. ABCDEFG;
AEx ia IIC / Class I / Zone 0
Non Incendive: NI / Class I / Div. 2 / Gr. ABCD;
S / Class II / Div. 2 / Gr. FG; Enclosure Type 4X

1

3

0

CSA

Ex ia IIC T4/T5/T6; Class I, Zone 0;
Class I, Groups A,B,C,and D;Class II Groups E,F and G;Class III; Type 4 Enclosure

1

3

1

ATEX

II 2 G Ex d[ia] IIC T6 Gb; II 2 D Ex tb IIIC T80 °C
Db

2

1

0

IECEx

Ex db[ia] IIC T6 Gb; Ex tb IIIC T80 °C Db

2

1

1

ATEX

II 2 D Ex tb IIIC T80 °C Db

5

1

0

IECEx

Ex tb lllC T80°C Db

5

1

1

CCC Ex

Ex tb IIIC T80°C Db

TR CMU 1055 II 2D Ex tb IIIC T80°C Db

5

1

6

ATEX

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

8

1

0

IECEx

Ex nA IIC T6; Ex nL IIC T6; Ex tD A22 IP66 T80
°C

8

1

1

TR CMU 1055 II 3G Ex nA IIC T6 Gc; II 3D Ex tc IIIC T80°C Dc

8

1

6

NEPSI

Ex ic IIC T4~T6 Gc; Ex nA IIC T4~T6 Gc;
Ex tD A22 IP66 T80°C

8

1

2

GOST (EAC)

2Ex nA IIC T6...T4 Gc X; 2Ex ic IIC T6...T4 Gc X;
Ex tc IIIC T80°C Dc X

8

1

3

TR CMU 1055 II 3G Ex nA IIC T6 Gc; II 3D Ex tc IIIC T80°C Dc

8

1

6

Option (additional equipment)
Inductive limit switch
Without

0

SJ2-SN (NC contact)

10

Venting function
Without

0

Solenoid valve, 24 V DC

1Forced venting, 24 V DC

2

Additional equipment
Without

0

Position transmitter

10

Leakage sensor (including cable and fixing screw)

20

Binary input

30External position sensor
Without0With, including 10 m connecting cable1

Prepared for connection, without sensor

2

1

FunctionStandard (control valves)

0Emergency shutdown
3.8 mA0

4.4 mA

1

T 8384-6 EN

11

Positioner

Type 3730-6 x

x

x

x

x

x

x

0

x

x

0

x

0

0

Housing material
Aluminum (standard)

1

Stainless steel

2

Without0

Device compatible with paint1

Exhaust air port with ¼-18 NPT thread, back of positioner sealed

2With additional vent hole and VDI/VDE 3847 adapter; without travel pick-off parts

6

With additional vent hole

7

Specifications subject to change without notice

T 8384-6 EN

2024-03-14 · English

Special applications