T 8497 EN
TROVIS 3797 Smart Positioner (PROFINET®)

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

3.6 to 300 mm
24 to 170°

The positioner ensures a predetermined assignment of thevalve position to the input signal. It compares the input signal
received from a control system to the travel or rotational angleof the control valve and issues a corresponding output signal
pressure (output variable).
Special features• High air capacity• Modular design: easy retrofitting or exchange of pneumatic or option modules• Simple attachment to all common linear and rotary actuators:–––––• Adjustable tight-closing function• Continuous zero monitoring• Integrated temperature sensor and operating hours counter• Self-diagnostics, messages as condensed state conforming
to NAMUR Recommendation NE 107• Integrated EXPERTplus diagnostics for control valves(u T 8389-4)• Pressure sensors to monitor the supply air and signal pressure• Air capacity adjustable by software

SAMSON direct attachment
NAMUR ribAttachment to rod-type yokes according toIEC 60534-6-1
Attachment according to VDI/VDE 3847
Rotary actuator attachment according to VDI/VDE 3845

• Non-contact position sensing• Plain-text display with NAMUR Recommendation NE 107
states and messages on the device• Integrated diagnostic functions• Simple one-knob, menu-driven operation• LCD easy to read in any mounting position thanks toselectable reading direction• Configurable with a computer over the SSP interface using
the TROVIS-VIEW software• Variable, automatic start-up with four different initialization modes• 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.
• All parameters saved in non-volatile EEPROM• Two-wire system with a small electrical load of 495 ΩFig. 1: TROVIS 3797 Electropneumatic 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 February 2023

Design and principle of operation

pneumatic module (A, B) causes the actuator (1) to be either
vented or supplied with air. As a result, the closure member ofthe valve (e.g. plug) is moved to the position determined by
the set point.

The TROVIS 3797 Electropneumatic Positioner is mounted onpneumatic control valves and used to assign the valve position(controlled variable x) to the control signal (set point w). The
positioner compares the electric control signal issued by acontrol system using PROFINET over APL to the travel or
opening angle of the control valve and issues a signalpressure for the pneumatic actuator. The positioner mainly
consists of a non-contact travel sensor system (2), pneumatics
and the electronics with the microcontroller (4). The output of
the standard version is either single or double acting; whichmeans both the Output 138 and Output 238 can provide theoutput variable and route the signal pressure to the actuator.

The pneumatic module is supplied with air. The flow rate of
the module's output can be restricted by software.
The positioner is operated by a rotary pushbutton (8) for
menu navigation on the plain-text display (7).
The extended EXPERTplus diagnostics are integrated into thepositioner. They provide information on the control valve andpositioner and generate diagnostic and status messages,
which allow faults to be pinpointed quickly.

The positioner can be configured to meet requirements of anapplication by adding a maximum of two pneumatic modules(A, B). The pneumatic modules mainly consist of a microcontroller, which operates an i/p converter with downstream
spool valve. Depending on the actuator used, an output of thepositioner can be sealed to achieve a single-acting function.
The valve position is transmitted either as an angle of rotation
or linear travel to the pick-up lever, from there to the travelsensor (2) and forwarded to the microcontroller (4). The PID
algorithm in the microcontroller compares the valve position
measured by the travel sensor (2) to the control signal issued
by the control system. In case of a set point deviation, theSerial 5Interface

76

#3w

µC

PROFINET
over APL&AB

21234567Control valve
Travel sensor
Microcontroller
Pressure sensors
Communication interfaceDisplay
Rotary pushbutton

AB

Slot for pneumatic module A
Slot for pneumatic module B

p/#
p/#
p/#

Exh1x

Exhaust 79

Output 238

Output 138

Supply 9y4

Fig. 2: Block diagram of TROVIS 3797 Positioner

2T 8497 EN

Technical data · TROVIS 3797 Positioner
TravelAdjustable travel for

Direct attachment to Type 3277:
Attachment according to IEC 60534-6 (NAMUR):
Attachment according to VDI/VDE 3847-1
Attachment according to VDI/VDE 3845 andVDI/VDE 3847-2:

3.6 to 30 mm
5 to 300 mm
5 to 300 mm
24 to 100° (170° 1))

Ethernet APL
Standard

10BASE-T1L according to IEEE 802.3cg

Transmission rate

10 Mbit/s

Max. connection length

1000 m · Connection at the field switch: spur cable 200 m

Max. power supply values

17.5 V · 380 mA · 5.32 W

Connection

Two-wire, reverse polarity protection
2-WISE according to EN 60079-11 and TS IEC 60079-47

Communication

PROFINET over Ethernet APL

Local

SAMSON SSP interface and serial interface adapter or SSP over APL(software requirements: TROVIS-VIEW with database module 3797)

Supply air
Supply air

2.5 to 10 bar/30 to 150 psiAir quality acc. to ISO 8573-1

Max. particle size and density:
Oil content:
Pressure dew point:

Signal pressure (output)

0 bar up to supply pressure

Hysteresis≤0.3 %

Sensitivity≤0.1 %, adjustable by software

Start-up time

After interrupted operation < 300 ms: 100 ms
After interrupted operation > 300 ms: ≤2 s

Transit time

Up to 10000 s separately adjustable for exhaust and supply by software

Class 4Class 3
Class 3 or at least 10 K below the lowest
ambient temperature to be expected

Direction of action

Reversible

Air consumption≤300 ln/h with 6 bar supply pressure, depending on module2)

Air output capacity (when ∆p = 6 bar)
Actuator (supply)

32 mn³/h with one pneumatic module (KV max (20 °C) = 0.34)
60 mn³/h with two pneumatic modules of the same sort (KV max (20 °C) = 0.64)

Actuator (exhaust)

37 mn³/h with one pneumatic module (KV max (20 °C) = 0.40)
70 mn³/h with two pneumatic modules of the same sort (KV max (20 °C) = 0.75)

Environmental conditions and permissible temperatures
Permissible environmental conditions according to EN 60721-3Storage

1K6 (relative humidity ≤95 %)Transport

2K44K4Operation–40 to +85 °C (versions with metal cable glands)
Ex version: –40 to 80 °C (with metal cable gland). The limits in the test certificate additionally apply.

Resistance to vibration
Vibrations (sinusoidal)

According to DIN EN 60068-2-6:
0.15 mm, 10 to 60 Hz; 20 m/s², 60 to 500 Hz per axis
0.75 mm, 10 to 60 Hz; 100 m/s², 60 to 500 Hz per axis

Bumps (half sine)

According to DIN EN 60068-2-29:
150 m/s², 6 ms; 4000 bumps per axis

NoiseAccording to DIN EN 60068-2-64:
10 to 200 Hz: 1 (m/s²)²/Hz
200 to 500 Hz: 0.3 (m/s²)²/Hz
4 h/axis

Recommended continuous duty

≤20 m/s²

T 8497 EN3

Influences
Temperature≤0.15 %/10 K

Supply air

NoneRequirements
EMC

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

Degree of protection

IP 66

Conformity
Electrical connections
Cable glands

Max. four, M20x1.5

Terminals

Screw terminals for 0.2 to 2.5 mm² wire cross-section

Explosion protection
Refer to Table 3
Materials
Housing and coverDie-cast aluminum EN AC-AlSi12 (Fe) (EN AC-44300) acc. to DIN EN 1706, chromate and powder
coatingWindowMakrolon® 2807

Cable glands

Nickel-plated brass, stainless steel 1.4305

Other external parts

Stainless steel 1.4571 and 1.4404 (316 L)

Weight
1.4 to 1.6 kg (depending on version)
1)
2)

On request
Based on temperature range –40 to +80 °C

Table 1: Pressure sensors
Pressure sensors
Pressure range

0 to 10 bar

Table 2: Summary of explosion protection certificates for TROVIS 3797 Positioner
TROVIS 3797

Certification-110

ATEX-111IECEx4

Type of protection
NumberDateNumberDate

II 2G Ex ia IIC T4 Gb
Ex ia IIC T4 Gb

T 8497 ENMounting the positioner
The positioner can be attached directly to the Type 3277
Actuator (240 to 750 cm²) over a connection block. Inactuators with “actuator stem extends” fail-safe action, thesignal pressure is routed over an internal hole in the actuatoryoke to the actuator. In actuators with “actuator stem retracts”
fail-safe action, the signal pressure is routed to the actuator
over ready-made external piping.
Using the appropriate bracket, the positioner can also beattached according to IEC 60534-6-1 (NAMUR
recommendation). The positioner can be mounted on eitherside 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 attachedaccording to VDI/VDE 3847. This type of attachment allows
the positioner to be replaced quickly while the process isrunning by blocking the air in the actuator. The positioner canbe attached directly to the Type 3277 Actuator using anadapter bracket or adapter block. Alternatively, it can beattached to the NAMUR rib of a control valve using anadditional NAMUR connection block.
VersionThe TROVIS 3797 Electropneumatic Positioner can be used asa single or double-acting positioner, depending on the combination of the available pneumatic modules.
–Fig. 3: Pneumatic module–+Fig. 4: Port for Ethernet-APL connection

TROVIS 3797 · Electropneumatic positioner for controlvalves, PROFINET® communication, on-site operation,
local communication with SSP interface, EXPERTplus
diagnostics, pressure sensors to monitor the supply air andsignal pressure

Table 3: Available pneumatic modules
Article code

Function

P3799-0000

Dummy module (seals the slot connections andmust be used when only one pneumatic module isinstalled)

P3799-0001

Output 138 and Output 238 module (single anddouble acting)Electrical connection
The positioner is powered over the Ethernet-APL connection(see Fig. 4 ). No other current or voltage source is required.

T 8497 EN

5Operation
The positioner is operated using one proven, user-friendly rotary pushbutton: the various menu levels, parameters and values are selected by turning the button. By pressing the button,
the required setting is activated. All parameters can bechecked and changed on site.
All values are displayed on the plain-text display. The reading
direction of the display can be rotated by 180°.

The initialization key activates initialization which is started
according to the ready adjusted parameters (autotune). Afterinitialization is completed, the positioner immediately starts
closed-loop operation.
To configure the positioner with SAMSON’s TROVIS-VIEW
software, the positioner is equipped with an additional digitalinterface to be connected to the USB interface of a computer
using an adapter.
Additionally, all parameters of the TROVIS 3797 Positioner
can be accessed using PROFINET® communication.

142444102277

Dimensions in mm

58402887

10...1716212

Attachment according to IEC 60534-6 (NAMUR)

70

Pressure gauge bracket

154658346T 8497 EN136224278

211

Attachment according to VDI/VDE 3847 onto Type 3277 Actuator164136238278

211

Attachment according to VDI/
VDE 3847 to a NAMUR rib

164

T 8497 EN78656

Attachment to rotary actuators according to VDI/VDE 3845
Fixing level 1, AA1 to AA4 size

803086130

Ø101

166

Leverzyx

Leverx

yz

M

25 mm

50 mm

66 mm

L70 mm

100 mm

116 mm

XL

100 mm

200 mm

216 mm

XXL

200 mm

300 mm

316 mmFixing levels according to VDI/VDE 3845 (September 2010)
Mmin
Fixing level 2 (bracket surface)

25M6C

Fixing level 1 (actuator surface)
Actuator

Dimensions in mmØdBØDA1)

8SizeABCØdMminD1)

AA050

2515

5.5 for M56650

AA180

3020

5.5 for M59650

AA2803030

5.5 for M59650

AA31303030

5.5 for M514650

AA41303050

5.5 for M514650

AA520050

80

6.5 for M622050

Flange type F05 acc. to DIN EN ISO 5211

T 8497 EN

Pressure gauge bracket, twopressure gauges

46

Pressure gauge bracket, threepressure gauges

100

72

46

Connecting plate

15T 8497 EN9Article code
Positioner

TROVIS 3797- x x x 0 x x 0 0 0 0 2 1 0 0 0 1 0 x 0 0 0 0 9 9 9 9With LCD, autotune, PROFINET communication®

Explosion protection
Without

0 0 0

ATEX II 2G Ex ia IIC T4 G

1 1 0IECEx Ex ia IIC T4 Gb

1 1 1Pneumatics
Single/double acting, kVS 0.35

0 1Single/double acting, kVS 0.7

0 2

Single acting, 2x independent, kVS 0.35

0 3Pressure sensors
Standard (Supply 9, Output 138, Output 238)

2

Electrical connection
M20x1.5 (1x cable gland, 3x blanking plugs)

1Housing material
Aluminum (standard)

0Special applications
Without0Additional certification
Without0

Permissible ambient temperature–40 to +85 °C (with metal cable gland) 1)

1

Display text in different languages
Standard (English, German, French)

0Special version
Without0

Hardware version
1.00.00

0

9 9

1.00.010

9 80

9 8 9 9Firmware version
1.00.xx
A different temperature applies to the explosion-protected version: –40 to +80 °C

Specifications subject to change without notice

T 8497 EN

2023-06-20 · English1)