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Brand: Samson
Samson TROVIS 3797 PROFINET Smart Valve Positioner
Description
TROVIS 3797 smart positioner with PROFINET over Ethernet-APL
The Samson TROVIS 3797 is an electropneumatic smart positioner that mounts on pneumatic control valves and keeps the valve position in line with the set point sent by the control system. It is the PROFINET generation of the TROVIS family: the set point arrives over Ethernet-APL, the device is powered from the same two-wire connection, and all parameters can be read and changed over PROFINET. Seven Star LLC supplies the TROVIS 3797 in Oman and the GCC as an independent supplier based in Muscat.
Single-acting or double-acting operation is possible, travel from 3.6 to 300 mm and opening angles from 24 to 170 degrees are covered, the device is Ethernet-APL certified and certified according to PA Profile 4, and the unit calibrates itself to the valve and actuator it is mounted on. The 3797 is the choice when a plant is moving its field level to Ethernet and wants valve diagnostics delivered over the same network.
Reading the 3797 article code
The data sheet gives a long article code that begins TROVIS 3797 and then fixes each hardware choice in turn. The important positions are summarised below, using only the options printed in the table.
| Code field | Options listed on the data sheet |
|---|---|
| Explosion protection | 000 without; 110 ATEX II 2G Ex ia IIC T4/T6 Gb; 111 IECEx Ex ia IIC T4/T6 Gb; 112 CCC Ex / NEPSI Ex ia IIC T4/T6 Gb |
| Pneumatics | 01 single/double acting, kVS 0.35; 02 single/double acting, kVS 0.7; 03 single acting, two independent outputs, kVS 0.35; 20 fail-in-place module |
| Option modules | Slots C and D: without/dummy; option module 1 can carry inductive limit switches (NAMUR NC) with a binary output |
| Pressure sensors | Standard set for supply (9), output 138 and output 238 |
| Electrical connection | M20x1.5, one cable gland and three blanking plugs |
| Housing | Aluminium (standard) or stainless steel |
| Special application | Without, or prepared with adapter for VDI/VDE 3847 |
| Display and cover | English and German text as standard; cover without window as a special version |
3797 technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | SAMSON AKTIENGESELLSCHAFT / TROVIS 3797 (PROFINET) |
| Communication | PROFINET over Ethernet-APL; local SSP interface with TROVIS-VIEW (database module 3797) |
| Ethernet-APL layer | 10BASE-T1L to IEEE 802.3cg, 10 Mbit/s, trunk up to 1000 m, spur cable 200 m at the field switch |
| Power | Loop-powered over APL, 2-WISE, APL port profile SLAA, 15 V DC and 0.54 W maximum |
| Travel | 3.6 to 30 mm (direct on Type 3277); 5 to 300 mm (IEC 60534-6 NAMUR and VDI/VDE 3847-1) |
| Rotary angle | 24 to 100° (VDI/VDE 3845 and 3847-2); 170° on request |
| Supply air | 2.5 to 10 bar (30 to 150 psi); ISO 8573-1 quality: particles class 4, oil class 3 |
| Signal pressure | 0 bar up to supply pressure |
| Hysteresis / sensitivity | ≤0.3 % / ≤0.1 %, sensitivity adjustable by software |
| Air output capacity at Δp = 6 bar | Supply 32 m³n/h with one module (60 with two); exhaust 37 m³n/h with one module (70 with two) |
| Air consumption | ≤300 ln/h at 6 bar supply, depending on module |
| Ambient temperature (operation) | –40 to +85 °C with metal cable glands; Ex version –40 to +80 °C |
| Degree of protection | IP66 |
| Cable entries / terminals | Up to four M20x1.5 glands; screw terminals 0.2 to 2.5 mm² |
| Housing | Die-cast aluminium EN AC-44300, chromate and powder coated; window Makrolon 2807 |
| Weight | 1.4 to 1.6 kg depending on version |
How the TROVIS 3797 positions a valve
A non-contact travel sensor reads the valve stem or shaft position, which reaches the sensor through the pick-up lever. A microcontroller runs a PID algorithm that compares this measured position with the set point from the control system. When they differ, the pneumatic module either vents the actuator or fills it with air until the plug or disc reaches the requested position.
The pneumatic side is modular. Up to two pneumatic modules sit in slots A and B, each built around a microcontroller that drives an i/p converter with a downstream spool valve. A dummy module must close the second slot when only one module is installed, and the article codes for the modules are P3799-0000 for the dummy and P3799-0001 for the output 138 and output 238 module. Sealing one of the two outputs gives single-acting operation. Air flow at the outputs can be restricted by software, which helps tune small actuators without fitting external restrictors.
Where the 3797 fits among TROVIS and Type positioners
The 3797 is the PROFINET device in a wider Samson positioner offering that also includes the Ex d TROVIS SAFE 3731-3 for flameproof installations, and the pneumatic Type 3766 and electropneumatic Type 3767. Accessories used in the same loops include the Type 3755 volume booster for large actuators and the Type 3709 lock-up valve for fail-in-place behaviour. Pick the 3797 when the control system speaks PROFINET and APL switches are available; choose a HART device when the loop is still two-wire analogue.
Mounting kits cover direct attachment to the Type 3277 actuator (240 to 750 cm²), NAMUR attachment to the rib or yoke, rotary actuators per VDI/VDE 3845 with lever sizes M, L, XL and XXL, and a VDI/VDE 3847 version that lets the positioner be swapped while the process runs because air is blocked in the actuator.
Selection checklist for the TROVIS 3797
- Control network: confirm the system supports PROFINET over Ethernet-APL and that an APL field switch with a suitable port profile (SLAA) is installed.
- Actuator type: single-acting spring-return, double-acting, or an actuator with a safety function that needs the fail-in-place module.
- Actuator volume and speed: choose kVS 0.35 or 0.7 modules, or two modules, according to stroking time.
- Attachment: direct on Type 3277, NAMUR rib, rod-type yoke to IEC 60534-6-1, VDI/VDE 3845 rotary, or VDI/VDE 3847.
- Hazardous area: select the ATEX, IECEx or CCC/NEPSI code field that matches the zone and local requirement, and check the temperature class limits.
- Environment: aluminium or stainless housing, and whether the cover needs a window for local reading.
- Supply air: 2.5 to 10 bar of clean, dry instrument air meeting ISO 8573-1 classes.
Installation, commissioning and maintenance of the 3797
Mount the positioner on a clean, rigid bracket and set the lever to match the travel or angle, then connect supply air and the output piping. Electrical connection is a two-wire APL cable with reverse polarity protection. Initialisation is started from the rotary pushbutton or from the control system, and four initialisation modes are available. A substitution mode lets the positioner start while the plant runs without moving the valve, which is useful in emergency repair situations.
On site, a single rotary pushbutton and a plain-text display show the NAMUR NE 107 states and the menu, and the reading direction can be turned by 180 degrees. Parameters are held in non-volatile memory. For maintenance, use the EXPERTplus diagnostics, the pressure sensor readings for supply and signal pressure, continuous zero monitoring and the operating-hours counter to schedule work. Keep a spare pneumatic module of the type installed on the shelf for critical valves. The device can also be configured from a laptop over the SSP interface with the TROVIS-VIEW software.
Typical 3797 applications in Oman and the GCC
Positioners with network communication are increasingly specified for new process units in oil and gas processing, power generation, desalination and petrochemical plants in Oman and the wider Gulf. High ambient temperature, dust and humidity make the wide operating range and IP66 protection relevant, while diagnostic messages reduce the need to walk the plant to check control valves. Typical valves include globe, rotary plug and butterfly control valves in cooling water, boiler feed, chemical dosing and utility air services.
Information to send with an RFQ for the 3797
- Full article code or the options required from the table above
- Valve and actuator make, type, size, stroke or rotation angle and fail-safe direction
- Supply air pressure and available air quality
- Control system and APL switch details
- Hazardous area classification and required approvals
- Quantity, housing material and any spare pneumatic modules
Documents and quotation
The Samson datasheet for the TROVIS 3797 is attached on this page, and it includes the full article code, dimensions and approval table. Please confirm the ordering code with your valve supplier or project documents before placing an order.
Send the 3797 article code, valve and actuator details and the hazardous-area requirement to Seven Star LLC, and we will prepare a quotation for Oman and the GCC.
Other Models in the Samson Trovis Positioners Range
Seven Star LLC supplies models from the Samson Trovis Positioners range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| Samson TROVIS 3797 PROFINET Smart Valve Positioner | Valve Positioners | You are viewing this model |
| Samson TROVIS SAFE 3731-3 Ex d HART Valve Positioner | Valve Positioners | View details |
| Samson Type 3724 Electropneumatic Positioner (4-20 mA) | Valve Positioners | View details |
| Samson Type 3766 Pneumatic Valve Positioner (3-15 psi) | Valve Positioners | View details |
Datasheets & Documents
- Datasheet Samson TROVIS 3797 Datasheet Download
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About brand
SAMSON is a German manufacturer of control valves, actuators, positioners and self-operated regulators. Hermann Sandvoss founded the company in Düsseldorf on 1 April 1907, and its first important product was a thermostatic valve that controlled temperature without external power. After moves to Mannheim, SAMSON settled in Frankfurt am Main in 1916, where SAMSON AG is still headquartered.
Seven Star LLC supplies Samson control valves, pneumatic actuators and positioners to process plants in Oman, including the types listed on this page and their replacement units.
Samson company profile
| Founded | 1 April 1907, Düsseldorf, by Hermann Sandvoss, as VULCAN Technische Apparate Baugesellschaft; products sold under the SAMSON name |
|---|---|
| Headquarters | Frankfurt am Main, Germany, since 1916 |
| Legal form | SAMSON AG |
| First product | A self-operated thermostatic valve |
| Group brands | SAMSON together with PFEIFFER, LEUSCH, VETEC and AIR TORQUE |
| Product families | Globe valves such as Type 3241, rotary and butterfly valves, 3271 and 3277 pneumatic actuators, 3730 and 3731 positioners, self-operated pressure and temperature regulators |
Milestones
- 1907: Hermann Sandvoss founds the company in Düsseldorf.
- 1909: It is re-established as SAMSON Apparatebau GmbH.
- 1916: After a period in Mannheim, the company moves to Frankfurt am Main.
- 1975: The name becomes SAMSON Mess- und Regeltechnik.
Samson valve, actuator and positioner types
Samson builds a control valve from modules. The Type 3241 globe valve is the general-service body of Series 240, and the Type 3251 is the Series 250 body for higher pressure ratings. Either one is combined with a Type 3271 pneumatic diaphragm actuator or a Type 3277, whose yoke allows the positioner to be attached directly with a concealed travel linkage.
Among the positioners listed are the Type 3725 and the Type 3730 family: the 3730-1 as the basic electropneumatic version, sold in its current generation as TROVIS 3730-1, and the 3730-3 with HART communication and valve diagnostics. Samson also makes PROFIBUS PA and FOUNDATION fieldbus variants in the same family, plus self-operated pressure and temperature regulators.
Where Samson valves are used
Samson control valves throttle steam, gas and liquids in chemical and petrochemical units, refineries, gas processing, power stations, water and desalination plants, and food production. Many reach site as part of a skid or package, so the plant instrument team often meets them first when a positioner or actuator needs replacing. We supply these items to end users and contractors throughout the GCC.
Samson products we list
Ordering Samson parts: what we need
Every Samson device has a nameplate with the type, a configuration ID (Var-ID) and a serial number. A photo of that plate is the surest route to an exact match. Without it, please send:
- Valve: type, DN or NPS, pressure rating, body and trim material, Kvs or Cv, plug and seat style, packing and bonnet type
- Actuator: type, effective area in cm², bench range, fail action and travel
- Positioner: full type code including Ex protection, communication and options such as limit switches or position transmitter
We check the code against Samson documentation and provide the manufacturer's data sheet on request.
Facts checked against SAMSON's corporate chronicle and press material, October 2026.
Browse Samson products by category: Control Valves, Valve Positioner, Valve Actuator.
FAQ
Questions about the Samson TROVIS 3797 PROFINET Smart Valve Positioner
Answers from our engineering team on installation, compatibility and integration.
01What fieldbus does the TROVIS 3797 use?
The TROVIS 3797 communicates with PROFINET over Ethernet-APL, using 10BASE-T1L at 10 Mbit/s. The same two-wire APL connection also powers the device, so no separate supply is required.
02Is the 3797 single-acting or double-acting?
Both are possible. The configuration depends on which pneumatic modules are fitted. The article code offers single/double acting modules with kVS 0.35 or 0.7, a two-independent single-acting module and a fail-in-place module.
03What travel and angle ranges does the TROVIS 3797 cover?
Adjustable travel is 3.6 to 30 mm for direct attachment to a Type 3277 actuator and 5 to 300 mm for NAMUR or VDI/VDE 3847-1 attachment. Rotary attachment covers 24 to 100 degrees, with 170 degrees on request.
04What ambient temperature range is quoted for the 3797?
Operation is rated from –40 to +85 °C for versions with metal cable glands. The explosion-protected version is limited to –40 to +80 °C and the limits in its test certificate also apply.
05Does the TROVIS 3797 include valve diagnostics?
Yes. EXPERTplus diagnostics for control valves are integrated, together with NAMUR NE 107 status messages, an operating hours counter, a temperature sensor and pressure sensors for supply air and signal pressure.
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