Samson Original Actuator and Positioner 3372 3725 With I/P Converter Stocks Available
The Samson Type 3372 Electropneumatic Actuator paired with the Type 3725 Digital Positioner is an integrated linear valve automation solution manufactured by Samson AG.
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Product Overview
The Samson Type 3372 Electropneumatic Actuator paired with the Type 3725 Digital Positioner is an integrated linear valve automation solution manufactured by Samson AG. Designed specifically for direct attachment to Samson Type 3241 and Type 3251 series globe control valves, this assembly combines a rolling diaphragm pneumatic actuator with an intelligent, microprocessor-controlled electro-pneumatic positioner. It delivers high-accuracy linear travel modulation from standard 4 to 20 mA analog control signals, ensuring responsive flow control across industrial process piping.
Built with an internal air conduit that routes operating air directly from the positioner to the actuator diaphragm, this unit eliminates external tubing, reducing leak paths and vulnerability to mechanical damage. The Type 3725 positioner incorporates an electronic I/P converter, a high-contrast LCD display, and simple push-button auto-tuning routines for rapid field commissioning. Featuring a rugged polyketone or aluminium protective enclosure, the 3372 and 3725 combination provides dependable operation, low air consumption, and high resistance to vibration across food and beverage lines, chemical processing, pharmaceutical utilities, and general factory automation systems.
Technical Specifications
| Specification | Value |
| Product Name | Electropneumatic Actuator with Digital Positioner |
| Manufacturer / Brand | Samson AG |
| Model Combination | Type 3372 Actuator / Type 3725 Positioner |
| Device Type | Linear Pneumatic Actuator with Integrated Digital I/P Positioner |
| Actuator Effective Diaphragm Area | 120 cm² / 240 cm² Options |
| Rated Valve Travel | Up to 15 mm (30 mm option) |
| Input Control Signal | 4 to 20 mA Two-Wire Analog Loop |
| Internal Converter | Integrated Solid-State I/P Converter Module |
| Fail-Safe Mode | Actuator Stem Extends / Actuator Stem Retracts (Spring-Return) |
| Supply Air Pressure | 2.1 to 6.0 bar (30 to 90 psi) |
| Air Delivery Routing | Direct Internal Air Ducting (Tubing-Free Integration) |
| Air Consumption | Less than 0.1 Nm³/h in Steady State |
| Housing Material | UV-Resistant Polyketone / Die-Cast Aluminium |
| Ingress Protection Rating | IP66 / NEMA 4X |
| Electrical Connection | M20 × 1.5 Cable Gland / Screw Terminals |
| Pneumatic Supply Connection | G 1/4 or 1/4 Inch NPT Female |
| Operating Temperature Range | -20°C to +80°C (-4°F to +176°F) |
| Display and Interface | Digital LCD Display with Local Push-Button Setup |
| Target Valve Compatibility | Samson Type 3241, 3251, 3321 Linear Globe Valves |
| Condition | New |
| Warranty | 1 Year |
Key Features
Integrated direct mounting design eliminates external pneumatic piping and vibration fatigue
Microprocessor-controlled Type 3725 digital positioner ensures high positioning accuracy
Built-in solid-state I/P converter accepts standard 4 to 20 mA analog process signals
High-contrast LCD display with simple push-button navigation for fast auto-calibration
Fail-safe spring return design automatically drives the valve stem to closed or open position
Low quiescent air consumption minimizes continuous utility costs across plant facilities
Rugged IP66 and NEMA 4X housing protects internal electronics from moisture and dust
Internal linear travel sensor provides precise stem tracking without mechanical wear
Compact low-profile construction ideal for skids and tight installation spaces
Typical Applications
Precision throttling control for linear globe valves and micro-flow valves
Sanitary and utility fluid regulation in food, beverage, and brewing plants
Pharmaceutical clean utility, purified water, and clean steam loops
Chemical processing and batch reactor automated feed lines
Industrial HVAC, district heating, and factory boiler steam systems
Water purification, reverse osmosis, and municipal wastewater treatment
OEM process skid fabrication and modular automation equipment
Shipping & Support
Fast dispatch: Australia & Worldwide Shipping
Technical assistance available
1-year warranty
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