Samson 3730 Series Digital Electropneumatic Valve Positioner
The Samson 3730 Series Digital Valve Positioner is an intelligent, high-precision electropneumatic device designed for direct attachment to pneumatic control valves in process plants.
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Product Overview
The Samson 3730 Series Digital Valve Positioner is an intelligent, high-precision electropneumatic device designed for direct attachment to pneumatic control valves in process plants. Manufactured by Samson AG, this digital positioner ensures an exact predetermined relationship between the input control signal and the mechanical valve travel. Suitable for both single-acting and double-acting actuators, the 3730 series is compatible with linear globe valves as well as rotary plug and butterfly valves.
Constructed with a rugged die-cast aluminium housing, the positioner operates on a standard two-wire 4 to 20 mA loop and supports digital communication protocols including HART, PROFIBUS PA, and FOUNDATION Fieldbus depending on the sub-model. It features an integrated LCD screen and a single rotary push button for rapid local commissioning, auto-tuning, and on-site configuration. With built-in EXPERT diagnostic algorithms tracking valve wear, stem friction, and air leakage, the Samson 3730 series delivers high reliability across chemical plants, oil refineries, food processing facilities, and power utilities.
Technical Specifications
| Specification | Value |
| Product Name | Digital Electropneumatic Valve Positioner |
| Manufacturer / Brand | Samson AG |
| Model Series | Series 3730 (including 3730-1, 3730-2, 3730-3, 3730-6) |
| Device Type | Microprocessor-Controlled Smart Positioner |
| Input Control Signal | 4 to 20 mA Two-Wire Loop Powered |
| Communication Protocols | HART, PROFIBUS PA, FOUNDATION Fieldbus (Model Dependent) |
| Operating Motion | Linear Motion and Rotary Motion Actuators |
| Travel / Angle Range | Linear: 3.6 to 300 mm / Rotary: 24° to 100° |
| Supply Air Pressure | 1.4 to 7 bar (20 to 105 psi) |
| Air Delivery Capacity | Up to 8.5 Nm³/h at 1.4 bar (Up to 14 Nm³/h at 6 bar) |
| Air Consumption | Less than 0.1 Nm³/h in Steady State |
| Housing Material | Die-Cast Aluminium (Plastic Coated) |
| Ingress Protection Rating | IP66 / NEMA 4X |
| Hazardous Area Approvals | ATEX, IECEx, FM, CSA (Explosion-Proof / Intrinsically Safe) |
| Pneumatic Connections | G 1/4 or 1/4 Inch NPT Female |
| Electrical Cable Entry | M20 × 1.5 or 1/2 Inch NPT Female |
| Operating Temperature Range | -40°C to +80°C (-40°F to +176°F) |
| Display and Interface | Graphic LCD with Single Rotary Push Button |
| Diagnostic Functionality | EXPERTplus Built-In Predictive Valve Diagnostics |
| Condition | New |
| Warranty | 1 Year |
Key Features
Microprocessor control ensures precise dynamic tracking and minimal positioning deadband
Universal mounting capability conforms to IEC 60534-6 (NAMUR) and VDI/VDE 3845 standards
Intuitive local operation via a high-contrast LCD and single rotary push button selector
Automatic zero and span initialization routine enables fast on-site commissioning
Integrated EXPERT diagnostic software monitors valve travel, cycle counts, and seat integrity
Rugged IP66 and NEMA 4X aluminium housing resists aggressive corrosive environments
Certified for explosion-proof and intrinsically safe installation in hazardous zones
Low quiescent air consumption minimizes continuous compressed air utility demand
Supports integration with plant distributed control systems (DCS) and asset management tools
Typical Applications
Precision throttling control for linear globe, angle, and diaphragm valves
Quarter-turn pneumatic actuator positioning on rotary ball and butterfly valves
Chemical and petrochemical processing plants and continuous reactors
Oil and gas upstream extraction, midstream pipeline, and refinery skids
Power generation steam distribution, boiler feedwater, and cooling water loops
Food and beverage processing, brewing, and pharmaceutical fluid utilities
Pulp, paper, and wastewater treatment automated control networks
Shipping & Support
Fast dispatch: Australia & Worldwide Shipping
Technical assistance available
1-year warranty
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