Samson 3725 Positioner

The Samson Type 3725 Electropneumatic Positioner is an advanced, high-durability control instrument engineered for accurate valve positioning across a wide range of pneumatic actuators. Designed specifically for reliable throttling service, it accepts a standard 4-20mA analog control signal and converts it into a highly responsive pneumatic output, ensuring stable and repeatable valve performance.
As part of Samson's next-generation positioner platform, the Samson 3725 positioner combines rugged, modern construction with simplified operation. It is the ideal choice for process plants seeking superior reliability and precision without the complexity or infrastructure requirements of digital communication or complex diagnostic systems.

The Samson 3725 sets the standard for advanced analog control:
1. Advanced Durability & Non-Contact Technology
Rugged Housing: Constructed with a high-strength Polyphthalamide (PPA) housing, providing exceptional resistance to vibration, extreme temperature variation, and aggressive operating conditions.
Non-Contact Sensing: Utilizes advanced non-contact position sensing, ensuring stable and immune performance against external environmental impacts, dirt, and steam hammering.
Continuous Monitoring: Features continuous zero monitoring to enhance operational safety and maintain precise calibration over time.
2. Flexible Compatibility & Precise Control
Broad Compatibility: Suitable for both linear and rotary actuators, covering single-acting and double-acting types (double-acting requires Type 3710 Reversing Amplifier).
Mounting Standards: Supports standard industrial mounting interfaces including IEC 60534-6 and VDI/VDE 3845, along with full SAMSON integral mounting options.
Control Performance: Delivers smooth and stable modulation suitable for demanding throttling applications, including a dedicated tight-closing function for optimal shutoff control.
3. Intuitive Operation & Fast Commissioning
Simplified Interface: Features three capacitive touch keys and a multilingual navigation menu for quick, tool-free configuration.
Automatic Start-Up: Ensures fast commissioning through an automatic start-up sequence using simple preset parameters.
Reliable Data Storage: All configuration settings are stored in non-volatile EEPROM, guaranteeing parameter retention even during power loss.
Optimal Visibility: Includes a rotatable display that ensures optimal visibility regardless of the positioner's mounting orientation.

The Samson 3725 positioner is a robust solution that fits traditional control loops requiring high performance without BUS communication:
Pure Analog Control: No complex digital BUS communication is required-perfect for plants relying strictly on 4-20mA analog control loops.
Safety Variants: Available with or without Intrinsic Safety (Ex i) certification, allowing compliance for use in specific hazardous areas.

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