Factory Original Samson 3730 Electro-Pneumatic Positioner 3730-3 Valve Positioner

• Customization: Available
• After-sales Service: Support 1 Year Warranty
• Warranty: 1 Year
• Model NO.: Samson 3730-3 Electro-Pneumatic Positioner
• Max Diameter of Workpiece: 2400mm
• Mass Scope of Workpiece: 900kg
• Type: Material Testing Machine
• Maxcapacity: >1000KN
• Accuracy Grade: 1
• Load Way: Mechanical Load
• Loading Method: Dynamic Load
• Display: Digital
• Control: Manual Control
• Weight: 500-1000Kg
• Power Source: AC110V
• Oil Cylinder Position: Under
• Product Name: Samson 3730-3 Electro-Pneumatic Positioner
• Model Number: 3730-3 (Varies by Configuration)
• Supply Voltage: 12–35 V DC (Standard), Optional 24 V AC
• Pneumatic Output: 0.2–1.0 Bar (3–15 Psi) or 0.6–3.
• Supply Air Pressure: 1.4–7.0 Bar (20–100 Psi) (Standard)
• Control Signal Input: Analog or Digital Communication
• Accuracy: ±0.5% of Span (Typical)
• Response Time: <1 Second (Typical)
• Environmental Temperature: -40°c to +85°c (-40°f to +185°f)
• Protection Class: IP65 / NEMA 4X
• Materials: Aluminum Alloy Housing, Stainless Steel Shaft, EPD
• Mounting: Direct Mount on Rotary or Linear Actuators
• Temperature Range: -40°c to +85°c (-40°f to +185°f)
• Communication: Hart 7 Protocol (Optional)
• Adjustment Range: 0–100% Stroke Position Control
• Transport Package: Support Air/Land/Sea Transportation
• Specification: 40cm*30cm*30cm*
• Trademark: Samson
• Origin: China
• HS Code: 7318190000
• Production Capacity: 1000
• Package Size: 35.00cm * 35.00cm * 30.00cm
• Package Gross Weight: 2.000kg

Product Description

Products Picture

Specification

Samson 3730-3 Electro-Pneumatic Positioner
Parameter	Specification
Model	3730-3
Type	Electro-Pneumatic Positioner (Valve Positioner)
Input Signal	4–20 mA DC (standard), optional 0–20 mA or 0–10 V DC
Supply Voltage	12–35 V DC (standard), optional 24 V AC
Pneumatic Output	0.2–1.0 bar (3–15 psi) or 0.6–3.0 bar (9–45 psi) (adjustable ranges)
Supply Air Pressure	1.4–7.0 bar (20–100 psi) (standard)
Control Signal Input	Analog or digital communication (HART protocol compatible)
Accuracy	±0.5% of span (typical)
Response Time	<1 second (typical)
Environmental Temperature	-40°C to +85°C (-40°F to +185°F) (standard), optional extended ranges
Protection Class	IP65 / NEMA 4X
Materials	Aluminum alloy housing, stainless steel shaft, EPDM seals (standard)
Mounting	Direct mount on rotary or linear actuators
Certifications	CE, ATEX, IECEx (optional variants), NACE MR0175 (for sour service)
Weight	Approx. 2.5 kg (5.5 lbs)
Communication	HART 7 protocol (optional)
Adjustment Range	0–100% stroke position control

Product Description

The Samson Model 3730-3 Electro-Pneumatic Positioner

The Samson 3730-3 Electro-Pneumatic Positioner is a high-precision, digitally enhanced control device designed to optimize valve actuation in industrial process systems. Engineered by Samson AG, a renowned leader in control valve technology, the 3730-3 positioner bridges the gap between electronic control signals and pneumatic valve positioning, ensuring accurate, reliable, and adaptive regulation of flow, pressure, temperature, and other critical process variables. This positioner is widely utilized in sectors such as oil and gas, chemical processing, power generation, and water treatment, where precise control and operational efficiency are paramount. Its advanced features, robust construction, and compliance with global safety standards make it a trusted solution for demanding environments.

At its core, the Samson 3730-3 operates as a microprocessor-based positioner that translates an analog or digital control signal (typically 4–20 mA) into a proportional pneumatic output pressure. This pressure drives a valve actuator, precisely positioning the valve plug to maintain the desired process condition. The device integrates a smart feedback loop, utilizing a non-contacting position sensor to monitor the valve stem's actual position and continuously adjust the output to eliminate deviations. This closed-loop control ensures exceptional accuracy, repeatability, and stability, even in dynamic processes with fluctuating loads or varying media properties.

One of the positioner's standout features is its digital communication capability, which supports protocols such as HART® (Highway Addressable Remote Transducer). This enables seamless integration with asset management systems, allowing operators to perform remote diagnostics, calibration, and configuration adjustments without direct physical access to the device. The HART protocol also facilitates real-time data exchange, including valve health monitoring, error codes, and performance metrics, empowering predictive maintenance strategies and reducing unplanned downtime. For advanced control systems, the 3730-3 can be paired with fieldbus interfaces like FOUNDATION Fieldbus or PROFIBUS, further enhancing its compatibility with modern industrial automation architectures.

The positioner's design prioritizes durability and adaptability. Housed in a rugged, explosion-proof aluminum enclosure with an IP66/NEMA 4X rating, the 3730-3 withstands harsh environmental conditions, including extreme temperatures (-40°C to +85°C), humidity, dust, and mechanical vibration. Its modular construction allows for easy customization to suit specific application requirements, with options for intrinsically safe (ATEX, IECEx) or non-incendive certifications for use in hazardous zones. The device's pneumatic output stage is equipped with high-flow capacity control valves, ensuring rapid response times and stable pressure regulation even in high-actuator-volume scenarios.

A key advantage of the Samson 3730-3 is its user-friendly interface, which simplifies setup and operation. The positioner features a rotatable, backlit liquid crystal display (LCD) that provides real-time feedback on valve position, setpoint values, and diagnostic messages in multiple languages. Local configuration is facilitated via a three-button keypad, enabling adjustments to parameters such as control gain, split-range operation, and alarm thresholds. For complex applications, the device supports advanced tuning features, including adaptive control algorithms that automatically adjust to changing process dynamics, minimizing overshoot and improving control loop performance.

Safety and reliability are embedded into the positioner's design. It meets stringent functional safety standards (SIL 2/3 per IEC 61508) and includes built-in diagnostics to detect issues such as supply pressure loss, valve friction anomalies, or position sensor failures. These diagnostics are critical for maintaining process integrity in safety-critical systems, such as emergency shutdown (ESD) valves or reactor temperature controls. Additionally, the positioner's fail-safe mode ensures predictable valve behavior during power or signal loss, adhering to plant-specific fail-close or fail-open requirements.

Company Profile

Company Profile

KeRul (WeiFang) Automation Equipment Co., Ltd. is speciallzed in industrialautomation instrument development, production and sales, technical servicesand supporting equipment supply of specialized companies, The mainproducts are fow meters, level meters, temperature meters, pressuremeters, electrical meters, thermal meters, programmable controller(PLC), Dcs distributed control system, eight series of more than 1,000specifcations. its products and technologies are widely used in electrlcpower, metallurgy, petrochemical, environ. mental protection, plastics,food,l printing, tobacco, textile, dyeing and other fields.

Our Service

OEM / ODM services
To meet the user diversified requirement, Holykell have established a set of customer service and technical support system with OEM / ODM order as the center, and responded and Handle the customer's requirements in a timely manner to ensure accurate delivery time and product quality.
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Fast delivery: within 24 hours release the cargo (normal spec.), Customized 7-12 days after payment .
 
MAINTENANCE & AFTER-SALES SERVICES
Customer Feedback:  Sales engineers and technical engineers will be one-on-one service for you to exclude all obstacles when use our sensors.
Warranty period: 12 months
Product life-long maintenance: Holykell can provide you with the maintenance of the whole life of the sensors

Packaging & Shipping

FAQ

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