Flowserve Logix 3800 Series Digital Positioner 3821-28ea-D43r-0110-00 Valve Positioner

• Customization: Available
• Product Name: Flowserve Logix 3800 Series Digital Positioner
• Model Number: 3821-28ea-D43r-0110-00 (Varies by Configuration)
• Model NO.: Flowserve Logix 3800
• Primary Function: Digital Valve Positioner for Pneumatic Actuators W
• Measurement Range: 0–100% Valve Travel (Linear or Rotary Valves
• Output Signal: 4–20 Ma + Hart® 7 Protocol
• Pneumatic Output: 20–100 Kpa (3–15 Psi) or 40–200
• Accuracy: ±0.5% of Span
• Actuator Compatibility: Linear or Rotary Pneumatic Actuators
• Wetted Materials: Radial Mounting with 1/2"-20 Uncthreaded Probe
• Process Connections: Flanged (ANSI, DIN, JIS), Threaded (NPT, Bsp)
• Material: Stainless Steel, Brass, EPDM O-Rings
• Environmental Rating: IP66/NEMA 4X (Dust/Water Resistant)
• Temperature Range: -40°c to +85°c (-40°f to +185°f)
• Power Supply: 10.5–40 VDC (Loop-Powered or External)
• Mounting Standard: IEC 60534-6 (Vdi/VDE 3845) Direct-Mount Interface
• Transport Package: Support Air/Land/Sea Transportation
• Specification: 40cm*30cm*30cm*
• Trademark: Flowserve Logix
• 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

Flowserve Logix 3800 Series Digital Valve Positione
Parameter	Specification
Product Name	Flowserve Logix 3800 Series Digital Positioner
Model Number	3821-28EA-D43R-0110-00 (varies by configuration)
Primary Function	Digital valve positioner for pneumatic actuators with HART/Foundation Fieldbus
Measurement Range	0–100% valve travel (linear or rotary valves)
Output Signal	4–20 mA + HART® 7 Protocol / FOUNDATION Fieldbus (FF)
Pneumatic Output	20–100 kPa (3–15 psi) or 40–200 kPa (6–29 psi)
Accuracy	±0.5% of span (±0.1% optional high-accuracy variant)
Actuator Compatibility	Linear or rotary pneumatic actuators (spring/diaphragm or piston types)
Material	Housing: Aluminum AlloyWetted Parts: Stainless Steel, Brass, EPDM O-rings
Environmental Rating	IP66/NEMA 4X (Dust/Water Resistant)
Temperature Range	Ambient: -40°C to +85°C (-40°F to 185°F)Storage: -55°C to +100°C
Certifications	ATEX, IECEx, FM, CSA, SIL 3, RoHS, CE
Power Supply	10.5–40 VDC (loop-powered or external)
Overpressure Limit	2× full-scale pressure (e.g., 200 kPa for 100 kPa range)
Mounting Standard	IEC 60534-6 (VDI/VDE 3845) direct-mount interface
Applications	Oil & gas, chemical processing, power generation, HVAC, and water/wastewater
Applications	Turbines, compressors, pumps, generators, and other rotating equipment

Product Description

Flowserve Logix 3800 Series Digital Valve Positioner 

The Flowserve Logix 3800 Series Digital Valve Positioner is a high-precision,intelligent control solution designed to optimize the performance of throttling valves in demanding industrial processes. Engineered for reliability, accuracy, and adaptability, this advanced positioner ensures precise valve positioning, enhances process efficiency, and minimizes downtime across applications such as oil and gas, chemical processing, power generation, and water treatment. Combining cutting-edge digital technology with robust mechanical design, the Logix 3800 Series delivers superior control in both standard and hazardous environments.

Precision Control with Adaptive Algorithms At the core of the Logix 3800 Series is a sophisticated digital control system that utilizes adaptive algorithms to maintain exceptional positioning accuracy, even under fluctuating process conditions. The positioner dynamically adjusts valve stem position in response to input signals, ensuring tight control over flow rates, pressure, and temperature. With a repeatability of ±0.1% and linearity of ±0.5%, the device guarantees consistent performance, reducing process variability and improving product quality. Its fast response time (typically less than 1 second for a 50% step change) ensures rapid adjustments to maintain optimal process parameters.

The positioner supports both analog (4–20 mA) and digital communication protocols, including HART, Foundation Fieldbus, and PROFIBUS PA, enabling seamless integration into modern distributed control systems (DCS) and programmable logic controllers (PLCs). This flexibility allows for real-time monitoring, remote configuration, and advanced diagnostics, streamlining operations and reducing manual intervention.

Robust Design for Harsh Environments Built to withstand extreme operating conditions, the Logix 3800 Series features a rugged, corrosion-resistant housing rated IP66/IP67 for protection against dust, water ingress, and harsh weather. Available in aluminum or stainless steel variants, the enclosure ensures durability in environments ranging from offshore platforms to chemical plants. The positioner is also certified for use in hazardous areas.

Advanced Diagnostics for Predictive Maintenance The Logix 3800 Series incorporates comprehensive diagnostic capabilities through Flowserve's proprietary ValveSentry™ technology, which continuously monitors valve health and positioner performance. This system detects anomalies such as valve sticking, hysteresis, packing friction, and actuator leaks, providing early warnings to prevent unplanned shutdowns. Real-time diagnostics are accessible via local display or remote asset management software, enabling operators to prioritize maintenance tasks and reduce downtime.

Key diagnostic features include:

Valve travel and speed analysis
Air consumption monitoring
Supply pressure alerts
Partial stroke test (PST) compliance for safety instrumented systems (SIS) By leveraging these insights, plant managers can transition from reactive to predictive maintenance strategies, extending valve lifecycle and reducing operational costs.
User-Friendly Configuration and Installation The positioner's intuitive interface simplifies setup and commissioning, with guided configuration via a local graphical display or PC-based tools like ValveLink™ software. Users can customize parameters such as control modes (auto/manual), split-range operation, and alarm thresholds to align with specific process requirements. The device supports multiple mounting options, including direct mount, Yoke mount, and remote mount, ensuring compatibility with a wide range of valve actuators.

For applications requiring hygiene compliance, such as pharmaceutical or food processing, the Logix 3800 Series is available with stainless steel housings and IP69K-rated enclosures, enabling frequent high-pressure washdowns without degradation.

Energy Efficiency and Process Optimization Flowserve designed the Logix 3800 Series to minimize air consumption, reducing operational costs and environmental impact. Its optimized pneumatic architecture ensures efficient use of instrument air, with a 30% reduction in consumption compared to conventional positioners. This efficiency is achieved through a combination of low-friction internal components and adaptive control algorithms that adjust air flow based on demand.

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.
Order services
Fastest reply:Professional sales engineers 7/24 online services
Payment terms:T/T ,Western union, Paypal, Credit Card, L/C others
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

Q: How long will you give me the reply? 
A: We will reply to you as soon as we see the information 
Q: What is the delivery time? 
A:The products in stock will be shipped after receiving the payment, and the products that need to be ordered are subject to the factory time. 
Q: How about your package? 
A: Do not worry about the package, we have rich experience in packing.
Q: How about the payment terms? 
A:You can choose T/T.