Logix 3800 Digital Positioner
Overview
The Logix 3800 digital positioner brings reliable, high-performance control to both linear and rotary valves across a wide span of process control duties. It supports both single-acting and double-acting actuators in one versatile platform, reducing the number of distinct positioner models a maintenance store needs to carry, cutting complexity and inventory needs for maintenance teams standardizing on a single positioner platform. With quick one-button calibration, technicians can install and start up faster in any environment, helping plant owners and operators maximize production while minimizing operating costs across a wide range of valve automation applications.
As a trusted supplier of Flowserve valve solutions, Seven Star LLC proudly offers the Logix 3800 to oil and gas, chemical, power generation, and general industrial applications across the Sultanate of Oman, Muscat, and the wider GCC. It is the choice for applications that require a balance of technological sophistication and long-lasting reliability in tough environments, from desert heat to offshore salt-air exposure.
Measurement Principle
The Logix 3800 uses a shielded, dual-element, non-contact magneto-resistive position sensor combined with a temperature-compensated single-acting and dual-acting pneumatic design to ensure stable performance across a wide ambient temperature swing. The dual-element feedback sensor is contactless, limiting the number of moving parts and enhancing long-term reliability even in high-vibration rotary valve service.
Advanced predictive diagnostics include five intelligent onboard pressure sensors, powered by ValveSight DTM, that identify developing problems in valves and actuators before they become critical failures. This enables operators to better assess and prioritize corrective actions before a developing fault turns into an unplanned process trip, supporting proactive management of downtime and throughput across an entire plant’s automated valve population, and can be extended further via connection to the RedRaven platform for asset health monitoring.
Engineering Design of the Logix 3800
The Logix 3800 features a rugged, modular design constructed from copper-free aluminum and stainless steel, with IP66 protection against dirt, water, impact, and vibration. In single-acting configuration, it delivers 20.4 Nm3/h (12 SCFM) air capacity at 4.1 bar (60 psi) with less than 0.25 Nm3/h air consumption, operating from -40°C to +85°C; in double-acting configuration, it delivers 30.6 Nm3/h (18 SCFM) air capacity with 0.082 to 0.637 Nm3/h consumption, operating from -52°C to +85°C.
One-button quick calibration automatically sets zero, span, and gain, simplifying commissioning to under 60 seconds. The positioner offers broad application versatility supporting analog, HART, Foundation Fieldbus, 4-20mA, and discrete I/O signals, with an optional remote-mount module for locating the positioner away from the valve in a more accessible or lower-vibration location. It carries SIL 3 capable certification (double-acting) with ATEX/IECEx and China CCC hazardous area approvals, including Ex db and Ex ia protection methods for both Zone 1 and Zone 2 installations.
Key Features
The Logix 3800 combines proven pneumatic control with intelligent diagnostics in a single unit. Core capabilities include:
- Supports both linear and rotary valves, single- and double-acting actuators.
- Non-contact magneto-resistive position sensor for long-term reliability.
- One-button quick calibration—commissioning in under 60 seconds.
- Five onboard pressure sensors with ValveSight DTM predictive diagnostics.
- SIL 3 capable (double-acting); ATEX/IECEx, China CCC approvals.
- IP66 rugged construction resistant to dirt, water, impact, and vibration.
- Analog, HART, Foundation Fieldbus, 4-20mA, and discrete I/O compatibility.
- Optional Zero-Bleed automation package for near-zero fugitive emissions.
Industrial Applications
The Logix 3800 is well suited to oil and gas, chemical, and power generation facilities across Oman requiring reliable, high-precision valve control with advanced diagnostic capability. Its compatibility with Valtek Mark One, Automax rack and pinion actuators, and other OEM valve/actuator combinations makes it a versatile choice for process automation throughout the region.
Technical Specifications
Full technical parameters for the Logix 3800 digital positioner:
| Parameter | Specification |
|---|---|
| Model | Logix 3800 |
| Valve Type | Linear and Rotary |
| Actuator Type | Single-Acting and Double-Acting |
| Air Capacity (Single-Acting) | 20.4 Nm3/h @ 4.1 bar (12 SCFM @ 60 psi) |
| Air Capacity (Double-Acting) | 30.6 Nm3/h @ 4.1 bar (18 SCFM @ 60 psi) |
| Operating Temperature | Single-acting: -40 to +85°C (-40 to 185°F); double-acting: -52 to +85°C (-61.6 to 185°F) |
| Materials | Copper-Free Aluminum, Stainless Steel |
| Communication | Analog, HART, Foundation Fieldbus, 4-20mA, Discrete I/O |
| Ingress Protection | IP66 |
| Safety Rating | SIL 3 Capable (Double-Acting) |
| Hazardous Area Approvals | ATEX, IECEx, China CCC, Ex db, Ex ia |
| Air Consumption (Single-Acting) | <0.25 Nm³/h @ 4.1 bar (<0.15 SCFM @ 60 psi) |
| Air Consumption (Double-Acting) | 0.082 to 0.637 Nm³/h @ 4.1 bar (0.048 to 0.375 SCFM @ 60 psi) |
| Position Sensor | Shielded dual-element, non-contact magneto-resistive |
| Compliance Voltage | 10 VDC @ 20 mA |
| Effective Resistance | 500 ohm @ 20 mA |
| HART Revision | HART 6 standard; can be configured as HART 7 in the field |
| Housing Options | Aluminum intrinsically safe, aluminum explosion-proof (Ex d), stainless steel explosion-proof (Ex d) |
| Actuation Medium | Air, or natural gas with the double-acting low bleed relay |
Logix 3800 Configuration Options
Diagnostic Warnings and SIL Scope
Why Choose Seven Star LLC for Digital Positioner Integration
A digital positioner’s real value comes from matching it correctly to the existing actuator (single- or double-acting), the plant’s control protocol (HART, Foundation Fieldbus, or discrete), and any diagnostic software the maintenance team already uses – ordering the wrong air-capacity configuration or protocol variant means a positioner that technically works but doesn’t integrate cleanly into the existing asset-management workflow. Seven Star LLC’s engineers confirm actuator type, control signal, and diagnostic software compatibility with the customer before the Logix 3800 is ordered, and help plan the ValveSight DTM or RedRaven integration for customers building out predictive maintenance capability. We also support commissioning across Oman’s oil and gas and power generation sector, helping technicians take advantage of the one-button calibration feature to minimize startup time during a planned turnaround.
Request a Quote for Logix 3800 Digital Positioner
To submit a formal Request for Quote (RFQ), check current availability and lead time, or arrange technical consultation for the Logix 3800 Digital Positioner, please contact the instrumentation division at Seven Star LLC today. As a trusted supplier of Flowserve valve solutions in Oman and the GCC, our engineers are ready to assist with rapid sourcing for your valve automation and positioning projects.
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- Instruction Manual Flowserve Logix 3800 Digital Positioner Manual Download
Flowserve product families listed here
Flowserve pumps on this page are the Durco Mark 3 ANSI process pump and the ECPJ vertical sump pump built to API 610 type VS4. Sealing products are the ISC2 cartridge mechanical seal to API 682 and DuraClear barrier fluid for dual seal systems. Flowserve valves include the Valtek Mark One globe control valve, Argus floating and trunnion-mounted ball valves (EK71, FK79, FK76M) and Durco Microfinish ball valves. Automation is covered by Limitorque MX and L120 multi-turn electric actuators, the Rotadisk RD and RDF pneumatic actuator and the Logix 3800 digital positioner.Where Flowserve equipment is used
Mark 3 pumps handle acids, caustic, solvents and utilities in chemical and petrochemical units. VS4 sump pumps drain pits and collection tanks. Valtek control valves and Argus ball valves are found in refining, gas processing, power and desalination, and Limitorque actuators operate gate and globe valves on pipelines, tank farms and water networks across the GCC.Ordering Flowserve parts: what we need
The serial number on the nameplate is the key to Flowserve records for a pump, valve or actuator. Please add the following by product type:- Pumps: size and model, impeller diameter, materials, seal arrangement, and the part name and item number from the sectional drawing
- Mechanical seals: seal type and size, drawing or part number, materials code, pumped fluid and flush plan
- Valves: size, pressure class, body and trim materials, end connections, and the actuator and positioner model
- Limitorque actuators: unit size, order and serial number, supply voltage, wiring diagram number
Browse Flowserve products by category: Control Valves, Pumps, Valve Actuator, Valve Positioner.
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