info@fuguiautomation.com +86 18827058766
100% Original & Brand New Guarantee 1-Year Warranty
FUGUI Automation FUGUI Automation
English Español Français Deutsch Русский العربية
Request Quote

Search products

Search by technology, medium or application.

01Temperature MeasurementTemperature measurement uses temperature sensors, thermocouples, RTDs and other instruments to accurately detect and monitor process temperatures. 02Level MeasurementLevel measurement uses ultrasonic level meters, radar level meters, and other instruments to detect and monitor the level or height of materials in tanks, vessels, and process equipment. 03Pressure MeasurementPressure measurement uses pressure transmitters, differential pressure transmitters, and other instruments to detect and monitor pressure and pressure changes in pipelines, tanks, and process equipment. 04Flow measurementFlow measurement uses electromagnetic, ultrasonic, vortex, and mass flow meters to detect and monitor the flow of liquids, gases, or steam in pipelines. 05DCSYokogawa DCS cards are core modules of a distributed control system, used to acquire field signals such as temperature, pressure, and flow, while providing control, output, and communication functions. 06Water Quality AnalysisWater quality analysis uses water quality analyzers and online monitoring instruments to detect and monitor key parameters such as pH, dissolved oxygen, turbidity, conductivity, and residual chlorine in water. MODELE+H Proline Promass I 100 Coriolis FlowmeterDesigned for accurate multi-variable measurement of liquids and gases, this Coriolis flowmeter delivers simultaneous in-line viscosity, density, and mass flow data with minimal pressure loss. It features an ultra-compact transmitter and a robust single-tube titanium measuring system for demanding industrial processes. MODELYOKOGAWA A2EE3A-TN | ESB Bus Adapter Connector UnitThe YOKOGAWA A2EE3A-TN ESB Bus Adapter is engineered for Yokogawa CENTUM VP system architecture to connect and terminate the ESB bus at ANT522 optical repeater slave modules. Built for secure terminal connection and signal stability, this component ensures seamless communication extension across industrial automation networks. MODELE+H Levelflex FMP56 Guided Wave Radar Level TransmitterDesigned for continuous level measurement of powdery to granular bulk solids in tall silos and storage vessels, this cost-effective guided wave radar transmitter remains unaffected by heavy dust, filling noise, or thermal stratification. Featuring a high-tensile rope probe capable of withstanding pulling forces up to 12 kN, it integrates HistoROM data management and optional Bluetooth functionality for safe and efficient operation. MODELE+H Proline Promass X 300 Coriolis Mass FlowmeterThe Endress+Hauser Proline Promass X 300 is a maximum-capacity Coriolis mass flowmeter engineered for high-volume measurement of crude oil, refined hydrocarbons, chemicals, and industrial gases up to 4,100 t/h. Featuring a patented four-tube sensor system and integrated Heartbeat Technology, it offers exceptional operational efficiency, minimal pressure drop, and custody-transfer precision for large-scale energy and industrial processing applications. MODELChongqing Chuanyi MS22PSB2D10B0060DMZ Magnetostrictive Level GaugeEngineered for ultimate reliability and high-accuracy fluid monitoring, the MS Series Magnetostrictive Liquid Level Transmitter delivers continuous, real-time measurements for total liquid level and interface positions in demanding industrial environments. Utilizing advanced magnetostrictive sensing technology, this versatile transmitter provides precise, non-contact signal processing with a measurement accuracy up to ±1mm, making it an ideal solution for critical process controls across chemical processing, oil and gas, power generation, and water treatment applications where long-term stability and explosion-proof durability are paramount. MODELE+H FMU30 Non-Contact Ultrasonic Level TransmitterThe Prosonic FMU30 Non-Contact Ultrasonic Level Transmitter provides highly accurate, maintenance-free continuous level and open-channel flow measurement for liquids, pastes, and coarse bulk solids across municipal and industrial applications. Featuring an integrated temperature sensor for automatic sound velocity compensation, a user-friendly 4-line plain text display with 32-point linearization, and a rugged IP68-rated weatherproof enclosure, this compact 2-wire transmitter delivers dependable real-time tank monitoring, pump control, and overflow protection in sewage treatment plants, process water storage, and chemical buffer tanks. MODELE+H Deltabar PMD55B High Precision Smart Differential Pressure TransmitterThe PMD55B High Precision Smart Differential Pressure Transmitter delivers exceptionally accurate differential pressure, flow, and hydrostatic level measurements for industrial liquids, gases, and steam. Featuring a robust metallic diaphragm, ultra-low long-term drift, optional wireless Bluetooth operation, and SIL2/3 functional safety certifications, this versatile instrument provides stable, error-free process monitoring across harsh chemical, oil, and water treatment environments. MODELE+H Waterpilot FMX11 Submersible Hydrostatic Level TransmitterThe Waterpilot FMX11 is a high-precision, heavy-duty submersible hydrostatic level transmitter engineered for continuous liquid level and depth monitoring in fresh water, groundwater wells, drinking water reservoirs, and surface water bodies. Featuring an ultra-compact 22mm stainless steel 316L housing, an integrated atmospheric pressure compensation tube with a protective Teflon filter, and international drinking water certifications, this compact dip cell sensor delivers exceptional long-term stability and precise 4–20 mA signal output even in narrow 1-inch pipes and demanding environmental conditions. MODELChongqing Chuanyi WZGPK-73DH-GB/1P2-AJ150G-M20XC6-AXX-I5/2AM20 Explosion-proof RTDThe WZGPK is a heavy-duty explosion-proof armored Pt100 RTD temperature sensor engineered for accurate thermal monitoring in hazardous industrial environments. Equipped with a high-precision Class A platinum sensing element, a 3-wire connection, a 6mm diameter sheath made of durable 321 stainless steel, and a 150mm insertion length, this flameproof sensor delivers exceptionally fast thermal response, vibration resistance, and long-term stability across a wide temperature range from -200°C to 600°C. Designed with an M20x1.5 process thread and an explosion-proof junction box, it provides reliable flameproof protection and continuous signal accuracy for chemical plants, oil refineries, and automated process control systems. MODELYokogawa ADV151-P50/D5A00 Digital Input Module ExstockEngineered for reliable industrial automation, the Yokogawa ADV151-P50/D5A00 Digital Input Module provides high-density 32-channel, 24 V DC isolated signal processing alongside dedicated connection adapters, ensuring optimal signal integrity, robust noise immunity, and seamless integration into distributed control systems (DCS). MODELYokogawa AAI143-H50 Analog Input Module ExstockThe Yokogawa AAI143-H50 is a high-performance 16-channel isolated analog input module designed for process automation systems, capable of handling 4 to 20 mA standard signal inputs with exceptional stability and accuracy. Supplied with its matching terminal block adapter, this module offers seamless integration, superior noise immunity, and reliable data acquisition for demanding industrial environments. MODELYokogawa S2CP471-01 Controller Module Spare Part ExstockThe Yokogawa S2CP471-01 Controller Module Spare Part provides reliable, real-time control performance and high-speed VNET/IP communication connectivity to optimize your industrial DCS automation system with seamless integration and reduced operational downtime. SOLUTIONSmart water network monitoringCombine verified flow and pressure data for distribution monitoring and operational review. SOLUTIONHydrogen pressure measurementReview materials, pressure range and safety requirements for hydrogen process measurement. SOLUTIONProcess measurement selectionStart from the medium, operating window, installation and required signal before selecting an instrument.

Product Overview

Yokogawa EC401-51 ESB Bus Coupler Module

EC401-51 ESB

The Yokogawa EC401-51 ESB bus coupler module delivers reliable signal interfacing and real-time data communication across distributed control architectures. Featuring a non-explosion protection rating (-5) and ISA Standard G3 conformal coating option (/1), it is built to operate continuously in severe industrial atmospheres. It mounts directly into dedicated FCU processor slots to connect local and remote I/O expansion nodes over high-speed ESB bus lines.

Request Pricing Download product documents
Yokogawa EC401-51 ESB bus coupler module for CENTUM VP FCU

High-Speed Bus Interfacing for Industrial DCS Architectures

In continuous process automation environments such as oil refining, chemical production, and power generation, seamless data transfer between central processors and field I/O nodes is essential for system stability. The Yokogawa EC401-51 ESB Bus Coupler Module serves as a primary communication bridge within the Yokogawa CENTUM VP distributed control system (DCS) framework. Installed directly in slots IO7 and IO8 of the Field Control Unit (FCU), this module facilitates real-time data exchange across the Enhanced Safety Bus (ESB) network.

G3 Conformal Coating for Severe Industrial Environments

Industrial control rooms and field cabinets are frequently exposed to corrosive gases, high humidity, and atmospheric pollutants that can degrade electronic circuitry over time. The EC401-51 model is specifically manufactured with the ISA Standard G3 option (/1), featuring a specialized conformal coating applied to internal circuit boards. This coating provides enhanced protection against reactive sulfide gases, chlorine, moisture, and particulate contamination, significantly extending module lifespan in harsh chemical and marine applications.

Dual-Redundant Configuration and System Reliability

To maintain continuous operation in mission-critical process loops, EC401-51 modules are typically deployed in a dual-redundant configuration within the FCU. In the event of a primary communication channel disturbance, the system automatically seamlessly switches to the redundant module without disrupting real-time control algorithms or field I/O data processing. The module features front-panel status LED indicators to give operators immediate visual feedback regarding communication activity and internal diagnostic status.

Applications

  • Distributed Control Systems (DCS): Bus coupling interface within Yokogawa CENTUM VP control networks.

  • Oil & Gas Processing: High-reliability I/O bus communication in upstream production platforms and downstream refineries.

  • Chemical & Petrochemical Plants: Remote I/O node integration in continuous reaction, cracking, and distillation units.

  • Power Generation Facilities: Boiler control, steam turbine automation, and power distribution management skids.

  • Water & Wastewater Utilities: High-availability remote I/O signal routing in municipal treatment facilities.

Technical Specifications

  • Manufacturer: Yokogawa

  • Product Model: EC401-51

  • Product Type: ESB Bus Coupler Module

  • Explosion Protection Code: -5 (Standard type with no explosion protection)

  • Environment Protection Option Code: 1 (With ISA Standard G3 conformal coating)

  • Bus Interface: Enhanced Safety Bus (ESB) interface

  • Compatible Control Platform: Yokogawa CENTUM VP / CS 3000

  • Installation Location: Slots IO7 / IO8 of Field Control Unit (FCU)

  • Transmission Speed: High-speed ESB bus data transmission

  • Weight: Approximately 0.2 kg

FAQ

Q1: What is the primary function of the Yokogawa EC401-51 module? A: The EC401-51 is an ESB bus coupler module that connects the Field Control Unit (FCU) processor with remote ESB bus node units in Yokogawa DCS systems.

Q2: What does the suffix “-51” represent in the part number EC401-51? A: The “-5” indicates a standard non-explosion proof rating, while the “1” specifies the inclusion of ISA Standard G3 conformal coating for anti-corrosion protection in severe environments.

Q3: Can the EC401-51 be used in a dual-redundant hardware setup? A: Yes. EC401-51 modules are designed to be installed in pairs in slots 7 and 8 of the FCU chassis to establish a dual-redundant ESB communication link.

Q4: What cable type and distance are supported by the EC401 bus connection? A: The EC401 connects via standard copper ESB bus cabling, supporting point-to-point transmission distances up to 10 meters between nodes.

Product documents

Unlock technical documents.

Enter your work email and WhatsApp number once to access all documents for this product.

By submitting, you agree that FUGUI may contact you about this product. Your details are stored privately for sales follow-up.

Explore FUGUI Automation

Discover related product lines, industry applications, technical case studies, and engineering resources.