Process Control & Signal Isolation Solution — YOKOGAWA EH0*A | Output Isolator Card
Where This Product Is Used
The YOKOGAWA EH0*A Output Isolator Card is deployed in mission-critical process automation environments where signal integrity and ground-loop elimination are non-negotiable. Typical installation sites include:
- Oil & Gas Refineries — Isolating 4–20 mA control signals between DCS output cards and field-mounted control valves or positioners in hazardous areas.
- Chemical & Petrochemical Plants — Preventing ground loops and noise interference in multi-loop reactor control systems.
- Power Generation Facilities — Providing galvanic isolation between turbine control systems and high-voltage field devices.
- Pulp & Paper Mills — Protecting DCS I/O from induced voltages in large motor-drive environments.
- Water & Wastewater Treatment — Ensuring reliable analog output transmission across long cable runs to remote actuators.
- Pharmaceutical Manufacturing — Supporting GMP-compliant control architectures with clean signal separation between process and utility systems.
This card is a standard component within YOKOGAWA CENTUM CS/CS3000/VP distributed control system architectures, installed in the I/O nest of field control stations (FCS).
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | YOKOGAWA Electric Corporation |
| Part Number / SKU | EH0*A (EH0-A series; suffix denotes channel count variant) |
| Module Type | Output Isolator Card |
| Compatible Platform | YOKOGAWA CENTUM CS / CS3000 / VP DCS |
| Signal Type | Analog Output — 4–20 mA DC |
| Isolation Type | Galvanic (channel-to-channel and channel-to-bus) |
| Isolation Voltage | 500 V AC (typical, per YOKOGAWA specification) |
| Operating Temperature | 0°C to +55°C |
| Storage Temperature | -25°C to +70°C |
| Power Supply | Supplied via DCS backplane bus |
| Mounting | DCS I/O nest / rack-mount (CENTUM standard form factor) |
| Weight | Approx. 100 g |
| Compliance | CE Marking; RoHS; IEC 61000 EMC |
Note: The asterisk (*) in EH0*A denotes a channel-count variant. Confirm exact suffix with your CENTUM system BOM or contact Konmask for model clarification.
Why Engineers Specify This Model
- Ground Loop Elimination — Galvanic isolation breaks common-mode ground paths that cause measurement drift and control instability in multi-drop 4–20 mA loops.
- Noise Immunity — Shields sensitive DCS backplane electronics from high-frequency interference generated by VFDs, large motors, and switching power supplies in the field.
- Direct CENTUM Compatibility — Designed as a native I/O card for YOKOGAWA CENTUM platforms; no signal conditioning adapters or external barriers required.
- Hot-Swap Capable — Supports online replacement in CENTUM systems with redundant I/O configurations, minimizing process downtime during maintenance.
- Long Service Life — YOKOGAWA’s industrial-grade component selection ensures reliable operation across the full DCS lifecycle (15–20+ years).
- Simplified Wiring — Integrated isolation eliminates the need for external DIN-rail isolators, reducing panel footprint and wiring complexity.
Complete System Bill of Materials
The EH0*A is typically specified alongside the following CENTUM system components. Konmask can source all items:
- YOKOGAWA CENTUM VP / CS3000 Field Control Station (FCS) — e.g., AFV10D, AFV30D
- CENTUM I/O Nest / Expansion Unit — e.g., ANB10D, ANB11D
- Analog Output I/O Card — e.g., AAO141, AAO145 (pairs with EH0*A for isolated output loops)
- Marshalling Cabinet Terminal Blocks — e.g., YOKOGAWA TB series
- CENTUM Engineering Workstation (EWS) — for configuration and diagnostics
- Fiber Optic ESB Bus Coupler — for remote I/O node expansion
- Redundant Power Supply Unit — e.g., APS13S, APS14S
Contact Konmask with your full system tag list for a consolidated BOM quotation.
Compliance & Industry Standards
- CE Marking — Conforms to EU Low Voltage Directive and EMC Directive requirements.
- RoHS Compliant — Restriction of Hazardous Substances Directive (EU 2011/65/EU).
- IEC 61000 — Electromagnetic compatibility (EMC) for industrial environments.
- IEC 61511 / IEC 61508 — Compatible with functional safety management frameworks when integrated into SIL-rated control architectures (verify SIL rating with YOKOGAWA documentation for specific application).
- ATEX / IECEx — The EH0*A itself is a non-Ex card; for hazardous area field devices, pair with appropriate certified barriers or isolators at the field junction.
- ISO 9001 — Manufactured under YOKOGAWA’s ISO 9001-certified quality management system.
Quality Assurance & Sourcing
Konmask.com specializes in the procurement of genuine, traceable industrial automation components for DCS, PLC, and process control applications. Our sourcing process for the YOKOGAWA EH0*A includes:
- Authenticity Verification — Each unit is inspected against YOKOGAWA OEM markings, label formats, and firmware/hardware revision indicators before dispatch.
- Functional Pre-Check — Where test fixtures are available, cards undergo power-on and signal-path continuity checks prior to shipment.
- Traceable Supply Chain — We source from authorized distributors, decommissioned plant inventories with documented service history, and certified refurbishers.
- Secure Packaging — ESD-safe anti-static bags, foam-lined cartons, and moisture-barrier packaging for international shipment.
- Documentation — Certificate of conformity, inspection report, and packing list provided with every order.
How to Source This Part
Ready to procure the YOKOGAWA EH0*A? Here’s how to get started with Konmask:
- Step 1 — Confirm Your Exact Variant: Identify the full part number suffix (e.g., EH01A, EH02A) from your CENTUM system BOM or existing card label.
- Step 2 — Submit a Request: Email [email protected] or call +0086 19859288691 with your part number, required quantity, and delivery timeline.
- Step 3 — Receive Quotation: We respond within 1 business day with pricing, lead time, and availability confirmation.
- Step 4 — Order & Ship: Secure payment via T/T bank transfer or agreed terms. Worldwide shipping via DHL, FedEx, or freight forwarder.
- Step 5 — Receive & Install: Unbox, verify against packing list, and install per YOKOGAWA CENTUM I/O replacement procedure.
Application-Specific FAQ
Q: Is the EH0*A compatible with both CENTUM CS3000 and CENTUM VP?
A: Yes. The EH0*A Output Isolator Card is designed for use across the YOKOGAWA CENTUM platform family including CS, CS3000, and VP generations. Always verify the I/O nest compatibility with your specific FCS model.
Q: Can I use the EH0*A to replace a failed isolator card without shutting down the process?
A: In CENTUM systems configured with redundant I/O, hot-swap replacement is supported. For non-redundant configurations, a controlled output hold or manual override should be implemented before card removal. Consult your CENTUM system safety procedures.
Q: What is the difference between EH01A, EH02A, and other EH0*A variants?
A: The numeric suffix typically denotes the number of isolated output channels per card. Contact Konmask with your system documentation to confirm the correct variant for your I/O nest slot.
Q: Do you supply new or refurbished units?
A: Konmask supplies both new-old-stock (NOS) and professionally refurbished units depending on availability. All units are inspected and documented. Condition is clearly stated in the quotation.
Q: Can Konmask source other YOKOGAWA CENTUM I/O cards?
A: Yes. We maintain an extensive inventory of YOKOGAWA CENTUM components including analog input/output cards, digital I/O, communication modules, power supplies, and FCS units. Submit your full BOM for a consolidated quote.
Q: What is the lead time for the EH0*A?
A: Lead time varies by stock availability. In-stock units ship within 3–5 business days. For sourced units, typical lead time is 2–4 weeks. Expedited sourcing is available for urgent plant requirements.
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Contact: [email protected] | +0086 19859288691
