Yokogawa BARD-400A – Zener Barrier Safety Isolator Module | CENTUM VP / CS 3000 Platform
Engineering Background: In process industries where field instruments are installed in Zone 0/1 hazardous areas (Ex ia/ib), the signal path between the field device and the DCS marshalling cabinet must be protected by a certified intrinsic safety barrier. The BARD-400A is Yokogawa’s dedicated Zener barrier module engineered for seamless integration into the CENTUM VP and CS 3000 distributed control system architectures, providing galvanic or Zener-diode-based energy limitation on analog and discrete signal loops.
Product Positioning: The BARD-400A targets process automation engineers and instrumentation designers who require a certified, DIN-rail or backplane-mountable barrier solution that is pre-validated for Yokogawa DCS I/O subsystems. It eliminates the need for third-party barrier qualification, reduces loop commissioning time, and ensures full system warranty coverage from a single OEM source.
Complete Technical Specifications
- Part Number / SKU: BARD-400A
- Manufacturer: Yokogawa Electric Corporation
- Module Type: Zener Barrier / Intrinsic Safety Isolator
- Compatible Platform: CENTUM VP, CENTUM CS 3000, ProSafe-RS (verify with Yokogawa BOM)
- Safety Certification: ATEX / IECEx Ex ia / ib (confirm current certificate revision with Yokogawa)
- Signal Type: Analog (4–20 mA) and/or discrete (consult datasheet for channel configuration)
- Supply Voltage: 24 V DC (nominal, from DCS power bus)
- Maximum Entity Parameters: Ui, Ii, Pi, Ci, Li per ATEX certificate (refer to Yokogawa GS sheet)
- Mounting: Backplane / DIN rail (system-specific)
- Operating Temperature: –20 °C to +60 °C (typical; confirm with GS)
- Weight: 800 g (module + packaging)
- Country of Origin: Japan
Proven Application Environments
- Oil & gas upstream / midstream / downstream process control
- Chemical and petrochemical plant DCS marshalling cabinets
- Pharmaceutical batch process automation (FDA 21 CFR Part 11 environments)
- Power generation auxiliary control systems
- Pulp & paper and water treatment facilities requiring Zone 1 field wiring
Engineering Advantages
- OEM-Validated Integration: Factory-tested compatibility with Yokogawa CENTUM VP / CS 3000 I/O cards — no third-party qualification required.
- Certified Intrinsic Safety: ATEX/IECEx certification ensures compliance with IEC 60079-11 for Zone 0/1 hazardous area installations.
- Reduced Loop Resistance Impact: Optimized Zener network minimizes voltage drop, preserving 4–20 mA loop headroom for long cable runs.
- Compact Form Factor: Backplane-mount design maximizes cabinet density versus standalone DIN-rail barriers.
- Single-Source Accountability: Procuring barriers from Yokogawa OEM supply chain maintains full system warranty and simplifies spare-parts management.
System Architecture & Signal Flow
The BARD-400A is positioned between the DCS I/O card (safe area) and the field instrument (hazardous area). The signal flow is:
DCS Controller → I/O Card → BARD-400A Barrier → Field Instrument (Zone 0/1)
The barrier clamps voltage and current to intrinsically safe entity parameters, ensuring that under any single fault condition, the energy delivered to the hazardous area cannot ignite a flammable atmosphere. The module interfaces directly with the CENTUM VP / CS 3000 node backplane, maintaining system-level diagnostics and loop integrity monitoring.
Sourcing & Quality Verification
- Origin: Sourced from authorized Yokogawa distribution channels and verified OEM surplus inventory.
- Inspection: Each unit undergoes visual inspection, label verification (part number, revision, serial number), and functional continuity check prior to shipment.
- Packaging: Anti-static ESD bag + foam-lined carton; original Yokogawa packaging retained where available.
- Documentation: Certificate of conformance available on request; original Yokogawa GS / IM documentation links provided post-purchase.
Procurement Process
- Submit your RFQ or place order directly via Konmask.com product page.
- Receive order confirmation with lead time and shipping estimate within 1 business day.
- Unit ships with tracking; typical international transit 5–10 business days via DHL / FedEx.
- Post-delivery technical support available via email or WhatsApp for installation queries.
Technical FAQ
Q: Is the BARD-400A compatible with CENTUM VP R6.x?
A: Compatibility depends on the specific I/O node revision. Please provide your CENTUM VP system BOM or node model number and we will confirm compatibility before shipment.
Q: Can this barrier be used with HART-enabled transmitters?
A: Zener barriers are generally HART-transparent; however, verify the barrier’s capacitance and inductance entity parameters against your HART device’s requirements per IEC 60079-25.
Q: Do you provide a warranty?
A: Yes. Konmask.com provides a 90-day functional warranty on all modules. Extended warranty and exchange programs are available — contact us for details.
Q: What is the lead time for bulk orders (>10 units)?
A: Lead time for bulk quantities is typically 2–4 weeks depending on stock availability. Contact support@konmask.com for volume pricing and availability.
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