Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
Product Introduction
When your process plant’s hazardous area field transmitters need to connect to the safe zone DCS system while meeting strict explosion-proof requirements, this safety barrier acts as the critical energy-limiting protection gate.
It achieves complete electrical isolation between input, output and power circuits, effectively suppressing ground loop interference and preventing high-voltage surges from entering the hazardous area. Its compact modular design fits directly on standard 35mm DIN rails, with intuitive LED status indicators for quick on-site working condition diagnosis.
YOKOGAWA VI451-10
YOKOGAWA VI451-10
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | VI451-10 |
| Power Supply | 24 VDC industrial standard power supply |
| Input Signal | 4-20mA DC from hazardous area field transmitters |
| Output Signal | 4-20mA DC isolated signal to safe zone control system |
| Isolation Strength | Input-output-power full three-way isolation, ≥100MΩ insulation resistance |
| Operating Temperature Range | -20°C ~ +60°C |
| Storage Temperature Range | -40°C ~ +80°C |
| Relative Humidity | 10% ~ 90% RH non-condensing |
| Installation Method | Standard 35mm DIN rail mounting |
| Safety Certifications | ATEX, IECEx intrinsically safe explosion-proof certification |
| Compliance Standards | IEC 61010-1, EMC industrial electromagnetic compatibility standards |
YOKOGAWA VI451-10
Field Application & Technical Pitfalls
Critical Industrial Scenarios
- Oil & Gas Refinery Hazardous Area Monitoring: Connects pressure, temperature and flow transmitters installed in Zone 0/1 explosive areas to the DCS system, ensuring signal transmission meets intrinsic safety requirements.
- Chemical Plant Reaction Process Control: Provides safe signal isolation for reaction tank level and pH sensors in flammable and explosive chemical production zones, preventing electrical sparks from triggering explosion risks.
- Offshore Platform Field Signal Transmission: Delivers reliable signal isolation for offshore platform wellhead monitoring points, adapting to high humidity and salt spray harsh industrial environments.
Non-Negotiable Technical Pitfalls
- ⚠️ Bold Warning 1: Never install this safety barrier directly in the hazardous explosive zone. The third terminal block from the left does not meet on-site explosion-proof enclosure requirements, which will invalidate its intrinsic safety certification.
- ⚠️ Bold Warning 2: Mismatched field sensor parameters will cause signal loss. This unit only supports 4-20mA two-wire transmitters; connecting non-intrinsically safe field devices will break the energy-limiting protection function.
- ⚠️ Bold Warning 3: Skipping the pre-wiring intrinsic safety loop verification will leave you with hidden safety risks. You must confirm the entire loop’s safety parameters match the barrier’s certification specifications before powering on.
A chemical plant maintenance team once swapped a VI451-10 safety barrier and skipped the loop verification. The mismatched field transmitter parameters caused the barrier’s energy-limiting protection to fail, triggering a local alarm that forced a 1.5-hour partial production shutdown for full safety re-inspection.
YOKOGAWA VI451-10
YOKOGAWA VI451-10
Quality Control (QC) SOP & Transparency
- Inbound Verification: Cross-check the OEM serial number against YOKOGAWA’s official part registry, confirm the ATEX/IECEx certification mark is intact, and inspect no damage to the DIN rail mounting clip.
- Live Rig Testing: Power the unit with 24V DC, connect to a calibrated 4-20mA signal simulator, and confirm 2 full hours of stable signal transmission and isolation performance.
- Parameter Testing: Verify 4-20mA input/output accuracy stays within ±0.1% of full scale, confirm three-way isolation resistance meets 100MΩ+ specification, and validate all LED status indicators function correctly.
- Final QA & Packaging: Seal the tested safety barrier in a static-shielding anti-static bag, attach a unique QC passed serial label, and nest it in foam padding inside a rigid industrial shipping carton.
YOKOGAWA VI451-10
Frequently Asked Questions (FAQ)
- Can I hot-swap this safety barrier while the DCS system is running? Yes, but you must first set the corresponding process signal point in the DCS to manual simulation mode, otherwise you will trigger a temporary signal loss alarm.
- What exact YOKOGAWA systems is this module compatible with? It works natively with all YOKOGAWA DCS systems including Centum VP, and is fully compatible with all standard 4-20mA analog input cards from mainstream DCS brands.
- How long is the standard warranty for this new surplus unit? 12 months from delivery. It covers all manufacturing defects, but does not extend to units damaged by overvoltage, miswiring, or improper hazardous area installation.
- How do I tell a genuine OEM unit apart from a refurbished clone? Genuine YOKOGAWA VI451-10 units have a laser-etched part number on the side housing, not a printed sticker. Clone units almost always fail the full three-way isolation performance test.
- What is the typical lead time for shipment? In-stock units ship within 48 hours. If you require official YOKOGAWA intrinsic safety certification documentation, add 2 extra business days to the turnaround window.
- Can this module replace the older VI451 legacy safety barrier? Well, technically it is fully pin-compatible, but you will need to re-run the full intrinsic safety loop parameter verification process to maintain explosion-proof compliance.
Pre: Yokogawa VC401-10 | Direct Replacement Vnet/IP Module
Next: ABB DI810 16-Point Digital Input Module for AC 800M
