uR1800 Yokogawa

uR1800 Yokogawa Termination Unit

Product  Description：

Yokogawa Termination Units, widely utilized in the CENTUM Distributed Control System (DCS) and ProSafe-RS safety instrumented systems, serve as the dedicated physical interface for field wiring connection. These units function as the intermediary between field devices (such as transmitters, valves, and switches) and the system’s I/O modules. They simplify signal routing, manage electrical distribution, and provide a secure, organized environment for multi-core field cables.

Product Parameters

The technical composition of a Yokogawa Termination Unit centers on high-density connectivity, signal integrity, and environmental resilience:

• Connection Density: Available in various configurations, commonly supporting 16-channel, 32-channel, or 64-channel connection points per unit.

• Signal Type Compatibility: Engineered to handle diverse signal categories including 4-20mA analog current loops, 1-5V DC analog voltage, discrete dry contacts, and digital pulse inputs.

• Rated Insulation Voltage: Designed with robust dielectric strength, typically rated for 250V AC or higher to protect internal circuitry from transient spikes.

• Terminal Block Type: Offered in pressure-clamp, spring-clamp, or traditional screw-terminal designs to match different field installation habits.

• Cable Interface: Equipped with specialized multi-pin system cable connectors (such as KS1 or KS2 cables) that provide a direct, pre-fabricated link to the I/O nest.

• Ambient Temperature Range: Built to withstand typical control room or field enclosure environments, generally rated for operation from -20°C to 70°C.

Product Advantages

Yokogawa Termination Units are engineered to maximize plant availability and minimize installation errors:

• Simplified Engineering and Maintenance: Pre-fabricated system cables allow for rapid connection to the I/O modules, reducing manual point-to-point wiring and significantly shortening commissioning times.

• Enhanced Signal Security: Built-in surge absorbers, fuses, and current-limiting resistors protect the expensive I/O modules from field-side electrical faults, short circuits, or lightning strikes.

• Robust Noise Mitigation: Designed with dedicated shielding layers and grounding bars to isolate low-level instrument signals from high-frequency electromagnetic interference.

• Space Optimization: High-density layouts allow a large number of field wires to be terminated within a minimal footprint inside the marshalling cabinet.

• Long-Term Durability: Highly resistant to corrosive environments, often featuring conformal coating options that meet ISA G3 specifications for harsh industrial atmospheres.

Product Applications

These units are foundational components in large-scale process control and safety architectures:

• Oil and Gas Refineries: Interfacing with hundreds of field temperature transmitters, pressure gauges, and control valves across processing blocks.

• Petrochemical Plants: Providing reliable signal termination for complex reaction monitoring systems where signal downtime is not permissible.

• Power Generation Facilities: Marshalling high-density digital and analog signals from boiler controls, turbines, and cooling systems.

• LNG Storage and Transport: Acting as the terminal interface for safety-critical ESD (Emergency Shutdown) loops and fire and gas detection monitors.

• Water Treatment and Desalination: Managing distributed I/O wiring across large geographic layouts of pumping stations and filtration beds.

Important Precautions

To preserve the safety and performance of the termination unit, the following operational constraints must be observed:

• Precise Signal Alignment: Ensure that the field wiring polarity matches the specific terminal assignments. Miswiring a current loop can cause damage to the loop power supply or the module interface.

• Fuse Verification: When replacing blown fuses on fused termination units, always use the exact amperage and speed rating specified by Yokogawa to prevent compromising circuit protection.

• Cable Strain Relief: Ensure that external field cables are properly supported and strain-relieved within the marshalling cabinet so that their weight does not pull on the individual terminal clamps.

• Separation of Signal Classes: Keep high-voltage AC signal lines physically segregated from low-voltage DC analog signal lines within the routing ducts to prevent cross-talk and induction noise.

• Tightening Torque: For screw-type terminal units, apply the correct tightening torque specified in the technical manual. Overtightening can strip the threads, while undertightening causes high electrical resistance and intermittent signal loss.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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