NFAI143-H50 Yokogawa

NFAI143-H50 Yokogawa Termination Unit

Product  Description：

Yokogawa Termination Units, primarily utilized within the CENTUM Distributed Control System (DCS) and ProSafe-RS safety instrumented systems, serve as the dedicated physical interface for field wiring connection. These units act as the intermediary bridge between field devices (such as transmitters, valves, and switches) and the system's I/O modules. They simplify marshaling procedures, provide electrical protection, and ensure clean signal routing into the control system.

Product Parameters

The technical configuration of a Yokogawa Termination Unit focuses on electrical capability, signal capacity, and isolation properties:

• Channel Capacity: Commonly designed to support 16-channel or 32-channel configurations to match the density of corresponding I/O modules.

• Signal Type Compatibility: Available in dedicated versions for analog inputs/outputs (4-20mA), digital inputs/outputs (24V DC), and thermocouple or RTD temperature signals.

• Maximum Voltage Rating: Typically rated to handle up to 250V AC or 125V DC on the field side, depending on the specific model type.

• Connection Interface: Features robust screw terminals or spring-clamp terminals for field-side wiring, paired with a dedicated multi-pin cable connector for the system I/O module side.

• Insulation Resistance: Offers minimum insulation resistance of 100 Megohms measured at 500V DC between the signal terminals and the grounding frame.

• Rated Current Per Channel: Generally supports up to 1A per channel for signal processing, with specialized digital output units capable of handling higher current loads via integrated relays.

Product Advantages

Yokogawa Termination Units provide crucial operational, maintenance, and safety benefits for large-scale processing plants:

• Enhanced Signal Protection: Many termination units come equipped with built-in surge absorbers, fuses, or current limiters that protect expensive upstream I/O cards from lightning strikes and field short circuits.

• Simplified Field Maintenance: Isolating field wiring to a dedicated block allows technicians to disconnect or loop-test field instruments without risking accidental damage to the core PLC or DCS hardware.

• Cross-Wiring Efficiency: Reduces control panel clutter by organizing hundreds of field cables into standardized, high-density multi-core cables that plug directly into I/O racks via pre-fabricated cables.

• High Reliability Connection: Utilizes vibration-resistant termination technology to prevent wires from backing out over time, ensuring continuous signal integrity in high-vibration plant environments.

• Built-in Conditioning Options: Specialized models integrate terminal-side resistors or relays directly onto the unit, eliminating the need for external signal conditioning components.

Product Applications

These units are deployed globally across continuous process control and safety shutdown architectures:

• Oil and Gas Marshaling: Organizing thousands of discrete and analog field inputs from wellheads, pipelines, and offshore separation units before routing them to the main control room.

• Chemical Plant Processing: Interfacing safety-critical sensors (such as flame and gas detectors) with emergency shutdown systems via redundant termination units.

• Power Generation Instrumentation: Collecting high-density temperature data from steam turbines and boilers using thermocouple-specific termination blocks with cold-junction compensation.

• Pharmaceutical Batch Control: Managing isolated I/O routing for sterile manufacturing environments where precise control loop integrity is legally mandated.

• Iron and Steel Smelting: Distributing high-voltage digital control signals to heavy-duty actuators and valves across harsh, high-temperature production floors.

Important Precautions

To guarantee safe operation and avoid signal degradation, the following guidelines must be followed during installation and servicing:

• Grounding and Shielding: The shield terminal bar of the termination unit must be tied to a clean, isolated instrument ground. Improper shielding connections can introduce common-mode noise into analog loops, causing measurement drifting.

• Correct Cable Matching: Only use authorized Yokogawa signal cables to connect the termination unit to the I/O module. Third-party cables may have incorrect pin mapping or inadequate shielding, which can cause communication errors or hardware damage.

• Tightening Torque Adherence: When using screw-terminal models, tighten field wires to the exact manufacturer-specified torque rating. Overtightening can strip the threads, while undertightening results in high contact resistance and intermittent open circuits.

• Fuse Replacement Protocols: If a channel's protection fuse blows, investigate and resolve the underlying field fault before replacing the fuse. Always use replacement fuses that match the precise voltage and current rating specified on the unit housing.

• Environmental Protection: Install termination units within a sealed, dust-proof control cabinet. If the ambient atmosphere contains corrosive gases like hydrogen sulfide, specify units with conformal coating and ensure the cabinet climate control is operational.

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

Please make an inquiry for more models：

Yokogawa VI702

Yokogawa EJX-530A

Yokogawa CP451-10

Yokogawa EC401-10

Yokogawa ALE111-S00

Yokogawa AFV10D

Yokogawa UT55A-040-11-00

Yokogawa ADV151

Yokogawa ANB10D

Yokogawa AAI143-S

Yokogawa AAI543-S

Yokogawa ADV551

Yokogawa SAI143-H63

Yokogawa PW301

Yokogawa AAI543-H00

Yokogawa EB401-10

Yokogawa UM-330-00

Yokogawa R/475-HP1EKLUGMT/S

Yokogawa UT55A-132-11-00

Yokogawa EC401-51

Yokogawa NFAI143H

Yokogawa NFDV151

Yokogawa NFPW444-10

Yokogawa NFAP135

Yokogawa NFSB100-S50

Yokogawa NFLR121

Yokogawa CP401

Yokogawa FLXA21-D-P-D-AB-C1-NN-A-N-LA-N-NN/UM

Yokogawa ADV151-P50

Yokogawa YTA610-JA1A2DK/X2/KU2

Yokogawa ADV151-P00

Yokogawa YTA110-EA4DN/KU2

Yokogawa VF701

Yokogawa SNT501

Yokogawa SDV541-S63

Yokogawa SDV144-S63

Yokogawa YS1700

Yokogawa EC401-50

Yokogawa RCCF31

Yokogawa SCP451-11

Yokogawa SCP461-51

Yokogawa SSC60D SCP461-51

Yokogawa 45TIT8055 YTA610

Yokogawa YTA320-FA2DB/KS15/S2

Yokogawa PW482-50

Yokogawa S9129FA

Yokogawa ADV551-P10

Yokogawa YHC5150X

Yokogawa YTA110-EA4DB

Yokogawa PW401-S2

Yokogawa SAI-143-H63

Yokogawa 436103

Yokogawa SAI143-H33

JUSTWELL PTE. LTD. sells new and discontinued products, and purchases such specialty products through independent channels. JUSTWELL PTE. LTD is not an authorized distributor, distributor, or representative of the featured products on this website. All product names/images, trademarks, brands, and logos used on this website are the property of their respective owners. Product descriptions, descriptions, or sales with these name images, trademarks, brands, and logos are for identification purposes only and do not imply any association or authorization with any rights holders.

This article is from the official website of JUSTWELL PTE. LTD. If reprinted, please attach this link: https://justwellltd.com .com

JUSTWELL PTE. LTD

Our main products include DCS control system spare parts, PLC system spare parts, and robot system spare parts. Our advantageous brands include Allen Bradley, Bently Nevada, ABB, HIMA, Reliance, Bender, National Instruments, Emerson Ovation, Honeywell, Siemens, Allen Bradley, ICS Triplex, FOXBORO, Schneider, GE Fanuc, Motorola, HIMA, Prosoft, and other imported industrial components. Our main products serve a wide range of electronic, metallurgical, chemical, and power plants Industries such as steel mills, rubber, cement, machinery and equipment, and construction.