Description

Yokogawa NFAI143‑H50 Analog Input Module

Technical Specifications

• Product Model: NFAI143‑H50
• Brand: Yokogawa
• Warranty: One Year
• Input Voltage: 24 V DC nominal system supply
• Operating Temperature: ‑20 °C ~ +55 °C
• Storage Temperature: ‑40 °C ~ +85 °C
• Response Time: Channel scan cycle approx 50 ms
• Protection Class: IP20 plug‑in DCS I/O module
• Accuracy Class: ±0.1 % FS measurement grade
• Output Frequency: Not applicable
• Rated Current: Max 320 mA @24 V DC; power consumption 7.7 W
• Channel Configuration: 16‑channel isolated analog input, 4‑20 mA DC field‑transmitter signal
• Input Impedance: 250 Ω
• Resolution: 16‑bit A/D conversion
• HART Support: HART 5 / 6 /7 pass‑through for smart transmitter device management
• Isolation: Optical isolation between field channels and system backplane bus
• Diagnostics: Wire‑break detection, module self‑diagnostics, front‑panel LED status indicators
• System Compatibility: Yokogawa Centum VP / Centum CS3000 DCS system
• Certifications: CE, cULus
• Humidity: 5‑95 % RH, non‑condensing
• Weight: 0.30 kg
• Dimensions: 130 × 107.5 × 32.8 mm
• 

Product Overview

NFAI143‑H50 is high‑density 16‑channel analog input I/O module for Yokogawa Centum DCS platform. It acquires 4‑20 mA process signals from field transmitters and converts analog signals to digital data for DCS controllers. Integrated HART communication enables remote transmitter configuration, calibration and secondary‑variable reading. Channel‑level open‑wire diagnostics quickly locate field‑loop wiring faults. Hot‑swap capable for online maintenance without DCS rack power‑down. OEM production discontinued; widely stocked as refurbished / new‑old‑stock spare‑parts for chemical‑plant, refinery DCS‑system maintenance projects.

Application Notes

‑ Must pair with corresponding terminal assembly for field‑cable termination. ‑ Hot‑swap replacement shall follow ESD anti‑static handling procedures. ‑ Configure channel parameters via Yokogawa Control Builder software. ‑ Typical deployment: petrochemical plants, refineries, power‑plants for Centum‑series DCS process‑I/O spare‑part stocking and retrofits.