Yokogawa NFAI135-S50 Analog Input Module High Quality

Overview

The Yokogawa NFAI135-S50 is an 8-channel isolated analog input module for STARDOM FCN/FCJ controllers. It receives 4–20 mA current signals from field transmitters, enabling accurate monitoring of temperature, pressure, and flow. With robust isolation and high precision, it ensures reliable data acquisition in demanding industrial environments. The module also supports HART communication for enhanced device integration.

Technical Specifications

• Model: NFAI135-S50
• Type: Analog Input Module
• Channels: 8 isolated input channels
• Signal Type: 4–20 mA current input
• Isolation: Channel-to-channel and channel-to-system isolation
• Voltage Drop: Up to 0.8 V due to internal protection circuit
• Power Supply: 24 V DC analog field power required

Fallback Settings

• HOLD: Maintains last value during fallback detection
• SETV: Outputs specified value during fallback detection
• Fallback Detection Time: 4 seconds

Electrical Performance

• Withstanding Voltage: 500 V AC for 1 minute (using KMS40 MIL connector)
• Allowable Input Current: 25 mA
• Input Resistance: 250 Ω (Power ON), ≥ 500 kΩ (Power OFF)
• Accuracy: ±0.1% of full scale
• Data Refresh Cycle: 10 ms
• Input Step Response Time: 100 ms
• Transmitter Power Supply: 20.2–29.3 V DC (depending on field voltage)
• Temperature Drift: Max ±0.01%/°C
• Maximum Current Consumption: 360 mA (5 VDC), 450 mA (24 VDC)
• Overcurrent Protection: Built-in

Connectivity and Installation

• Connect via pressure clamp terminals (e.g., NFTI3S) or MIL connector cable
• Standard type -S50 with no explosion protection
• Optional HART communication available with -H suffix
• Module weight: 0.3 kg