Yokogawa NFAI143-S50 Analog Input Module

The Yokogawa NFAI143-S50 Analog Input Module is designed to handle 16 channels of isolated current input for 4 to 20 mA signals.

Standard Specifications:

• Model: NFAI143 (*1) (*4)
• Number of Input Channels: 16-channel, isolated input
• Input Signal: 4 to 20 mA
• Allowable Input Current: 24 mA
• Withstanding Voltage: 1500 V AC for 1 minute between input and system (*3)
• Overcurrent Protection: Provided
• Input Resistance:
  • Power ON: 250 Ω
  • Power OFF: 500 kΩ or more
• Accuracy: ±0.1% of full scale
• Data Refresh Cycle: 10 ms
• Input Step Response Time: 100 ms
• Transmitter Power Supply: 24.0 to 25.5 V (output current limit: 25 mA)
• Transmitter Type Setting: Selectable for 2-wire or 4-wire transmitter for each channel via a setting pin
• Temperature Drift: Max. ±0.01%/°C
• Maximum Current Consumption:
  • 230 mA (5 V DC)
  • 540 mA (24 V DC)
• Weight: 0.3 kg
• External Connection: Pressure clamp terminal, MIL connector cable (*3)
• HART Communication: Available (*2)

Additional Specifications:

• Power Supply: Requires a 24 V DC power supply for the analog field power supply terminal of the power supply module.
• HART Communication: For HART communication specifications, refer to the HART Communication Functions document (GS 34P02Q53-01E).
• Intrinsically Safe Applications: A Zener barrier is not permitted with this module. An isolation barrier must be used for intrinsically safe applications.
• Withstanding Voltage: For MIL connector cable (e.g., KMS40), the withstanding voltage between input and system is 500 V AC for 1 minute (*3). The withstanding voltage for other cable types may vary depending on their electrical specifications.

Models and Suffix Codes:

• Model: NFAI143 (4 to 20 mA, 16-channel, Isolated)
• Suffix Codes:
  • -S: Standard Type
  • 5: No explosion protection
  • 0: Basic type

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