Yokogawa NFAI141-H00 Analog Input Module

Configured for 16-channel analog signal acquisition in Yokogawa CENTUM VP distributed control systems, the Yokogawa NFAI141-H00 (NFAI141 Analog Input Module) provides direct physical/electrical execution.

Suffix Breakdown & Model Matrix

• NFAI141: Base model designator for the 16-channel 4-20 mA analog input module.
• -H: Includes integrated HART communication capability.
• 00: Basic hardware type configured without explosion-proof protection.
• /A4S00: Optional pressure clamp terminal block.
• /A4S10: Optional pressure clamp terminal block with integrated surge absorber.
• /CCC01: Optional connector cover configured for MIL cable connection.

Hardware Specifications

Process Control and DCS Instrumentation

• 4-20 mA HART Loop Protocol: The analog input circuitry demodulates digital HART communication signals superimposed on the 4-20 mA DC loop. This allows the system host to extract secondary process variables and diagnostics from smart transmitters without disrupting the main analog measurement signal.
• Differential Input Architecture: Non-isolated differential inputs reject common-mode voltage noise up to the hardware limits of the system backplane, ensuring signal measurement accuracy is maintained within ±0.1% of full scale in high-density rack configurations.

Frequently Asked Questions

Q: How does the transmitter power supply protect against field wiring short circuits?

A: Each of the 16 channels features an integrated current-limiting circuit that restricts the transmitter power supply output to a maximum of 27 mA, protecting the module from damage in a short-circuit scenario.

Q: What is the benefit of specifying the /A4S10 option over the /A4S00 option?

A: The /A4S10 option equips the module with an analog pressure clamp terminal block containing a surge absorber, which dampens high-energy voltage transients originating from field wiring before they can reach the input circuits.

Field Installation Guidelines

• Pressure Clamp Terminal Torque Limits: When installing options /A4S00 or /A4S10, ensure field wires are stripped to 6 mm and the clamp terminal screws are tightened to a nominal torque of 0.5 N·m to maintain secure contact resistance.
• Surge Grounding Path: For installations utilizing the /A4S10 surge absorber terminal block, establish a direct, low-impedance ground path between the terminal board ground plate and the cabinet structural safety ground bus.
• MIL Cable Connection Security: If configuring the module with the /CCC01 cover for MIL cabling, verify that the dual locking latches are engaged on both sides of the connector housing to prevent vibration-induced signal interruptions.