NFAI141-S00 Analog Input Module Yokogawa

Yokogawa NFAI141-S00 Analog Input Module

Configured for 4-20 mA transmitter signal acquisition in Yokogawa CENTUM CS/VP system I/O configurations, the Yokogawa NFAI141-S00 (NFAI141 Analog Input Module) provides direct electrical conversion of non-isolated analog current inputs into control system data. This model supports 16-channel input processing and has been discontinued, with NFAI141-S50 specified as the replacement model.

Hardware Specifications

4-20 mA HART Loop and Channel Isolation Characteristics

The NFAI141-S00 receives normalized 4-20 mA DC signals from field transmitters and converts them into digital process values for Yokogawa control systems. The module provides 16 non-isolated differential input channels, while each channel accepts transmitter signals through configured wiring methods.

Furthermore, the module supports HART communication functions when the HART option is selected. Therefore, the input circuit can process analog measurement signals while maintaining compatibility with HART-enabled field instruments. The module uses channel configuration settings to support both 2-wire and 4-wire transmitter connections.

The module does not allow direct connection with Zener barriers for intrinsically safe applications. Instead, isolation barriers must be installed when connecting field devices in hazardous areas.

Frequently Asked Questions

Q: Does the Yokogawa NFAI141-S00 provide isolated input channels?
A: No. The NFAI141-S00 provides 16 non-isolated differential input channels. An external isolation barrier is required for intrinsically safe applications.

Q: What type of field devices can connect to the NFAI141-S00?
A: The module accepts 4-20 mA DC signals from 2-wire or 4-wire transmitters through configured channel settings.

Q: Is the NFAI141-S00 compatible with HART communication?
A: Yes. The module supports HART communication when the HART option configuration is selected.

Field Installation Guidelines

• Install the module according to the Yokogawa I/O base unit installation requirements and system wiring specifications.
• Verify transmitter wiring type before configuration. Select the correct 2-wire or 4-wire transmitter setting for each channel.
• Use shielded signal cables for analog input wiring and connect cable shields according to the control system grounding design.
• Separate analog signal cables from high-voltage power cables and switching circuits to reduce electrical interference.
• Do not connect Zener barriers directly to this module. Use suitable isolation barriers for hazardous area installations.
• Confirm transmitter power supply voltage and current limitation before connecting field instruments.
• Check terminal connections and connector seating before system power activation.