Introduction
The Yokogawa NFAI143-H50 Analog Input Module is a high-reliability, 16-channel isolated analog input unit designed for advanced process automation systems, including Yokogawa STARDOM FCN/FCJ and CENTUM DCS platforms. It is engineered to accurately capture and convert 4–20 mA field signals into digital data for real-time monitoring and control.
With built-in HART communication capability (H suffix) and industrial-grade isolation, this module is widely used in mission-critical environments where signal accuracy, stability, and system safety are essential. It is especially suitable for large-scale process industries requiring robust data acquisition under continuous operation.
Technical Specifications
| Parameter | Specification |
|---|
| Model | NFAI143-H50 |
| Manufacturer | Yokogawa |
| Type | Analog Input Module |
| Input Channels | 16 channels (isolated) |
| Input Signal | 4–20 mA DC |
| Allowable Input Current | Up to 24 mA |
| Accuracy | ±0.1% of full scale |
| Data Refresh Cycle | 10 ms |
| Step Response Time | 100 ms |
| Isolation Voltage | 1500 V AC (input to system) |
| Input Resistance | 250 Ω (power ON), ≥500 kΩ (power OFF) |
| Transmitter Supply | 24.0–25.5 V DC |
| Communication | HART-enabled (H suffix) |
| Power Consumption | ~230 mA (5V), ~540 mA (24V) |
| Operating Temperature | -20°C to +70°C |
| Weight | ~0.3 kg |
| Dimensions | Approx. 155 × 130 × 32.8 mm |
Applications
The NFAI143-H50 is designed for demanding industrial environments where high-density analog signal processing is required.
Typical applications include:
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Oil & gas production and pipeline monitoring
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Petrochemical refining and chemical processing
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Power generation and turbine control systems
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Water treatment and utility infrastructure
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Industrial automation and SCADA/DCS systems
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Process instrumentation and field transmitter monitoring
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Safety and condition monitoring systems
Its isolated architecture and HART communication support make it especially effective in intelligent field device integration.
Advantages
The Yokogawa NFAI143-H50 delivers strong performance advantages in modern industrial systems:
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16-channel isolated architecture improves system reliability
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High accuracy (±0.1%) ensures precise process measurement
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Fast 10 ms data refresh supports real-time control applications
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1500 V isolation protection enhances electrical safety
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HART communication support enables smart device integration
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Stable long-term operation in harsh industrial environments
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Flexible transmitter compatibility (2-wire / 4-wire)
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Low drift and strong signal integrity design
Technical FAQs
1. What is the main function of NFAI143-H50?
It converts analog 4–20 mA signals into digital data for control systems.
2. How many channels does it support?
It supports 16 isolated analog input channels.
3. Does it support HART communication?
Yes, it supports HART protocol via the “H” suffix.
4. What is the input signal type?
Primarily 4–20 mA DC current signals.
5. What is the accuracy level?
Approximately ±0.1% of full scale.
6. What is the isolation rating?
Up to 1500 V AC between input and system.
7. What is the response time?
About 100 ms step response time.
8. What is the data refresh cycle?
Approximately 10 ms.
9. What is the weight of the module?
Around 0.3 kg.
10. What systems is it used with?
Yokogawa STARDOM FCN/FCJ and CENTUM control systems.
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