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- Yokogawa
- NFAI135
- Pulse Input Module
- Japan
- 130 x 107.5 x 32.8 mm
- 0.3 kg
- Xiamen, China
- New & In Stock
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We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.
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Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
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We provide 7*24 hours service to our customers. We will be there whenever you need us.
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All our products are priced very favorably because we have our own warehouse and supply.
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Product Overview
The Yokogawa NFAI135 is a Pulse Input Module designed for Yokogawa industrial automation and process control systems. It is used to receive and process pulse signals from field devices such as flowmeters, rotary encoders, energy meters, proximity sensors, and pulse transmitters.
With high-speed pulse counting, electrical isolation, and reliable signal acquisition, the NFAI135 provides accurate pulse measurement for monitoring, totalizing, and control applications.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Yokogawa |
| Model | NFAI135 |
| Product Type | Pulse Input Module |
| Number of Input Channels | 8 Isolated Channels |
| Input Signal Types | Contact ON/OFF, Voltage Pulse, Current Pulse |
| Maximum Input Frequency | 10 kHz |
| Minimum Pulse Width | 40 μs |
| Data Refresh Cycle | 2 ms |
| Channel Isolation | Channel-to-channel and channel-to-system isolation |
| Transmitter Power Supply | Selectable 12 V DC / 24 V DC |
| Mounting Method | Yokogawa controller base unit |
| Dimensions | 130 × 107.5 × 32.8 mm |
| Weight | 0.3 kg |
Function and Working Principle
The NFAI135 receives pulse signals generated by field devices and converts them into digital count values that can be processed by the controller.
Each input channel operates independently with electrical isolation to minimize interference and ensure reliable pulse acquisition. The module continuously counts incoming pulses and transfers the accumulated data to the controller for monitoring, calculation, and process control.
Operating Sequence
- A field device generates pulse signals.
- The NFAI135 detects each incoming pulse.
- Internal circuitry counts and processes the pulses.
- The controller receives the pulse count data.
- The automation system performs monitoring, totalizing, alarms, or control functions.
Key Features
- 8 isolated pulse input channels
- Supports contact, voltage, and current pulse inputs
- Pulse counting up to 10 kHz
- 2 ms data refresh cycle
- Excellent electrical isolation
- High noise immunity
- Compact industrial design
- Reliable long-term operation
System Role
The NFAI135 functions as the pulse signal acquisition interface between field devices and the Yokogawa controller.
Typical System Architecture
Flowmeter / Encoder / Pulse Sensor → NFAI135 Pulse Input Module → Controller → HMI / DCS → Process Control
Industrial Applications
The NFAI135 is widely used in:
- Flowmeter pulse counting
- Energy consumption monitoring
- Rotary encoder signal acquisition
- Production counting systems
- Conveyor automation
- Packaging machinery
- Water treatment facilities
- Chemical processing plants
- Oil and gas production
- Power generation systems
Installation Guidelines
- Install the module in a compatible Yokogawa controller rack.
- Connect pulse input devices according to the wiring diagram.
- Select the appropriate input mode for the connected device.
- Separate signal wiring from high-voltage power cables.
- Ensure proper grounding for improved noise immunity.
- Verify pulse frequency settings during commissioning.
Compatible Components
The NFAI135 is compatible with:
- Yokogawa STARDOM Controllers
- Pulse-output Flowmeters
- Rotary Encoders
- Proximity Sensors
- Energy Meters
- Pulse Transmitters
- Yokogawa I/O Base Units
Alternative Models
| Model | Description |
|---|---|
| NFAP135 | Pulse Input Module |
| NFA1543-S50/A4S00 | Analog Input Module |
| AAP135 | 8-Channel Pulse Input Module |
| ADV151 | Digital Input Module |
| AAI143 | Analog Input Module |
Advantages
- High-speed pulse acquisition
- Excellent electrical isolation
- Supports multiple pulse signal types
- Strong resistance to electrical noise
- Compact modular construction
- Reliable performance in industrial environments
- Easy integration with Yokogawa automation systems
Frequently Asked Questions
What is the NFAI135 used for?
It is used to receive and count pulse signals from industrial field devices such as flowmeters, encoders, and energy meters.
How many input channels does it provide?
The module provides 8 isolated pulse input channels.
What is the maximum pulse input frequency?
It supports pulse frequencies up to 10 kHz.
What input signal types are supported?
It supports contact ON/OFF, voltage pulse, and current pulse input signals.
Which systems is it compatible with?
It is designed for integration with Yokogawa industrial automation and process control systems.
Conclusion
The Yokogawa NFAI135 Pulse Input Module is a high-performance 8-channel pulse acquisition module engineered for accurate pulse counting and signal processing in industrial automation systems. Its high-speed counting capability, electrical isolation, and reliable operation make it an ideal solution for applications involving flow measurement, encoder feedback, energy monitoring, and production counting.