Yokogawa NFAI135-S51 S2 Analog Input Module | Replacement, Equivalent & Selection Guide
The Yokogawa NFAI135-S51 S2 is a high-precision analog input module designed for the STARDOM NF Series distributed control system. This page provides a comprehensive selection guide, compatible replacement models, and sourcing information to help B2B buyers make confident procurement decisions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | NFAI135-S51 S2 |
| Manufacturer | Yokogawa Electric Corporation |
| Series | STARDOM NF Series |
| Module Type | Analog Input Module |
| Input Channels | 8 channels (isolated) |
| Input Signal Range | 4–20 mA / 1–5 V DC (configurable per channel) |
| Resolution | 16-bit A/D conversion |
| Accuracy | ±0.1% of full scale |
| Isolation | Channel-to-channel and channel-to-bus isolation |
| Communication Bus | STARDOM NF internal bus |
| Power Supply | Supplied via NF backplane |
| Operating Temperature | 0°C to +55°C |
| Storage Temperature | -20°C to +70°C |
| Humidity | 5% to 95% RH (non-condensing) |
| Weight | Approx. 1,330 g |
| Compliance | CE, UL, IEC 61131-2 |
Compatible Replacement & Equivalent Models
When the NFAI135-S51 S2 is unavailable or discontinued, the following models may serve as functional replacements or equivalents. Always verify compatibility with your system configuration before substitution.
| Model | Manufacturer | Channels | Signal Type | Compatibility Notes |
|---|---|---|---|---|
| NFAI135-S51 S1 | Yokogawa | 8 | 4–20 mA / 1–5 V | Earlier hardware revision; functionally equivalent in most applications |
| NFAI135-S52 S2 | Yokogawa | 8 | 4–20 mA / 1–5 V | Variant with extended diagnostics; drop-in replacement in NF chassis |
| NFAI145-S51 S2 | Yokogawa | 16 | 4–20 mA / 1–5 V | Higher channel count; suitable when expansion is needed |
| AAI141-S00 | Yokogawa | 8 | 4–20 mA | CENTUM VP series; requires adapter or bus bridge for STARDOM integration |
⚠ Disclaimer: Replacement compatibility depends on firmware version, chassis revision, and system configuration. Contact our technical team for a verified compatibility assessment before ordering.
Why Choose the Original Model
- Guaranteed Fit: The NFAI135-S51 S2 is the factory-specified module for STARDOM NF Series chassis — no adapter or firmware patch required.
- Certified Accuracy: Factory-calibrated to ±0.1% FS with full Yokogawa QC documentation.
- Long-Term Support: Yokogawa provides firmware updates, spare parts, and technical support for the NF Series lifecycle.
- Reduced Commissioning Risk: Using the original part eliminates integration variables and shortens startup time.
- Warranty Compliance: Substituting non-OEM modules may void your system warranty — the original part keeps your coverage intact.
Typical Applications
- Oil & gas process monitoring (flow, pressure, temperature signal acquisition)
- Chemical plant DCS analog loop control
- Power generation turbine and boiler instrumentation
- Water treatment plant sensor data acquisition
- Pharmaceutical batch process monitoring
- Pulp & paper mill process control systems
System Compatibility
The NFAI135-S51 S2 is designed exclusively for the Yokogawa STARDOM NF Series platform. Confirmed compatible system components include:
- Controllers: FCN-100, FCN-500, FCJ
- Chassis / Backplane: NF10S, NF20S, NF40S
- Power Supply Modules: NFPS135-S51, NFPS145-S51
- Communication Modules: NFCP100-S51 (PROFIBUS), NFET100-S51 (Ethernet)
- Engineering Software: FAST/TOOLS, Exaopc, STARDOM Resource Configurator
Selection Guide
Use the following criteria to determine whether the NFAI135-S51 S2 is the right module for your application:
| Requirement | Recommended Model |
|---|---|
| 8-channel analog input, standard 4–20 mA, STARDOM NF chassis | NFAI135-S51 S2 ✓ (this model) |
| 16-channel analog input, same chassis | NFAI145-S51 S2 |
| 8-channel with HART pass-through | NFAI135-H51 S2 (if available) |
| Thermocouple / RTD input | NFTC135-S51 S2 or NFRT135-S51 S2 |
| CENTUM VP system (not STARDOM) | AAI141-S00 or AAI143-S00 |
Not sure which module fits your system? Send us your chassis model and I/O list — our engineers will recommend the correct part within 24 hours.
Quality Assurance & Sourcing
- Genuine OEM Parts: All Yokogawa modules are sourced from authorized distributors or directly from Yokogawa-certified supply chains.
- Pre-Shipment Inspection: Each unit undergoes visual inspection, label verification, and functional power-on testing before dispatch.
- Traceability: Batch records and serial number documentation available upon request for regulated industries.
- Packaging: Anti-static ESD packaging with original manufacturer labeling preserved.
- Warranty: 12-month warranty against manufacturing defects from date of shipment.
How to Order
- Confirm your part number: Verify NFAI135-S51 S2 against your system BOM or nameplate.
- Request a quote: Email [email protected] with quantity, delivery location, and required lead time.
- Receive proforma invoice: We issue a PI within 1 business day with pricing, lead time, and shipping options.
- Confirm & pay: T/T bank transfer, PayPal, or trade assurance accepted.
- Shipment & tracking: DHL / FedEx / UPS express or sea freight — tracking number provided within 24 hours of dispatch.
Replacement & Compatibility FAQ
Q: Can I use NFAI135-S51 S1 instead of S2?
A: In most cases yes — S1 and S2 are hardware revisions of the same model. However, confirm with your system integrator that your firmware version supports the S1 revision.
Q: Is the NFAI135-S51 S2 compatible with CENTUM VP?
A: No. This module is designed for the STARDOM NF Series backplane only. CENTUM VP uses a different bus architecture and requires AAI-series modules.
Q: Do you supply refurbished units?
A: We supply new OEM stock as standard. Refurbished units are available on request with full test reports — please specify when enquiring.
Q: What is the lead time for NFAI135-S51 S2?
A: Typical lead time is 3–10 business days for in-stock units. For out-of-stock items, lead time is 4–8 weeks depending on sourcing. Contact us for real-time availability.
Q: Can you provide a certificate of conformance?
A: Yes. A CoC and inspection report are available for all shipments upon request at no additional charge.
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