Product Description
The NFAR181-S50/R8S10 is a high-density RTD input module developed for the N-IO (Network I/O) platform used in CENTUM VP and ProSafe-RS systems by Yokogawa Electric Corporation.
This module is designed to interface with various 3-wire Resistance Temperature Detectors (RTDs), converting low-level resistance signals into high-resolution digital values for precise process monitoring and control.
With 12 isolated input channels, the NFAR181-S50/R8S10 minimizes common-mode noise and prevents cross-channel interference, ensuring stable measurement performance in electrically demanding industrial environments. The “S50” suffix denotes standard environmental specification, while “R8S10” identifies the hardware revision and N-IO enclosure compatibility.
Core Technical Specifications
| Item | Specification |
|---|---|
| Model Number | NFAR181 |
| Suffix / Style Code | -S50/R8S10 |
| Input Channels | 12 isolated channels |
| Supported Sensors | Pt100 (ITS-90/IPTS-68), JPt100, Ni100, Cu10 |
| Wiring Method | 3-wire RTD configuration |
| A/D Conversion | 24-bit Delta-Sigma converter |
| Measurement Range | -200°C to +850°C (sensor dependent) |
| Basic Accuracy | ±0.1°C (Pt100 at standard ambient) |
| Response Time | 40 ms per channel |
| Isolation | 1500 V AC (input to system bus) |
| Power Supply | 24 V DC via N-IO baseplate |
| Current Consumption | 150 mA (typical) |
Application and Installation
The NFAR181-S50/R8S10 is widely used in:
-
Oil & gas refineries
-
Petrochemical complexes
-
Chemical processing facilities
-
High-density temperature monitoring panels
It mounts directly onto an N-IO baseplate (TBN series), supporting compact cabinet layouts, simplified wiring, and online module replacement (hot-swapping) where system configuration permits.
Engineering FAQ
Can this module detect sensor burnout?
Yes. The NFAR181-S50/R8S10 includes built-in burnout detection that generates a system alarm when an open circuit or sensor failure is detected.
Is the “R8S10” version compatible with older N-IO baseplates?
The NFAR181 series is generally backward compatible with standard N-IO infrastructure. However, verifying the firmware revision of the associated Field Control Unit (FCU) is recommended to ensure full functionality.
How does this differ from the NAR181?
The NFAR181 is designed specifically for the N-IO platform with a modular architecture. In contrast, the legacy NAR181 belongs to the FIO series used in earlier Yokogawa hardware generations.
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| Warranty | 12 Months |
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