NFAR181-S50 | Yokogawa STARDOM RTD Input Module

Product Overview

The Yokogawa NFAR181-S50 functions as a high-precision RTD (Resistance Temperature Detector) input module for the STARDOM autonomous controller series. It interfaces directly with Pt100 sensors in a 3-wire configuration to provide accurate temperature monitoring across a vast thermal spectrum. We supply this unit as 100% Brand New and Original, ensuring your process control system benefits from factory-certified calibration and high-integrity electrical isolation.

Part Number Breakdown

The NFAR181 series utilizes Yokogawa's modular suffix system to define hardware revision and compatibility:

Technical Specifications

The NFAR181-S50 delivers superior measurement performance for critical temperature loops:

• Input Channels: 12 electrically isolated channels

• Sensor Type: Pt100 (3-wire configuration)

• Input Range: -200°C to 800°C

• Measurement Accuracy: ±0.15°C

• Update Rate: 1 second data refresh cycle

• Withstanding Voltage: 1500 V AC for 1 minute (Input to System)

• Measurement Current: 1 mA (RTD excitation)

• Temperature Drift: Max. 30 ppm/°C

• Weight: 0.2 kg

• External Connection: Pressure clamp terminal or MIL connector cable

Engineering Advantages

The NFAR181-S50 addresses specialized thermal monitoring challenges through refined electrical design:

• Precision Thermal Tracking: The module achieves an accuracy of ±0.15°C, making it suitable for sensitive chemical reactions and cryogenic storage where minute temperature deviations compromise product quality.

• Robust Signal Isolation: 1500 V AC isolation protects the controller logic from field-side electrical surges. This architecture prevents ground loops and localized interference from affecting the accuracy of adjacent channels.

• Integrated Burn-out Detection: Configurable burn-out detection identifies sensor failures or broken lead wires within 60 seconds. This proactive diagnostic feature prevents the control system from acting on erroneous data during a hardware fault.

• Lead Wire Compensation: The 3-wire configuration automatically compensates for lead wire resistance. This ensures high-accuracy readings even when sensors sit at a significant distance from the control cabinet.

• High Input Impedance: Maintaining 2 MΩ resistance regardless of power status ensures the module does not load the signal source, preserving measurement linearity throughout the entire temperature range.

FAQs

Q: Does the NFAR181-S50 support 2-wire or 4-wire Pt100 sensors?

A: The module specifically utilizes a 3-wire configuration to optimize lead wire compensation. While you can wire a 2-wire sensor by shorting the appropriate terminals, we recommend 3-wire sensors to maintain the rated ±0.15°C accuracy.

Q: How does the module indicate a sensor failure?

A: The module employs a configurable burn-out detection function. Upon detecting an open circuit (burn-out), the system triggers a diagnostic alarm within 60 seconds, allowing the controller to enter a pre-defined fail-safe mode.

Q: Can this module replace older STARDOM RTD modules?

A: The "S50" suffix represents the current hardware revision. It typically maintains backward compatibility with STARDOM FCN/FCJ controllers, but you should verify your existing software and baseplate version to ensure seamless integration.

Q: Is the unit shipped with a factory calibration certificate?

A: We provide every NFAR181-S50 in its 100% Brand New original Yokogawa packaging. The factory seals ensure the module retains its original calibration and passes all manufacturer quality-control benchmarks.