YOKOGAWA SC200S

Description

YOKOGAWA SC200S is a single-channel signal conditioner or isolating transmitter designed to convert, isolate, and transmit various field sensor signals into a standard process signal. This module from Yokogawa is part of their line of DIN-rail mounted signal conditioning equipment, providing essential interface functionality between field devices and control systems. Detailed technical specifications can be found on the product page: YOKOGAWA SC200S. The YOKOGAWA SC200S ensures signal integrity, provides electrical isolation, and enables reliable data acquisition in industrial measurement and control loops.

Product Description

The YOKOGAWA SC200S is a compact, single-function signal conditioning module. It is designed to accept a specific type of input signal from a field sensor—such as a thermocouple (TC), resistance temperature detector (RTD), strain gauge, DC voltage, or DC current—and convert it into a standardized, isolated output signal, typically 4-20 mA or 0-10 V DC. The SC200S provides galvanic isolation between its input, output, and power supply circuits. This isolation is critical for breaking ground loops, suppressing electromagnetic interference (EMI), and protecting sensitive control system equipment from voltage spikes or faults originating in the field. As a dedicated, single-channel unit, the YOKOGAWA SC200S offers a focused and reliable solution for point-to-point signal conditioning.

Product Parameters

• Brand and Manufacturer: YOKOGAWA.
• Product Type: Single-Channel Signal Conditioner / Isolator.
• Input Signal: Configurable for specific sensor types. Common options include:
  • Thermocouples (Types J, K, T, E, etc.)
  • RTDs (2-wire, 3-wire, or 4-wire Pt100)
  • DC Voltage (e.g., 0-5V, 0-10V)
  • DC Current (e.g., 4-20 mA, for signal isolation/re-transmission)
• Output Signal: Typically a single, isolated 4-20 mA or 0-10V DC signal.
• Isolation: High-performance galvanic isolation (e.g., 1500 V AC) between input, output, and power supply.
• Accuracy: High accuracy class (e.g., ±0.1% of span) for precise signal conversion.
• Power Supply: Requires an external DC or AC power supply (e.g., 24V DC or 85-264V AC) for module operation.
• Response Time: Fast response time suitable for dynamic process signals.
• Ambient Temperature Range: Rated for operation in standard industrial temperature ranges.
• Mounting: Standard DIN-rail mounting (TH35-7.5 or similar).

Advantages and Features

The primary advantage of the YOKOGAWA SC200S is its ability to provide clean, accurate, and reliable signal conversion from a wide array of sensors, thanks to Yokogawa’s expertise in measurement technology. Its robust isolation protects downstream controllers, PLCs, and data acquisition systems from damage. The module is highly reliable, maintenance-free, and designed for long-term stability, reducing calibration frequency. A key feature is its simplicity and focused design; being a single-channel device, it avoids the complexity of multi-channel configurators and is easy to specify, wire, and replace. The compact DIN-rail form factor of the YOKOGAWA SC200S allows for high-density installations in control panels.

Application Cases in Various Fields

• Temperature Measurement in Hazardous Areas: Isolating a thermocouple signal from a furnace or reactor before sending it to a safe-area control room, often as part of an intrinsic safety (IS) barrier system.
• Motor and Pump Monitoring: Conditioning signals from vibration sensors, pressure transmitters, or RTDs embedded in motor windings for predictive maintenance systems.
• PLC and DCS Interface: Converting non-standard sensor outputs (e.g., 0-5V from a load cell) into a standard 4-20 mA signal for input into a PLC analog input card.
• Ground Loop Elimination: Breaking ground loops caused by differences in earth potential between a field sensor and the control system, which manifest as signal noise or drift.
• Signal Re-transmission: Taking a 4-20 mA loop-powered transmitter signal, isolating it, and generating a new, independent 4-20 mA output to feed two different receiving devices (e.g., a local indicator and a remote controller).

Comparison with Competing Products

Compared to similar single-channel isolators from manufacturers like Phoenix Contact (MINI Analog series), Weidmüller (SAI series), or PR electronics, the YOKOGAWA SC200S is positioned as a high-accuracy, premium solution from a world leader in process instrumentation. While competitors offer comparable isolation and function, the SC200S often excels in its measurement accuracy, long-term drift specifications, and build quality. It is a strong choice for critical measurement points where signal fidelity is paramount. For less critical applications or where cost is a major driver, the competitors’ products may be suitable alternatives. The YOKOGAWA SC200S is often preferred in industries and plants with a significant installed base of Yokogawa systems.

Selection Suggestions and Precautions

1. Define Input and Output Precisely: The SC200S is ordered for a specific input type (e.g., K-type thermocouple) and output (e.g., 4-20 mA). You must specify these correctly at the time of purchase.
2. Power Supply Requirement: Ensure you have the correct power supply available (e.g., 24V DC) to power the module. Some variants may accept a wide AC range.
3. Wiring and Termination: Follow the terminal diagram precisely. For RTDs, use the correct 2-, 3-, or 4-wire connection method to minimize lead resistance errors. Use shielded cables for analog signals.
4. Consider the Environment: While industrially rated, avoid installing the module in areas of extreme heat, vibration, or corrosive atmospheres unless specifically rated for it.
5. Calibration and Verification: Although stable, initial calibration verification after installation is good practice. Ensure the input sensor itself is properly calibrated.

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