Omega Engineering SA2C-RTD-3-100-A-120 RTD Sensor Component with Leads - Class A Platinum Pt100, 4-Wire

The 4-wire configuration, also known as a true 4-wire RTD, uses two wires to supply a known excitation current to the sensor and two separate wires to measure the voltage drop across it. This method eliminates errors caused by the resistance of the lead wires themselves, which is critical for achieving the high accuracy specified by the Class A rating, especially over longer cable runs or in precision measurement systems.

The sensor features a pressure-sensitive adhesive backing. Ensure the target surface is clean, dry, and free of oils. Peel the protective liner and firmly press the sensor onto the surface, smoothing it out to eliminate air bubbles for optimal thermal contact. For high-temperature or permanent applications, supplemental mechanical fastening or high-temperature adhesive may be recommended by Omega Engineering.

While physically possible, using it with a 2-wire or 3-wire system will negate the accuracy benefit of the 4-wire design. For best performance, it must be connected to a 4-wire capable RTD input on a PLC, data logger, or temperature controller. If only 2/3-wire inputs are available, you must consult the instrument's manual for proper wiring adaptation, acknowledging a potential decrease in system accuracy.

Class A and Class B are tolerance classes defined by the IEC 60751 standard. Class A offers higher precision, with a tolerance of ±(0.15 + 0.002|t|)°C, where |t| is the absolute temperature value. Class B has a wider tolerance of ±(0.30 + 0.005|t|)°C. The SA2C-RTD-3-100-A-120's Class A rating makes it suitable for applications where measurement precision is critical, such as calibration, scientific research, and high-end process control.