PT100 A-class Temperature Sensor 4x30mm 1.5M Cable - 4-Wire RTD Probe

This sensor meets the IEC 60751 Class A (F0.15) standard, which specifies a tighter tolerance (±0.15°C at 0°C) compared to Class B (±0.30°C at 0°C). Class A is used for high-precision applications where measurement accuracy is critical, such as in laboratory calibration or precise process control.

While physically possible, using a 4-wire sensor with a 2 or 3-wire instrument will negate its primary accuracy advantage. The 4-wire configuration is designed to cancel out lead resistance errors. For optimal performance, it should be connected to a compatible 4-wire RTD input or transmitter. If used otherwise, accuracy may degrade to the level of a lower-class sensor.

The probe is rated for continuous operation from -50°C to +200°C. The SUS304 stainless steel sheath provides corrosion resistance and durability in liquids, gases, and industrial atmospheres. It features high vibration and shock resistance, making it suitable for harsh environments like machinery monitoring, but it is not recommended for direct, prolonged flame impingement or highly caustic chemicals beyond the material's standard corrosion limits.

The four wires are typically paired: two are for the excitation current (I+, I-), and two are for sensing the voltage drop across the RTD (V+, V-). Connect these leads to the corresponding terminals on a 4-wire RTD input module, PLC, or transmitter. Ensure the instrument provides a measuring current within the sensor's specified range of 0.3 to 1.0 mA to avoid self-heating errors.