Abstract
Environmental factors and electrical interference pose significant challenges to SPRT accuracy. This article examines thermal anchoring, lead resistance errors, and electromagnetic interference (EMI), offering practical mitigation strategies.

Issue 1: Poor Thermal Anchoring

Inadequate thermal contact between the SPRT and the measured medium leads to slow response times and temperature lag.

Solution

• Use thermally conductive paste or epoxy to enhance sensor-medium contact.

• Select SPRT sheaths with high thermal conductivity (e.g., stainless steel for corrosive environments).

Issue 2: Lead Resistance Errors

Long lead wires introduce additional resistance, distorting the measured voltage, especially in 2-wire configurations.

Solution

• Adopt 3-wire or 4-wire Kelvin connections to nullify lead resistance effects.

• Ensure uniform temperature distribution across leads to avoid thermoelectric offsets.

Issue 3: Electromagnetic Interference (EMI)

SPRT signals in industrial settings are vulnerable to EMI from motors, transformers, or RF sources, causing signal noise.

Solution

• Shield cables with braided copper or aluminum foil and ground the shield at one end.

• Use twisted-pair wiring to cancel induced magnetic fields.

• Integrate low-pass filters into data acquisition systems to suppress high-frequency noise.

Issue 4: Long-Term Stability in Harsh Environments

Exposure to oxidizing/reducing atmospheres or humidity can degrade SPRT performance over time.

Solution

• Deploy hermetically sealed SPRTs with inert gas (e.g., argon) filling.

• For high-humidity environments, use moisture-resistant sheaths (e.g., PTFE-coated).

Conclusion
Environmental robustness and advanced electrical configurations are essential for reliable SPRT operation in demanding conditions.