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Thermowells | coated thermowell

When Should I Use a Coated Thermowell?

By: Tino Goncalves, Temperature Product Manager
June 23rd, 2025

This article was originally published on May 9, 2022, and updated on June 23, 2025. In harsh process environments, even the most durable components can degrade over time—especially thermowells, which are your first line of defense for temperature sensors. Exposure to corrosive chemicals, high-velocity flow or abrasive media can wear down thermowells, risking measurement accuracy and system reliability. That’s where coated thermowells come in. As a trusted leader in temperature instrumentation, Ashcroft helps engineers extend equipment life and ensure process stability by offering different coatings for specific conditions. In this article, you’ll learn how thermowell coatings work, the different types available and how to choose the best option to protect both your instruments and your process.