--- title: When Should I Use a Coated Thermowell? description: Learn when and why to use coated thermowells to protect your temperature measurement instruments from corrosion, erosion, and extreme temperatures. image: https://blog.ashcroft.com/hubfs/Repost-CoatedTW_BLOG_V1.jpg --- [Skip to main content](https://blog.ashcroft.com/when-to-use-a-coated-thermowell#maincontent) Select Region - [US & Canada](https://ashcroft.com) - [Europe](https://ashcroft.eu/) - [China](http://www.ashcroft.com.cn/) - [Mexico & Central America](http://www.ashcroft.com.mx/) - [South America](https://ashcroftsudamericana.com/) - [Brazil](https://ashcroft.com.br/) Login - [Distributor Extranet](https://extranet.ashcroft.com/) - [Product Configurator](https://www.ashcroft.com/my-account/) [Careers](https://www.ashcroft.com/careers) [Contact](https://www.ashcroft.com/contact/) [![ashcroft-logo-lg-2](https://blog.ashcroft.com/hs-fs/hubfs/ashcroft-logo-lg-2.png?width=261&height=60&name=ashcroft-logo-lg-2.png) ![ashcroft-logo-white](https://blog.ashcroft.com/hubfs/assets/images/ashcroft-logo-white.svg)](https://www.ashcroft.com/) Products Pressure Instruments - [Pressure Gauges](https://www.ashcroft.com/products/pressure/pressure-gauges) - [Pressure Switches](https://www.ashcroft.com/products/pressure/pressure-switches) - [Pressure Sensors (Transducers/Transmitters)](https://www.ashcroft.com/products/pressure/pressure-sensors) - [Diaphragm Seals-Isolators](https://www.ashcroft.com/products/pressure/diaphragm-seals-and-isolators) - [Accessories](https://www.ashcroft.com/products/pressure/accessories) - [SMART Transmitter Assemblies](https://www.ashcroft.com/products/pressure/smart-transmitter-assemblies) Temperature Instruments - [Thermometers](https://www.ashcroft.com/products/temperature/thermometers) - [Thermowells](https://www.ashcroft.com/products/temperature/thermowells) - [Temperature Switches](https://www.ashcroft.com/products/temperature/temperature-switches) - [RTDs](https://www.ashcroft.com/products/temperature/rtds) - [Thermocouples](https://www.ashcroft.com/products/temperature/thermocouples) - [Temperature Transmitters](https://www.ashcroft.com/products/temperature/temperature-transmitters/) - [MultiPoint Temperature Sensors](https://www.ashcroft.com/products/temperature/multipoint-temperature-sensors/) - [OEM Temperature Sensors](https://www.ashcroft.com/products/temperature/oem-temperature-sensors) Test Instruments - [Calibrators](https://www.ashcroft.com/products/test-instruments/calibrators/) - [Hand Pumps-Controllers](https://www.ashcroft.com/products/test-instruments/hand-pumps-and-controllers/) - [Hydraulic Testers](https://www.ashcroft.com/products/test-instruments/hydraulic-testers/) - [Test Gauges](https://www.ashcroft.com/products/test-instruments/test-gauges/) Helpful Tools - [Product Documentation](https://www.ashcroft.com/learn/product-documentation/) - [Product & Quality Certifications](https://www.ashcroft.com/about/quality-certifications/) - [Material Selector & Corrosion Guide](https://www.ashcroft.com/webtools/materialselector/) - [Unit Converter](https://www.ashcroft.com/webtools/calculatoruom/) - [Wake Frequency Calculator](https://www.ashcroft.com/webtools/calculatorwf/) - [FAQs](https://www.ashcroft.com/faq/) Keep your critical equipment and processes running with reliable pressure and temperature measurements. [Configure Product Part Number](https://www.ashcroft.com/product-configurator) [Get a Quote](https://www.ashcroft.com/quote) Industries Process Industry Overview - [Solutions for the Process Industry](https://www.ashcroft.com/solutions/process-industry-instrumentation) - [Large Projects/EPC](https://www.ashcroft.com/solutions/process-industry-instrumentation/engineering-procurement-construction-large-projects/) - [Critical Application Solution Experts](https://www.ashcroft.com/solutions/process-industry-instrumentation/critical-application-solution-experts/) - [Distributor Locator](https://www.ashcroft.com/ashcroft-distributors/) Process Industry Solutions - [Chemical & Petrochemical](https://www.ashcroft.com/solutions/process-industry-instrumentation/chemical-process-instrumentation/) - [Food & Beverage](https://www.ashcroft.com/solutions/process-industry-instrumentation-sensors/food-beverage/) - [Metals & Minerals](https://www.ashcroft.com/solutions/process-industry-instrumentation/mining-instruments/) - [Oil & Gas](https://www.ashcroft.com/solutions/process-industry-instrumentation/oil-gas-instrumentation/) - [Pharmaceutical & Biotech](https://www.ashcroft.com/solutions/process-industry-instrumentation/pharmaceutical-and-biotechnology-application-solutions/) - [Power](https://www.ashcroft.com/solutions/process-industry-instrumentation/power-plant-instrumentation/) - [Water & Wastewater](https://www.ashcroft.com/solutions/process-industry-instrumentation/instruments-used-in-water-treatment-plant/) Industrial/OEM Markets Overview - [Solutions for Industrial OEM](https://www.ashcroft.com/solutions/industrial-oem/) - [Custom Engineered Solutions (CES)](https://www.ashcroft.com/solutions/industrial-oem-custom-engineered-solutions/) Industrial/OEM Markets - [HVAC/R](https://www.ashcroft.com/solutions/industrial-oem/hvac-refrigeration-equipment/) - [Hydrogen & Alternative Energu](https://www.ashcroft.com/solutions/industrial-oem/hydrogen-alternative-energy/) - [Industrial Equipment Manufacturer](https://www.ashcroft.com/solutions/industrial-oem/industrial-equipment-manufacturer-supplier/) - [Medical Health & Safety](https://www.ashcroft.com/solutions/industrial-oem/medical-biotechnology-instruments/) - [Process Equipment Manufacturer](https://www.ashcroft.com/solutions/industrial-oem/process-equipment-manufacturer/) - [Semiconductor](https://www.ashcroft.com/solutions/industrial-oem/ultra-high-purity-gas-delivery-semiconductor-manufacturing/) - [Vehicles](https://www.ashcroft.com/solutions/industrial-oem/vehicles-working-machines/) Resources - [Product Documentations](https://www.ashcroft.com/learn/product-documentation/) - [Educational Resources](https://www.ashcroft.com/learn/resource-center/) About - [About](https://www.ashcroft.com/about/) - [Corporate Responsibility](https://www.ashcroft.com/about/corporate-responsibility/) - [Code of Conduct](https://www.ashcroft.com/about/corporate-responsibility/code-of-conduct/) - [Trade Compliance](https://www.ashcroft.com/about/corporate-responsibility/trade-compliance/) - [Product Stewardship](https://www.ashcroft.com/about/corporate-responsibility/product-stewardship/) - [Company News & Events](https://www.ashcroft.com/news-events/) - [Leadership Team](https://www.ashcroft.com/about/leadership/) - [Brands & Trademarks](https://www.ashcroft.com/about/brands-trademarks/) - [Careers](https://www.ashcroft.com/careers/) [Get a Quote](https://sales.ashcroft.com/quote) Products Products [Pressure Instruments](https://www.ashcroft.com) Pressure Instruments [Pressure Gauges](https://www.ashcroft.com/products/pressure/pressure-gauges) [Pressure Switches](https://www.ashcroft.com/products/pressure/pressure-switches) [Pressure Sensors (Transducers/Transmitters)](https://www.ashcroft.com/products/pressure/pressure-sensors) [Diaphragm Seals-Isolators](https://www.ashcroft.com/products/pressure/diaphragm-seals-and-isolators) [Accessories](https://www.ashcroft.com/products/pressure/accessories) [SMART Transmitter Assemblies](https://www.ashcroft.com/products/pressure/smart-transmitter-assemblies) [Temperature Instruments](https://www.ashcroft.com) Temperature Instruments [Thermometers](https://www.ashcroft.com/products/temperature/thermometers) [Thermowells](https://www.ashcroft.com/products/temperature/thermowells) [Temperature Switches](https://www.ashcroft.com/products/temperature/temperature-switches) [RTDs](https://www.ashcroft.com/products/temperature/rtds) [Thermocouples](https://www.ashcroft.com/products/temperature/thermocouples) [Temperature Transmitters](https://www.ashcroft.com/products/temperature/temperature-transmitters/) [MultiPoint Temperature Sensors](https://www.ashcroft.com/products/temperature/multipoint-temperature-sensors/) [OEM Temperature Sensors](https://www.ashcroft.com/products/temperature/oem-temperature-sensors) [Test Instruments](https://www.impactplus.com) Test Instruments [Calibrators](https://www.ashcroft.com/products/test-instruments/calibrators/) [Hand Pumps-Controllers](https://www.ashcroft.com/products/test-instruments/hand-pumps-and-controllers/) [Hydraulic Testers](https://www.ashcroft.com/products/test-instruments/hydraulic-testers/) [Test Gauges](https://www.ashcroft.com/products/test-instruments/test-gauges/) [Helpful Tools](https://www.impactplus.com) Helpful Tools [Product Documentation](https://www.ashcroft.com/learn/product-documentation/) [Product & Quality Certifications](https://www.ashcroft.com/about/quality-certifications/) [Material Selector & Corrosion Guide](https://www.ashcroft.com/webtools/materialselector/) [Unit Converter](https://www.ashcroft.com/webtools/calculatoruom/) [Wake Frequency Calculator](https://www.ashcroft.com/webtools/calculatorwf/) [FAQs](https://www.ashcroft.com/faq/) Industries Industries [Process Industry Overview](https://www.impactplus.com) Process Industry Overview [Solutions for the Process Industry](https://www.ashcroft.com/solutions/process-industry-instrumentation) [Large Projects/EPC](https://www.ashcroft.com/solutions/process-industry-instrumentation/engineering-procurement-construction-large-projects/) [Critical Application Solution Experts](https://www.ashcroft.com/solutions/process-industry-instrumentation/critical-application-solution-experts/) [Distributor Locator](https://www.ashcroft.com/ashcroft-distributors/) [Process Industry Solutions](https://www.impactplus.com) Process Industry Solutions [Chemical & Petrochemical](https://www.ashcroft.com/solutions/process-industry-instrumentation/chemical-process-instrumentation/) [Food & Beverage](https://www.ashcroft.com/solutions/process-industry-instrumentation-sensors/food-beverage/) [Metals & Minerals](https://www.ashcroft.com/solutions/process-industry-instrumentation/mining-instruments/) [Oil & Gas](https://www.ashcroft.com/solutions/process-industry-instrumentation/oil-gas-instrumentation/) [Pharmaceutical & Biotech](https://www.ashcroft.com/solutions/process-industry-instrumentation/pharmaceutical-and-biotechnology-application-solutions/) [Power](https://www.ashcroft.com/solutions/process-industry-instrumentation/power-plant-instrumentation/) [Water & Wastewater](https://www.ashcroft.com/solutions/process-industry-instrumentation/instruments-used-in-water-treatment-plant/) [Industrial/OEM Markets Overview](https://www.impactplus.com) Industrial/OEM Markets Overview [Solutions for Industrial OEM](https://www.ashcroft.com/solutions/industrial-oem/) [Custom Engineered Solutions (CES)](https://www.ashcroft.com/solutions/industrial-oem-custom-engineered-solutions/) [Industrial/OEM Markets](https://www.impactplus.com) Industrial/OEM Markets [HVAC/R](https://www.ashcroft.com/solutions/industrial-oem/hvac-refrigeration-equipment/) [Hydrogen & Alternative Energu](https://www.ashcroft.com/solutions/industrial-oem/hydrogen-alternative-energy/) [Industrial Equipment Manufacturer](https://www.ashcroft.com/solutions/industrial-oem/industrial-equipment-manufacturer-supplier/) [Medical Health & Safety](https://www.ashcroft.com/solutions/industrial-oem/medical-biotechnology-instruments/) [Process Equipment Manufacturer](https://www.ashcroft.com/solutions/industrial-oem/process-equipment-manufacturer/) [Semiconductor](https://www.ashcroft.com/solutions/industrial-oem/ultra-high-purity-gas-delivery-semiconductor-manufacturing/) [Vehicles](https://www.ashcroft.com/solutions/industrial-oem/vehicles-working-machines/) Resources Resources [Product Documentations](https://www.ashcroft.com/learn/product-documentation/) [Educational Resources](https://www.ashcroft.com/learn/resource-center/) About About [About](https://www.ashcroft.com/about/) [Corporate Responsibility](https://www.ashcroft.com/about/corporate-responsibility/) [Code of Conduct](https://www.ashcroft.com/about/corporate-responsibility/code-of-conduct/) [Trade Compliance](https://www.ashcroft.com/about/corporate-responsibility/trade-compliance/) [Product Stewardship](https://www.ashcroft.com/about/corporate-responsibility/product-stewardship/) [Company News & Events](https://www.ashcroft.com/news-events/) [Leadership Team](https://www.ashcroft.com/about/leadership/) [Brands & Trademarks](https://www.ashcroft.com/about/brands-trademarks/) [Careers](https://www.ashcroft.com/careers/) Select Region Select Region [US & Canada](https://ashcroft.com) [Europe](https://ashcroft.eu/) [China](http://www.ashcroft.com.cn/) [Mexico & Central America](http://www.ashcroft.com.mx/) [South America](https://ashcroftsudamericana.com/) [Brazil](https://ashcroft.com.br/) Login Login [Distributor Extranet](https://extranet.ashcroft.com/) [Product Configurator](https://www.ashcroft.com/my-account/) [Careers](https://www.ashcroft.com/careers) [Contact](https://www.ashcroft.com/contact/) [Get a Quote](https://sales.ashcroft.com/quote) [«  View All Articles](https://blog.ashcroft.com/) ![Tino Goncalves, Product Sales Manager's headshot](https://blog.ashcroft.com/hs-fs/hubfs/Tino%20headshot.jpg?width=50&height=50&name=Tino%20headshot.jpg) **By:** [Tino Goncalves](https://blog.ashcroft.com/author/tino-goncalves) Product Sales Manager **Published on:** June 23rd, 2025 **Topics:** [Thermowells](https://blog.ashcroft.com/topic/thermowells) [coated thermowell](https://blog.ashcroft.com/topic/coated-thermowell) **Share:** [mailto:?subject=When+Should+I+Use+a+Coated+Thermowell%3F&body=https://blog.ashcroft.com/when-to-use-a-coated-thermowell](mailto:?subject=When+Should+I+Use+a+Coated+Thermowell%3F&body=https://blog.ashcroft.com/when-to-use-a-coated-thermowell) Subscribe Never miss a blog post! Subscribe now and get the latest blog posts delivered straight to your inbox. # When Should I Use a Coated Thermowell? Print/Save as PDF ![Tino Goncalves, Product Sales Manager's headshot](https://blog.ashcroft.com/hs-fs/hubfs/Tino%20headshot.jpg?width=50&height=50&name=Tino%20headshot.jpg) **By:** [Tino Goncalves](https://blog.ashcroft.com/author/tino-goncalves) Product Sales Manager **Published on:** June 23rd, 2025 **Topics:** [Thermowells](https://blog.ashcroft.com/topic/thermowells) [coated thermowell](https://blog.ashcroft.com/topic/coated-thermowell) **Share:** [mailto:?subject=When+Should+I+Use+a+Coated+Thermowell%3F&body=https://blog.ashcroft.com/when-to-use-a-coated-thermowell](mailto:?subject=When+Should+I+Use+a+Coated+Thermowell%3F&body=https://blog.ashcroft.com/when-to-use-a-coated-thermowell) ![](https://blog.ashcroft.com/hs-fs/hubfs/Repost-CoatedTW_BLOG_V1.jpg?width=1600&height=534&name=Repost-CoatedTW_BLOG_V1.jpg) *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. ## What is Thermowell Coating? A coated thermowell can protect against contamination in critical applications and prolong the life of your thermowell. It can also help prevent contamination in [food/beverage](https://www.ashcroft.com/solutions/process-industry-instrumentation-sensors/food-beverage/) and [chemical applications](https://www.ashcroft.com/solutions/process-industry-instrumentation/chemical-process-instrumentation/) that have strict sanitary requirements by helping to ensure the thermowell does not fail. A coated thermowell is a standard thermowell (commonly 316 SS) enhanced with an engineered protective layer to prevent contamination in critical applications and prolong the life of your thermowell. This added coating provides a barrier against threats, including: - **Corrosive chemicals:** acids, alkalis, solvents - **Abrasive particles:** steam-entrained solids, mineral slurries - **Cross-contamination:** critical in food, beverage, and pharmaceutical processes ## Types of Thermowell Coating Types There are a number of different coatings to choose from depending on your application. PFA/PTFE and stellite are the most commonly used to protect thermowells, here is a quick review of both types:  1\. Perfluoroalkoxy (PFA) and Polytetrafluoroethylene (PTFE) Coatings [PFA](https://en.wikipedia.org/wiki/Perfluoroalkoxy_alkane) and [PTFE ](https://en.wikipedia.org/wiki/Polytetrafluoroethylene)options are similar in that they both involve fluoropolymer layers that are applied to the thermowell through dipping or spraying. They offer excellent chemical resistance, a low friction and non-stick surface and a wide temperature range of 200 °C to +260 °C (–328 °F to +500 °F). Plus, they are biocompatible and FDA-compliant, making them ideal choices for aggressive chemical processes, pharmaceuticals, food & beverage and sanitary applications. 2\. Stellite (Hard Alloy) Coatings This [stellite](https://www.stellite.com/us/en/home.html) coating option is thermal-sprayed cobalt‑chromium alloy, which is often blended with tungsten carbide or aluminum oxide. It offers exceptional wear resistance as well as high resistance to erosion and abrasion, and it is sturdy against mechanical shock and high-temperature durability. For those reasons and more, stellite coatings are often used in abrasive slurry flows, high-velocity steam, mining environments and sand applications.  Choosing the Right Thermowell Coating for Your Needs *Figure 1: Thermowell coatings by application* ![Thermowell coating-1](https://blog.ashcroft.com/hs-fs/hubfs/Thermowell%20coating-1.png?width=813&height=193&name=Thermowell%20coating-1.png) ## Benefits of Using a Coated Thermowell Choosing the right thermowell coating protects your equipment and delivers several long-term operational advantages. - **Extended service life** in corrosive or abrasive environments - **Reliable temperature readings**, thanks to environmental protection - **Sanitary, food-safe operations** with PTFE or FDA-grade coatings - **Cost-effective option** for reducing sensor and equipment replacement costs ## How to Order a Coated Thermowell Ashcroft offers coating options for all thermowell configurations. Before you [request a quote](https://sales.ashcroft.com/quote), take a moment to: 1. **Assess** your application conditions – identify media type, temperature, flow and abrasion factors. 2. **Select** compatible thermowell material, typically 316 SS; consider exotic metals if needed. 3. **Choose** the right coating layer, balancing chemical and mechanical requirements. 4. **Consult** Ashcroft’s experts for optimal coating thickness, application methods, and lead times. ## Ready to Learn More? Now that you understand the purpose of a coated thermowell and when it’s appropriate to use one, you will be able to ensure that your temperature measurement equipment remains safe in your application.  The following articles may provide answers to additional questions you may have about thermowells:  - [How to Calculate Thermowell Stem Length for your Temperature Instrument ](https://blog.ashcroft.com/how-to-calculate-thermowell-stem-length-for-temperature-sensors) - [Fitting a Thermowell to Bimetal Thermometers or RTDs/Thermocouples](https://blog.ashcroft.com/fitting-a-thermowell-to-bimetal-thermometers-or-rtds-thermocouples) - [What is a Thermowell Wake Frequency Calculation?](https://blog.ashcroft.com/thermowell-wake-frequency) - [How Much Do Thermowells Cost? 5 Factors that Influence Price](https://blog.ashcroft.com/blog/thermowell-cost) [Contact us](https://www.ashcroft.com/contact/) anytime to speak to a product specialist who can answer any additional questions you have. In the meantime, download our guide for help choosing instruments for highly corrosive and harsh oil and gas applications.  [![Chemical Industry Solutions](https://no-cache.hubspot.com/cta/default/4021582/9daee096-8b41-4552-b863-bb52e4f1a799.png)](https://cta-redirect.hubspot.com/cta/redirect/4021582/9daee096-8b41-4552-b863-bb52e4f1a799) [Tino Goncalves, Product Sales Manager](https://blog.ashcroft.com/author/tino-goncalves) Tino is the Product Sales Manager here at Ashcroft. He has over 20 years of experience in test and measurement instruments and holds a Bachelor of Science in management and electrical engineering. Connect: [mailto:tino.goncalves@ashcroft.com](mailto:tino.goncalves@ashcroft.com) Topics: [Thermowells](https://blog.ashcroft.com/topic/thermowells) [coated thermowell](https://blog.ashcroft.com/topic/coated-thermowell) Don't forget to share this post: ## Related Articles ### [![](https://blog.ashcroft.com/hs-fs/hubfs/Types_TW_BLOG_TempTues.jpg?width=1600&height=534&name=Types_TW_BLOG_TempTues.jpg) When to Use Straight, Tapered or Stepped Thermowells August , 2025|4 min. read](https://blog.ashcroft.com/when-to-use-straight-tapered-or-stepped-thermowells) ### [![](https://blog.ashcroft.com/hs-fs/hubfs/Repost_TW_TC_Bi_BLOG_V1.jpg?width=1600&height=534&name=Repost_TW_TC_Bi_BLOG_V1.jpg) How to Fit a Thermowell to Bimetal Thermometers, Thermocouples and RTDs June , 2025|4 min. read](https://blog.ashcroft.com/fitting-a-thermowell-to-bimetal-thermometers-or-rtds-thermocouples) ### [![Bimetal Thermometer Cost Factors](https://blog.ashcroft.com/hs-fs/hubfs/BiMetalCost_BLOG_V2.jpg?width=1600&height=534&name=BiMetalCost_BLOG_V2.jpg) How Much Do Industrial Bimetal Thermometers Cost? March , 2025|3 min. read](https://blog.ashcroft.com/bimetal-thermometer-cost) ### [![](https://blog.ashcroft.com/hs-fs/hubfs/WakeFreq_BLOG_V1.jpg?width=1600&height=534&name=WakeFreq_BLOG_V1.jpg) What is a Thermowell Wake Frequency Calculation? March , 2025|3 min. read](https://blog.ashcroft.com/thermowell-wake-frequency) ### [![](https://blog.ashcroft.com/hs-fs/hubfs/Repost_TW_Cost_BLOG_V1-1.jpg?width=1600&height=534&name=Repost_TW_Cost_BLOG_V1-1.jpg) How Much Do Thermowells Cost? 5 Factors that Influence Price February , 2025|4 min. read](https://blog.ashcroft.com/blog/thermowell-cost) ### [![](https://blog.ashcroft.com/hs-fs/hubfs/Basics.BLOG_12-18-24.jpg?width=1600&height=534&name=Basics.BLOG_12-18-24.jpg) Which RTD & Thermocouple Lag Extension is right for me? December , 2024|3 min. read](https://blog.ashcroft.com/rtd-thermocouple-lag-types) ### [![](https://blog.ashcroft.com/hs-fs/hubfs/Thermo_BiMetal_BLOG_RevA_V3.jpg?width=1600&height=534&name=Thermo_BiMetal_BLOG_RevA_V3.jpg) How to Calculate Thermowell Stem Length for Temperature Instruments October , 2024|4 min. read](https://blog.ashcroft.com/how-to-calculate-thermowell-stem-length-for-temperature-sensors) ### [![Vortex Thermowell](https://blog.ashcroft.com/hs-fs/hubfs/Repost-Vortex_BLOG.jpg?width=1600&height=534&name=Repost-Vortex_BLOG.jpg) When Should You Use a Vortex Thermowell? March , 2024|4 min. read](https://blog.ashcroft.com/vortex-thermowell) ### [![What is a Thermowell?](https://blog.ashcroft.com/hs-fs/hubfs/Basics.BLOG_Thermowell-1-31-24.jpg?width=3333&height=1113&name=Basics.BLOG_Thermowell-1-31-24.jpg) What is a Thermowell? January , 2024|4 min. read](https://blog.ashcroft.com/what-is-a-thermowell) ![https://f.hubspotusercontent30.net/hubfs/4021582/assets/images/ashcroft-logo-white.svg](https://blog.ashcroft.com/hubfs/assets/images/ashcroft-logo-white.svg) 250 East Main Street Stratford, CT 06614 [800.328.8258](tel:+1800.328.8258) [Contact](https://www.ashcroft.com/contact/) [Learning Center](https://www.ashcroft.com/learn/resource-center) [Blog](https://blog.ashcroft.com/) [Subscribe to Blog](https://sales.ashcroft.com/ashcroft-blog-subscribe) [Facebook](https://www.facebook.com/AshcroftInc) [Instagram](https://www.instagram.com/ashcroftinc/) [LinkedIn](https://www.linkedin.com/company/ashcroft-inc-/) [YouTube](https://www.youtube.com/user/AshcroftInc) [PRODUCTS](https://www.ashcroft.com/products) - [Pressure Instruments](https://www.ashcroft.com/products/#pressure) - [Temperature Instruments](https://www.ashcroft.com/products/#temperature) - [Test Instruments](https://www.ashcroft.com/products/#test-instruments) - [Product Configurator](https://www.ashcroft.com/product-configurator/) - [Product Documentation](https://www.ashcroft.com/learn/product-documentation) - [Pressure Gauge Selection Tool](https://www.ashcroft.com/pressure-gauge-selection-tool/) - [Product & Quality Certifications](https://www.ashcroft.com/about/quality-certifications/) PROCESS INDUSTRY - [Overview](https://www.ashcroft.com/solutions/process-industry-instrumentation/) - [Large Projects/EPC](https://www.ashcroft.com/solutions/process-industry-instrumentation/engineering-procurement-construction-large-projects/) - [Critical Application Solutions Experts (CASE)](https://www.ashcroft.com/solutions/process-industry-instrumentation/critical-application-solution-experts/) - [Distributor Locator](https://www.ashcroft.com/ashcroft-distributors/) INDUSTRIAL/OEM - [Overview](https://www.ashcroft.com/solutions/industrial-oem/) - [Custom Engineered Solutions (CES)](https://www.ashcroft.com/solutions/industrial-oem-custom-engineered-solutions/) COMPANY - [About](https://www.ashcroft.com/about/) - [Corporate Responsibility](https://www.ashcroft.com/about/corporate-responsibility/) - [Code of Conduct](https://www.ashcroft.com/about/corporate-responsibility/code-of-conduct/) - [Trade Compliance](https://www.ashcroft.com/about/corporate-responsibility/trade-compliance/) - [Product Stewardship](https://www.ashcroft.com/about/corporate-responsibility/product-stewardship/) - [Company News & Events](https://www.ashcroft.com/news-events/) - [Careers](https://www.ashcroft.com/careers/) - [Contact](https://www.ashcroft.com/contact/) © 2026 Ashcroft Inc.. All Rights Reserved. [Privacy Statement](https://www.ashcroft.com/privacy-policy/) | [Legal Disclaimer](https://www.ashcroft.com/disclaimer) | [Supplier Terms of Purchase](https://www.ashcroft.com/wp-content/uploads/2026/07/ashcroft-purchase-order-terms-conditions-revh-july26.pdf) | [Terms of Sales](https://www.ashcroft.com/wp-content/uploads/2023/08/terms-of-sale-ashcroft.pdf) | [Privacy Policy](https://www.ashcroft.com) ```json { "@context" : "https://schema.org", "@id" : "https://blog.ashcroft.com/#website", "@type" : "WebSite", "inLanguage" : "en-US", "name" : "Ashcroft Inc.", "potentialAction" : { "@type" : "SearchAction", "query-input" : "required name=search_term_string", "target" : "https://blog.ashcroft.com/search?term={search_term_string}" }, "publisher" : { "@id" : "https://blog.ashcroft.com/#organization" }, "url" : "https://blog.ashcroft.com" } ``` ```json { "@context" : "https://schema.org", "@id" : "https://blog.ashcroft.com/#organization", "@type" : "Organization", "address" : { "@type" : "PostalAddress", "addressCountry" : "US", "addressLocality" : "Stratford", "addressRegion" : "CT", "postalCode" : "06614", "streetAddress" : "250 East Main Street" }, "image" : { "@id" : "https://blog.ashcroft.com/#logo" }, "logo" : { "@id" : "https://blog.ashcroft.com/#logo", "@type" : "ImageObject", "caption" : "Ashcroft Logo", "contentUrl" : "https://4021582.fs1.hubspotusercontent-na1.net/hubfs/4021582/social-suggested-images/sales.ashcroft.comhs-fshubfsashcroft-logo-lg-2.png", "height" : 45, "inLanguage" : "en-US", "url" : "https://4021582.fs1.hubspotusercontent-na1.net/hubfs/4021582/social-suggested-images/sales.ashcroft.comhs-fshubfsashcroft-logo-lg-2.png", "width" : 200 }, "name" : "Ashcroft Inc.", "sameAs" : [ "https://www.facebook.com/AshcroftInc", "https://www.instagram.com/ashcroftinc/", "https://www.linkedin.com/company/ashcroft-inc-/", "https://www.youtube.com/user/AshcroftInc" ], "telephone" : "+18003288258", "url" : "https://blog.ashcroft.com" } ``` ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Tino Goncalves, Product Sales Manager", "url" : "https://blog.ashcroft.com/author/tino-goncalves" }, "dateCreated" : "2022-05-03T17:33:45", "datePublished" : "2025-06-23T11:00:00-0400", "description" : "Learn when and why to use coated thermowells to protect your temperature measurement instruments from corrosion, erosion, and extreme temperatures.", "headline" : "When Should I Use a Coated Thermowell?", "image" : [ "https://4021582.fs1.hubspotusercontent-na1.net/hubfs/4021582/Repost-CoatedTW_BLOG_V1.jpg" ], "inLanguage" : "en", "keywords" : [ "Thermowells", "coated thermowell" ], "learningResourceType" : "article", "name" : "When Should I Use a Coated Thermowell?", "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://4021582.fs1.hubspotusercontent-na1.net/hubfs/4021582/social-suggested-images/sales.ashcroft.comhs-fshubfsashcroft-logo-lg-2.png" }, "name" : "Ashcroft Inc." }, "timeRequired" : "PT2M", "url" : "https://blog.ashcroft.com/when-to-use-a-coated-thermowell" } ```