Coated Thermowell

Thermowells are used to protect your temperature measurement instruments from the elements, which means they are often exposed to extreme environments and temperatures. Protecting the thermowell can help keep your temperature instruments safe and your application running.But how do you protect an instrument that’s designed to protect other instruments?A protective coating on your thermowell can help keep it safe in an application. This article will discuss coated thermowells and how they can be used to protect your process.

What is Thermowell Coating?

A coated thermowell can prevent contamination in critical applications and prolong the life of your thermowell. A coating can protect thermowells from corrosion, erosion and extreme temperatures.It can also prevent contamination in food/beverage and chemical applications that have strict sanitary requirements by helping to ensure the thermowell does not fail.What type of coating is best? There are a number of different coatings to choose from depending on your application.

Thermowell Coating Types :

PTFE and stellite are the most commonly used to protect thermowells.Perfluoroalkoxy (PFA) and Polytetrafluoroethylene (PTFE) coatings have similar properties. PFA and PTFE provide superior corrosion resistance in aggressive media, such as acid and corrosive processes. PFA and PTFE have several unique properties that make them suitable for use in chemical and medical applications.

PTFE and PFA :

• Working temperature from -200°C (-328°F) up to 260°C (500°F)
• Non-stick characteristics
• Low-friction surface
• Resistance to chemicals and solvents
• Protects against harsh environmental conditions
• Biocompatibility

Stellite  :

Stellite coating in thermowells is applied through thermal spraying. It is a rugged coating made from a group of alloys that contain cobalt-chromium and other materials such as tungsten carbide, aluminum oxide, molybdenum and carbon. These metals are specially designed to resist corrosion, high wear and high temperatures, along with abrasive media such as sand or other particles.