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Rosemount Thermowells










Mounting Styles

Consider process conditions and pipe or tank material to ensure the mounting style will be adequate for the application.


• Connection: Threaded into process pipe or tank
• Easy installation and removal
• Lowest pressure rating of the mounting configuration options




• Connection: Bolted to a mating flange on a process pipe or tank
• Manufacturing configurations: full and partial penetration welds
• Manufactured in accordance with ANSI B16.5
• Flange to stem weld is in accordance to ASME Section IX
• Full traceability with material certifications available on request



Van Stone
• Connection: Bolted to a mating flange on a process pipe or tank
• Unique design enables thermowell flange and stem materials to be different
• Eliminates weld-joint corrosion since there are no welds




• Connection: Permanently welded to a process pipe or tank
• Highest pressure rating and are generally used in applications with high velocity flow, high temperature, or extremely high pressure
• Leak-proof seal


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Stem Profile






The stem is the part of a thermowell inserted into the process piping or vessel. Factors to be considered when selecting a stem style include the process pressure, required response speed of the measurement, drag force of the fluid flow on the well, and the wake frequency.



• Diameter: Same along the entire immersion length
• Design: Strongest with largest profile to the process
• Drag: Highest compared to other styles with the same root diameter
• Response time: Slowest due to large tip diameter




• Diameter: Uniformly decreases from root to tip
• Design: Medium. Good compromise between straight and stepped thermowells
• Drag: Medium. Less than straight style, but greater than stepped style
• Response time: Average. Faster than straight style, and slower than stepped style




• Diameter: Two straight sections with the smaller diameter straight section at the tip
• Design: Least profile exposure to the flowing process
• Drag: Lowest of all styles
• Response time: Quickest due to the smaller tip

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