Rosemount™ Thermowells

Meet process challenges with innovative technology that defines industry standards.

A Leader in Thermowell Reliability

For over 20 years, Emerson has been a leader in delivering thermowell reliability and application flexibility. Through our Rosemount Thermowell Design Accelerator, performing Wake Frequency Calculations is fast, easy, and yields the most reliable thermowell solution for your application. Our thermowell calculations are performed in accordance with the ASME PTC 19.3 TW standard, which helps ensure your thermowells are safe and avoid unforeseen downtime. Our thermowell portfolio consists of various process connections, materials, and styles, and can meet your desired specifications.

Free Calculation Tool

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Thermowells Overview

Thermowells (1) are closed-end metal tubes installed pressure-tight into process vessels or piping, protecting temperature sensors (2) from harsh industrial process conditions, such as flow-induced stress, high pressure and corrosive chemicals. Additionally, thermowells allow the sensor to be easily removed from the process for calibration or replacement without requiring a process shutdown. Based on the stem profile, you can optimize your thermowells for response time or robustness. For the most accurate temperature measurement, size your thermowell to place the tip in the center of the pipe.

Thermowell Overview Diagram Image with Sensor

Welded (1):

Used for high flow rates, pressures and temperatures

Flanged (2):

Used for high pressure/high flow rate processes

Threaded (3):

Most common, easiest installation, threaded into port on process

Van Stone (4):

Two-piece design, ideal for corrosive applications requiring exotic metal thermowells

Stepped (1):

Best thermal response time
Least robust profile
Produces lowest drag force

Tapered (2):

Good thermal response time
Good strength
Produces high drag force

Straight (3):

Slowest thermal response time
Most robust profile
Produces highest drag force

Twisted (4):

Patented Rosemount design
Used in high velocity and high accuracy control applications
Most robust thermowell design that allows for proper stem immersion in the pipe
Best results when it comes to suppressing harmful vortex shedding induced vibrations

Thermowell Solutions

A robust and versitle thermowell family‑‑precision manufactured in a wide variety of mounting styles, process connections, and materials for adaptability and compatibility.

Design flexibility allows you modify the thermowell profile to fit exact needs
Large variety of standardized thermowell tests and certificates for traceability and safety
Access to thermowell calculation tool (according to ASME PTC 19.3TW-2016) to ensure thermowell is safe in selected process conditions
Global models available around the world

A New Twist on Thermowell Design

Save money and engineering time while increasing safety
Eliminates over 90% of dynamic stress
No wake frequency or dynamic stress calculations
Greatly reduces the risk of thermowell failures with changing process conditions (start-up, shutdown, events)

See the Thermowell Comparison Video for an inside look at the life of a thermowell. For more information on the Rosemount Twisted Square thermowell visit our product page.

Typically used in the chemical and pharmaceutical industries and designed to allow for a fast time response or for applications where long immersion lengths are needed.

Threaded and flanged mounting styles with stem profile options allow for application flexibility
Special testing options to meet process requirements, including external and internal hydrostatic pressure testing and dye penetration

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