Industrial temperature sensor calibration equipment

Thermowells / protection tubes

Installing a thermowell (thermometer protection sleeve) extends the service life of the thermometer and prevents the sensor probe from corrosion. Once a thermowell is installed on mechanical equipment, the thermometer can be replaced without shutting down the system, eliminating the risk of medium leakage and ensuring an uninterrupted production process.
Thermowells are widely used in chemical processing, industrial equipment, plant engineering, and the petrochemical industry. If you have any requirements for thermowells, accessories, or technical inquiries, please feel free to Contact Us. SJ Gauge is dedicated to providing you with professional and tailored solutions.

Thermowells and Protection Tubes FAQ

Questions for threaded, flanged, and solid bar stock thermowells used to protect temperature instruments.

Why is a thermowell used?
A thermowell protects thermometers and temperature sensors from pressure, corrosion, flow, vibration, and mechanical damage. It also allows replacement or maintenance without draining or shutting down the process.
How do I choose threaded, flanged, or solid bar stock thermowells?
Threaded thermowells are common for smaller process connections, flanged thermowells are used for higher-load piping or vessels, and solid bar stock designs are selected for stronger mechanical and chemical resistance.
Can thermowells be used with thermocouples and RTDs?
Yes. Thermowells can be paired with bimetal thermometers, temperature gauges, thermocouples, and RTDs. The bore size, insertion length, process connection, and sensor diameter must be matched.
What should be checked before ordering a thermowell?
Confirm process connection, insertion length, stem diameter, material, pressure, temperature, media compatibility, and whether flow-induced vibration needs to be reviewed.