Thermowells

Some sensors can be fitted directly into the process by means of an integral process connection or by using an appropriate compression fitting. Other applications require a pocket or thermowell which is a permanent fitting into the process yet allows the sensor to be inserted or removed without interruption.

Pockets invariably increase the response time and obviously the thicker and heavier the pocket the more the response time will be increased. Some styles use spring loading which keeps the inset in permanent contact with the pocket. However, it is the radial clearance between the inset and pocket which has the greatest influence on response time.

For improved response the inset should be assembled into the pocket using thermally conductive grease. The following illustrations show the most popular styles of pockets/thermowells.  

STW 1 - Thermowell

All welded 316 ST/STEEL construction for screw fitting into process connection, suitable for STS sensors Style 1 and 9.

Specify the parameters you require from the diagram below.

STW 2 - Thermowell

All welded 316 ST/STEEL construction with brass compression gland, suitable for style 2 and 4.

STW 3 - Weld In Thermowell

All welded 316 ST/STEEL construction "weld-in" pocket, suitable for Style 1,9 and 2, 4  temperature probes with a compression gland. Please contact our sales office for full details.

STW 4 - Solid Turned (For Strength) Thermowell

Solid turned 316 ST/STEEL construction sensor for screw fitting into process connection, suitable for Style 1 and 9 sensors.

STW 5 - Fabricated Flanged Thermowell

All welded 316 ST/STEEL construction for bolting to a flanged process connection. Due to the wide variety of, dimensional, material, pressure and pipe size requirements, all thermowells of this style are manufactured to your specifications. Please contact us to discuss your exact requirements.

STW 6 - Solid Turned (For Strength) Flanged Thermowell