Product Variation:


Custom Thermowells

In addition to our standard Thermowells, Marsh Instruments offers custom Thermowells. Configurations include, but are not limited to flanged, weld-in, sanitary/clamp-in, and more. Marsh Instruments Thermowells can be offered in custom sizes, lengths, bore diameters, and shank configurations as well as a variety of materials to ensure chemical compatibility with corrosive media. Marsh Instruments Thermowells can also be provided with test certificates including material certification, wake frequency test, hydrostatic tests, and more.

Download Spec Sheet & Literature

View Thermowell Spec Sheet 1
View Thermowell Spec Sheet 2
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  • Industrial
  • Oil & Gas
  • Chemical/Petrochemical
  • HVAC
  • Commercial

Additional information


Material Test Report, Hydrostatic Test Report, Wake Frequency Calculation, Stainless Steel Tag, Custom Marking

Stem Length

2.5" through 24", custom (contact factory)


Custom Thermowells

Insertion Length

custom (contact factory)

Instrument connection

1/2" FNPT, Custom (contact factory)

Process connection

custom (contact factory)


Stepped, Straight, Tapered


Brass, 304 Stainless Steel, 316 Stainless Steel, Hastelloy C276, Tantalum, Custom (contact factory)