I love that we do this question:

It seems unimportant but there are many aspects to consider, WIKA is an expert in performing mechanical sheaths for RTD's, both standard jobs to work cyclic fatigue in aggressive media, both corrosion and abrasion as speeds high fluid derived from a medium nearby stirring. Down here I leave the relevant links. But there are alternative designs and to stop a train. If you need more information you should be more specific in the application. (Application type, or nature of the fluid medium, such loads shall be subject to, temperature ranges ...).

Sheaths

[link Point to another website Only the registered members can access]
RTD's

[link Point to another website Only the registered members can access]

Good Luck...