Sheathed thermocouples differ from conventional thermocouples in their smaller construction and their flexibility. Due to this feature, sheathed thermocouples can also be used in places that are difficult to access.
In our extensive range of sheathed thermocouples, you can find a suitable version for every application.
For sheath materials, Alloy 600 or stainless steel are used preferentially. Alloy 600 (2.4816 Ni alloy) is the standard material for applications which require specific corrosion-resistant properties under exposure to high temperatures, resistant to induced stress corrosion cracking and pitting in media containing chloride. Sheathed thermocouples from Alloy 600 are resistant against halogens, chlorine, hydrogen chloride and ammonia in aqueous solutions. Sheathed thermocouples from 316 stainless steel feature good resistance against aggressive media and also against vapour and combustion gases in chemical media.
The information on the use of sheathed thermocouples refers to versions with direct contact to the medium.
We recommend that you clarify the temperature range, accuracy classes and dimensions of these "noble" PtRh-Pt (platinum/rhodium-platinum) mineral-insulated thermocouples with your responsible contact person.
One differentiates between insulated and non-insulated measuring points. In the case of insulated measuring points, the measuring point is not connected to the outer sheath (ungrounded measuring points), while in the case of non-insulated measuring points it is welded to the outer sheath (grounded measuring points). Insulated measuring points make the sensor somewhat more slow-acting thermally, but also less sensitive to interference during signal transmission. Sheathed thermocouples with grounded measuring points have a very fast response time, but are much more sensitive in terms of signal transmission.