Selection of temperature sensing elements for corrosive environments
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The medium under test is a NaCl solution; both the platinum resistor and the bimetallic thermometer are made of 316L material. During operation, some instances of fracture and corrosion were observed! Currently, a PTFE jacket and a conical protective tube are used, along with a short insertion depth as much as possible; this needs to be verified! Does anyone have any good ideas!
This post was last edited by leit on 2015-8-6 09:52. A metal sleeve is not necessary; corundum and ceramic sleeves are recommended. PTFE has no problem with corrosion resistance, but its wear resistance is questionable; reducing the insertion depth will lead to errors.
PTFE is likely to be the most cost-effective solution； The only small drawback is that it’s not non-metallic, and its response time is slightly poor
Austenitic stainless steels are susceptible to stress corrosion, pitting corrosion, and intergranular corrosion in chloride environments.
For NaCl solutions, if metal materials are to be used, Duplex Stainless Steel is usually the preferred choice. Hastelloy and Monel alloy are also options available.