How to choose the material of bimetallic thermometer?

Bimetallic thermometer is commonly used in industrial equipment, considering the accuracy and cost performance, we usually choose stainless steel material, and the material of common bimetallic thermometer can be divided into two SS316 and SS304 stainless steel. They are on the chemical composition of the main difference is that 316 molybdenum ( Mo） , and generally recognized, SS316 than SS304 more resistant to corrosion in the chemical solution. So using bimetallic thermometer in the chemical industry, engineers generally choose sheath maerial of SS316 material. But no absolute, the so-called things in sulfuric acid environment, also cannot use SS316! Because the SS316 material will have a chemical reaction and sulfur. Thus, there is no any kind of stainless steel is the super invincible corrosion resistance. Actually, the stainless steel is a piece of impurities, but these impurities compared to other more corrosion resistant steel. Than SS316 and SS304 steel content is high, easy and other physical reaction. So, we should know the use of the bimetallic thermometer environment, according to need to choose a suitable material.