Thermocouple selection
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The protective sleeves of the thermocouples installed at the lower parts of the atmospheric pressure column and vacuum column leak due to corrosion and erosion during the production process; this is especially true in the feed section. Those of you who have experience in this area, what model of thermocouples do you choose?
Use a protective sleeve made of 316L material.
Wear-resistant thermocouples are available, and samples in this regard are present. But the price is a bit higher
I wonder what medium is inside the tower? In our company’s distillation towers, hydrofluoric acid is used, and the thermometer sleeves are made of Hastelloy
If a protective sleeve is to be used, when selecting a thermocouple, it is more important to consider your temperature range requirements and the response speed to temperature changes. Of course, the protective sleeve needs to be determined based on the medium and temperature inside your tower. Also, during installation, it is necessary to avoid placing it in areas with severe erosion, of course, as long as the temperature measurement requirements are met
It mainly depends on the conditions of the medium inside the tower, as well as parameters such as pressure and temperature
Its corrosivity and wear resistance determine the material of the casing