Broadly speaking, there are three types of platinum-rhodium S-type thermocouple wires: B, S and R types. The suitable temperature range of R type and S type is 1398 ~ 1482°C (2550 ~ 2700°F); Type B is suitable for continuous use at temperatures up to 1704°C (3100°F). Even if it is strictly controlled within the time range, oxidation and corrosion will inevitably occur. So in order to effectively prevent oxidation and corrosion under high temperature conditions, we provide high-quality non-insulated temperature measuring wires that can be applied to 3 types of 'noble metal' thermocouples:, Type B: platinum 6% rhodium (-) and platinum 30% rhodium (+); Second, S type: platinum (-) and platinum 10% rhodium (+); third, R type: platinum (-) and platinum 13% rhodium (+); platinum rhodium S-type thermocouple wire R Types and S are recommended for continuous use in an oxidizing or inert atmosphere with a temperature of up to 1398°C (2550°F), or short-term exposure to use at a high temperature of 1482°C (2700°F). Type B is suitable for continuous use in an oxidizing or inert atmosphere with a temperature up to 1704°C (3100°F). When working close to a large temperature, it is recommended to use a larger wire diameter. All 3 types of thermocouples mentioned above can be used in a vacuum environment for a short time. When used in a vacuum environment, Type B provides very good stability. The three models are not suitable for use in reducing gases or environments containing metal or non-metal vapors, unless non-metal protective sleeves are used. One more thing to keep in mind is: never insert the thermocouple directly into the metal protective sleeve.
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