The temperature sensors commonly used in furnace temperature testers are mainly thermocouples, with thermal resistors applied in a small number of low-temperature and high-precision scenarios. Details of sensor types and advantages of K-type thermocouples are as follows:
I. Common Types of Temperature Sensors for Furnace Temperature Testers
- Thermocouples (Mainstream Selection)
- K-Type (Nickel-Chromium/Nickel-Silicon): The most widely used general-purpose thermocouple, suitable for most medium-to-high temperature industrial furnace temperature testing scenarios.
- S-Type (Platinum-Rhodium₁₀/Platinum): A precious metal thermocouple featuring high temperature resistance and high precision, ideal for harsh working conditions such as metallurgy and ceramic sintering.
- B-Type (Platinum-Rhodium₃₀/Platinum-Rhodium₆): A thermocouple dedicated to ultra-high temperature applications, capable of withstanding an extreme temperature of 1800℃, used in glass melting and special metal smelting.
- J-Type (Iron/Constantan): Demonstrates excellent stability in reducing atmospheres, suitable for environments like vacuum furnaces and hydrogen furnaces.
- Thermal Resistors (Minor Supplementary Option)
- Represented by PT100, it is only applicable to low-temperature and high-precision scenarios ranging from -200℃ to 650℃. It offers higher precision than thermocouples but has poor high-temperature resistance, making it unsuitable for high-temperature furnace applications.
II. Core Advantages of K-Type Thermocouples
- Wide Temperature Measurement RangeCovering from -200℃ to 1300℃, it can meet the requirements of most industrial furnace temperature testing scenarios, such as electronic welding, coating curing, plastic molding, and hardware heat treatment.
- High Cost-EffectivenessMade of ordinary metal materials including nickel-chromium and nickel-silicon, it has much lower production costs compared with precious metal thermocouples like S-type and B-type, making it suitable for large-scale industrial applications.
- Stable PerformanceIt features good linearity, with an accurate correspondence between thermoelectric potential and temperature, ensuring highly repeatable test data. It also has excellent oxidation resistance and a long service life in oxidizing atmospheres.
- Easy to UseThe probe has flexible forms and can be made into thin and flexible styles, which can fit into narrow spaces inside furnaces and facilitate temperature measurement synchronously with workpieces.
