Disposable thermocouples are primarily used for short-term high-temperature measurements, commonly found in industries such as metallurgy and casting. Their structure is simple and typically consists of the following components:
1. Thermocouple Wires
Material: The positive wire is often made of platinum-rhodium alloy (e.g., Pt-Rh10), while the negative wire is made of pure platinum (Pt).
Function: Generates a thermoelectric voltage through the Seebeck effect to measure temperature.
2. Insulation Tube
Material: Ceramic or quartz.
Function: Isolates the positive and negative wires to prevent short circuits and protects the thermocouple wires.
3. Protective Sheath
Material: High-temperature-resistant materials such as ceramic or metal.
Function: Protects the internal components from harsh environments and mechanical damage.
4. Connecting Wires
Material: High-temperature-resistant wires.
Function: Connects the thermocouple to the measuring instrument.
5. Terminal Block
Material: High-temperature-resistant insulation materials.
Function: Secures the connection between the thermocouple wires and the connecting wires.
Disposable thermocouples are designed for single-use applications, offering convenience and accuracy in high-temperature environments.
