Product Name: 95%/99% Alumina Ceramic Insulator for Type K Thermocouple
Product Material: High-Purity Alumina ($Al_2O_3$), typically 95% for standard industrial use or 99% for high-precision laboratory environments.
Material Characteristics: Excellent electrical resistivity at high temperatures, High mechanical strength, Good thermal shock resistance, Chemically inert to Nickel-Chromium and Nickel-Silicon alloys, Service temperature up to $1600^{\circ}C$ (exceeding the limit of Type K wires).
Standard Configurations: Single-bore, Twin-bore (most common for Type K), and Four-bore (for duplex thermocouples).
Application Fields: Industrial heat treatment furnaces, HVAC temperature monitoring, Kiln temperature control, Plastic injection molding sensors, Food processing ovens, Laboratory muffle furnaces.
Application Industries: Biomedical (Incubator sensors), Advanced Machinery (Smelting and casting), New Energy (Battery aging test chambers), Fluid Control (High-temp steam monitoring), Electronic Engineering (Burn-in test equipment), Aerospace (Thermal testing rigs).
Processing Difficulties: Maintaining consistent inner diameter (ID) tolerances for smooth insertion of 0.5mm to 3.2mm thermocouple wires, Ensuring straightness in long tubes to avoid mechanical stress on the ceramic, Preventing cross-contamination during production to ensure zero impact on sensor calibration.
Processing Flow: Powder formulation → High-pressure Extrusion → Precision air-straightening → High-temperature sintering → Diamond cutting to custom lengths → Deburring and cleaning → Insulation resistance verification → Protective packaging.
Delivery Period: Standard specifications: 7-12 days,
Our Ceramic Insulators for Type K Thermocouples are engineered to provide reliable electrical isolation for Nickel-Chromium and Nickel-Silicon wire pairs. By utilizing high-density Alumina, these insulators prevent "shunting" (leakage current between wires) which can lead to false temperature readings. The smooth internal surface allows for effortless threading of wires, while the high thermal conductivity ensures that the thermocouple responds rapidly to temperature fluctuations. Designed to withstand the typical $1000^{\circ}C - 1200^{\circ}C$ operating range of K-type sensors, these ceramic cores provide a robust, non-reactive barrier that extends the life of your sensors in oxidizing atmospheres.
Key Features:
Calibration Stability: High purity prevents metallic ions from migrating into the thermocouple wire, ensuring accurate readings over time.
Superior Insulation: Maintains high Ohm resistance even at the $1200^{\circ}C$ peak range of Type K sensors.
Thermal Response: Thin-wall multi-bore design allows for fast heat transfer to the sensing junction.
Mechanical Protection: Shields fragile thermocouple wires from physical damage and vibration within the thermowell.
Cost-Effective: 95% Alumina grade provides excellent performance-to-cost ratio for standard industrial K-type applications.
