1.Working Principle Built-in negative temperature coefficient NTC thermistor: Temperature rises → resistance decreases; Temperature drops → resistance rises. The main control board converts resistance signals into temperature values to automatically switch heating tubes on/off and stabilize baking temperature. 2. Standard Technical Parameters Nominal resistance R25: 50KΩ / 100KΩ B-value: 3990K, 4100K, 4200K Temperature accuracy: ±1℃ ~ ±2℃ Long-term operating temperature: -40℃ ~ 300℃ Anti-high temperature oxidation, resistant to oil fume and baking steam 3. Product Structure Glass sealed high-temperature NTC chip (stable with no resistance drift under long high heat) Stainless steel metal probe (304/316 food grade, anti-rust, good thermal conductivity) High temperature resistant braided silicone wire (heat resistance up to 300℃) High temperature insulation protective sleeve Fixed mounting bracket / thread for oven installation Custom terminal connectors for PCB assembly 4. Core Functions Constant baking temperature control Maintain accurate set temperature for cakes, bread, meat baking to avoid undercooking or burnt food. Multi-mode temperature matching Adapt to fermentation, roasting, air frying, steaming multiple working temperature ranges. Overheat safety cut-off protection When cavity temperature exceeds safe limit, automatically cut off heating power to prevent fire risk. Real-time temperature display on control panel 5. Common Fault Symptoms Oven cannot reach set temperature or overheats severely Temperature display value is obviously inaccurate Oven stops heating automatically during baking Unable to switch temperature gears normally 6. Application Range Household electric ovens, steam ovens, air fryer ovens, built-in integrated ovens, commercial bakery ovens