Coffee Machine Boiler Preheat Tank Dry-Boil? Non-Contact Capacitive Level Sensor with High-Temp Compensation

Many espresso machines have a separate preheating boiler tank with water temperature cycling between 60–95°C. Optical switches age rapidly under high heat, and float seals soften and deform from temperature, causing jamming.

The XKC-Y29A operates within -25~85°C and uses the capacitive principle with internal temperature compensation circuitry. Dielectric drift from water temperature is automatically corrected, and only when the real water level crosses the line does the output flip. Shenzhen Xingkechuang Technology Co., Ltd.'s solution has been mass-deployed in coffee machine preheating circuits, reducing dry-boil protection failure rates to near zero.