NTC Temperature Sensor for Smart Toilet Water Temperature Control

With the development of technology, products are becoming more user friendly and smart, so are smart toilets. There are multiple functions of smart toilets, for example, seat heating, warm water flushing, warm air drying, automatic cleaning, automatic deodorization, etc. For the first function, smart toilets complete user’s hygienic clean in a gentlest way, a constant water temperature is required within a safe range. Therefore, a built-in NTC temperature sensor is needed for the smart toilets to control the water temperature.

The smart toilet water temperature heating device is composed of a water inlet and outlet mechanism, an instant heating mechanism, a control mechanism and a power supply mechanism. The water outlet mechanism has a connecting pipe No.1, an NTC temperature sensor, a water channel switching assembly, a water outlet assembly No.1, and a water outlet assembly No.2. The NTC temperature sensor is installed at the water outlet of connecting pipe No.1 to detect the water temperature, and the water outlet of the water circuit switching component is respectively connected with a water outlet assembly No.1 and water outlet assembly No.2; the control mechanism includes MCU and PID controller, and the water inlet mechanism , instant heating mechanism, power supply mechanism, waterway switching component, PID controller and NTC temperature sensor are all connected to MCU, and NTC temperature sensor is also connected to PID controller, which is used to control water temperature.

The smart toilet water temperature heating device operates in the circulation mode, which can predict the heat accumulation during the water channel switching process. When it is at a hygienic mode, the water temperature matches the set water temperature, to ensure the temperature is within the safe range. In each mode, water temperature is within control by PID closed-loop, to avoid overheat.

The NTC temperature sensors for smart toilet water heating devices is usually potted in bullet shaped housings, with high-precision glass-encapsulated thermistors. The advantages are waterproof,  fast thermal response time (up to 0.5S),  stable performance, and high reliability.