Selection of Coffee Machine Temperature Control Solution, NTC Temperature Sensor Layout and Monitoring

The extraction process of a coffee machine is highly sensitive to water temperature. Any deviation in water temperature may result in insufficient or excessive extraction, directly affecting the dissolution balance of coffee. To achieve precise temperature control, most coffee machines on the market use multiple EXSENSE excellent-reliability NTC temperature sensors as core temperature measurement components, sensing water temperature changes in real time while monitoring the junction temperature of other internal components, providing users with a more stable user experience.

The installation positions of the EXSENSE coffee machine NTC temperature sensors usually cover the following key points, working together to ensure efficient operation of the coffee machine and high-quality coffee production:

1. Heating Coil/Heating Plate: The NTC temperature sensor is placed close to the heating coil/heating plate. When current passes through and raises the temperature, the NTC resistance value drops rapidly with temperature changes, and this change is transmitted to the control system in the form of an electrical signal. The system determines based on a preset temperature threshold. If the temperature exceeds the target value, it sends a command to reduce the heating power; if not, it increases the power to ensure heating efficiency and safety.

2. Water Outlet: When the heated water flows out through the outlet, the EXSENSE temperature sensor immediately senses the water temperature, acting as if a temperature threshold is set for the water flow. Once the water temperature deviates from the ideal brewing range, the NTC quickly transmits the temperature deviation signal to the control system, which then adjusts the operating state of heating element to quickly return the water temperature to normal, ensuring the coffee extraction temperature is appropriate.

3. Steam Nozzle: Monitors steam temperature so that the steam during the milk foam process reaches an appropriate temperature, resulting in delicate and dense milk foam that enhances the taste and quality of coffee.

The multi-point layout strategy enables EXSENSE coffee machine NTC temperature sensors to build a complete temperature feedback chain in the water system and heat-processed components, providing precise temperature data for the coffee machine control system and serving as essential components for closed-loop temperature control. This process relies on the excellent electrical performance of the NTC:

1. Excellent reliability: EXSENSE temperature sensor is encapsulated in a 304/316 stainless steel housing, meeting IP68 waterproof requirement. During long-term frequent use of the coffee machine, it can operate smoothly and consistently, ensuring consistent temperature control and reducing the risk of equipment damage.

2. High Accuracy: The resistance value and Beta accuracy of coffee machine NTC can reach ±1%, accurately obtaining water temperature to stabilize the extraction range, effectively releasing the aroma and flavor of the coffee, meeting the differentiated water temperature requirements of coffee beans with different roast levels.