| 摘要 |
An electrically heated continuous flow heater control system includes an electric switching element that has an open and a closed switching position and is electrically connected in series to a thermostat. Switching element (26) is always closed in the brewing process while it can be opened and closed again in the keep-warm process by a control circuit. The control circuit includes a temperature sensor which is in good heat contact with the infusion beverage. When in the initial phase of the keep-warm process the sensor temperature is in excess of a definable switching temperature, the control circuit keeps the switching element in its open position for as long as the sensor temperature remains higher than the switching temperature in the course of the consequently occurring cooling of the infusion beverage. When the sensor temperature is below or equal to the temperature of the switching element in the keep-warm process, the control circuit keeps the switching element in its closed position for a predefinable first time interval (heating cycle) irrespective of the sensor temperatures produced during the heating cycle.
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