Hard water fur indicator for electric coffee maker - has temp. sensor and timer providing signal when max. temp. is attained before set time

摘要

The required amount of water for the coffee making machine, and the boiling time are adjustable. The coffee making machine includes a heating element (6) mounted in the bottom of the water boiling chamber (19). There is an adjacent temperature limiting device (7). When the maximum permissible temp. is attained before the end of the time set according to the times (20) a warning device is actuated. This indicates that some furring of the boilding chamber has occurred.