Water bearing electrical appliance with a heating device

摘要

An electric heater (12) for water flowing in a pipe includes a water conductivity sensor (14) that protrudes through the pipe into the water current. The sensor can be fitted into the same mounting (18) as the heating element (16) or can have its own mounting when the heating element is wound round the pipe. Preferably two sensing elements (40) are used, with connections (36) through the sealed (24) mounting (18). The sensor is preferably mounted vertically in a unitary locating fitting that prevents rotation. The evaluation unit for the sensor signals provides a correction for the conductivity values which takes into account the higher water temperature in the vicinity of the heater.