| 摘要 |
<p>A water softening system (10) is provided in which a determination is made whether the slow rinse cycle of a regeneration has been completed or abnormal. A reference cell (Rr) and a spaced sensing cell (Rs) are provided in a water tank (12). Reference cell (Rr) and spaced sensing cell (Rs) carried by probe (27) are connected via lines (30, 31 and 32) to pins (1, 2 and 3) of plug (34). The impedance difference of the solution between the reference cell (Rr) and the sensor cell (Rs) is sensed. If the impedance difference is a first state, then after a predetermined period of time a determination is made if the impedance difference is a second state. If the impedance difference is a second state, then after a predetermined period of time a determination is made if the impedance difference is a third state, this indicates that the sodium ion concentration is uniformly reduced in the zone between the reference cell (Rr) and the sensing cell (Rs) and that the slow rinse cycle has been completed.</p> |
