Regeneration sensing device

摘要

The disclosure herein describes an apparatus for determining the state of water softening material and water in a water softening tank with a view to determining when regeneration of the water softening material is needed. Top and bottom primary sets of electrically conductive probes are used at a predetermined distance, one above the other within the water softening material, the probes facing into the water softening material and water. Top and bottom secondary sets of electrically conductive probes are also used at a predetermined distance above one another within the softening material, the probes of the secondary sets being exposed to water only. The probes of the top primary set are disposed next to the probes of the top secondary set while the probes of the bottom primary set are disposed adjacent the probes of the bottom secondary set. When the resistances or measurements of the probes of the secondary sets are substantially equal to one another, the probes of the top primary set are defined as a standard against which the probes on the bottom primary set are compared for determining when regeneration is needed.