| 摘要 |
A water softener sensor control transmits the output of a motor in response to hardness of periodic water samples. The motor drives a timing gear that periodically actuates a control assembly to slide a cam member to open a valve in a resin containing chamber to admit a water sample, and to drop a plunger on the resin to detect its volume. If the water is hard, the resin shrinks and a latch in the plunger actuates an output assembly driven through a gear train by the motor to rotate an output shaft. This control also includes means for varying the level from which water samples are taken, and several novel mechanisms disclosed in detail.
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