E - Fixed Constructions – 04 – H
Patent
E - Fixed Constructions
04
H
341/34
E04H 3/16 (2006.01) G05D 9/12 (2006.01)
Patent
CA 1167136
O. A. Lively CONTROL CIRCUITRY FOR WATER LEVEL CONTROL OF POOLS Abstract of the Disclosure Circuitry for automatically controlling the water level of swimming pools with a multi-level detecting sensor for directly sensing the pool water. A low voltage oscillator in the input portion-of the circuitry detects the presence of water above or below each level sensing electrical contact of the sensor by a change in oscillator amplitude in response to impedance from the contact to ground. Signal threshold circuitry changes in output signal in response to the amplitude of the oscillator signal. Delay circuitry integrates the output of the threshold signal to avoid responding to spurious changes in water level, such as wave action in the pool. Monitor circuitry disposed between the delay circuitry and the water fill, water dump, and pump control circuitry monitors signals received from the sensor or generated by the input circuitry to detect any malfunctions in the sensor or the control circuitry, such as improper sequence of the water level signals, to disable further filling of the pool. Bi-stable switch circuitry controls filling of the pool and is responsive to differing pool levels to cause filling of the pool to commence or to stop.
367375
Lively Olin A.
Osler Hoskin & Harcourt Llp
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