Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1984-06-07
1986-07-15
Pellinen, A. D.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
340620, 361178, 137392, H01H 3518
Patent
active
046008446
ABSTRACT:
A circuit for controlling the level of a liquid in a tank between predetermined limits is disclosed. A low and high probe are provided, each connected in the tank at the desired limit levels, and each connected to a comparator associated therewith. The output of each of the comparators are connected as inputs to an OR gate, which provides the control signal for activating a pump to pump liquid from the tank, and further provides a latching signal to the lower limit comparator, to keep that comparator latched in an off position until the upper limit comparator is triggered by liquid coming into contact with the upper limit probe. Once activated, the upper limit comparator causes the OR gate to produce a pump activation signal, in addition to unlatching the lower limit comparator, which in turn produces an OR gate activating signal which remains set until the pump evacuates the tank below the level of the lower limit probe, thereby deactivating the OR gate and the pump and whereby the process may be reinitiated.
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DeBoer T.
Pellinen A. D.
The Marley-Wylain Company
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