Pumps – Condition responsive control of pump drive motor – Responsive to accumulation of pumped liquid in receiver
Patent
1975-10-06
1977-12-06
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
Responsive to accumulation of pumped liquid in receiver
62188, 137392, 340244C, F04B 4900, F25D 1702, G08B 2100
Patent
active
040614425
ABSTRACT:
The specification discloses a technique for controlling a pump to maintain a body of liquid below a maximum liquid level. A low voltage high frequency signal is applied to a conductive first probe which extends to a desired maximum liquid level. The high frequency signal is also applied to an electronic detector and switching circuit in order to maintain the switching circuit in a first state when the liquid level does not contact the first probe. The effect of the application of the high frequency signal to the switching circuit is reduced when the liquid level contacts the first probe, thereby changing the switching circuit to a second state. A pump is then energized to lower the liquid level in response to the second state of the switching circuit. A second probe is then coupled to receive the high frequency signal. The second probe extends to a lower level than does the first probe, thereby maintaining the pump in an energized state until the liquid level falls below the second probe. A safety overflow probe and circuitry is provided to prevent overflow in case of malfunction of the system.
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Fisher et al. Publication, A Liquid Nitrogen Level Regulation, 6/1972, Published by Cryogenics, p. 240 of June 1972 issue.
Clark Anthony W.
Stubbs, Jr. Rex G.
Beckett Corporation
Freeh William L.
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