Automatic liquid level controller

Details Automatic liquid level controller Automatic liquid level controller

1981-06-24

1983-06-21

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

73151, F04B 4906

Patent

active

043891640

ABSTRACT:
A source of acoustic pressure pulses is coupled to the surface casing of a well so that they are transmitted down the well and reflected by the gas-liquid interface. A transducer is also coupled to the well to produce an electrical signal in response to direct and reflected acoustic pulses occurring in the well. Gating circuitry responds to the transducer for starting and stopping the counting of clock pulses by a digital counter. The digital count controls a pump so that the liquid level in the well is precisely controlled between desired levels.

REFERENCES:
patent: 3817094 (1974-06-01), Montgomery et al.
patent: 3938910 (1976-02-01), Douglas
patent: 3965983 (1976-06-01), Watson
patent: 3985030 (1976-10-01), Charlton
patent: 3991611 (1976-11-01), Marshall et al.
patent: 4121094 (1978-10-01), Di Vito

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