Automatic liquid level monitor

摘要

Apparatus for determining the location of the liquid level in a well or borehole. A source of acoustic pressure pulses is coupled to the surface casing 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. A digital readout device is used to indicate the depth to the liquid level in the well. The acoustic pulse source is automatically actuated at predetermined times, and the depth to the liquid level and the time are automatically recorded. This produces a record of time and liquid depth which can extend over a period of several days.