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Condensate Removal Pump Controller Using Acoustic Liquid Level Sensor

  • US 20110091330A1
  • Filed: 10/21/2009
  • Published: 04/21/2011
  • Est. Priority Date: 10/21/2009
  • Status: Abandoned Application
First Claim
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1. A pump controller for controlling the operation of a condensate removal pump which removed liquid condensate in an air conditioning/refrigeration system, comprising:

  • an acoustic transmitter/receiver for transmitting an acoustic signal towards a liquid disposed in a container from above the liquid level, for receiving the reflected acoustic signal reflected by the liquid, and for producing a signal indicating the transit time of the acoustic signal;

    a comparator which compares the transit time signal to a first reference value, and a second reference value and which produces a pump-on signal when the transit time signal is below a first reference level, and produces a pump-off signal when the liquid level signal exceeds the second reference level; and

    a pump in a condensate reservoir which is connected to receive the pump-on and pump-off signals, and switch on and off, respectively, in response thereto, to remove the condensate liquid in the reservoirs.

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