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Method of detecting occlusions in a solution pumping system

  • US 5,292,306 A
  • Filed: 01/29/1993
  • Issued: 03/08/1994
  • Est. Priority Date: 01/29/1993
  • Status: Expired due to Term
First Claim
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1. A method of operating a solution pumping system including pump means which creates a positive liquid pressure at said pump means during a pumping stroke, and a negative liquid pressure at said pump means during a return stroke, said method comprising the steps of:

  • determining a pressure P1 during a pumping stroke of said pump means corresponding to a peak pressure of said system;

    waiting a predetermined time interval TA after determination of said pressure P1 ;

    determining a pressure P2 corresponding to the pressure of said system; and

    providing a signal indicating occlusion of said system downstream of said pump means if P2 exceeds a predetermined value.

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