Method for monitoring fluid flow from a volumetric pump

Details Method for monitoring fluid flow from a volumetric pump Method for monitoring fluid flow from a volumetric pump

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 49/06 (2006.01) F04B 43/08 (2006.01)

Patent

CA 2113473

2113473 9304285 PCTABS00020 A method for determining if fluid is being displaced by a volumetric pump. During a pumping segment of a pumping cycle for the volumetric pump, an outlet cracking valve (52) compresses the flexible tubing until the pressure of the fluid displaced by the plunger exceeds a cracking pressure, at which time the outlet cracking valve opens to enable fluid flow. A cracking flexure (182) provides the cracking force. A flow detector (54) mounted to the cracking flexure responds to the stress generated in the cracking flexure thereby, producing a signal indicative of fluid flow from the volumetric pump. The flow detector also provides an indication when a source of liquid (31) for the volumetric pump has run dry. The method comprises the steps of processing the signal to determine if it exceeds a predefined threshold that varies as a function of the rate at which the pump is set to deliver fluid.

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