Method and device for detecting blocked condition in a tube of a

Details Method and device for detecting blocked condition in a tube of a Method and device for detecting blocked condition in a tube of a

1990-03-15

1990-12-11

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

73728, 336 30, G01L 910

Patent

active

049761510

ABSTRACT:
A detector for a blocked condition in a tube of a liquid infusion pump includes a moveable shaft which is kept in contact with the outer wall of a flexible tube for transporting a liquid therethrough and moves according to the changes in the outer diameter of the tube corresponding to changes in the internal pressure of the liquid. A magnet core is affixed to this shaft and affects the inductance of a solenoid coil which is affixed at a fixed position. A blocked condition in the tube is detected by monitoring the change in the inductance of this coil.

REFERENCES:
patent: 3698249 (1972-10-01), Weaver
patent: 4702675 (1987-10-01), Aldrovandi

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