Coating-responsive condition monitoring system

Details Coating-responsive condition monitoring system Coating-responsive condition monitoring system

G - Physics

01

F

324/45

G01F 23/26 (2006.01) G01B 7/06 (2006.01) G01N 27/02 (2006.01)

Patent

CA 1338881

A multiple set point material condition monitoring system is disclosed which is responsive both to the level of material with respect to a sensor and the extent of material coating which has accumulated on the sensor. The system provides an output when a predetermined coating thickness has been exceeded, so that the sensor may be cleaned before the coating can accumulate to the extent where a false level output is generated. The disclosed systems include three electrode guarded sensors, a bridge comparing the sensor output with a reference, and a bridge reference which is automatically and repeatedly caused to assume a sequence of values corresponding to material condition set points, one of which causes an output when a predetermined coating thickness has occurred and another of which generates a level output. In one embodiment, separate outputs are provided corresponding to each set point. In another embodiment, a single tri-state output is responsive to both set points.

609418

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