Boots – shoes – and leggings
Patent
1994-03-10
1996-07-23
Zanelli, Michael
Boots, shoes, and leggings
364509, 364563, 324648, 73304R, 340612, G01F 2326
Patent
active
055396704
ABSTRACT:
A multiple set point material condition monitoring system 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 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.
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Kramer L. Jonathan
Maltby Frederick L.
Petersen Steven R.
Drexelbrook Controls, Inc.
Zanelli Michael
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